I have a Panasonic TH-42PX75U plasma (May 2007 manufacture date) that once again will not turn on whatsoever, no blinking LEDs at all. I say once again, because I fixed this problem back in January and the TV ran great for a week or so, now it won't power on and both fuses are blown on the Power Board. I used a fix it kit I got on eBay (Item# 130701809472), which included a new Q406 transistor and 2 new fuses. I got the TV to work, but I had a little problem when I installed the Q406 transistor onto the board, the 3 prongs were a little too wide for the eyelets on the board and I tried to bore out the eyelets with a 1/16" drill bit, but to my dismay, 2 of the 3 eyelets for the transistor broke apart, thus leaving the bare motherboard. However, I was able to solder the new transistor to the board. Does anyone think this may have caused the board to fail? Due to the 2 missing eyelets? Are they a critical part of the circuitry?
I should mention the TV has been sitting in my front room, unused, since mid January (since it was working). This was due to my Dad purchasing another plasma and we really had no need for the affected Panasonic plasma until now. I turned it on a couple days ago (with a surge protector) and it ran fine for a good 20 minutes until all of a sudden it blacked out. I tried turning it on via the power button on the front left corner and nothing! Just dead. Having previously experienced this, I knew the fuses were blown and I was back at square one.
So I was hoping someone here has gone through this and found that replacing the entire power board (TXN/P1HNTUS, aka TNPA4221AB) will solve my problem?
I found the board for $100 shipped through tristatemodule.com with a 6 month warranty, but I'm just hesitant to buy this and have it be another component, such as the A board (which I've heard could be a problem). Spending $100 and not fixing the problem would not make me happy.
If there's anyone who could help me out with this, I'd really appreciate it. I don't know what to do at this point, I don't want to throw the plasma away, since it only has this 1 problem.
I'm going to go and read as much through this thread as I can, try and gauge an understanding as to why this happens.
I have a 2005 and 2006 Panasonic plasma set that are still running like champs, no problems at all (knock on wood). It seems these 2007 models have a very high failure rate from what I've researched.
Any help would be greatly appreciated, I currently have the plasma sitting on a dresser with the back cover off, and not knowing if my power board is faulty or not is driving me nuts! I just want to fix this thing and keep it fixed.