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Without the Right Tools It is Difficult To Fix Equipment

By on February 22, 2021
lcd tv repair picture problem

lcd panel fault

This BG 32″ LED TV with the model 32E38 came in for repair with the complaint of display screen problem-see the above picture. Screen problem usually caused by defective T-con board, bad LCD panel and the FPC cable either has loosen, spoilt or disconnected. Once the cover was removed I head straight to the T-con board to see any unusual problem on the components such as burnt parts, loosen cable and etc.

But all seems to be in good condition.

tcon board lcd tv

Now, I detached the right side FPC cable as shown in the photo below to isolate the problem.

fpc cable in lcd tv

There was no fault after I have detached the right side of the FPC cable It has proven the LCD panel was in good condition because I could see part of the picture clearly.fpc cable in lcd tv picture problem

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Next I removed the left side of the FPC cable while connected back the right side FPC cable, see the photo below:

fpc cable in lcd tv picture problem fixing

There was no  picture at the right side of the screen once the left FPC cable was removed. This has proven that the right side of the screen have problem.

Screen problem not necessarily must be the fault of a bad LCD panel, it can be caused by bad Tab bonding and the COF (chip on film).

how to fix lcd tv picture fault

If you look at the photo below, I do not know how  to explain this when both the FPC cable were connected. But surely there is something not right at the screen panel circuitry.

picture problem in lcd tv

When I opened up the bottom area I could see some burnt mark at the Tab bonding/COF area and I believe this is the main cause of the problem.

tab bonding in lcd tv problem

cof fault in lcd tv

Conclusion- I gave up on this repair work because I do not have the TAB  COF ACF LCD bonding machine. It is not cheap for this big machine.

Without this tool I can’t fix a new part in it. If you can fix this part successfully (100 %) without the TAB COF ACF bonding machine kindly share it in the comment section below. By the way you can take a look at the video below to see how new parts can be fixed :

suranga

This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.

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8 Comments

  1. Albert van Bemmelen

    February 22, 2021 at 1:48 pm

    That is only one of the reasons why fixing those modern televisions is no longer doable like it was in the crt television days. And it indeed requires new tools like expensive new bga chip mounting equipment and new bonding tools. And those larger glass screens are way too breakable to even consider to replace them.

    Likes(9)Dislikes(0)
    • Paris Azis

      February 22, 2021 at 3:39 pm

      I fully agree Albert...

      Likes(2)Dislikes(0)
  2. Yogesh Panchal

    February 22, 2021 at 7:01 pm

    yes now in repairing business some investment is necessary major parts are Good HDMI Microscope camera with large wall screen and Thermal camera for finding hot shorted Microscopic components on PCB like Laptop / Mobile motherboards.

    Likes(3)Dislikes(0)
  3. Parasuraman S

    February 22, 2021 at 10:20 pm

    Very good reason for giving up! We cannot afford to handle such cases! Thanks for sharing, which many might not be ready to do!

    Likes(3)Dislikes(0)
  4. Anwar Shiekh

    February 23, 2021 at 12:23 am

    One needs to know when to abandon a repair, it is part of the art.

    Likes(2)Dislikes(0)
  5. Lawrence Pina

    February 24, 2021 at 12:51 am

    Just curious - did you you try bypassing/opening those lines? You were going to give up on it anyway, so nothing to lose. I'd have tried it!

    Likes(0)Dislikes(0)
  6. jose armando sanchez valdez

    February 25, 2021 at 5:26 am

    bueno en casos con esta falla pues no se puede hacer nada.mas que regresar la tv..y seguir adelante con otras reparaciones de tv pantallas lcd...
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    good in cases with this failure because nothing can be done, but to return the tv ... and go ahead with other repairs of tv lcd screens ...

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  7. JOHN MIMS

    February 27, 2021 at 1:15 am

    I agree that an expensive piece of equipment is needed. Coincidentally, this is giving an advantage to the mulinational corporate industry in the electronics business, leaving small repair shops struggling to compete. Has anyone thought of chiping in and buy some equipment to share it to obtain one ?

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