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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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