We are trying to repair a NEC px-42vm5a LCD tv for a not for profit. it has power but we cannot get the control panel to respond to different inputs, and we do not have the remote, we cannot get the control panel to even pull up a menu can you help?

Paul, Check the attached links, not much on this power supply.
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NEC TV Power Supply Board

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Mine too.....any solutions yet??

Hello
From your description, I can't understand the problem of your TV well. "Half white half black screen with video signals"; you describes what? Please give me more details about the fault, as clear as you can, so that I can help you. Send these details to me by Fixya. OK.

Same problem...any solution?

tienes un problema en el plasma de imgenes fentasmas lo que te sugiero que le hagas un buen mantenimiento

Most likely a transistor - NEC used FSM series for a while which are now discontinued. Let me know if you need info on how to find/tell which parts are bad.

I have a PX-42VM5A and my Power supply is a PNT-426 (by Sanken Electric Co. LDT). Here are my specs: INPUT: AC 100-240V; OUTPUT: (there are nine outputs) +170v 1.6A; +60v 1.6A; +5v 4.0A; +2.5v 1.9A; +3.5v 1.9A; +7v 1.0A; +12v 0.5A; +12 v 1.9A and +6v 1.2A

Yes, if your laptop has a VGA out port (that is the external display port - usually blue with 15 pins).
The NEC display has a VGA input on the right-hand side.
You just need a VGA cable that you plug in both connectors.
Then, read your laptop manual to determine how to activate the external display (usually the FN key with an other key that has a display icon on it).
On the NEC display, make sure it is using the RGB1 input (use the remote to activate this input).
That should do it.

NOTE: Make sure your laptop is using a reasonable screen resolution (that is 640x480 or 800x600).

Try holding down the 'INPUT SELECT' button, then press the power button on, on the tv at the same time.

My NEC PlasmaSync did the same thing.  It's caused by not using a power filter on your AC input.  To reset your TV, turn off the power button on the bottom until no lights are flashing.  Then hold down the "Input Select" button while holding down the "power" button.  The tv should then reset.