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Real Life Testimonials!

LCD Monitor Problem Solved!

Hi Jestine,
 
I just found your website last night and this morning I can't wait further to buy your "testing electronic components" online. It was a great book!

Once I read your guide, I hope I can start to repair my 19" Philips LCD monitor which has no power supply. I'll update you the status.

William Soo

Singapore

Few days later i got this email from William Soo again;

Dear Jestine,

I'm so lucky to found this wonderful website. My 19" Philips LCD monitor who has no power supply was back to its life after 4 days, where including I uses 2 days to read up your fabulous eBook. It was only a FET (part no. SSS7N60B) that was found faulty at the primary power section. I replaced it and its working fine now.

Beside this, I have pick-up some electronic repairing skill through your eBook and guidance.

Your eBooks were excellent because you:-

1. Uses simple English that easy to understand.

2. Short and concise explanation on each point.

3. Bonus reports had also given me many troubleshooting tips that help in repairing.

More importantly, you are very helpful and patient in guiding me throughout this repairing process via emailing. I look forward to your next new release of eBooks. I'm sure I will learn more from it.

I had not only save a big sum in repairing cost but also enable myself to pick up electronics repairing skill. It is priceless in gaining knowledge/skills".

Thank You.

Best regards

William Soo

Singapore

I Can't Stop Reading!

After many times been hitting your site at google when searching for how to fix a certain problem i began to examine your site a little bit more. I found these e-books you were selling but it didn’t feel good and I just thought that you were a scam. But after seeing your name at many sites I really felt that you were a decent guy that wanted other people to be as good electronic repairers as you. So I bought one e-book earlier this night and I am really amazed, I can’t stop reading. So much effort you have put into this work and selling it for this small amount. You have great descriptions and examples with explaining pictures, and a lot of information! I really like you now and I will for sure buy some more of your guides, they are absolutely worth it, thank you!

Adam Danielsson

Sweden

Awesome Book!

Hi Jestine

I have just completed my review of your e-book - there is no simple way to say how Awesome it is. I wish I would have had all this information when I was in school. I would be much better at troubleshooting now. Some of these devices were new then such as Triac and SCR.

I will definitely be keeping this close at hand for quick reference. Another item before I go any further is that until I read your e-book I didn't understanding your absolute reasoning for using analogue meters. I TOTALLY AGREE  and I thought I was alone with this idea. It is also much faster for checking faults and finding shorts . 

Leroy Tuttle

Canada

Electronic Repairer

Its feels like somebody is teaching right next to me! 

Dear Mr Jestine Yong

I am not into business of fixing lcd. I am just doing it for fun but I am so glad that I have found your books. Its kind the hard for me in the beginning because I am over 60 years old, retired already from the US navy and also from the US postal service. Now that I am home all the time I just want to do something I wanted to do to make my day go by. I like reading your books and it feels like it is not the same as reading books from the library. It’s feels like somebody is teaching right next to me. I like the way you show your techniques or approach to do thing in your way most of the time. I like to write a longer testimonial next time around. Anyway I just want you to know that I am enjoying your books. Learning a lot of things from it.

Thanks

Antonio Manalo

Washington

United States

Fantastic Book!

Hi Jestine Yong,

I have read your component testing book 3 times. It is a really fantastic book. I didn't realize that there are so many things you know.

Anne,

Keningau Sabah

Malaysia

Very Good!

Hi,

I’m reading your book very good so far........

Garry Norbury

Great Britain

 A Great Help!

Hey Jestine,

First off I want to thank you for the ebook its been a great help.... Well, I wish you continued success.

Thanks again,

Ray Ludvigsen

Texas

United States

Excellent! 

Jestine,

I've got a secret I think your material is excellent and very explicit.

Colin Nutton

Great Britain

Too Good To Be True!

Hi Jestine Yong,

"Thank you for answering my questions, you are too good to be true, never have I experienced such good help & prompt response to my electronic questions. You are what every electronic novice is looking for, give your self a pat on the back from me."

Rod Miller

Australia

Novice Electronic Repairer

 Most Practical And Useful Reference!

Jestine,

Hi, my name is Napoleon , from Sydney Australia. I came across your website a few months ago. Your articles are really very useful, educational and a very handy for reference. Thanks for sharing your knowledge and experience to everyone. I bought your Ebook on Testing Electronic Components. I can say that this Ebook is the most practical and useful reference an electronic repairer can ever have in testing electronic components.

Napolean Yanga

Australia

Electronic Repairer

Wonderful Book!

Hi Jestine,

I have read your book and found it a wealth of information …..thank you for your wonderful book I think this may be a new hobby for me.

Regards

Ned Kendle

Great Britain 

I Like The Book!

I like the Testing electronic components book. I know a lot of it already, but i like to read ideas from other technicians.

Robby J. Acton

Electronic Repairer

Netherlands

Well Done!

Hi Jestine,

I am gaining a lot of knowledge from your website and from your eBook testing electronic components, well done ..... Keep up the good work .

Danny Oneill

England 

Gain More Knowledge!

Hi Jestine,

I am currently reading your e-book and found it to be very helpful by helping to gain more knowledge in troubleshooting electronic devices such as computers.

Henry Tran,

Laptop Repairer

California

USA

Knowledge In Repairing Got Increased!

Hi Jestine,

Good day!

I have just read your e-book. And now my knowledge in repairing got increased! 

Nomer Varela

Electronic Repairer

Philippines

I Have Learnt a Lot of Things Within a Short Period!

Hi Jestine,

I have gone through your book. It’s well illustrated. Am enjoying reading every minute……….You are doing a wonderful in sharing your knowledge with us. I have learnt a lot of things within a short period after buying your book, testing electronic components. The article on your website about PSU is excellent. Please keep it up

Martin Martebele

United Kingdom

Click here to read the Short report of "Interview With Professional Electronic Repairers". Most computers already have Adobe Reader installed in order to read my book, but if you don't currently have it, a free download is available at http://www.adobe.com/products/acrobat/readstep2.html

Important: We will never sell, rent or give your email to any thrid party. We respect your privacy and your complete confidentiality is guaranteed.

Your privacy is SAFE with us.

Confident in Repairing SMPS!

Hello Jestine,

Thank you for the report. It is very interesting and it makes me feel more confident in repairing SMPS. I am now reading your e-book Testing Electronic Components and so far it is great.

Ayon Warren,

Electronic Repairer

Jamaica 

Safety In Troubleshooting Electronic Equipment?

AC and DC voltage and How To Test It?

Cold Ground And Hot Ground?

Continuity and How To Check Current And Resistance ?

Analogue and Digital Multimeter and How To Use Them Like A Professional?

Variable Resistor and How To Know If It Is Good Or Bad?

Resistor and How To Calculate The Four And Five Color Bands Resistor?

Open Circuit Or High Ohm In Resistor?

Capacitor and The Right Way To Discharge It?

Capacitor coding and How to Easily Calculate The Capacitance Value?

Capacitor Breakdown When Under Full Load And The Secret Way To Accurately Test It?

Voltage regulator IC and how to test it on board with power "On"?

The meaning of The Part Number Printed On The Body of Diode, Zener Diode, Bridge Rectifier, Transistor, SCR, TRIAC, Relay, Optoisolator, Crystal and etc?

The Most Accurate Way To Test The Electronic Components Mentioned Above?

And Many More......

Click Here To Watch A Video How I Test Electrolytic Capacitor

Click Here To Watch A Video How I Test A PNP Transistor

Click Here To Watch A Video How I Test A Silicon Diode

Click Here To Watch A Video How I Guide A Student To Test Electronic Components

Easy To Follow Step By Step Instructions. So Simple, Anyone Can Follow Along. (176 pages)!

How to use your Analogue And Digital Meter to Test Electronic Components

Complete Full Colour Photos (about 190 plus photos) To Go Along With The Instructions. This Removes All The Guesswork! 

Cover the electronic components like Fuse, Resistor, Capacitor (non-polar and electrolytic), LED, Diode, Schottky Diode, Zener Diode, Bridge Rectifier, Coils/Inductor, Crystal, Switches, Transformer (Linear and Switch Mode), Voltage Regulator IC, Bipolar Transistor, Field Effect Transistor (FET), Darlington Transistor, Horizontal Output Transistor, Varistor, Thermistor (NTC), Optoisolator IC, Relay, Silicon Controlled Rectifier (SCR) and Triac.

You Will Learn How to Use Analogue and Digital Multimeters to Perform Voltage, Current, Resistance and Continuity Testing.

Discover the right way to discharge capacitors

Find out which meter i use to test capacitor that breakdown when under load

What type of contact cleaner i use to service variable resistors

How you can easily read and calculate the resistor and capacitor coding

How to read zener diodes and transistors part number

...And much more-So much more!

Sounds too good to be true? Click here to read my preview book of the "Testing Electronic Components". Most computers already have Adobe Reader installed in order to read my book, but if you don't currently have it, a free download is available at http://www.adobe.com/products/acrobat/readstep2.html

More Real Life Testimonials!

Marvelous!

Hey Jestine,

Your Ebook is marvelous!

Peter Lambrechts

Belgium

CATV-Network Specialist

Full Of Pictures!

Wow! Jestine, you have revealed the testing electronic components secrets to everyone! After I read this eBook, I can say that the information is better than the traditional electronic books!

The information is full of pictures and the explanations are straight to the point for an easy way to guide the readers on how to test and do electronic repair.

Not only that, the bonuses that you give also can help the readers to easily and quickly improve their repair speed and techniques in testing electronic components. I will surely recommend this eBook to my website repair members! The price you charged was just too low, you should have charged higher than that. Thanks for the good information and great product!

Kent Liew

Malaysia

www.protech2u.com

www.fastrepairguide.com

Useful!

Hi,

I bought your ebook. I`m still reading it, its useful!

Siebo

Netherlands

Electronic Repairer

Every Technicians Should Have It!

Hi Jestine,

I have bought your E-book regarding testing electronic components. Its a very important book and every technicians should have it. It’s simple and easy to understand. Thanks for it Jestine.

Andi Sapli

Malaysia

Electronic Repairer

Email Support!

Dear Jestine,

Actually while searching for the tutorial to repair SMPS last Sunday, I have bump into your blog and also saw your ebook and never thought of buying it because most of the publisher sells ebook which is not really informative and only wanted to make money, but after read through you previous blogs and I then I decided to buy your ebook. Why? Simple, u seems to share useful repairing informations in the blog and it's free. And I thought, well, I can get many free useful repairing info and tips from your blog, and if I pay for the ebook I must have getting more useful information on repairing. And I did. Thanks a lot.

And here is the electronic repair question from him.

Actually this is the SMPS problem. After changing the PC817, 33uf Cap, fit in the 4N60 to replace the F09, and upon turn on it seems to have no switching at all.

Please help and please reply.

After few supporting emails, here is the replied i got from him.

Dear Jestine, 

I've found the culprit. It's the FR206 diode for 23V output which goes shorted. The SMPS works perfectly after I replaced it. Thank you.

Best Regards,
Clement

Facility Engineer

Kuching Sarawak

Malaysia

Sharing So Much!

"Your testing methods are very useful for my work. Thanks for sharing so much."

John Chong

Senior Field Application Engineer

Singapore

Your Ebook is Awesome!!!

Hi Jestine ,

  I have finished reading your eBook, testing electronic components. I found that all information in the eBook is very, very, very good and so informative. This eBook is good for student like me. Thanks a lot for the eBook. This is the first eBook that I have not regret to buy it. I will wait for your next eBook in electronic repairing. Once again your eBook is awesome!!!

Ali Abu

Student

Malaysia

I have been looking for something like this for a long time!

Dear Jestine,

Just got your book. I have been looking for something like this for a long time.

Ian Moree

Laptop Repairer

Bahamas

Your Book is well written!

THANK YOU MR YONG

YOUR BOOK IS VERY WELL WRITTEN AND I APPRECIATE THE SIMPLICITY YOU AIM TO RENDER ELECTRONIC REPAIRS TO ….YOU SHOULD BE VERY PROUD OF YOUR BOOK

Frank Ballaro,

New York

United States

"very impressed I am with your service"

Hi Jestine

Once again I owe you my sincere thanks. I have to say how very impressed I am with your service and it's a pity that a lot other companies don't follow your standards.

Once again many thanks.

One week later he emailed me:

Hi Jestine,

Firstly I would like to thank you for your ebook which has already helped me to repair my friends spare tv which has not worked for about 6 months. But thanks to the invaluable content in your book it now works. All it took was 30mins and a little bit of solder and a little bit of looking and there it was a dried joint. If it had not been for your book I would not have known where to start and I would recommend this ebook to anyone who wants to get involved in the field of electronic repair work. I am looking foward to my journey of learnig everything I can about this type of work and I will be amongst the first to buy your next book. May I wish you every success for the future.

Regards

Philip Pellett

United Kingdom

"Very helpful"

Jestine,

Hi there my name is Humberto and I recently purchased the testing electronic components which was very helpful in learning how to properly test components.

Humberto Merayo

United States

Easy to understand and very detailed!

Hello Jestine, 

I would like to thank you first for the wonderful eBook, I just completed reading it and it was full of information that is so easy to understand and very detailed plus pictures to help understand what you are talking about. Wish you always success and bless you more on this field. What a very nice reference to have and I would benefit a lot from it. I know. Thanks.

Mansueto Teneza

Germany

"Great simplified manual or reference"
 

Dear Mr. Yong,

Thanks for this great simplified manual or references. I run computer sales and services business and venture other services and businesses too. With this great manual, it helps and serves a training guide for my technicians especially new one's, where old and experienced come and gone for greener pasture and that's reality beside of teaching again by myself. I am waiting for the future release of your ebooks...

Best wishes.

Best regards,

Rosener Guyano

Philippines

www.surigao-csc.com

Any Novice Can As Well Understand It!

Sir, finally i have been able to pay for your Ebook on Testing Electronics Components and i will like to say that its really a wonderful book to have. I have gone through almost all the writeups and including the Bonus reports and its really really simplified that any novice can as well understand it. Thanks a lot sir and more grease to your elbows.

Obi Emmanuel

Lagos , Nigeria

Your Guide Is Really Helpful!

Your guide is really helpful! Keep up the good work as people like you help the rest of us understand electronics better, I would love to attend one of your courses but I live too far away!!!!!!

Many Thanks

Paul Hutchinson
Product Training Engineer

Great Britain

I Am Very Happy With The Guide!

I bought one of your guides, how to test electronic components, I am very happy with the guide very good.

Fernando Cano,

Electronic Repairer

United States

Amazing Book Full With Lots Of Information!

Hi Jestine!

A week ago I got your amazing book testing electronic components from your web page and I found an amazing book full with lots of information, congratulations.
 
Martin Flores

Mexico,

Most Reliable And Easy To Understand Book On The Subject Of Testing Electronic Components!

….as it is one of the most reliable and easy to understand book on the subject of testing electronic components. Your book was instrumental in the repair of an Acutron Multiwave electro muscular stimulator and TENS unit used by a friend of mine who is a licensed Massage therapist. Your book helped me find and replace several bad resisters, a diode, a capacitor and a shorted transistor. Without your book and the info it provides, this repair might not have been possible. Many thanks for your kind and generous response on my behalf.

God Bless

Daniel P Gover

Florida

United States

I Have Been Able To Repair More Than A Dozen Computer Monitors and TVs!

Thanks for your books they have helped a lot. I did not know anything about electronic repair and with the help of your books I have been able to repair more than a dozen Computer Monitors and TVs.  Thanks a lot!

Jason Clark

United States 

Build unlimited electronic project kits

Troubleshoot, Test and Repair electronic circuits or equipment

 Super Bonus Report #1

How To Speed Up On Testing Electronic Components

This bonus report reveals the secrets of how you can speed up on testing electronic components. The conventional way of testing electronic components is to remove the component that you want to check and test it with your meter. But in this report, you will see as which components you can actually check it while it still on board (in circuit) without removing it.

This save your precious repair time as more time you saved, you can repair more equipment. The value of this report I can actually charge for US19.95 but is yours when you order the “Testing Electronic Components” E-book today!

 Super Bonus Report #2

Exposed- Electronic Components That Breakdown When Under Full Load

Do you know that even though you have the best testing equipment you still can miss bad electronic components? Once you have missed the bad electronic components checking with your meter, the rest of your time spent on troubleshooting would be a waste! Not all electronic components are created equal in quality, structures and materials used.

In this report I’m going to reveal to you what are the electronic components that frequent breakdown when under full operating voltage and how you can use the fastest and easiest way to solve it.  (US15.95 value)

 Super Bonus Report #3

How To Easily Repair Intermittent Problems In Electronic Circuits

Some electronic equipment tends to developed intermittent problems in the electronic circuits. Intermittent problems give headache to many electronic repairers because some intermittent problems were not easily detected by test equipment.

In this bonus report, I’m going to explain to you with the help of photos all possible cause of intermittent problems that happens in electronic circuits and providing complete solution for the problems. Don’t miss out on these fantastic tips! (US15.95 value)

 Super Bonus Report #4

Electronic Components-Discover Why Surrounding Electronic Components At Integrated Circuit (IC) Are Important In Electronic Troubleshooting

You will learn how to troubleshoot any electronic equipment without fully understand how that equipment work with the help of this bonus report. This report will show you a tested and proven ways on how you can actually repair all electronic equipment by changing the suspect integrated circuit (IC) and testing the surround electronic components.

Again with the help of photos given in this bonus report, it would not take you long to easily repair any type of electronic equipment. (US12.95 value)

 Super Bonus #5

'The Importance of Voltage Testing That Every Electronic Repairers Should Know'

In electronic repairing, understanding only on testing electronic components is not enough to help you to completely perform troubleshooting on electronic circuits. You need to know the importance of voltage testing and how it can help you to cut short your troubleshooting time.

Certain electronic problems only can be solved by using the voltage testing method. In this report you will see how i successfully use the voltage testing method to repair a Computer Monitor fault. (US12.95 value)

 Super Bonus #6

The Art Of Success in Electronic Servicing.

Showing you step-by-step guide on how to increase your repairs, drop your Expenses, set up your repair business and promote your business.

This e-book has 50 easy to read pages and it is full of tips on how to be successful in Electronic Servicing line! (US15.00 value)

 Super Bonus # 7

'Testing Electronic Components Email Consultation'

Most other guide either charges hundreds of dollars for one-on-one email consultations or they simply don't include any support at all. As part of this package I'll include it absolutely free.

For the first 3 months of your training I will literally hold your hand and personally make sure that you are doing everything properly and efficiently. If you have any questions, concerns or just plain need some words of motivation, you can contact me via email and will receive a personal response within about 24 hours. In addition, there's no limit to how many emails you can send to me.

I only respond to training questions from my paying members, so this truly is a valuable bonus as you'll never be left confused or wondering. These aren't pre-canned answers or some phony support team pretending to be me... all email lands directly in my inbox and I’ll personally respond to ALL queries. Consider me your new online personal trainer!

Value=US74.95- You get it for FREE if you act NOW!

YES Jestine, Give It To Me Now!

I Want To Become A Professional In Testing Electronic Components And Start To Perform Electronic Repair!

Hello Jestine, well guess what happened to me this weekend. I was working on a Haier TV a friend brought in. Struck by Lightening, I checked for a short on primary side and guess what, a shorted main filter capacitor. But it looks good from outside. Well I changed, and put on TV, High voltage but no screen. I checked, video section and screen voltage can’t find the problem. Unbelievable, it was a small crack of the CRT small board. However I checked all types of components in the process. Would you believe that the Electronic Testing ebook is still helping me…I recommend anyone, especially newbies like me…get the electronic testing ebook, and make sure u read and re-read all newsletter.

Thanks

Jorge

Belize Central America

Dear Jestine Yong,

Thank you very much for your help regarding the Dell E198PF 19" LCD monitor, what I do is replaced the buldged e-cap 1000microFarad and resoldered all the dry joints of transformers.

I have another the same model monitor, I also replaced/resoldered the said parts. Now, both of the monitors are now working.

Thanks again,

Dexter

===================================

HI Jestine,

You are amazing thanks for your effort and dedication, your teaching is so perfect .Since i got the books i do not sleep.

I will come back for the rest. Again i am planning also to budget for all the necessary tools from you

Thanks again,

Samuel

============================

Hi Jestine,
Thanks for the books they are more valuable than i thought. They are a mine of wealth to me.
Evaristo M.

==============================

Thanks for the response to my email Jestine and thanks for the advice.
Since I have so much time invested in troubleshooting my LCD TV, I may have
to try swapping the T-Con board before I give it up as a bad screen. I’ll
let you know my results.

I’m impressed with the accuracy of your information and the helpful
trouble shooting technics displayed in your manual along with the great
pictures. For a young man you are a cut above and I really appreciate your
assistance. I’m a 69 year old retired Electronic Technician and thank you
for your help.

Philip M

==============================

How are you? It’s been a while since our last communication.

I’m fine thank you.

By the way, i have received all the newsletters that you have sent me. Thank you.

I have encountered error w/ my BENQ SD3731 again and below are the problems

that i have noticed

1.The display is completely messed up in the color department.
2. The settings menus are also all wrong in colors.
3. Switching to an input with signal gives also also has the same problem.
4. The colors of video are all messed up as seen in the picture
5. Color settings were reset to default, and any other mode doesn’t make it better.. just different.

I have narrowed down the possible problem with the LCD controller PCB but still it did’nt

work. Really need your expertise here. Appreciate your help as usual. Thanks.

This problem is either the mainboard or the LCD panel have problem. Since you said you have narrow down the problem to the lcd controller board then that’s mean most probably the lcd controller ic is at fault. Before that you need to make sure that all the output voltages are good and stable. The problem is it is difficult to get lcd controller ic. Usually if i come across such problem i will buy over the unit from customer since i could not get the parts and atleast i can salvage some of the parts for future use like the power/inverter board, mainboard and even the backlight.

Jestine

===============================

I checked manual again and found out some details. Please see the attached,Is these zener voltages are correct or not?

I like to learn Electronics and always log on your web site. I can not do this full time with my job. But I do some repairs when I am free.

Thanks,

Hi Pradeep,

Yes this is a zener diode and it should be 22 volt because if the VCC supply voltage 14.3 volt increase more than 22 volt the zener diode will conduct and this will shutdown the ic. In other words the zener diode is use for protection purposes.

Jestine

==============================



I have attached a couple of photos of the power supply I am trying to repair. IMG_2996 shows the PCB — I have removed a number of heat sinks from around some of the FETs and rectifier to aid clarity. IMG_2997 shows the FET I am concerned about.

There are four components on the 12V side — the K2611 FET, which is the one getting hot and could have something to do with my output issue, two 20N60S5 MOS Power Transistors and a diode R1560P2.

I have the same symptoms when I connect up to the original load (a Cisco network switch) as I do when I connect up a 5 Ohm test load. When the PSU does eventually give 12V (after about 1 minute — should be instant!) it draws around 2.5A when connected to Cisco switch. The 5 Ohm test load will draw 2.4A.

Once again, many thanks for your help so far, and if you could offer any further advice on what I could check, it would be most welcome.

Thanks for the photos. Since the FET is getting hot and drawing up amps, i suggest that you check all the components connected to it. Before that try power up the power supply and wait till a minutes, remove the power cord, quickly discharge the big filter capacitor and use your hand to touch on all the components. Besides the hot FET and if you could detect another hot component that means that particular component is the cause of the problem.

Another reason why the FET is hot was because the the gate signal may have problem. Try trace from the FET gate pin and see if there is any bad components.

Jestine

=================================

Dear Jestine

I have found two ecaps on one board that have these values - 35V 680uF .

When tested with the blue ESR meter give 0.00 on the meter which, I guess, suggests that they are shorted. I have ordered some replacements which was very cheap and we will see if this will improve the picture.

I will keep you informed as to the progress.

Regards

Jeff

HI Jeff,

You can confirm if the cap is shorted or not by using your analog meter set to x 1 or x 100ohm. Sometimes the blue esr meter probes cable too long also could give such reading.

Jestine

=================================

Hi Jestine.

Remember I talked to you about an lcd pannel 22.8 from a Dell to be exact with lines in screen. Well I had another 22.8 that had back lights burnt out and I knew back lights in bad screen with lines in it were good. So I just prayed as I started to pull both screens apart and swap their back lights and now I have accomplished my first back light replacement on black & silver 22.8 Dell monitor and everything went together quite well on the screen with burnt out back lights. Now I have a good working 22.8 Dell LCD after rebuilding inverter board also. It’s very tricky lining up all the plastics inside the display but it worked and I am very happy about it. This is my first accomplishment in doing that.

Gary

====================================

I was repairing a Sony 29" TV at a customer site, cannot switch on. Found the HOT and some components failure, changed the HOT and the components of the same value, now the TV turns on and the picture and sound are coming okay, except that the picture color is very dim and scanning lines can be seen on the screen. I set the brightness, contrast, color, etc of the TV and after a few minutes the picture colors dims by itself.

Hi Jay,
Make sure the heater supply to the tube is good. If you could see a bright orange light then you will roughly know that the supply is enough otherwise check the heater circuit. Next it could be the problem of weak picture. Before that make sure all the voltages at the CRT board pins like the G2, R, G, B, G1 (if have) are good.

Jestine

=====================================

Dear jestine,

(5 volt line)voltage reach to the main board but i don’t know reach or
not to lcd.How can i test lcd voltage?How many voltage will reach to
lcd?Can i test lcd voltage without connecting lcd?

Thank a lot for your reply.I will looking forwards your reply.

Best Regards,
Linn

HI Linn,

Usually 1.8v, 2.5 v or 3.3 v depending on the model. Some lcd panel have a small smd fuse and if it blow then there willbe white display. You can test the lcd controller ic voltage in the lcd panel using your dc voltmeter . Just carefully place the probe in one of the pins and it should show the voltage (1`.8, 2.5 or 3.3v).

Jestine

=====================================

dear justin


I have a SONY TV(kv2092) the problem is with the power supply section
when powered ON the fuse blows along with the chopper FET C3679,( the costliest part and hard- to-get
in my country).Bad /cold soldering was suspected and all the critical points was resolidered (using good quality lead)
suspected leaky capacitors and power diode/zenners replaced, there is nothing short in the HORIZONTAL&VERTICAL sections,
if this set powered with an external 115V power supply salvaged for another TV the sets works fine….my efforts to assemble a
115v power pack for this set ran into rough weather, I seek your FREE expertise and if you can help me to troubleshoot this power-supply
I shall be glad. It is not understood why SONY has provided short circuit and overload protection in their power supply design,
pls be kind enough to send me a reply, also help me design a 115V B+ (14v,7v) power pack for this set which will be sincerly appriciated

yours truly

Abraham

Hi Abraham,

FET part number should start with "K" and not "C". Perhaps the FET could be K3679. In your case, you need to check all the components in it which include the transformer primary winding and also all the secondary diodes. If all check to be good then you may need to replace the power IC and retest. Generally when the power FET shorted the power IC will give way too.

Jestine



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i have my customer crt monitor who is 1/2 ic clear picture and 1/2 is dark at the bottom please assist me sir.

lito

HI Lito,

Make sure the 2 supply voltages are good to the vertical ic. If all check to be good then direct replace the vertical ic and retest.

Jestine

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Hi Jestine,
Jestine i would like your advice on a matter that i want to ask for some time. While doing voltage test on crt monitors and televisions is it safe (ok) to remove the board completely from the case and the connectors from the tube including the high voltage wire and do the tests as long as i take care to stay clear of the big red wire (HV) ?

Thank you.

HI Eric,

If possible do not remove it because in certain circuit some components will blow if there is no load and to some, the circuit will shutdown. The best is to have all the connectors connected.

jestine

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i have a panasonic tv and this is what it does.at times it shows normal picture.but then

most of the times it shows half pictures the top cliped and has many small horizontal lines i.e the half top.then at times the screen goes

black with only a sharp line in the midle of the screen .please assist me this is irritating i have tried to soder on components on the board thinking maybe it could be due to dry joints but to no avail.help my family wants to watch.

Hi Richard

Check the vertical ic and make sure the supply voltages are good and no dry joints in this vertical ic and the corresponding area.

Jestine



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sir good day to you,,,,pls advise me sir,,,,,i have check 14inch crt acer monitor,,for the first time,,,,the problem is, one bright horizontal line at the center of the screen,,,i open the cover,,and i head straight to vertical section,,,i scan dry joints,,,i resolder the vertical ic,, and re test,,,the one bright horizontal is gone,,but only blue display appear on the screen,,,i re solder also dry joints at the crt neck board,,,no lack,,,,so i perform voltage checking at the 3 cathods,,,,it reads 53v,,56,,,57,,,i noticed the supply voltage is not level,,,all secodary volts is ok,at the smpt,,,the 75v supply at crt neck board is slighly low to 73v,,,i scan the e-caps at the crt neckboard,,,rated 1uf/100v,,2 were reads high,,,so i replace,an test the voltage at the3 cathods,,,all rated 57v now,,,but the sreen is blue display again,,,i check the esr of 75v rails e-cap,,its high reading 25 ohms,,so i need to replace also,,,,maybe my analysis,,,it is possible the vertical ic itself is gone sir?i try to chek the pins of vertical ic voltages,,,many pins reads 5.36 something volts,,,one pin read 41.5v,,maybe some pin of vertical have short,,am i right sir?pls..advise me sir,,,,thanks,,,,by the way i pull out the whole board to acces my repair,,,because its very hard to chek the components inside the board,,,,,,thanks ,,roger

HI Roger,

You need to check if there is supply to the video pre-amp ic and if possible try direct replace the pre-amp ic and retest. I don’t suspect the vertical ic because you already get full screen.

Jestine



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Am just enquiring about the schottky diode if how many types of schoottky diode.

There are many few types (physical package) of schottky diode and each type is depends on the part number.

About the data sheet for electronics components like IC and so we can compare the Schottky diode and a normal diode.


The best is to replace a schottky diode with another schottky diode. Please do not replace with a normal diode as it can go shorted easily.

Do you have any online for electronic forum in case for asking some question regarding repair and trouble shooting.


There are many. Just type in Google " electronics repair forum" and you can see a list of them.

Jestine



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I have NEC lcd monitor which goes blank in seconds and when you switch it on again it comes up AND GOES BLANK AGAIN. I have checked the power section and found some swollen capacitors(470uf, 25v) and one 220uf 25v capacitor which I changed with the same spec. but on trying it the problem repeats with the exception that the monitor no longer goes hot. Kindly assist me

thanks,

HI Nelson,

Make sure the inverter ic is getting supply voltage and no dry joints in the high voltage transformer. If all check to be good then suspect one of the backlight have problem.

Jestine

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I just bought a second hand oscilloscope airon 2channel but dont know how to use it any idea u can advise me.

Hi Jamaludin,

Using scope is a big subject and there are many books at amazon.com that can fully explain how to use a scope. However in electronics troubleshooting, we just use either DC or the AC setting depending on what type of signal you are testing. If you want to test on DC then set to DC and place your scope and look at the waveform and the setting of the volt per division. A good dc voltage should be a straight line. For checking signal then you need to set to AC. Place your probe at the test point and look at the waveform by adjusting the volt and time per division. You must know what type of waveform you should expect before placing the probe. If you expect a square wave and get no waveform then you know that particular point/circuit have problem.

Jestine

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Hi Mr. Yong,
How do you do? I hope everything is very well with you and your blessed familly.
I would like to take the oportunity to congratulate you for the very good quality
books I purchased from your site. Thank you very much, I wish you more success.
My regards,
Toni

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Hello Jestine,

i hope you are ok,

i would like to inform you that the tv i was repairing now it is working fine.
the problem was the jungle ic cxa 2159s which was causing the power supply not to start and showing two blinks error code.

i have ordered the ic because it can’t be found here in my country. After replacement of this ic the tv is working. your book are really good and you have given me very good troubleshooting technics that i did not know before.

i will give you my order for blue esr meter and ring tester soon!

thank you very much.

Safdar Khan.

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HI Jestine
How are you ,i want to say thanks for your Books i got all the books and i have gone through all .i am starting the second round i am so impressed .

Thanks for everything,
Regards,
Samuel.



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Recalling your article about “Why HOT in CRT Monitor Get Shorted? It is said that a higher than normal B+ Voltage will kill the HOT instantly. What is causing the B+ voltage to be higher than normal?

The feedback circuit mostly a bad resistor causing the pwm ic to turn ON longer then it should be.

In a 17” CRT monitor that I am working now, only the red color is not even distributed, as the photo attached. I had tried to adjust the presets on the CRT board, but didn’t help. What is causing this kind of a problem?

It can be bad crt driver/video pre amp ic, dry joints in crt, missing/low supply voltage to the ICs. This problem can be troubleshoot using scope.

If we switch on a CRT monitor without signal ( there is amber led lit ), which supply voltages that already on that we could check for voltage testing,

All the output voltage supply from the SMPS.

are all supply voltages on CRT board also already there? How about the filament supply voltage, will it be already there? Are the supply voltages that are already there different from each monitor?

Usually amber light means no high voltage thus there will be no G2, G1 and high voltage. RGB voltage will be there. Heater voltage is depending on the monitor design. Some CPU in the monitor could cut off the heater voltage if there is missing H/V signal.

Jestine

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1. The power board seems okay. All capacitors look normal. The out put connetor has 8 pins, where 2 pins have 12V output and 2 pins have 5V output. The other 4 pins are ground.



2. The invertor board input connector has 8 pins, where 3 pins (pin 1, 2, 3) have 12V, and the rest of the pins have 0V.



3. If the on/off pin should have 3.3V, the on/off signal is probably not there.



4, There is no burned resistor, capacitor, diode or transistors observed.


I don't have the schematics. What do you suggest to check next?



First you need to find out the inverter ic schematic to locate the supply pin. Make sure this pin must have the right supply voltage. Sometimes black does not mean it has no picture. it could have faint picture. Assuming it has the supply voltage next thing you need to check if the backlight connector have any ac voltage. Probably about 500 to 800 vac. Test it with analog meter. If there is no voltage at all then compare the ohm reading of the top and bottom high voltage transformer. Make sure the primary and secondary winding did not open. If you have the scope you can check the output waveform of the inverter ic. Please let me know the status of this repair case.

Jestine

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Hi! How are you today?

I'm fine here-thanks.

I am fine here and please if you dont mind, I would like to know why does the LCD desk top monotor shut dowm immediatly after switching it on can you please explain that for me

Bad supply voltage, dry joints in inverter board, bad backlight.

because its my personal computer which I use. I opened in and and checked there is a DC voltage on 300Vpresent at the 1st stage filter but I cant get futher I also checked there are 2 other filter capacitors that are at the 2nd stage which are buldged a bit I took them out and checked them with the meter and they seem ok

You need to directly replace it eventhough it test ok with your meters. I guess this could be the problem

and I also checked the transistor # KA431AZ which is a programable shunt regeluator near the opto coupler but I dont know weather that is faulty or not it comes in a package TO-92. led 1 is ref and led 2 is anode and led 3 is cathode. can you please help me as how to check if this transistor is good or not and and please let me know what could be the symtims for the monitor to shut down because I replaced another monitor with the same cpu and that monitor works well.



TL431 can't be tested using meter because a bad one will give you a good reading. I suggest that you directly replace and retest. I suggest that you replace the bulged caps and retest the set again.

Jestine



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I use SAMSUNG MONITER ,MODEL 753s .The probleme is one enches
horizontal line come.PLESAE HELP WHERW THE FAULT.

HI Rupesh,

Check the vertical circuit area especially the supply voltage and make sure no dry joints. Make sure the supply voltage is good.

Jestine

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Hello Jestine, I have decided to write to an old friend, whom I have neglected for such a long time and for this I appologise.

No problem. It is an honor to receive your email.

I am still building on my project, but training myself and finding out, the correct way to do things for instance :-

On the perf. board, how much solder to use, how thick the solder must be,

You can see other electronics board for reference.

how not to solder two tracks together,

Solder one point at a time and recheck the soldering to avoid double solder.

How to use the solder sucker properly.

There is only one way to use it. Press the sucker and when the solder gun tip is on top of the joint and melting, then place in your sucker on top of the melted joint/solder and press the sucker button.

The lessons learnt thus far:- 1 solder must be Thin. 2 Only feed one small touch at a time. 3 If too much solder, use the solder sucker and clear off all excess then start again,

A soldering iron with a sharp round point works beautifully,and the joints are good ( no dry joints ).

Component placing very important or the board becomes too small. If I am satisfied I will test and if not, then I will start again till I am satisfied..



You are right!

Jestine

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sir good day...ive already repaired my television

av-2793...ive checked the g2 voltage and it measured at the range of 300 volts something..and the horizontal output is also good,,,then i checked the heater from flyback and i found out that it burn...the value of that resistor is 10 ohms...then i replaced it with a new one then when i turn on my t.v it turns to has dislay..thats all sir..thank u very much...godbless

Dan

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I would like to enquire about my Samsung MP3 player.

The problem starts after it fell onto the ground a few times. I feel something isn't right with the earphone socket. Everytime I plugged my earphone to its socket, sound isn't heard. But after I pressed it hard, then the sound can be heard nicely.

So please kindly advise.

HI Tienny,

It seems that the circuit track may have broken. You need to open it up and check or solder back the broken circuit track.

Jestine

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I’ve found the problem was caused by burnt resistor R718, shorted Q704 downstream of the B drive pin of the h/v osc. IC as you could see from the photo attached. I’ve replaced both components and now the monitor has full width.

Congratulation!

But there is another problem, the monitor has ticking ( tic..tic ) sound every 10 seconds or so, and this again would frighten the user. I had checked the internal cap of the flyback has 1.6 nF. What else could be causing the ticking sound? Where is this tick sound coming from?

The tick sound most probably came from a leaky internal cap in the flyback. Sometimes the cap can be checked good but fail when under load.

Jestine

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Hi Jestine,
Glad to meet you on face book. I am an ardent fan of yours.
Jestin , Is there any way to test and confirm that an IC is faulty or bad with an Analogue or digital meter ? At least is there any instrument for testing ICs?.

The analog or digital meters could only check for the supply voltage and short circuit (ohm test). You need a scope to check for the output. You may need a huntron tracker to check the signature of the ic. There are many types of ic in the market usually it will need different tools to test it. memory ic can't be test with the equipment above because the problem could be corrupted program

Jestine

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Thanks for your great articles!

You are welcome!

I try to repair a power / inverter DS-1107A From Benq FP731.
In my case I found the 4 transistors sc5707 testing good.
But Q 743 shorted and PF751 broken, and Caps 707 and 709 bulged.
No visable bad solderings.

Q743 reads D10PF06 / 30F351, but what is the real type of this part?
I googled, but I am not sure it is really a P ch Mosfet, equiv to STD10PF06, which is a
smd mosfet. I need a normal model like the 4 transistors 2sc5707.
Can you please tell me what to order for this Q743/Q751?
And where are these available?

If you could help me with this I would be very very obliged.

The other parts I can order as a kit I have seen.

Yes it is a P channel FET. It is D10PF06 or STD10PF06

http://www.utsource.net/ic-datasheet/STD10PF06-325750.html


You can buy other parts from this website too.

Jestine