Samsung LED TV Auto Change Channel Repair
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.
Once the cover was opened, I could see few boards but the most important boards are the mainboard and the power board.
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:
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.
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.
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.
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:
https://jestineyong.com/how-to-repair-led-tv-backlight-problem-no-picture/
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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!
suraga Electronics
January 28, 2017 at 1:50 pm
Hi. Mr,mark,
Thanks !
Tito Kanshulu
January 27, 2017 at 3:25 pm
Nice and tactical job Suranga. Well done.
suraga Electronics
January 28, 2017 at 1:57 pm
Hi, Thanks Mr.tito.
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
suraga Electronics
January 28, 2017 at 1:58 pm
Hey..
Thanks ! Mr.Weleed.
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.
suraga Electronics
January 28, 2017 at 1:53 pm
Hi,
Mr-Albert van,
Thank you !
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.
suraga Electronics
January 28, 2017 at 1:54 pm
Hey..Ifa..
Thank you !
Ulises Aguilar Pazzani
January 28, 2017 at 9:50 am
Mr Suranga, happy new Year good information
suraga Electronics
January 28, 2017 at 1:55 pm
Hi Mr,Ulises,
Same to you !!!
Thanks !
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!
Samsudeen
January 28, 2017 at 8:59 pm
Thank you the article. very nice job
Kushan
January 30, 2017 at 5:48 pm
it's an informative article Suranga. It's simple but successful attempt. Congratulation!
Yogesh Panchal
February 1, 2017 at 4:59 pm
Suranga,
Thanks for useful tips.
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
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,
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
Afrim
July 6, 2017 at 8:44 pm
I'm very good at electronica and I have to go this way
Rupesh Dahake
August 2, 2017 at 6:01 pm
Nice job