Though my profile shows me as an extreme newbie, I've been reading and learning from this forum for years. In fact, it's precisely because of the wealth of info on here that I HAVEN'T posted anything.
But now I've got an issue I just cannot figure out and it's driving me nuts. I've got the 50" version of this TV. Let me say up front that this is NOT the usual capacitor issue. I fixed that about a year ago (thanks to this forum!).
Before I get into the problem, I've got the service manual for this series of plasmas (multiple sizes). I've never seen anyone offer it for download or refer to it anywhere, so here it is. It's on my own server, so it won't disappear unless I accidentally delete it. Hope it helps someone.
I'd attach it to the post, but the file is too big.
Ok, my problem has the following symptoms:
1. Front LED is green (always)
2. No picture on screen
3. Ambilights work fine and react to the 'invisible' picture
1. All voltages coming from the PS are as they should be
2. Power supply has all three green LEDs lit
3. Main Logic board green LED blinks as usual
4. Main SSB board has green LED as usual
Things I've done:
1. Service guy said it was probably the Y-sus and possibly the Y-buffers
2. I replaced the Y-sus -- no change
3. Replaced the Y-buffers -- no change
4. Replaced the SSB -- no change
5. Replaced the Main logic board -- no change
It was at this point that I stumbled across the service manual online, which is fairly helpful with a troublshooting flowchart and test instructions. In going through that procedure, I discovered that my REPLACEMENT Ysus had a bad fuse at F5001 (hadn't noticed this tiny thing on my own). My ORIGINAL Ysus fuses were all fine. So I just moved the fuse from my old board to the replacement board.
So at this point, I figured I would put ALL of the replacement parts in the TV and if it worked, start putting the old boards back in there one by one until it stopped working again, which would tell me for sure what went bad, resell the boards I didn't need, and move on in HDTV bliss, having fixed my own TV for the second time, etc. etc.
Well, when I did just that and powered it up, the screen did indeed finally light up but with a bunch of [mostly] pink snow.
I hit the MENU button and the Amblights perked up as usual but no menu on the screen, just more pink snow. It was about this time that smoke started rising from the area of the Ysus.
I powered it off immediately, of course.
Now I'm stuck. I'm afraid to try it again because obviously something is not right, I just have no idea what!
Any brilliant minds out there with some ideas? I'm at a loss.