Hedgehog99 is actually mentioning that he has 2 Panasonic Plasmas:
Thank you for the help
I looked at the service manual for your model, and it appears it only has two C boards, C1 and C2. Not sure how you replaced a non-existent C3 board.
Since the vertical bar is right in the middle of the screen, it could be the other C-board that is defective.
You could also check the connections from the C-boards and the panel.
This thread seems to indicate that the panel itself could be defective, as supported by these documents.
Please let us know if you happen to solve the issue.
Here is a (simulated) photo of the problem. The width of the vertical stripe is the same as the width of the flexible cable from one of the C driver boards (2 blocks.)
Here is the clip from the service manual for the C50FD18 (GPF11DU chassis)
Is Fig 1 a Front View or Rear View of the panel? I took the backing off and noticed C3 is physically located behind the black stripe. Just seems odd to me the physical placement of the driver IC/cable drives the panel pixels on the opposite side. Can someone confirm? The picture below seems to suggest that the Fig 1 service manual pic is a REAR view (though this isn't my exact Panasonic model...)
So C3 or C1? Any advice on diagnosing the issue? TIA.
Really? Well ok going by the manual C1 looks to be the suspect one for my model then. It's somewhat counterintuitive that driver circuits/cables address pixels physically located on the opposite side of the panel. Is this typical of plasma panel designs (or just Panasonic?) The 58PZ850AZ GPF11DA chassis (vs mine the GPF11DU) model from the same year (2008) shows C3 (same physical location on both chassis) as addressing the left side of the screen. Just wierd!
ERROR! (from GPF11DU chassis manual TH-C50FD18/TH-50PZ80U)
CORRECT (from GPF11DA chassis manual TH-58PZ850AZ)
Ordered a C3 board hopefully will solve my issue.
But now I have a black, vertical line, about 1" wide with a 1 pixel wide flickering green line in the black line. I have tried pulling the ribbon cable located behind the line. When I turned it on I too had a white, vertical bar about twice as wide as the black line in the same position as the black line. Cleaned the contacts. Reflowed the solder on the resistors mounted on the ribbon cable behind the metal plate holding the ribbon cable in place. Plugged it back in and there was no change.
I have been looking for information as to the likelihood that one of the C cards could fix this or if the problem lies inside the panel itself, rendering it beyond economical repair.
I appreciate any and all input.
2 weeks later another customer called and reported a single black bar at the extreme left bottom, 1-1/2" x 14" or so, installed around 08' too. We replaced that with a Sony Bravia LED LCD and what a nice picture. After waisting money attempting a repair on the last set i didn't bother with this one. I mounted it in my office and connected it to my PC and since the bar was at the extreme last i reduce the H-size and V-size and turn off side bars now I can program in style with my 2, 22" and 1, 65" (now 62") monitors.
I don't think i'll be purchasing Panasonic Pro plasma anymore for clients. They're too freakin heavy anyway and it's time for LED displays but not Panasonic.
Based on you saying you were having problems with only half the picture and then the symptoms changed, you may try a T-con (timer control, control, or even called a logic board in some sets). This would be a board that generally has a couple ribbon connectors attached to the boards at the bottom of the panel.
Your disconnecting of the panel ribbons and creating the 3 inch wide columns, with both columns looking the same, may indicate the panel is working OK.
My question is is the C1 board faulty or panel is dead.
I changed the c1 buffer board but the same black line is on my panasonic plasma.
I was thinking about buying an A board to try to fix it?
Is there a way I can test the A board before I buy another one to see if it is causing the black line?
I have a Panasonic P55GT30, it developed a vertical black bar. Did some reading here, and it was on the CB13 section (3rd from the left). I installed a new C3 board and now the CB13 section is fine, but the CB12 section is black (4th from the left). Is the new C3 board faulty or should I replace a different module?
Perhaps flexing the ribbon cable during installation reestablished the faulty connection? If there is a fault on the ribbon cable itself, the whole panel is considered defective.
This to me would indicate a board issue. It's a shame because the rest of the panel is perfect, if a little heavy. I will probably look at the C board replacement and see if the issue is fixed 😃
|Panasonic Th 42px80u|