Question about NEC PlasmaSync 42MP1 42 in. Television

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NEC PX-42VP4DA- Won't stay on

I saw your post replying to somebody who had a problem with their 42MP1 NEC not staying on. I have the same issue with my 42VP4DA- I turn it on ad I hear a click, the light goes red--> green then it clicks off again after a few seconds. I have been able to see the menu prompts for a few seconds while this is happening.

So far I have only tried unplugging the unit. There are no authorized NEC centers here in NH and it sounds pricey to get it repaired by them anyway.

What would you recommend starting with on my model? Do you think this sounds like a power supply issue or a scan board? If you think it's the power supply, would you know how I can check this with a multimeter?

Thanks for any advice you have as I am not ready to junk this tv if I don't have to.

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  • Zaid Haddadin Aug 06, 2008

    Nobody seems to carry a ps when I search with the model of the TV "
    NEC PX-42VP4DA." I am looking for a source for a new one if anyone knows one.

  • Anonymous Dec 21, 2008


  • ulrike208 Jan 31, 2009

    who is the manufaktor of this ******* transformers ???
    Can anybody help to find it ?


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Yeah, it's the power supply.  I've ordered (2) of these power supplies used, and the same problem seems to be happening with both.  The transformers on the power supply board (namely, the 170+ volt one) are the problem. You have several test points on the power supply board which you can touch with a voltmeter to see if your television is getting the correct voltage .  Mine made a a high pitch squeal which indicated which transformer was bad. If you find a place to get the transformers new - id like to know, because mine is still non functional because of this and the fact that a new PS board is over $600.  

Posted on Jul 14, 2008

  • Kyle Steven OHare
    Kyle Steven OHare Aug 06, 2008

    It's the PSU, likely the 170+ transformer. If you open the back of the Tv, on the power supply board you'll see test points (or TP) with different voltages the TV needs to function. Use your voltmeter on these test points to see what voltage they are when you turn on the television. Don't shock yourself. 



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The transformer that is making a loud noise and that is not working properly with my monitor is the 70+ (EC-1180 or PC40 9Z19 Z). I can't find the transformer or the PKG 1720 PSU. Help!

Posted on Aug 20, 2008

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You should take the monitor to the NEC service rep for your area.

This monitor is service with board exchange. They will try the modules to determine the fault, and then do the factory adjustments to match the module.

By your description, it is most likely that the fault is on the power supply and or the panel drive module.

This TV set will be on the expensive side to service. If the display was having good emission, it may be worth to invest the money in to it.

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Service manual

You can search this database for the service info you seek about your tv here:

Most service manuals with schematics cost about $27.95 for the PDF version of it, otherwise the paper version is about $15.00 more for handling and shipping.

You will need the chassis number of the unit in question in order to search for it. I hope this helps!

Good Luck!
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Check the +170 volt  test point on the power board (not the power filter board, the one that the plug comes into) but the one to the right of that board. It has a 5v test point (TP +5v) , a +170 and a +70. I've found that the +170 transformer goes bad, and won't allow you to adjust the voltage using the pot screw. 

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