Another Samsung plasma issue

[JohnCT]

Originally Posted by YamahaFreak

Hi again John,

I found the measurement process straightforward. Here is what I found.

VS voltage marked on the panel is 208 volts. I measured a high of 463 volts at startup, then it steadily dropped until stabilizing at 23 volts.

VA voltage marked on the panel is 57 volts. I measured a high of 126 volts at startup, dropping to zero after several seconds.

I repeated the measurements a few times...always the same. This, to me, suggests there is a power supply issue.

Holy crap, I've never seen one do that. Are you sure about your meter and using the power supply ground screws for ground? These have a hot and cold side so if you're using the heatsinks as ground, be aware that there are one or more on the hot side.

Even when I've seen them overshoot, it's never been more than a few volts as the power supply is very good about watching for overvoltage and snuffing them out quickly.

Also, most VA and VS supplies are separate from each other, so it seems extraordinarily odd that both would not only overshoot, but by so much.

Please don't take this the wrong way, but see if you can verify your meter.

I'll see if I have a power supply for that in the shop. Is there a BN44 number on it?

John