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Re: NEC PX-42VP4G Power supply
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.
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Locking OSD settings
When the OSD is locked, settings cannot be changed in the OSD menu.
The OSD functionality is enabled or disabled by pressing the Menu button and holding it for 10 seconds. Upon disabling the OSD, an OSD Lock-out message is displayed for 10 seconds. When the OSD is locked and an OSD menu button is pressed, the OSD Lock-out message is displayed for an additional 10 seconds. When the OSD is locked, pressing the OSD menu button for 10 seconds unlocks the OSD and displays the main menu.
Identifying monitor conditions
Special messages display on the monitor screen for the following monitor conditions:
Input Signal Out of Range : Indicates the monitor does not support the input signal because the resolution and/or refresh rate are set higher than the monitor supports. Recommended refresh rates are as follows:
For the w1858 monitor: 1366 x 768 @ 60 Hz.
For the w2338h monitor: 1920 x 1080 @ 60 Hz.
Monitor Going to Sleep : Indicates the screen display is entering a sleep mode.
Check Video Cable : Indicates a video input cable is not properly connected to the computer or monitor.
OSD Lock-out : When the OSD is locked, the warning message OSD Lock displays for 10 seconds.
No Input Signal : Indicates the monitor is not receiving a video signal from the computer on the monitor video input connector. Check whether the computer or input signal source is off or in the power-save mode.
Auto Adjustment in Progress : Indicates the auto-adjustment function is active and in process.
The monitor is possibly not receiving power. Perform the following steps to fix the problem:
Ensure that the electrical outlet and the monitor are both switched on.
Check that the power cord is firmly plugged into the electrical outlet and the power supply unit.
If the power cord has a removable fuse, replace it.
Try another power cord.
Try another electrical outlet.
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:
Press any key on the keyboard or move the mouse to restore operation.
Check the Power Management software on your computer.
Press 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:
Check that the signal cable is firmly connected to your computer
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:
Select (Image Setup) menu in the OSD.
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:
Select (Image Properties) from the OSD menu.
Select (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
The 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
Symptom : No Image on the screen. I cannot turn on the monitor.
Checklist 1 : Is the power connected properly ?
Action : Check the power cord connection and supply.
Checklist 2 : Can you see "No Connection. Check Signal Cable" on the screen ?
Action : Check the signal cable connection.
Checklist 3 : If the power is on, reboot the computer to see the initial screen ( the login screen), which can be seen.
Action : * If the initial screen (the login screen appears, boot the computer in the applicable mode (the safe mode for Windows 98/95) and then change the frequency of the video card.
* Note : If the initial screen ( the login screen) does not appear, contact a service center or your dealer.
Sympton : I cannot see the ON Screen Display.
Checklist : Have you locked the On Screen Display (OSD) Menu to prevent changes ?
Action : Unlock the OSD by pressing the MENU button for atleast 10 seconds.
I have the same problem with vertical coloured lines on my NEC PX-42VP4G/S. The photo only shows a black background just so it's easier to see the lines in the photo but normally the picture is OK except for the vertical lines which aren't always in the same place.
If anyone can advise on exactly what I need to replace then I would be very grateful.
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.