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Samsung PN60F8500AFXZA, can't determine X or Y failure

Troubleshooting TVs and Video Sources - Badcaps Forums - www.badcaps.net
Hi guys!

This plasma comes on and has no picture (can't see panel prime, but it may?)

VS and VA shutdown immediately, but VSC stays up, even though it is -204v instead of -198v.

When I disconnect the Y and X separately or together, the VA and VS still shut down at turn on. I think it's due to the type of ground detect circuit the power supply has, right? So it's not easy to just unplug a board to see what is causing the shut down.

The main board has the logic built in and there is an led flashing once every (I think it was 2.5 seconds?) which the service manual says is a "X/Y drive failure".

The question is: which one is it?

I've tried unplugging the Y buffers from the panel and the VS and VA DO NOT shut down, but I don't see any panel breaks and I doubt the panel is bad. If I plug those back in and unplug the X side from the panel, I also stop the VS and VA from shutting down, but I think in both cases, it's just because the panel isn't being used that the voltages stop shutting down.

I haven't tried testing the buffers for shorts, do you think I should? It just doesn't seem like they would be causing the issue if unplugging the Y board doesn't stop shut down.

The power supply doesn't seem to have any of the usual bad connections.
Date: Jan 12, 2018   


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