Panasonic Plasma horizontal lines after repair attempts

[dolt]

Greetings all,

I've been trying to repair a Panasonic plasma TC-50PS14 for some time now. I originally got the dreaded "bang" and 10 blink flash code. Well I'm a glutton for punishment and have replaced many of the main boards in the back, including the SC board, SU, and SD (among others). I did notice that there was a burn mark on the old SC board, so replacing that was probably a good idea.

I now can turn the TV on without any blink codes, but there are some horizontal lines through the picture. I'm really at a loss as to what to do next. I've triple checked that the ribbon cables are correctly seated into the SD and SU boards and have no idea what else to do.

Please, someone help before I throw this thing out the window. Here's a crappy picture of what the TV screen now looks like:

[tom66]

Re: Panasonic Plasma horizontal lines after repair attempts

I all but guarantee you the ribbon cables are bad. Panasonic ribbon cables are a bastard to get right. This is exactly what many people's sets look like with loose/poorly seated ribbons.

My favourite method: remove all the dodgy ones (power off while making any connector changes!) Install the cable making sure you do not bend or twist the cable and making sure it is perfectly aligned. You should hear or feel a faint click when it is in right. There are two positions, and one is the wrong one, the other gives the click.

[dolt]

Re: Panasonic Plasma horizontal lines after repair attempts

Tom,

Thanks for the reply. I'll try again to reseat those ribbon cables. If it is indeed the ribbon cables not being seated correctly, do the locations of the vertical lines roughly coincide with the bastard ribbons?

Also, if I somehow damaged one or more ribbons, am I correct to assume the TV is basically destroyed and should be parted out?

[Shinju]

Re: Panasonic Plasma horizontal lines after repair attempts

I would also clean those ribbon cable ends too with some contact cleaner for electronics. Sometimes debris get in there and corrosion builds up and could use a good cleaning.

[jbfr_54]

Re: Panasonic Plasma horizontal lines after repair attempts

I recently had the same issue after resetting the Y buffer boards, it took me several tries for each connector to find the right insertion position after cleaning thouroughly both cable ends (gold plated parts) and connector pins.
The cables must go far inside the connector but are reluctant to do so.
Identify each connector involved by the position of black lines on the screen and work ONE connector at a time to progress step by step, make sure the cables are inserted perpendicularily with the connector, tolerate no shift on position.
Once they are correctly set, the problem never appears agin as long as you do not remove those cables. Good luck.
Jean

[dolt]

Re: Panasonic Plasma horizontal lines after repair attempts

Update:

YEEESSSSSSSSSSSSS!!!!!

I purchased some electronic contact cleaner and cleaned the ribbon ends. I inserted one ribbon per time per jbfr's suggestion and turned the TV on to try each one.

Some of the ribbons took a few tries, but eventually all the horizontal lines went away. It is incredibly difficult to get those damn things seated correctly.

Many, many thanks to the people that replied.

[jbfr_54]

Re: Panasonic Plasma horizontal lines after repair attempts

Glad you succeed ! Cheers. Jean