LG 50PA5500 Plasma - No picture then no sound

[tom66]

Re: LG 50PA5500 Plasma - No picture then no sound

Check your Y-buffer board for shorts:
https://www.youtube.com/watch?v=51SZsfH60EY

[Solomonj151]

Re: LG 50PA5500 Plasma - No picture then no sound

Having dealt with one of these myself...

Disconnect the top Y-buffer board. It's the board in the top left of the panel with the orange ribbons coming out of it. You will need to undo the ribbons and unscrew the board, then slide the board out from the connectors.

Turn the TV on, if you get half a picture, the plasma panel is bad and this is an unrepairable fault. There is a serious design flaw with these panels where the casing eats into the ribbons going to the panel causing short circuits. Unfortunately the ribbons aren't replaceable, they are glued to the panel.

Hello, I have a similar issue, LG 50PA4500. This is my first "in-home" TV repair, I have some experience with a previous employer swapping boards for computers / TVs but do not understand the technical jargon of how electrical current works. I have basic multi-meter skills but if you can help me in any way I would appreciate some coaching here.

My TV was working fine this morning then all the sudden it turned off. I thought this was because of my computer screen saver but when I tried to use the remote to power on there was no video. After a few times of trying to power it on I realized a few things.

Probing:
- With the TV unplugged, I plugged it in and heard the click like normal.
- Then pressed the power button on the control panel, it clicked again like normal.
- The power light (red) flashed twice (unusual)
- No video appears from my live HDMI source, I confirmed that there is sound coming from the source through the TV.

Troubleshooting:
- Took off the back casing, there are no bad caps.
- No evidence of burning or overheated components
- No smell
- No unusual noises
- The red light on the main board is solid
- The green light on the control board is flashing
- I tested the VS and VA on all 3 power boards and the voltage was normal.
- After looking through several forums I followed the steps of removing the top left Y board like the screen shots that Mac108 posted.
- I powered on the TV and the bottom half flashed grey briefly and then disappeared.
- Does this really mean that my display is shot because of the ribbon cables? Is there any other troubleshooting that I have overlooked? I found most of the boards on shopjimmy...

[Solomonj151]

Re: LG 50PA5500 Plasma - No picture then no sound

Also I might add after the bottom half flashed grey, I noticed that the backlight is consistent across the screen but there is still no video from the input source.
- When I put that Y board back in, I have no backlight and no bottom half flash upon power on.

[Solomonj151]

Re: LG 50PA5500 Plasma - No picture then no sound

After pulling the top left Y Board in the 50PA4500 I did a continuity for shorts like Tom66 linked, I found that on the bottom ribbon connector there was one area at the end which made beeps for what I am assuming is a short? Any help would be much appreciated.

[Solomonj151]

Re: LG 50PA5500 Plasma - No picture then no sound

I know no one responded to my messages but I FIXED IT!!! If anyone stumbles across the post in need:
- After ordering the suspected top left Y board EBR73748601 Buffer Board EAX64299201
- I installed it and the TV worked perfectly.
- I did find upon initial inspection that the "ribbon pinch" issue did occur on my TV, the ribbon cable connected to the board did have a cosmetic issue that may have been the original cause. I am unsure. I moved the TV 1 day before the issue began, set it up and it worked fine until the next morning, then the issue occured.
- By replacing the EBR73748601 in my LG Plasma 50PA4500 the issue resolved.
- see the pictures below of the actual board and ribbon cable referenced in my solution message above.

[freakaftr8]

Re: LG 50PA5500 Plasma - No picture then no sound

Freaker8--

Does that bad tab/plastic case issue happen on the smaller, say--42" versions of this series....?

sorry I missed your post to answer your question I'm honestly not too sure I only encountered the 50 inch version of this tv

[freakaftr8]

Re: LG 50PA5500 Plasma - No picture then no sound

I know no one responded to my messages but I FIXED IT!!! If anyone stumbles across the post in need:
- After ordering the suspected top left Y board EBR73748601 Buffer Board EAX64299201
- I installed it and the TV worked perfectly.
- I did find upon initial inspection that the "ribbon pinch" issue did occur on my TV, the ribbon cable connected to the board did have a cosmetic issue that may have been the original cause. I am unsure. I moved the TV 1 day before the issue began, set it up and it worked fine until the next morning, then the issue occured.
- By replacing the EBR73748601 in my LG Plasma 50PA4500 the issue resolved.
- see the pictures below of the actual board and ribbon cable referenced in my solution message above.

Good glad to hear it's fixed now for some preventative maintenance I would remove those little plastic tabs that rub the ribbon cables because it is going to cause a problem it's not if its when.

[Alexdjx]

Re: LG 50PA5500 Plasma - No picture then no sound

Somebody helps me with a leg pa5500 no video and sound??