BACKGROUND: I have a Panasonic Th-46PZ85U. I have the 2 blinking lights as described above too. I downloaded the technical guide found in the link, but was unsure of my multimeter skills, since it has been a over a decade since electronics labs in university, so I called in two not-so-bright techs. They didn't have the technical guide and followed some other troubleshooting procedure to narrow it down to either the D or A Board; they said they detected the 15V, which rules out the P Board according to the manual. I played the 50/50 odds and ordered a D board and replaced it but still had the problem. I switched it back to the original with no changes in luck. At this point, my TV worked half the time. I didnt want to pay $700 to fix my TV, so I just lived with the occasional outage. One month later, the TV doesn't turn on at all. Time for action!
I bought a multimeter and am going through the steps (Pg 9-11) but I need some help. For step 1: The resistance of P7 pin measured to 1.6K ohm, does that mean a short circuit? I went through all the steps and saw the following range of resistances: 1.6, 3.2, and 20. Looking at such big differences, I want to say that "yes" was the right answer for step 1, but I guess I am not sure. How low of resistance tells me there is a short circuit?
If I say "no", the next step is to plug in the TV, turn it on, and measure P7 pin 1: I did not read 15V AC, it only got up to 3V and the fans moved briefly before the TV started the 2 blinking lights thing. This tells me it is the P Board.