The video on my 58" Samsung plasma stopped working a couple weeks ago. When powering on, it would click a few times like normal, but the screen would never power on. The screen does not glow, but there is audio.
I opened it up and noticed that an arc would occur a few seconds after powering up - on what I think is a surface mount capacitor (attached image) on the lower Y buffer. I disconnected the lower buffer and powered on the TV and the upper half of the screen came on. I tried the same test with the lower buffer and the bottom half of the screen came on, but it wasn't clean. After a couple power on/off cycles, the capacitor started smoking and the lower half won't come on anymore.
After reading that buffer/y main boards should be replaced together, I ordered both buffers and the y main board and installed all three. Upon powering up with all boards connected, I still have audio but no video. I can get the upper half of the screen to come on though. Here is my current situation:
There is no visual damage on this new lower buffer, but I performed the buffer short test with a DMM and found several traces on the buffer board that reported shorts.
Is it possible that the screen damaged the new buffer? I did not check the buffer for shorts prior to installation, so I don't know if it came defective. I can not see any cracks on the screen or edge of the screen, and the TV was not bumped/impacted prior to the video failing.
Are there any other tests that could tell me if putting another lower buffer on will damage that one?
I've attached pics of the original lower buffer before/after burning up. You can see a small crack in the capacitor C5503 that was arcing on power up. The picture of the lower screen was taken prior to the capacitor burning up. I can only get the upper half to come on now.
I opened it up and noticed that an arc would occur a few seconds after powering up - on what I think is a surface mount capacitor (attached image) on the lower Y buffer. I disconnected the lower buffer and powered on the TV and the upper half of the screen came on. I tried the same test with the lower buffer and the bottom half of the screen came on, but it wasn't clean. After a couple power on/off cycles, the capacitor started smoking and the lower half won't come on anymore.
After reading that buffer/y main boards should be replaced together, I ordered both buffers and the y main board and installed all three. Upon powering up with all boards connected, I still have audio but no video. I can get the upper half of the screen to come on though. Here is my current situation:
- Both buffers connected - no video
- Upper buffer only connected - video on upper half
- Lower buffer only connected - no video
There is no visual damage on this new lower buffer, but I performed the buffer short test with a DMM and found several traces on the buffer board that reported shorts.
Is it possible that the screen damaged the new buffer? I did not check the buffer for shorts prior to installation, so I don't know if it came defective. I can not see any cracks on the screen or edge of the screen, and the TV was not bumped/impacted prior to the video failing.
Are there any other tests that could tell me if putting another lower buffer on will damage that one?
I've attached pics of the original lower buffer before/after burning up. You can see a small crack in the capacitor C5503 that was arcing on power up. The picture of the lower screen was taken prior to the capacitor burning up. I can only get the upper half to come on now.
Attached Files
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