Very odd, this one. I really hope someone can help me figure this one out and bear with my lengthy story, which I hope at least helps.
Full model: PN60F5500AFXZA
version: US01
Symptom: No picture, audio okay.
Detail: Brief flash from panel around edges, but doesn't stay lit.
What I found: Opened up the set, measured VS and VA, (this is where I'm questioning my sanity) because I swear they didn't come at all or started to and went down long before reaching correct voltage, but now I'm questioning whether I'm remembering this wrong, even though I thought I was very certain how it acted. Anyway, this model doesn't seem to have a relay, so there is no clicking and there is a red power LED that flashes a few times when the TV is plugged in, but not repeating; I think this is just the normal flashing LED upon start up. Also, this model doesn't have a logic board, but the main board has a very slow flashing green LED near the center of the board.
I then unplugged the power cable to the Y-Main and found that the VS and VA both came ALL THE WAY UP when TV plugged in, but immediately started dropping down to nothing, which is probably normal, but to me, would say that Y-Main was loading it down and causing it to not come up at all or drop much sooner as I thought I had found.
What I've done: So, I ordered a new Y-Main after pulling and checking the buffers and finding no shorts.
Results found after replacing Y-Main: The TV is acting the exact same way, the same symptoms as with the original Y-Main. Checking VS and VA shows them voltages coming ALL THE WAY UP and then dropping down. Unplugging Y-Main from power supply doesn't change that; the VS AND VA still come all the way and then drop.
What I tried next: I put the original Y-Main in and rechecked the VS AND VA and now I'm baffled. It's checking exactly like the replacement Y-Main: VS and VA come all the way up and then drop. The thing is, like I said earlier, I could have sworn the first time I did this check, the VS AND VA only partially came up or didn't come up at all and now I'm starting to doubt myself because of the length of time since I had made the first check, and yet again, I thought I verified and was certain in my mind.
So, now I dont' know what to do.
what I did next: I pulled the buffers again and recheck them: still good, reinstalled them. I pulled the power supply/X-Main (it's combined on this model) and checked for bad connections, soldered a few weak points, reinstalled. Symptom is still them same.
Any idea what I should try, check next?
Full model: PN60F5500AFXZA
version: US01
Symptom: No picture, audio okay.
Detail: Brief flash from panel around edges, but doesn't stay lit.
What I found: Opened up the set, measured VS and VA, (this is where I'm questioning my sanity) because I swear they didn't come at all or started to and went down long before reaching correct voltage, but now I'm questioning whether I'm remembering this wrong, even though I thought I was very certain how it acted. Anyway, this model doesn't seem to have a relay, so there is no clicking and there is a red power LED that flashes a few times when the TV is plugged in, but not repeating; I think this is just the normal flashing LED upon start up. Also, this model doesn't have a logic board, but the main board has a very slow flashing green LED near the center of the board.
I then unplugged the power cable to the Y-Main and found that the VS and VA both came ALL THE WAY UP when TV plugged in, but immediately started dropping down to nothing, which is probably normal, but to me, would say that Y-Main was loading it down and causing it to not come up at all or drop much sooner as I thought I had found.
What I've done: So, I ordered a new Y-Main after pulling and checking the buffers and finding no shorts.
Results found after replacing Y-Main: The TV is acting the exact same way, the same symptoms as with the original Y-Main. Checking VS and VA shows them voltages coming ALL THE WAY UP and then dropping down. Unplugging Y-Main from power supply doesn't change that; the VS AND VA still come all the way and then drop.
What I tried next: I put the original Y-Main in and rechecked the VS AND VA and now I'm baffled. It's checking exactly like the replacement Y-Main: VS and VA come all the way up and then drop. The thing is, like I said earlier, I could have sworn the first time I did this check, the VS AND VA only partially came up or didn't come up at all and now I'm starting to doubt myself because of the length of time since I had made the first check, and yet again, I thought I verified and was certain in my mind.
So, now I dont' know what to do.
what I did next: I pulled the buffers again and recheck them: still good, reinstalled them. I pulled the power supply/X-Main (it's combined on this model) and checked for bad connections, soldered a few weak points, reinstalled. Symptom is still them same.
Any idea what I should try, check next?
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