Folks I need your help once again. I have the above mentioned TV that shuts down about a second after power up. Get two blinks on the power LED. This is 15V(P) DET code. When the set is plugged in, the 15V powers up at 15.8V, then the relay clicks, voltage drops to zero. Power set up, read 15.8V on supply at test point 7, then set shuts down within a second or so.
The service manual says to check the D board for this error code. I have checked pretty much all components associated with the 15V supply on the power board, and found nothing wrong. My question is, is the set shutting down due to over voltage of 15.8V? This info isn't listed in the manual I have. I pulled the D board and checked a couple of resistors at the panel MICOM IC where the 15V is supplied, where I believe the error is being detected. Nothing found wrong. I can't check voltages on the D board since you can't access it without removing another board from the chassis (A board I think), which won't allow set to power up.
I hate to trash this one, and am willing to replace a board, but hope someone in this group familiar with plasma's or Panasonic can give me some pointers of what/where to check. What do the pro's do to find this kind of problems? I am not a pro repair person, but have been working on TV's as a hobby for about 7 years. Much thanks to all. Best regards.