or Connect
AVS › AVS Forum › Display Devices › Plasma Flat Panel Displays › Intermittent vertical black bar on Panasonic 65" Plasma
New Posts  All Forums:Forum Nav:

Intermittent vertical black bar on Panasonic 65" Plasma

post #1 of 24
Thread Starter 
I have a Panasonic Plasma TV Model TC-P65S2 (no longer under warranty). It has developed a 3" or 4" vertical solid-black bar that runs from top to bottom and slightly right of the center of the screen. The vertical black bar is intermittent (it comes and goes).

It seems to happen more often and for longer (maybe 30 seconds or so) shortly after the TV is first turned on. It tends to go away after the TV warms up. Though, it doesn't go away completely. It may come back occasionally and more briefly (a few seconds) after the TV warms up.

Below is a simulated picture showing the location of the vertical bar. It's a real picture except for the two yellow panel overlays. A local repair shop says it's a common problem that they try to repair without ordering parts. Any advice on how to self repair this?


Edited by pvc - 10/26/13 at 7:34pm
post #2 of 24
http://www.avsforum.com/t/1339978/yellowish-vertical-band-on-panasonic-plasma-tv/0_100#post_23878513
post #3 of 24
Thread Starter 

Thanks for the reply. I think I will take it apart and look at the ribbon connectors to see if I can see any signs of damage.
post #4 of 24
Thread Starter 
Okay I removed the back metal cover. Here’s how…

Removed my mounting brackets. They screw directly into the TV chassis. Removed screws around the edge of the back. Note that there are two types of screws. Some are sheet-metal screws and some are machine-screws with a washer. There are some smaller machine screws with washers around the in/out connections panel. There are two even smaller machine screws with washers on the power connector. After all these screws are removed the back metal cover easily comes off.

Looking from the back there are 10 ribbon-connections on the left that connect to the screen. There are 15 ribbon-connections on the bottom that connect to the screen. There are 4 (that-I-can-see) ribbon-connections on the right that connect to the screen. May be one or two more on the right behind the in/out connections panel.

After a quick inspection everything looks good to me. I will look closer with a bright light and magnifying glass. I am guessing that I should look for a problem on one of the bottom ribbon-connectors because the solid black bar is vertical.

post #5 of 24
Thread Starter 
Looking at the back bottom (from left to right) I have three boards (TNPA5178, TNPA5179, TNPA5180). Each of the three boards have 5 ribbon-connections on the bottom that connect to the screen. But they all look good. No burned/shorted spots anywhere.

So I think I have reached the end of my inspection/repair process. I think I will put it back together and use it with the intermittent vertical bar. While I have it apart I'll clean out the dust with some compressed air.








Edited by pvc - 10/28/13 at 3:51pm
post #6 of 24
Just unplug and reconnect the intermittent driver connector, bottom of TV. It is a common issue on Panasonic PDP caused by slightly loose connector.
Use a bit of string to figure out which connector corresponds to what part of screen.
Do not change connector while set is plugged in.
post #7 of 24
Thread Starter 
Quote:
Originally Posted by tom669 View Post

Just unplug and reconnect the intermittent driver connector, bottom of TV. It is a common issue on Panasonic PDP caused by slightly loose connector.
Use a bit of string to figure out which connector corresponds to what part of screen.
Do not change connector while set is plugged in.

Thanks for the helpful post. I think it would be this connector (see picture below) located at the bottom of the screen and slightly right of center (left when looking at the back). Though, I don't know how to unplug and reconnect it??? Any tips on how to unplug/reconnect? Do I need to unscrew anything?

Oh, I found that i can put a fingernail on the black plastic bar (see the arrow in the picture) and flip it down and then snap it back up. Is that all I need to do to unplug and reconnect, or should I do more?


Edited by pvc - 10/28/13 at 4:25pm
post #8 of 24
Thread Starter 
I need some help to learn how to re-seat one of the 15 ribbon-connectors at the bottom of the screen. Here’s a closeup/macro picture of the connector. I pulled the black plastic door down to expose the pins. This black plastic door looks like it’s just a cover, not a connector. So I don’t know how to re-seat the ribbon-connector?

All I can do thus far is to open and close the black plastic door/cover. I think maybe I could unscrew the two screws to free the ribbon-cable and then pull the ribbon cable down. But I am very hesitant to do that.


Edited by pvc - 10/28/13 at 9:18pm
post #9 of 24
What you need to do is very carefully flip the latch, undo the two screws, pull the connector out firmly. Avoid touching the metal pins on it. Then re-insert it into the connector, screw down the metal plate (a heatsink) and clip the connector back in. Repeat for all nearby connectors in that area that you suspect may also correspond to that bar.
post #10 of 24
Thread Starter 
I was able to:
1)Flip the latch down/open
2)Remove the two screws
3)Pull the ribbon (which is attached to the metal heat-sink) down/out
4)Reinsert the ribbon cable into the connector
5)Screw down the metal heat-sink
6)Flip the latch up/closed

In the pictures below note that the mark on the last picture is a flash/glare artifact from the camera. It is just a slight ribbon kink that was always there and it looks worse in this flash photo than it does in natural light. Give me a few days to get this 165 pound monster back up on the wall and I will test to see if this fixed it. And Thanks!!!

Picture of ribbon cable removed. I had to prop it up with a screwdriver to take this picture because the metal heat-sink weighs it down...


Picture of ribbon cable reinserted...


Picture of screws back in and the latch up/closed...
post #11 of 24
Thread Starter 
Before I buttoned it back up I tested with power on (being very careful not to touch anything with power on). I wanted to test that I didn't cause a permanent vertical bar. I didn't.

Buttoning it back up: If you look at the back cover with a bright light it has stamps (ST4 for the sheet metal screws and M4 for the machine screws with washers). The smallest machine screws with washers go around the in/out connections panel. The back cover fits/snaps inside the outer TV frame. You may need to wiggle it a little to get it to snap inside. Replace the plastic bracket around the power plug. The power plug is very fragile without that bracket.

I will post long term results in a few days. Thanks again!
post #12 of 24
Hope it works for you!
post #13 of 24
Quote:
Originally Posted by pvc View Post

Before I buttoned it back up I tested with power on (being very careful not to touch anything with power on). I wanted to test that I didn't cause a permanent vertical bar. I didn't.

That ribbon cable looks defective, with a bubble and a hole that doesn't show in the previous pictures. Did it get damaged?

post #14 of 24
Looks like a reflection to me. You can't see it in the other photos.
post #15 of 24
Thread Starter 
Quote:
Originally Posted by tom669 View Post

Looks like a reflection to me. You can't see it in the other photos.

In post #10 I had said "In the pictures below note that the mark on the last picture is a flash/glare artifact from the camera. It is just a slight ribbon kink that was always there and it looks worse in this flash photo than it does in natural light".

Also I measured the position of the vertical bar and marked it with a piece of tape. The vertical bar is two ribbons right of center (not one ribbon right of center as I thought). So the pictured ribbon cable (with camera flash glare) is working fine. It's the next one over that has the problem.

UPDATE:
I took it apart again and reseated the ribbon located at two right of center. Now the problem has morphed into something different. When I start the TV a permanent vertical bar is present. But after the TV warms up the vertical bar goes away. It seems to stay away except for an occasional slight flicker.
Edited by pvc - 10/30/13 at 8:54am
post #16 of 24
If reseating it does not fix it, then it could be a bad C board or a bad panel.
post #17 of 24
Thread Starter 
Quote:
Originally Posted by tom669 View Post

If reseating it does not fix it, then it could be a bad C board or a bad panel.

It has been working well for several hours. I even tried turning it off and on and I could not get the vertical bar back. That's good! Maybe if I leave it off for several hours the initial vertical bar may come back. Thus far we are happy with these results.

Question: When you say "C board" do you mean the TNPA5179 board where this ribbon cable connects at the bottom? This one?...



I can get a TNPA5179 board for $15 to $20 on EBay.
post #18 of 24
Yeah TNPA5179 is a C board part #, there are several C boards but they are not interchangeable.
post #19 of 24
Thread Starter 
The TV is working very well now after warm up. I ordered a Panasonic TC-P65S2 C2 BOARD TNPA5179 (the center board) for $15 on EBay. Maybe changing the C-board will make it perfect? Maybe not. I will post results in a week or two.
post #20 of 24
Thank you for the great info on this problem. I have a tc-p65 viera that has the three right most vertical bars displaying stripes or are blank. I am trying to determine if this model has IC's embedded into the ribbon cables like some other models. I do not see any on the portion of the cable the extends out of the glass. Could there be any further down the signal path?
Thanks again,
Ted
post #21 of 24
Thread Starter 
Quote:
Originally Posted by tedharbour View Post

Thank you for the great info on this problem. I have a tc-p65 viera that has the three right most vertical bars displaying stripes or are blank. I am trying to determine if this model has IC's embedded into the ribbon cables like some other models. I do not see any on the portion of the cable the extends out of the glass. Could there be any further down the signal path?
Thanks again,
Ted

If you look at the big ribbon connections on the sides, you can see that they are fused into the screen. I think it's the same with the bottom ribbon connections (15 on my model). Each bottom ribbon cable splits into 3 cables after the metal heat-sink and that disappears out of sight and I assume fuses into the screen just like the side ribbon connectors.

Also tom669 said (and I believe him) that "If reseating it does not fix it, then it could be a bad C board or a bad panel". That indicates to me that there is nothing further down the signal path.
post #22 of 24
If you have any lines or garbage in the bar, the plasma panel is bad and this cannot be fixed.
post #23 of 24
Thread Starter 
Update: Yippee!! It works! I think replacing the C-board (TNPA5179 $15 on EBay) has fixed the problem. I have been watching for a few hours with no sign of the dreaded vertical black bar. Note that this model TV has three C-boards. In this case it was the center C-board (TNPA5179) which corresponded to the screen position of the vertical black bar.

Re-seating the eight ribbon connections on the center C-board is a delicate task. I left the new C-board loose while making the right/left ribbon connections. I still cannot be sure if it was the board or the ribbon connection. After replacing the C-board, a short power test (being careful not to touch anything with the TV open) showed a permanent vertical bar in the same location. I reseated it once more and now it works flawlessly.

All's well that ends well. Thank you, Thank you, Thank you tom669.
post #24 of 24
Glad to hear! Enjoy your TV! smile.gif
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Plasma Flat Panel Displays
AVS › AVS Forum › Display Devices › Plasma Flat Panel Displays › Intermittent vertical black bar on Panasonic 65" Plasma