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Four Different Cases Of Backlight Issues

By on January 20, 2023
led tv repair

 

 

 

 

 

 

As mentioned by me before in a few articles, these are cases which I attended to in my friends’ shop. I am sharing this with brief description and pictures for those who are interested in knowing the issues, resolutions and also to have view of the inside of the sets.

Case 1:- Make: Haier – Model: LE32M600C – Complaint: Low glow at bottom

haier led tv repair

After opening the set and checking the backlight with an LED tester and also the output of the LED driver on the board, it was confirmed that the issue was with the backlight. So, removed the panel and replaced the backlight.

led tv backlight issue

After replacing the backlights, the issue was resolved, as you can see from the following picture:

how to fix led tv

Case 2:- Make: Panasonic – Model: TH-24C400DX – Complaint: No backlight

In this case, it was detected that the LED Driver was defective, as the backlight was ok when checked with the backlight tester. As it was a combo board, the best solution was to provide an LED inverter board. The 12V supply and ground was tapped from the combo board.

The power on was taken from pin 10 of the inverter IC. This universal LED Inverter board had multiple connections in the output and the appropriate output suitable was selected. Just see the connections:

fixing led tv with backlight problem

After checking all work done, when the set was switched on, it worked perfectly well:

how to fix and repair led tv

Case 3: Make: Videocon – Model : LWDTWKC40FH-ZMA – Complaint: No backlight

After doing the preliminary checks of backlight with the LED checker, the focus was turned on to the inverter board. Indeed a completely dry soldered transformer was found.

dry solder transformer

After cleaning the area very well, fresh solder was applied and when the TV was tested, it worked very well:

testing led panel screen backlight

Case 4:- Make: Videocon – Model : V3218LEDTV – Complaint : Blinking backlight

This Videocon TV belonged to my colleague in the Hospital, and was the one in which the panel was changed. Subsequently, it developed a problem with the backlight and the Mosfet was changed by my friend, as the panel change work was done in his shop.

Again it came to his shop, as per my directions and when I opened the set; I noticed that the LED driver itself was having a problem. It was switching on and off. Instead of wasting time on troubleshooting the board (as per his shop policy), an LED driver board was fixed on top of the heat zinc using the screw of the Mosfet as fastener.

led tv board backlight fix

The 12V supply, ground and power on was taken from the board.



The TV was found working very well after doing this bypass surgery!

how to fix a broken led tv

Thus missions accomplished and satisfactions got collected!

Parasuraman

This article was prepared for you by Parasuraman Subramanian from India. He is 72 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.

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You may check on his previous article on Fuse Blown And Power On LED Found Short In NORGE 2060 Amplifier

 

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18 Comments

  1. AJAYAKUMAR SOMADETHAN

    January 20, 2023 at 11:37 am

    Thanks for sharing your experience

    Likes(2)Dislikes(0)
    • Parasuraman S

      January 20, 2023 at 1:56 pm

      Many thanks!

      Likes(0)Dislikes(0)
  2. Albert van Bemmelen

    January 20, 2023 at 1:41 pm

    The last mentioned repair with the led driver bypass was the most interesting fix. Sadly you didn't mention the exact type of led driver board that was used. Which would have made it even more interesting in case one would need such a led driver board too.

    Likes(3)Dislikes(0)
    • Parasuraman S

      January 20, 2023 at 10:38 pm

      That was a board given to me by my friend. Anyhow, these boards are commonly available in this part of the country. Many thanks for your comments!

      Likes(1)Dislikes(0)
  3. Waleed Rishmawi

    January 20, 2023 at 8:46 pm

    thanks for sharing your experience. have a blessed day

    Likes(1)Dislikes(0)
    • Parasuraman S

      January 20, 2023 at 10:38 pm

      Many thanks, dear friend!

      Likes(0)Dislikes(0)
  4. ANIL KUMAR V K

    January 20, 2023 at 11:07 pm

    Thanks for sharing

    Likes(2)Dislikes(0)
    • Parasuraman S

      January 21, 2023 at 11:12 am

      Many thanks!

      Likes(0)Dislikes(0)
  5. Babu M S

    January 20, 2023 at 11:52 pm

    Many thanks for at a time your shared four cases.May please give details of led driver.

    Likes(1)Dislikes(0)
    • Parasuraman S

      January 21, 2023 at 11:13 am

      LED driver boards are easily available in the market. There are universal boards too with multiple pin connectors! Kindly get in touch with your local shop! Many thanks!

      Likes(0)Dislikes(0)
  6. James A. Webb

    January 21, 2023 at 1:02 am

    Thanks. I had not heard of a universal LED Inverter board. Will look this up.

    Likes(1)Dislikes(0)
    • Parasuraman S

      January 21, 2023 at 11:14 am

      Yes, you should! Many thanks for your comments!

      Likes(0)Dislikes(0)
  7. Tito Kanshulu

    January 21, 2023 at 1:32 pm

    Thanks for the experience shared Mr Parasuraman. We have picked one or two things from the articles.

    Likes(1)Dislikes(0)
    • Parasuraman S

      January 21, 2023 at 7:47 pm

      Glad to know! Many thanks for your comments and encouragement!

      Likes(0)Dislikes(0)
  8. Yogesh Panchal

    January 27, 2023 at 2:08 pm

    Good job!sir,
    This is called hunger of passion with dedication.

    Likes(1)Dislikes(0)
    • Parasuraman S

      January 28, 2023 at 4:48 pm

      Many thanks!

      Likes(0)Dislikes(0)
  9. Mike retz

    January 30, 2023 at 8:24 am

    Hi reminds me of 6.3 volt booster xfmr for old crt sets. They called it. Bomb and would boost the 6.3 bolts on crt filament to about 7 volts when crt was bad.would hang off crt socket! Some were so big it would pull plastic cap off crt. Those were the good old days when cust didn't want to pay for new crt..21ap22 25xp22 etc. Thanks for great articles. Your the best. Mike USA..

    Likes(1)Dislikes(0)
    • Parasuraman S

      January 31, 2023 at 7:54 am

      Many thanks for your comments, encouragement and sharing of your experience!

      Likes(0)Dislikes(0)

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