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I got out of the repair biz years before flat screens came out, but I have a friend who is still working at a TV shop. He told me that outside of replacing bad electrolytic caps or an open resistor, there's not much that can be repaired on the LCD sets. He did say they done a lot of "board swapping" (if they can even get a replacement board).
It makes sense to me. On CRT sets, the lion's share of problems come from the power supply and high voltage section....on the new flat screens, there is no high voltage for the CRT anode.
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