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How To Completely Test LCD Inverter Transformer

By Jestine Yong on January 5, 2015

The function of LCD TV/Monitor high voltage transformer is to produce high AC voltage (from few hundreds to more than a thousand AC volt) to light up the CCFL backlight. If this transformer have problem it will cause the LCD screen to light up for a second and then shutdown or to have dim display problem. Basically the high voltage transformer can have four types of problems such as:

1) Open circuit especially the secondary winding

2) Shorted in secondary winding

3) Increase in resistance in secondary winding

4) Breakdown when under load

Note: The primary winding seems to be quite robust and rarely give problem.

How are we going to know if the high voltage transformer have problem or not? The answer for it is to use the right test equipment to check it.

1) Open circuit especially the secondary winding

All secondary winding should have resistance between several hundred to several thousand Ohms. Just place your Ohmmeter at the secondary pins and you should get the Ohm reading. If you did not get any reading means the secondary winding already open circuit.

An open secondary winding can cause display to shutdown in few seconds or dim display depending on how many transformer is used in the circuit design. This means if the circuit design is only using one high voltage transformer to support one backlight and if the secondary winding is open circuit then there will be dim display problem. If it is uses two transformers and one of the transformers secondary winding has an open circuit then the symptom would be display shutting down in a second or two.

Note: Primary winding also has resistance and the Ohm value is very small.

2) Shorted in secondary winding

If there is a shorted secondary winding, a normal multimeter would not be able to detect it. You need to use a coil tester such as the Blue Ring Tester. For a much bigger high voltage transformer you can expect at least 4 LEDs will light up. If the tester did not light up at all means the secondary winding is shorted.

Note: You also have to take note that a slighlty small high voltage transformer secondary winding may not be able to read by the Blue Ring Tester. The tester could read up until 2 or 3 LED lights only. However, if the LCD inverter has more than one high voltage transformer then it would be easy to judge the result (comparison test).

You can use the comparison method on the two transformers and locate the faulty one

Some designs only have one transformer but you still can compare the winding because the above transformer have one primary winding and two secondary windings

3) Increase in resistance in secondary winding

You will be surprised that the resistance in secondary can increase when there is a problem. It is due to a prolong increasing in temperature in the high voltage transformer.

If you notice a vast different in Ohm’s reading (usually higher resistance) meaning to say the transformer is bad.

I have found many LCD high voltage transformers problem are due to increase in resistance in secondary winding in one of the transformers.

Note: A slight different in resistance reading is acceptable when checking on two similar transformers.

Most of the LCD inverter boards have more than one high voltage transformer thus it would be easy to compare the secondary winding and find out the problematic one.

4) Breakdown when under load

Although is rare, I did came across one before. On top of the secondary winding I saw a very tiny spark while the LCD Monitor inverter was working. It caused intermittent display shutdown. When I took out the transformer and test it, it seems to be working fine. A replacement brought the LCD Monitor back to life again.

The question now, what if the transformer is fully covered and you can’t see the spark. In this case, it would be a little bit tough to solve it. What you can do is to make sure there is no bad components in the inverter circuit and all the CCFL lights are good (you can test them with a CCFL backlight tester). Check the transformer for good resistance reading and make sure no shorted reading (test it with a Blue Ring Tester). This means if you have checked all the parts and the LCD Monitor or the TV still have intermittent display shutdown problem then there is a possibility one of the high voltage transformers could be breaking down when under load.

Conclusion- I hope the above article will help you in solving LCD problem that is related to the inverter high voltage transformer. If you have additional method in testing/checking of the high voltage transformer please do leave your comment below-thanks.

This article is brought to you by Jestine Yong

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LCD Monitor repair lcd tv repair

116 Comments

Owais Akhter

January 5, 2015 at 8:24 pm

Dear Justine,
Nice article and informative too. I will use this methods when i will encounter faulty High Voltage transformer in LCD Monitors.

Likes(9)Dislikes(1)

Reply
- admin
  
  January 5, 2015 at 8:49 pm
  
  HI Owais,
  
  Thanks.
  
  Jestine
  
  Likes(8)Dislikes(1)
  
  Reply
- Emmanuel
  
  February 13, 2017 at 10:17 am
  
  Hello Jestine yong, Thank you so much for your inverter transformer article, it widen my understanding....
  
  Likes(0)Dislikes(0)
  
  Reply
  - Jestine Yong
    
    February 13, 2017 at 1:51 pm
    
    Hi Emmanuel,
    
    You are welcome.
    
    Jestine
    
    Likes(1)Dislikes(1)
    
    Reply
Tonke

January 5, 2015 at 8:29 pm

Jestine, what is the use of checking high voltage coils if they are not for sale seperately. I guess it is dtill a matter of exchanging the inverter board. Please correct me if I'm wrong.

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Reply
- admin
  
  January 5, 2015 at 8:50 pm
  
  HI Tonke,
  
  It depends on the type of equipment. For LCD Monitor/TV you can try find it from ebay or from Chinese website like aliexpress
  
  Jestine
  
  Likes(6)Dislikes(0)
  
  Reply
Ernst

January 5, 2015 at 8:33 pm

Jestine,

Thank you for this help. As always you did great work

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Reply
- admin
  
  January 5, 2015 at 8:50 pm
  
  HI Ernst,
  
  You are welcome!
  
  Jestine
  
  Likes(0)Dislikes(0)
  
  Reply
Pepper Myers

January 5, 2015 at 8:56 pm

I chose to do the `divide and conquer’ technique on
inverter/CCFL circuits. I bought a 12vdc-in/inverter with
a CCFL tube for ~10USD. It was intended to do mood
lighting in an automobile.
The inverter output is a 2 wire plug going to the CCFL.
If I wanted to test an unknown inverter, I just plug my
(working) CCFL in - lit=good, not lit=bad.
Same goes for the unknown CCFL. I plug my known good
inverter in - lit=good, not lit=bad.
If your inverter is the bad boy, then use Mr Yong’s super inverter
troubleshooting techniques to lead you to a component-level fix!
Thanks,
Pepper TN-USA

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- admin
  
  January 5, 2015 at 9:15 pm
  
  HI Pepper,
  
  Thanks for sharing
  
  Jestine
  
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  Reply
marco tapia

January 5, 2015 at 9:42 pm

I always look forward to reading your articles because for someone learning like it's always good to learn from the best and you are one of the best so thanks for the article.

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- admin
  
  January 6, 2015 at 7:51 am
  
  Hi Marco,
  
  Glad that you liked it.
  
  Jestine
  
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  Reply
Mahmoud

January 5, 2015 at 11:15 pm

This is the best article of your articles in the field of LCD

Thanks for your sharing Mr.Jestine

Mahmoud Egypt

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Reply
- admin
  
  January 6, 2015 at 7:50 am
  
  Hi Mahmoud,
  
  You are welcome!
  
  Jestine
  
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  Reply
Scott

January 5, 2015 at 11:44 pm

Excellent article as always. I find your work to be very helpful in my own troubleshooting, the blue ring tester is one of my most valued tools when working on lcd monitors, which accounts for a lot of my work. Thanks again and please keep up the good work!

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Reply
- admin
  
  January 6, 2015 at 7:49 am
  
  HI Scott,
  
  You are welcome and Blue Ring Tester as what you have said is also one of my most valued tool.
  
  Jestine
  
  Likes(2)Dislikes(0)
  
  Reply
daniel

January 6, 2015 at 12:12 am

Always greatful for all the repair tips.Thank you

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Corriete

January 6, 2015 at 12:39 am

yes sir thanks for sharing this wonderful piece. really appreciate it.Happy new year

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Jimmy Lane

January 6, 2015 at 2:19 am

Thanks Jestine. I do not have a blue ring tester. Do you or anybody else here think a sencore va48 or va62 ringer test would work too?
Thanks

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Reply
- admin
  
  January 6, 2015 at 7:57 am
  
  HI Jimmy,
  
  I have not used the Sencore testers before thus I'm not sure if it cane be used to check on the coil's winding. I suggest that you take some good lcd inverter transformers to test it out.
  
  Jestine
  
  Likes(0)Dislikes(0)
  
  Reply
Robert

January 6, 2015 at 2:23 am

Nice article. Thanks Mr. Yong.

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Reply
Nelu

January 6, 2015 at 2:38 am

Hi Jestine and Happy New Year , very nice article thank's alot

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Reply
moshe

January 6, 2015 at 3:43 am

very useful.
thanks for sharing.
moshe

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Reply
- admin
  
  January 6, 2015 at 7:47 am
  
  Thanks to all!
  
  Jestine
  
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  Reply
svenna

January 6, 2015 at 4:47 am

I wonder of about the transformers.Looks like the same but
Winding chance of 25 inch,45 inch i put a transformer from a
board from a 30 inch lcd,to a 25 inch Acer that wore broken,
sparks from copperwire.But now i hawe light about ten sec.
Are the inverterboard detecting? howe mutch millamps getting true?
Shut it down with owerload?That is my Question-

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Reply
- admin
  
  January 6, 2015 at 7:54 am
  
  HI Svenna,
  
  You have to replace with the same type and part number of inverter transformer. A wrong substitution will cause problems.
  
  Jestine
  
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  Reply
  - ssent
    
    January 23, 2015 at 5:08 am
    
    thank for the good work and information u a providing
    
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    Reply
Albert Hoekman

January 6, 2015 at 5:38 am

Hello Jestine, I like this article very much because it's a helpful manual for problems with inverters.

I like to wish you all the best for 2015 en keep on going with your investigations and good articles.

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Reply
- admin
  
  January 6, 2015 at 7:52 am
  
  HI Albert,
  
  Thanks!
  
  Jestine
  
  Likes(0)Dislikes(0)
  
  Reply
S. C.

January 6, 2015 at 5:46 am

You may have already answered this somewhere else but is there a simple circuit design that could be plugged into an inverter board to simulate a CCFL or bypass one of the lamp sockets so that the inverter board doesn't shut down all the lamps for 1 bad lamp? For instance, if you had a 6 lamp LCD and 1 of the lamps is bad (I know that the other 5 are the same age/probably need to be changed, etc.) which causes the LCD to black out and I need to get the LCD up and working (usually just having 4 or 5 lamps working is more than bright enough)until I can get the lamp replaced at a later time.

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- admin
  
  January 6, 2015 at 3:42 pm
  
  Hi S.c,
  
  I'm not sure if you have read this article or not:
  
  https://www.jestineyong.com/consumer-electronics/lcd-televisions/how-to-bypass-lcd-tv-inverter-board-shutdown-backlight-system.html
  
  Jestine
  
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  Reply
McVaughn

January 6, 2015 at 7:03 am

I found you information to be very valuable as usual. And I also wanted to add that I have seen the same symptoms where the monitor shuts off after couple seconds or the screen is dim but the cause of it was faulty backlamps. I will post an article if you like....keep up the great work.

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Reply
- admin
  
  January 6, 2015 at 7:52 am
  
  Hi McVaughn,
  
  Yes I would like to have the article. Thanks.
  
  Jestine
  
  Likes(0)Dislikes(0)
  
  Reply
norie

January 6, 2015 at 7:55 am

Jestine,

Thank you so much for this tips. This could really be a grate help fur us..

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Reply
- admin
  
  January 6, 2015 at 3:24 pm
  
  Hi Norie,
  
  You are welcome!
  
  Jestine
  
  Likes(1)Dislikes(0)
  
  Reply
Taring K Arioka

January 6, 2015 at 10:19 am

Nice article and thank you for sharing

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Biruk aweke

January 6, 2015 at 12:45 pm

Hi jestin it is very important and interesting article thanks.

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Reply
Mervin

January 6, 2015 at 1:36 pm

I like all the articles, somehow everytime you learn something.
Thanks Jestine

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Yogesh Panchal

January 6, 2015 at 3:24 pm

Sir, Thanks for helpful tips.

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Aron Shelton

January 6, 2015 at 4:00 pm

Very nice article, I always look forward to them. I like that they are about something that will help most of us but if not this one Im sure the next will be something that I realy need help with. I, m glad you mix up the topics Thank YoR Always something good for al our different
Needs

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Reply
- Robert
  
  January 6, 2015 at 9:17 pm
  
  That's true Aron. Also even if we don't need it right now, we can always come back to it at a later time when we do need it! I do the same with all of my repair books. I try to re-read them all once every 2 or 3 months.
  
  Likes(1)Dislikes(0)
  
  Reply
Memo

January 6, 2015 at 4:19 pm

Very nice article. Thank you Mr. Yong.

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S. C.

January 6, 2015 at 6:31 pm

That article is somewhat helpful but I am looking for a way to bypass a single bad CCFL in order to get a LCD working (inverter is good, remaining lamps are good/working)until I can get a replacement CCFL ordered and installed (can't really maintain a spare parts inventory here due to policy and it can take over a week to get a replacement part in).

This is mostly concerning the straight CCFLs (not the U-shaped ones which I don't really know how to test when they are installed in the LCD), but is it possible to splice a jumper 2 pin plug to the 2 pin plug of a working CCFL and plug it into the inverter and make the inverter "see" 2 lamps or would I be running double the current, etc. into the single lamp and end up damaging the working lamp?

Thanks for your assistance.

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Reply
- admin
  
  January 7, 2015 at 3:02 pm
  
  HI S.C,
  In LCD Monitor I use capacitor and the complete modification can be found in my ebook:
  
  http://www.lcdmonitorcasehistories.com/version2.html
  
  I have seen other repair tech that placed an additional backlight on top of the internal casing and sealed it with a tape. As for the using the jumper on the 2 pin plug, sorry I have not used it before.
  
  Jestine
  
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  Reply
Abdul

January 7, 2015 at 8:32 am

Very informative, step by step advice.
I always look forward for your articles.
A good mentor.
Thanks for sharing Jestine.

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Reply
- admin
  
  January 7, 2015 at 10:39 am
  
  Hi Abdul,
  
  You are welcome!
  
  Jestine
  
  Likes(0)Dislikes(0)
  
  Reply
Nitram Mosay

January 7, 2015 at 11:42 am

Hi Jestine,
This article and previous ones are very informative,
helpful and useful for me, who's very interested in
electrical and electronics.
Thank you very much Mr Jestine for sharing them.
HAPPY NEW YEAR,(2015) & may the Lord continue to protect & bless you & your family always.

Nitram, Papua New Guinea

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Alex

January 8, 2015 at 1:10 pm

Sir

I read your article regarding solving the High Voltage Transformer or we called it CHOPPER.I always encounter a big transpormer or chooper when repairing a CRT TV. This transformer is normally producing a 9volts and 115volts as indication that this transformer is working normally and sometimes I used to removed this transformer from the board and I test it manually using analog tester...First , step is to check the primary side of the transformer using the continuity of the pins of the transformer .If I hear a sound means the connection of wires is intact or nothing is cut from inside..or if not means the connection is badly disconnected..About the secondary side of the transformer, same test I used to apply using my analog tester set 10K ohms..

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Reply
- admin
  
  January 8, 2015 at 7:20 pm
  
  Hi Alex,
  
  The primary side winding has to be tested using a coil tested because a shorted turn will not be able to detect by a normal Ohm meter.
  
  Jestine
  
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  Reply
- Robert
  
  January 9, 2015 at 10:36 pm
  
  Hi Alex,
  Click on "Blue Meters", and then read about the "Blue Ring Tester". It is much more dependable for checking transformers than a DMM or VOM.
  
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  Reply
Sunil

January 8, 2015 at 9:52 pm

Dear Jestine
Hopefully U &Family will be ok also happy new year wish from me
I like your article additional way to check transformer is to put a series
Lamp in primary side of transform er it will glow sharply if there is short in primary or secondary
Thank a lot
Have a nice day

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Reply
- admin
  
  January 9, 2015 at 9:45 am
  
  HI Sunil,
  
  Thanks for sharing.
  
  Jestine
  
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  Reply
mark

January 9, 2015 at 10:27 am

Hi Jestine,
It was interesting to read that the increased resistance of the secondary winding in one transformer can cause a 2 transformer inverter to shut down. In your experience, what percentage difference in resistance between the 2 transforers can most inverters still work with?
Your example in the article showed 456 ohm vs 464 ohm which is only a 1.3% difference.
Cheers Mark

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Reply
- admin
  
  January 9, 2015 at 1:37 pm
  
  Hi Mark,
  
  From experience, the bad one will usually have at least 20 to 30% more.
  
  Jestine
  
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  Reply
Amir Mukhtar

January 12, 2015 at 1:55 pm

Sir, Jestine yong

I read above article . it was too informative and Learnable .
Thanks you

you did great for Learners Like me.
Allah Bless you a Lot .

A student of Electronics
Amir Mukhtar AShrafi

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Reply
lyan

January 19, 2015 at 11:03 am

Hi Jestine, Thank you for sharing wonderful articles. Happy new year..may the good Lord blessed you and your family.

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Reply
- admin
  
  January 19, 2015 at 2:49 pm
  
  Hi Iyan,
  You are welcome and happy new year to you too.
  
  Jestine
  
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  Reply
Bulent Nur

August 9, 2015 at 6:11 pm

Many thanks!

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Chris

August 11, 2015 at 10:24 pm

I like your writings, full with infos and the way how you describe is for me fantastic.
Thank you for sharing you knowledge.

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Reply
- Jestine Yong
  
  August 12, 2015 at 8:58 pm
  
  HI Chris,
  
  You are welcome.
  
  Jestine
  
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  Reply
RONALD

September 5, 2015 at 7:39 am

MY IS NOT A COMMENT BUT A QUESTION SIR HERE ITS(I RECEIVED 21INCH TV WHEN U POWER IT ON,IT WORKS WELL FOR SOME MINS OR HRS AND IT GOES OFF SIR WHAT WHAT COULD BE APROBLEM?

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Reply
- Jestine Yong
  
  September 7, 2015 at 9:00 pm
  
  HI Ronald,
  
  Check for dry joints in the power supply section. The power supply has to have good output voltages.
  
  Jestine
  
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  Reply
Mark Tembo

September 8, 2015 at 1:00 am

Thanks very much JESTINE, you are very kind and you have really simplified these tests so that I can never get lost when I encounter a similar problem.

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Junjon L. Santuyo

September 27, 2015 at 1:37 pm

This was very new in my field of Repair, very informative Mr. Jestine Yong, It keeps me update on things that I didn`t usually do in repair. More Power

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Ongwech Albert

October 5, 2015 at 2:11 am

Very Authentic Information.The Firs Of Its Kind. I Don't Know How To Thank You. I Would Like To Become An Electrical Wizard. Hahaha...

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Reply
- Jestine Yong
  
  October 5, 2015 at 10:32 am
  
  HI Ongwech,
  
  Good to know that you want to be an electrical wizard. There will be lots of things to learn.
  
  Jestine
  
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  Reply
Lamb Huc

October 20, 2015 at 4:05 pm

Big thanks to your valuable info Mr. Jestine.
More power!

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Reply
- Jestine Yong
  
  October 20, 2015 at 4:07 pm
  
  Hi Lamb,
  
  You are welcome.
  
  Jestine
  
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  Reply
Ulises Aguilar Pazzani

November 28, 2015 at 12:24 pm

thks for sharing good information undertanding more

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thankyanebi

January 13, 2016 at 2:56 am

sir pls, i have a problem when am trying to repair a loader CD. it always blown the fuse i have use. if i plug it, it will instantly blow the fuse. i have trouble
shoot but i dont really know the problem. can you please suggest what i should do

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Reply
- Jestine Yong
  
  January 13, 2016 at 8:52 pm
  
  HI Thankyanebi,
  
  I suggest that you check the semiconductors as they are prone to failure (short circuit causing fuse to blow). If the device is using varistor, make sure it is not shorted.
  
  Jestine
  
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  Reply
chaya

April 23, 2016 at 5:50 pm

Bro Jestin, I find your articles extremely interesting especially for me as a beginner in this field.
I will keep following up

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Justice Cele

May 27, 2016 at 6:29 pm

Excellent article and very informative, thanks

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MC KARONGA

July 5, 2016 at 9:53 pm

THANK YOU SO MUCH I HOPE WILL BECOME AN EXPECT

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John

July 19, 2016 at 11:20 pm

Thank you so much for the article that you sent, I have earned a lot about it, the truth is I already repaired electronics devices here in Holland like E bike electronics controller and magnetrons and also tv's i want to share them to you, but I don't know how to send the details and photos of what I have successfully repaired, thank you so much Jestine for your help.

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Reply
- Jestine Yong
  
  July 20, 2016 at 7:20 am
  
  Hi John,
  
  You are welcome. You can send the details of the repair in Word file with few supporting photos. I will do the necessary amendment.
  
  Thanks,
  
  Jestine
  
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  Reply
Afri

September 19, 2016 at 10:26 pm

I've repaired a broken CCFL backlight 3 pin timing methods to help thank you very much

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Percy Amarasekera

November 14, 2016 at 6:14 pm

Dear Jestin,
Received your prompt reply. thank you.
My problem is that I have a 3.5kw Jotun instant heater. The control cct is burnt with some remnants remain. I would be grateful if you could give me a full cct diagram with all the parts with the values, so that I can repair it. Or else If you could supply me one for money I would be grateful.
Thanks and Regards,
Percy.

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Reply
- Jestine Yong
  
  November 17, 2016 at 8:21 am
  
  Hi Percy,
  
  Sorry I do not have the circuit diagram and do not sell parts.
  
  Jestine
  
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  Reply
Thembelani

February 26, 2017 at 5:53 pm

Your work is grateful Jestine it is helpful

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- Jestine Yong
  
  February 27, 2017 at 7:55 am
  
  Hi Thembelani,
  
  You are welcome.
  
  Jestine
  
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  Reply
Raj Kumar konar

May 30, 2017 at 10:27 pm

Nice and highly helpful for me, always trying to follow your articles.

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Sebastian

July 15, 2017 at 4:21 am

Hi, my backlight is not working anymore.. for 2 days it works just when the monitor is cold so if the monitor was off for alot of hours then the backlight works again.. but now that doesnt work anymore, i think its the transformer, but there is no label on it.. can i use any transformer? Its an 27" LG can u say me, which transformer i can use?

Here u can see the transformer: http://img1.bildupload.com/fd04a1b91e87b28e53f504e33c9add8e.jpg

I would be very happy, if u can help me

greetz

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Reply
- Jestine Yong
  
  July 15, 2017 at 5:44 pm
  
  Hi Sebastian,
  It is not necessary the transformer problem. It can be due to bad or bulged ecaps or one of the backlight already weak or even the pico fuse already open circuit.
  
  Jestine
  
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  Reply