Re: Samsung plasma PN59D7000FFXZA occasional PS resets

Well, finally solved this, at least I think so. Turns out that the cable between the power supply and main board had a loose contact on the main board end. It happened to be the wire that carries the power supply control signal from the main board (SW_P on the main board, PS_ON on the power supply). I found it while looking for a temperature sensitive component by heating with 100C air from my rework station. I was expecting to find a sensitive electronic component, but heating the connector repeatably triggered the power dropouts...

Re: Samsung plasma PN59D7000FFXZA occasional PS resets

Well, I swapped out the 3 caps on the Y-Main, but doing so did not fix the problem. I still have occasional resets.

PS_ON is definitely going high (to the "off" state) momentarily when the dropouts occur, so I'm resting blame on the main board. I'm fairly certain it is in control of that signal. I have been able to elicit the failure more frequently by gently heating the main board with a heat gun, but haven't been able to isolate it to a component or even a small region of the board. It still doesn't...

Re: Samsung plasma PN59D7000FFXZA occasional PS resets

Fair enough. It's an inexpensive and simple enough thing to try. I'll give it a shot and post results later. Thanks again.

Re: Samsung plasma PN59D7000FFXZA occasional PS resets

Thanks for your response, tvtimmy. What's the theory behind your suggestion? Does the the Y main affect the assertion of PS_ON?

My set has been acting up for many months now. The symptom is that the screen randomly goes black and then returns to normal several seconds later. Sometimes it goes black for a few seconds longer and then shows the Samsung startup splash screen before the program returns to the display. The issue is quite variable: sometimes it can go many tens of hours without going black; other times, it will do it 5 times in 15 minutes. The problem occurs with HDMI inputs (any port) and component video. I haven't tested composite or antenna. When using HDMI, the TV is downstream from my audio receiver/HDMI...

Re: New Members - please post your introductions here

Hello! My name is Galen and I'm in the Dallas/Fort Worth area of Texas, USA.

I'm a retired electrical engineer, though most of my career was algorithms and analysis rather than circuit design. But I've been soldering since I was 12 and still like to hack around with hardware.

Glad to be here!