Question about NEC PlasmaSync 42VP4D 42 in. HD-Ready Television

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NEC PX-42VP4G Power supply

Screen works perfectly - OSD menu etc. - until I connect video signal. I hear a loud click (power supply relay?) and the power supply shuts down

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  • Cosmologist May 13, 2008

    Hi Abrsvcs, Thanks for your rapid reply. I have been using video 1 (BNC) and video 2 (yellow RCA - both BNC composite inputs). I checked my source and the video shows a DC level of about 1.3 V. Is that causing the problem? I also tried shorting both inputs but that did not cause a problem.

  • Cosmologist May 13, 2008

    Thanks Dan, I tried feeding the video via series capacitor (0.01, 0.1 & 100 uF) to eliminate the DC. I git distorted video to varying degrees, but the set stayed on significantly longer (up to 3-4 minutes) before shutting down. I need to be more systematic, but it seemed to me that video 2 is more tolerant than video 1. I have to quit tonight (it's 11:30 PM here in Sydney), but I will look for futher comments ideas tomorrow morning. Thanks again for taking the time to help. Lew.

  • Cosmologist May 13, 2008

    I have done some more checks. The set definitely stays on longer with input to video 2 than with input to video 1. Looking at power supply voltages, I find that the 5 V and 60 V rails are solid, but the 170 V rail starts at 175 V with no video, but struggles to maintain 140-150 V with video input. It recovers to 175 V when video input is removed. On one occasion, on removing video input I saw the rail voltage overshoot to 180 V, and then the set shut down. The picture is not distorted this morning (with 100 uF in series with input to video 2). By the way, I had already lowered brightness to near minimum, to reduce load on the power supply, and have not changed that. I seem to be seeing strong imprints of some OSD menus, which is surprising in view of the fact that the OSD times out after a few minutes.

  • Cosmologist May 14, 2008

    Thanks Dan, The e-mail address is

    At this point I'm wondering about the 1500 uF 200V electro on the power supply board. It is probably across the 170 V rail and shows a (very) slight bulge at the top.


  • Jacob_enwall Aug 17, 2008

    My DVI and Component port works fine! But when i try to connect a digitalbox or a video game in rgb (video input or composite) it shuts down directly.
    Very strange problem.

  • Keith Jan 30, 2013

    I have one of these sets with the same problem. Menu/OSD works when powering up with no inputs. As soon as any video input is supplied the set quickly shows a picture and then turns off. The only way to get it back on is to turn power off at switch and remove inputs then turn on again. Menu is then available but as soon as input supplied it shuts down again.

  • Keith Jan 30, 2013

    I would be interested to know what solution you came up with Cosmologist


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Check to be sure that there is no voltage on the input line. You don't indicate what input you are using. Since the set appears to work without an input connected, try looking at the input cable. Also, if the problem is internal to the set, shorting the input jack would cause the same behavior. Please update this with what you find.

Posted on May 13, 2008

  • 1 more comment 
  • ABRsvcs May 13, 2008

    At this point I'd suspect the video source. There should not be any DC voltage at all. The set is shutting down to prevent damage. There is a problem with the sources. Check those further.


  • ABRsvcs May 14, 2008

    Send along an email address so I can send you more info. I can refer you to someone with more direct experience with these sets, but not in a public forum.


  • ABRsvcs May 14, 2008

    Try changing that cap. I'd guess that its current value is very small. That should resolve the problem.



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Troubleshooting Flat Panel Monitor issues. Screen is blank and power indicator...

Troubleshooting Flat Panel Monitor issues.

Screen is blank and power indicator is off

The monitor is possibly not receiving power. Perform the following steps to fix the problem:
  1. Ensure that the electrical outlet and the monitor are both switched on.
  2. Check that the power cord is firmly plugged into the electrical outlet and the power supply unit.
  3. If the power cord has a removable fuse, replace it.
  4. Try another power cord.
  5. Try another electrical outlet.
  6. Check the power connection at the back of the panel.
Screen is blank and power indicator is steady green

Brightness and Contrast may be too low. Adjust the brightness and contrast using the On-screen display controls (OSD) by selecting the button
Screen is blank and power indicator is steady amber

The monitor is in the Power Management Standby state. The power management feature is invoked when the computer recognizes that you have not used your mouse or keyboard for a user-definable period. Perform the following steps to bring monitor out of the power management state:
  1. Press any key on the keyboard or move the mouse to restore operation.
  2. Check the Power Management software on your computer.
  3. flatpnlmont12.jpgPress the (OK) key to switch between analog and digital mode. If the panel is the wrong mode for the signal being provided, the monitor appears to go into sleep mode.
Screen is blank and power indicator is flashing green
Display mode of the computer is outside the range of the monitor. The display mode the monitor uses is controlled by your computer. Therefore, you should refer to your computer's documentation for details on how to change display modes.

The image size, position and shape may change when the display mode changes. This is normal and the image can be readjusted using the IMAGE SETUP and the monitor controls.

Note: Unlike CRT monitors, which requires a high refresh rate to minimize flicker, TFT technology is inherently flicker-free. If possible, configure your computer for 1600 x 1200 addressability at 60Hz vertical refresh rate.

Use the following table as a guideline and reconfigure your computer to use a supported display mode. The highest resolution (for example, 1600 x 1200) produces the optimal output, but limitations of your monitor may prohibit this setting. Adjust the addressability mode until an image appears.

CHECK SIGNAL CABLE" message is shown and power indicator is steady amber.

The monitor is not receiving a video signal. Perform the following steps to fix the problem:
  1. Check that the signal cable is firmly connected to your computer
  2. Check that no pins are bent in the signal cable connector.
There are noises in the video signal. The IMAGE SETUP function is used to adjust the level of noise in the video signal which causes horizontal lines or areas where the image appears to be unstable and jitters or shimmers. This can be done automatically or manually.
Note: It is not applicable to digital input.
Use the image setup fix the problem:
  1. flatpnlmont6.jpgSelect (Image Setup) menu in the OSD.

  2. Select Manual to adjust CLOCK/PHASE settings.
Image appears to be discolored

The color setting may be incorrect. Perform the following steps to adjust the color settings:
  1. flatpnlmont8.jpgSelect (Image Properties) from the OSD menu.
  2. flatpnlmont9.jpgSelect (Color Properties) to adjust the color mode you find most comfortable or fine tune the colors using the Custom menu.
A few dots are missing, discolored, or inappropriately lighted

A small number missing, discolored, or lighted dots may be present on the screen, which is an intrinsic characteristic of the TFT LCD technology and is not an LCD defect.
Using On-Screen display (OSD) controls
flatpnlmont12.jpgThe settings adjustable with the user controls are viewed through the OSD. Press the (OK) button to display the main OSD menu.
OSD main menu:

Note: The LCD monitor needs time to become thermally stable the first time you turn it on each day. Thus, to achieve more accurate adjustments for parameters, allow the LCD monitor to warm up (be on) for 15 minutes before making any screen adjustments

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Power supply board it dead.Replaced the power supply board should solved this problems.Tries, to buy a refurbish power supply board. .

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hi there, i recommend replacing the entire board. once you have a short like this, the micro board itself will become useless. the thin micro circuitry has become separated within the layers, preventing a closed current transfer. its best to order a new canvas so to speak.

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

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NEC PX-42VP4DA- Won't stay on

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.  

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