Question about NEC PlasmaSync PX-42VP2A 42 in. Television

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NEC PX-42VR5G 42

Hi,

Thanks for your suggestion. From what I can see, there is only one small glass fuse on the PSU board, which is ok. The set attempts to power up, then appears to shut down again, approx 30secs later, returning to standby.

If you disconnect the PSU from the line board, then the PSU appears to stay on, suggesting a problem on the line board somewhere, or maybe the PSU has a fault, not ouputting the correct voltages. This would depend upon whether or not the PSU is open collector type or not, which is information I do not have.

The set was manufactured around 2005 I believe. I have been in touch direct with NEC, who inform me that no schematic drawings or service manual data is released for this model. Without this information to hand, I feel I am clutching at straws, as you have no knowing of what voltages or waveforms should be present at the various TP's on the boards. Any further suggestions you have would be most welcome. Many thanks, Dave.

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5 Suggested Answers

  • 3 Answers

SOURCE: NEC PX-42VP4DA Won't stay on.

It may not be the power supply. It can also be another board/module that causes the PS to cut-off.

Posted on Jan 08, 2009

  • 3 Answers

SOURCE: Does anyone have the voltage specs on a PNT-426

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

Posted on Jul 07, 2009

eagle338
  • 4889 Answers

SOURCE: NEC PX-42VM3A 42" Power problem

Yes the clicking noise does confirm a power supply related issue. The clicking noise is caused by the relay switches turning themselves of due to over load of certain circuits or it was not reset after a previous power surge. Rest the tv by unplugging the set from power supply, hold for 2 minutes and plug it back in. See if the problem persists and let me know.

Sai.

Posted on Apr 19, 2010

  • 1 Answer

SOURCE: Problem with my NEC PX-42VP4PA

it goes on for a while and then shuts off after then the colour show not good i need help for this problem

Posted on Apr 25, 2010

  • 1 Answer

SOURCE: nec plasma px-42vm2a power board please help

i have NEC 42 inch and the screen has colors ines and cant see the screen. It also has the ESPN logo on the bottom right hand corner. i canchange it but i cant see the screen

Posted on Jun 26, 2010

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Hi. When I switch on my NEC 42" Plasma (PX-42VM3A), the on light changes from red to green but then nothing happens. I have box-loads of spare parts but would appreciate any assistance in pointing me in...


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Hi - first check that all the fans are rotating - the set will shut down if they are not.
***** WARNING potentially FATAL voltages (up to 400V DC) exist on the PSU boards - if you don't know exactly what you are doing don't ! *******
Unfortunatly the fault could be on a) PSU b) CPU board, as this monitors the PSU voltages and will shut down the set if the measured voltages are wrong c) plasma drive circuits - if these are drawing excessive current, or someother fault exists the fault feedback signal to the CPU board will activate and the set will again shut off.
Check the PSU voltages, the standby power must be OK otherwise the set wouldn't work at all !. The +5V switches on first followed by the +70V and +170V (about 1-2 secs delay.)

If the 70 and 170 dont come up try removing (with the power DISCONNECTED) the two large double row connectors on the PSU board near the 70/170 V test points - these supply the plasma drive circuits - the set will still switch off as there is a fault feedback line from the drivers, but it should stay on long enough to check the voltages.

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