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It can be the main board or the power supply,
look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc. http://en.wikipedia.org/wiki/Capacitor_plague Please post back what you find
This problem is likely a failed power supply. This is a known issue
with this model TV. It will normally occur soon after the warrenty
expires. It can also be caused by a voltage surge produced by a power
failure. You might wish to unplug the TV for an hour or more. If this
power reset does not allow the TV to turn on component failure is
indicated. These sets are assembled using the wave soldering process
they are known for having cold solder connections. The safety circuitry
shuts the TV set down or will keep it from turning on when it detects a
problem. This model of TV has over 2,000 parts, which includes millions
of transistors inside the integrated circuits. The capacitors will
change value, leak and become defective. Resistors will change value
and burn. Diodes and IC can go bad. This may have a domino effect and
cause other parts to fail. Replacing one defective part may make the TV
operate for a short time but the part will fail again if the parts that
caused the failure to begin with are not replaced. The only way to know
for sure which parts that are no longer within factory specs and for a
proper repair all the electronics must be diagnosed by someone with the
correct electronic test equipment specifically designed for TV service
and the skills to use the test equipment. I wish I could tell you there
was a quick fix or button to push that would fix the TV but that is not
the case or the solution needed to get the TV operating correctly.