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Polytron LED TV Repaired
The complaint of this Polytron LED TV was no picture and no light but there was sound. When I used a torch light to shine at the panel, i could see dim picture.
This means the power supply, mainboard and even the panel are working fine. The problem is in the LED driver board or problem with the LED backlights.
I had to damage the warranty sticker in order to remove the screw and the cover
Below is the photo of the internal power supply/LED driver board and the mainboard.
Since there was a correct output voltage from the connector (36.8vdc) this means the problem is in the LED backlights. I had to gently remove the internal casing/cover in order to check on the LED backlights. Remember to take picture or record how you dismantle the panel part as fixing it back is not a straight forward job.
After fixing back the connector and Powered On this is what I saw- all LEDs light up.
So I fixed back everything and the LED TV came back to life. If you want to learn how to repair LED Tvs you can check out Kent and Damons’ ebooks:
This article was prepared for you by Suranga Bandara who owns an Electronics shop in Anuradapura, Sri Lanka.
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Note: You may check out his previous repair article in the below link: