Besides the obvious cracked screen, what causes a plasma display panel to fail?
And yes, I'm curious about failure modes of the panel itself.
And yes, I'm curious about failure modes of the panel itself.
-
-
Re: What causes PDP failure?
There are address drivers bonded along the bottom of the panel: these drive the data onto the panel. When they fail you get stuck lines/blocks. Not repairable. I'd estimate around 90% of panel failures due to this.
There are scan ribbons along one side of the panel: these can de-laminate (extremely common on 2009 and 2010 Samsung sets) causing horizontal lines to appear. Not repairable. I'd estimate <5% of panel failures due to this.
You can get a short between the scan and sustain electrodes, causing the buffer/drive board to fail (extremely common on 2007 Panasonic 1080p plasmas.) Believed not repairable, though I think it may be possible to "blow out" a short, I have not yet tried this theory. I'd estimate <3% of panel failures due to this.
You can get maldischarge due to ion implant damage in the panel. Causing a permanent misdifussion or sparklies which clear after warming up. (Extremely common on LG 2005~2008 plasmas.) Somewhat repairable, but never completely. I'd estimate <2% of panel failures due to this.Last edited by tom66; 10-28-2013, 02:30 AM.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
-
All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
-
Eventually discovered a burn mark near lower corner of LCD. Here is a summary
- Backlight on, no image
- Disconnect right buffer board (view from front), left side display comes on
- Masked off pin 7+8 (both ~12,5v on both left and right buffer board) from t-con to right buffer board (view from front) display works but have some lines
- Buffer board is pretty simple
07-11-2025, 04:04 PM -
I have a 50" Toshiba bezel-less that I replaced backlights in a few weeks ago. The tape didn't hold well so the panel started hanging from the top. The pressure caused the two bottom corners to shear off. I can see a court contact on the right corner, but the left is gone in assuming. The screen is not cracked anywhere else, but it displays no image.
Is it at all repairable? I'm assuming not.... -
49UJ6500 LCD panel has a lighter band on top when first powered on. Goes away (or gets much fainter) after TV on for a few min. After powered off for awhile and power back on, same band appears. If powered on immediately after powering off, no or much fainter band. Running the latest firmware.
Disassembled the TV and lifted the LCD panel during testing. Band is on the LCD panel (can see the band on the panel as I lift it slightly) Backlight is perfectly even at the top edge. Double checked LCD panel alignment in the frame and is perfect but since band moved with the panel, its on... -
TV flashes backlight then reboots over and over. no image. Client said it used to have image for a bit before rebooting. Got worse over time.
tcon is built into mainboard.
Only one cable goes to panel boards.
there is a cable from one panel board to the other that links them.
cost cutting measure that results in us having harder time to diagnose.
removing the link to the second panel board allows TV to stay on with stable backlight but no image.
used cut off tape method to mask 1 maybe 2 pins on the side of the cable that goes to that second panel board....
Comment