Chosen Solution
Model: Panasonic TC-P50X1 Service Manual PDF: https://data2.manualslib.com/pdf5/110/10… Service Manual Source(web version): https://www.manualslib.com/manual/109176… Backstory: Got this TV from a friend, TV did not turn on initially, no signs of power. First thing I did was checked fuses on the p board(power supply) and it seemed one of them had blown. (Did some research and it seems this model of TV has problems with power surges blowing the p board.) I order the same exact fuses and re-solder a working one in place. Plug TV in and it turns on! Problem is now nothing shows, just back light, Symptoms of power on explained below. Power on symptoms: Power button pressedBack light and red LED turn onDelayBack light turns off, red LED still solid red.DelayBack light turns on permanently, red LED still solid red. No blink at all during power up. Research i’ve done: I did some research, trying to see if anyone else had this problem. There was a few people that had similar problems but none of them were the same problem I had. I ended up finding a service manual for the TV. I found a flow chart on Page 15 which I followed. I since there is no OSD(On screen display) it says the problem is with the A board. Reason for question: I am 50% certain that it may be the main board or the “A” board problem. I am not sure though and have no other way of checking (at least that I know of). If anyone has experience in this situation and can maybe make sure that I am correct in my assumption that would be fantastic. I want to be completely sure that this is definitely the problem and I will go ahead and buy a new board. I love to learn and if there is any techniques I should use to solve this problem please let me know, I would love to learn a thing or two from you experts! If there is anymore information that I may have missed that is needed to help me, please notify me! UPDATE: I checked the Stand by voltages and the normal running voltages being output from the P board to the A board, and they all seem to be functioning well.
Unfortunately, the power incident that blew the fuse seem to have taken a board with it. Fuses are nowhere near fast enough to prevent semiconductor parts damage. If the “A” board is primary control (buttons, etc), I’d agree with the manual.
