Insignia NS-PDP50HD-08 / Samsung PN50A5nn

[kartwood]

This set comes on long enough to display blue screen and OSD then shuts off. The SMPS is one which flashes error codes. (4 flashes-Vg). I'm guessing this could mean over voltage or over current.

I tried to narrow it down by disconnecting stuff and discovered that if I pull any one Y drive connector going to the panel, the set would work fine save the missing part of the picture.

I had a good Y-Main on hand and that didn't make any difference. I have include a couple of pictures. Thanks!

[tom66]

Re: Insignia NS-PDP50HD-08 / Samsung PN50A5nn

Vg is the 15V or so supply from PSU to Y- and X-main. Could be failing buffer causing the issue as 15V is used for buffer boards. But that would usually be only one channel. Try to monitor Vg voltage before & while it is malfunctioning.

[kartwood]

Re: Insignia NS-PDP50HD-08 / Samsung PN50A5nn

Thanks for the help! The situation has gone from bad to worse. Even with all of Y cables disconnected, it will not come on. It just starts up then after a second, it flashes the Vg error. It comes up to 14.8 volts.

I have disconnected both the X-Main and Y-Main so there is no load on the Vg at all. It still shuts off with the same error. I suspecting the SMPS now but don't have spare.

[tom66]

Re: Insignia NS-PDP50HD-08 / Samsung PN50A5nn

Where is the LED that blinks on the PSU?
Part number of PSU e.g. LJ44-xxxxxx?

[kartwood]

Re: Insignia NS-PDP50HD-08 / Samsung PN50A5nn

The PSU is an LJ44-00145B. It is also marked 50WF3. The error LED is LED8001 and is locate just above the connector for the logic pwb. It is almost the same as a Samsung BN44-00222A.

I was mistaken about the error. 4 flashes is actually Vs. I need to get stronger reading glasses.

I believe this means that the logic board removed the Vs_on signal.