Samsung LED TV Auto Change Channel Repair

By on January 27, 2017



SAMSUNG tv auto change channel repairing

 

 

 

 

 

 

 

 

 

samsung led tv auto change channel

Customer sent to me this 32″ LED TV with the complaint of auto change channel (and power LED blinks) even though you did not press on the remote control and the front panel control.




This means the problem has nothing to do with the remote control. In the above picture you see channel 14 but actually it was counting/running 15 then 16 and etc. Below photo is the LED TV model LA32D400E1MXXS.

samsung la32d400e1m tv repair

Once the cover was opened, I could see few boards but the most important boards are the mainboard and the power board.

samsung led tv auto change channel repair

samsung led tv mainboard

In order to confirm is the mainboard fault or the front panel touch keys fault, I had to remove the touch keys connector as shown below:

samsung led tv touch key panel

Once the touch keys connector was removed and power On, the problem disappeared. If you look at the photo below, there was no running channel. From this test I concluded that it was the front panel touch keys board problem.

SAMSUNG tv auto change channel repair

When I opened up the touch keys board I got a shocked to see rusted circuit board. Probably it was caused by dripping water and it takes time to develop into this kind of rusted condition.

how to repair tv auto change channel

I then cleaned up the circuit board and reflowed the IC and the SMD components. Once done I powered up the TV and no longer can see auto change channel in the screen. Problem solved.

amtech cleaning solution

tv front panel repair

how to fix tv auto channel problem

 

suranga

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




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Note: You may check out previous post about fixing active speaker in the below link:

http://jestineyong.com/how-to-repair-led-tv-backlight-problem-no-picture/

 

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19 Comments

  1. Mark

    January 27, 2017 at 12:06 pm

    Hey Suranga,
    Thanks for the article. I haven't heard of that problem before, but corrosion and rust can cause all sorts of weird problems.
    Well done!

    Likes(3)Dislikes(0)
    • suraga Electronics

      January 28, 2017 at 1:50 pm

      Hi. Mr,mark,

      Thanks !

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

    January 27, 2017 at 3:25 pm

    Nice and tactical job Suranga. Well done.

    Likes(2)Dislikes(0)
    • suraga Electronics

      January 28, 2017 at 1:57 pm

      Hi, Thanks Mr.tito.

      Likes(0)Dislikes(0)
  3. Waleed

    January 27, 2017 at 4:50 pm

    recently I ordered this kind of flux and it works like a charm. good job on the repair. keep up the good work

    Likes(2)Dislikes(0)
    • suraga Electronics

      January 28, 2017 at 1:58 pm

      Hey..
      Thanks ! Mr.Weleed.

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

    January 27, 2017 at 6:12 pm

    ProJob Suranga! Thanks for the article. Hotfixing and or worse reballing are things which I myself try to avoid. Like you I once managed to fix a Laptop by Hotfixing the VGA videochip on board by only using a Hot-air gun. But it is always tricky business. So I only do this if I'm sure nothing else will fix it. And I also use it together with my portable 9V IR contactless temperature meter in these cases to be sure I do not overheat the BGA Chip.

    Likes(2)Dislikes(0)
    • suraga Electronics

      January 28, 2017 at 1:53 pm

      Hi,
      Mr-Albert van,
      Thank you !

      Likes(1)Dislikes(0)
  5. ifa

    January 27, 2017 at 11:25 pm

    Nice work Suranga. You've been doing great so far. I'm also here in sri lanka in trinco.

    Likes(1)Dislikes(0)
    • suraga Electronics

      January 28, 2017 at 1:54 pm

      Hey..Ifa..

      Thank you !

      Likes(0)Dislikes(0)
  6. Ulises Aguilar Pazzani

    January 28, 2017 at 9:50 am

    Mr Suranga, happy new Year good information

    Likes(0)Dislikes(0)
    • suraga Electronics

      January 28, 2017 at 1:55 pm

      Hi Mr,Ulises,
      Same to you !!!

      Thanks !

      Likes(0)Dislikes(0)
  7. PARASURAMAN S

    January 28, 2017 at 10:39 am

    Tempt me however much, I will never never venture to reflow on such tiny and thin boards and components! Hat's off to your intricate and delicate service!

    Likes(1)Dislikes(0)
  8. Samsudeen

    January 28, 2017 at 8:59 pm

    Thank you the article. very nice job

    Likes(0)Dislikes(0)
  9. Kushan

    January 30, 2017 at 5:48 pm

    it's an informative article Suranga. It's simple but successful attempt. Congratulation!

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

    February 1, 2017 at 4:59 pm

    Suranga,

    Thanks for useful tips.

    Likes(0)Dislikes(0)
  11. Ariel Mirabueno

    February 2, 2017 at 12:48 pm

    anybody can help my LG LCDTV encountered automatic shut down sometimes no sound when we use antenna but we use audio video no problem encountered..my suspek the system board defective

    Likes(2)Dislikes(0)
  12. Akbar Hazara

    February 4, 2017 at 1:16 pm

    Nice job Mr.Suranga I also encountered the same type of symptom in a 17" samsung lcd tv. cleaning the keyboard with aresol solved the probem in no time. Thanks,

    Likes(0)Dislikes(0)
  13. zaheedi farjan

    February 11, 2017 at 12:46 am

    Hello suranga zaid here first of all great job really am experiancingmyself a lot thank u a lot plse could u tell me what paste or anything i need to clean pcb n how to resolder smd parts without blowing off other parts
    Regards
    Zaid

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