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32 inch LG Television Model 32LH20R Dead, Now Repaired

By on June 23, 2021
lcd tv repair

 

 

 

 

 

 

 

I received a phone call from my neighbor who wanted his television checked by a technician. I passed by his place, ushered in and shown the television. I applied the power and television was dead with no sign of life. I decided to take the machine to my workshop for further testing. Once on the workbench I opened the Television and once the cover was removed I decided to begin by troubleshooting using my eyes and therefore scanned the three board, Power board, motherboard and the inverter board as can see here below.

how to fix 32 inch lcd tv

I was not happy with the power board since I noted two capacitors with top

part slightly swollen and this is not good sign for capacitors as you can see below.

how to repair lcd tv no power

I replaced the two capacitors and since they are used to filter the inverter circuit line, I have high hopes that this could cure the problem. After replacing the two capacitor rated 1000uF/35v with 1000uF by50 volts, I decided to power the machine and check the progress. I noted the machine is now powering on but shut down immediately.

I checked the ESR of all the capacitors on the power supply, motherboard and inverter board and all tested okay. I decided to pursue the inverter circuit since the faulty capacitors were filtering that line and everything seemed okay according to my meter.

I decided to concentrate more on the inverter high voltage transformer and all looked okay to my eyes, no burnt areas or coils. I therefore decided to check the health of each transformer using my homemade fly back tester and I found one transformer where the fly back tester did not have any lights. I pulled my meter and tested the primary coil and was found okay, I tested the two secondary output and found one output was open circuit.

inverter lcd tv open circuit

I found the coil was open just near the connector and did the connection using a very thin wire.



I once again decided to re-test and see if there is any progress and this is what I saw. The television came back to life smiling and praising for another chance to live.

how to fix lg lcd tv with no power symptom

Thank you guys

Stay safe

humphrey kimathi

Humphrey Kimathi is from Nairobi Kenya and the author of:

1) Lcd-Led television repair guide

2) Microwave Oven Repair Made Easy

2) DVD Player repair guide

3) CRT Television repair course

4) Basic Electronics Course For Beginners

5) Basic Electronics course.

He is also a blogger at Electronicsrepairmadeasy.com

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Note: You may check out his previous post on Samsung LED TV Repair

 

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5 Comments

  1. Albert van Bemmelen

    June 23, 2021 at 12:48 pm

    Nicely done fix Humprey! These HV transformers luckily will become lesser used because newer LCD Led-backlit models obviously no longer need those.

    Likes(5)Dislikes(0)
  2. Parasuraman S

    June 23, 2021 at 2:00 pm

    Well done, dear! 'The television came back to life smiling and praising for another chance to live', well that says it all!

    Likes(4)Dislikes(0)
  3. Lewis Spedding

    June 23, 2021 at 6:54 pm

    Well done Humphrey. I have done a similar inverter transformer check with an LCD TV. If I remember the secondary resistance output should be approx 900-1k ohm. Great repair

    Likes(2)Dislikes(0)
  4. Babu M S

    June 23, 2021 at 9:51 pm

    Fantastic repair work learned from your article.Thank you very much for sharing.

    Likes(1)Dislikes(0)
  5. Yogesh Panchal

    June 28, 2021 at 4:21 pm

    Good JOB! Sir

    Likes(0)Dislikes(0)

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