NEC PX-50XR5W (Plasma) Shuts down

[Markus1]

Hi there,
Seeking your guidance again.
At Power On relay clicks, fans start to spin, then after a second or two the relay clicks again and all shuts down. A small red LED on the sub-board of the PSU starts blinking red.
The front LED indicator at the beginning shows green, after shut down turns off and in about 20 sec turns on red.
I did try to disconnect power to the Y-drive to observe a brief presence of Va (it is Vd on NEC) and Vs voltages before shut down. Nothing observed and no difference in sequence behavior.
I could not find anything related to this model on the Badcaps, and had no luck with the PSU schematic search. Hence hoping for a good advice from you guys.
Attached:
- full view from the back
- view of the PSU (with additional heat sinking plates removed)
Any help will be appreciated.

[Markus1]

Re: NEC PX-50XR5W (Plasma) Shuts down

I would really need some direction on where to start with this shut down problem. Any suggestion? Any chance of a schematics for the Power Supply Unit? Will be greatly appreciated.

[Markus1]

Re: NEC PX-50XR5W (Plasma) Shuts down

Still having problem with this TV, still calling for help. Possibly the issue is with Power Supply Unit but it is hard for me to move without the circuit diagram.
Some internet searches indicate that possibly Panasonic used the same power board.
In my case (NEC) the PSU is marked as KPC 2294V-0.
Can any one confirm that it was actually used by Panasonic and in what TV model number?

[ReeceyBurger123]

Re: NEC PX-50XR5W (Plasma) Shuts down

So does Vs shut down even with Ydrive not present ?

[Markus1]

Re: NEC PX-50XR5W (Plasma) Shuts down

Thanks ReeceyBurger123 for you reply.
Yes, PSU shuts down even when Ydrive is disconnected.

[monrel]

Re: NEC PX-50XR5W (Plasma) Shuts down

Hi!

I have the 61 inch version of this screen and bought the service manual for it, online. It makes mention of your model number in it, a few times. Are you still looking for help with it? If so, I'll send you the PDF.

P.S My screen is displaying EXACTLY the same problems as yours. Please let me know if you have any advice.