Question about Panasonic Viera TH-42PZ80U Plasma TV

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I have a Panasonic TH-42PX80U TV. When I power up the set, after a few seconds you can hear the relay click and then the LED blinks 2 times in cycle. When I hold the power button for 10 seconds the LED blinks in a 10 blink cycle. I have replaced the A and D board and I still have the same issue. I found out from the vendor who sold me the boards that they were not new boards and they have agreed to exchange them if I determine they are bad. I have a schematic and would like to verify if the power supply is bad. The schematic does not show what the voltages should be at the test points. Do you know what I need to do to determine the power supply is bad? The A board controls the power supply and it is shutting off the relay on the power supply which indicates we could have a shorted board somewhere. I have disconnected the cables to the SC and SS boards the relay on the power supply still drops out. I appreciate any feedback to determine my issue.

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Hi
A common problem for these is bad capacitors in the power supply, Remove the back from your Tv and look at the power supply on the left hand side.

You will see roughly around 9 x capacitors that are bulged / domed shaped on top usually these are valued at 3300uf 10V any that have bulged or leaked a brown like substance should be changed.
This will cure the problem as they overheat being sat next to a heatsink that gets very hot!
Try and change them for the same 3300uf but a higher voltage.
Hope this helps

Posted on Oct 04, 2010

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