Screen is black except briefly blue upon power on or putting source on "VGA"

so working on super old 2007 PC monitors. and no PC connected."? it is NOT ANY LED BACK LAMP monitor here.
came new with XP PC's.
the monitos all good to sleep mode if no PC vidoeo connected.
in the usa, even by law, (energy star)
how ever lacking a PC, the screen will show "no signal entering sleep mode"
VGA monitor.
LED = blue on, amber sleep, LED out, oFF.
NO 1080P mode allowed, (so common now) <<<< big clue here.
set the PC to 1024 x 768 (to test ) 60Hz.
using a flash light (torch) tool,.
turn on Monitor, see blue LED
point flash light to screen, see data, now, on sceen in the beam
now you now CCFL backlamps are dead. as most are this old.


Display Modes (Resolution)

640 x 350
720 x 400
640 x 480
800 x 600
832 x 624
1024 x 768
1152 x 870
1152 x 900
1280 x 1024
1440 x 900

proof BELOW. A FREE MANUAL TOO.
page 47, see 4, CCFL jacks and HV supplies here 600VDC
free service manual with full schematics and BOM

https://elektrotanya.com/lg_w1934s_flatron.pdf/download.html


in my shop I have VGA signal generator to maKE WORK EASY.

press menu button and choose display source. like VGA/ DVI or Display port.

Hi there , if you can activate menu on screen , then try to change the video input source to something like VGA , and be sure that You've connected some video source with VGA cable prior to this. Sometime when there is no input signal (especially digital like HDMI) it flashes like that. Hope this helps .Cheers.

It depends on what type of connection you are using. If you are using a VGA (analog) cable then you need to select that mode on your monitor menu. If you are using a DVI (digital) cable then you need to choose that mode on you monitor menu.

Try a reset of the display device or hit the menu button to get a display on the screen- If you get a full picture that way then you have some setting set wrong. It could also be a PIP- picture in picture mode that you only have one source put into the TV rather than two.

first try entering VGA mode in the startup menu. u can get the startup menu by pressing the F8 key immediately after the POST screen. if the screen stabilizes try changing the resolution to 1024 by 768 which should work in normal mode. if that doesnt work then the monitors internal bulbs may be burnt. an electrician may fix this problem for you.

When you power up the computer Press and hold F8 key 5 to 6 times untill you see windows logo then you can see safe mode and other menu enter in enable vga mode then go to start menu->control panel->display ->property ->settings .
change screen resolution to 1024*768 then apply and ok.
Then check .
Let me know if you need further assistance.
Thanks for using FixYa.

Pressing the f8 key doesn't work either? This should boot the laptop to safe mode, if it doesn't then check the memory cards before you do anything else, try to get somebody with the same type of memory card to lend it to you. If that doesn't work, then your HDD is corrupted, and to re-install Windows.

there is a burned-in spot on the polerizer light filter for the blue lcd. it makes sure the light is blue coming through, that's why it is black on a blue screen, and yellow when the red and green are the only light showing through. it needs to be replaced. pat # PFiLW0213CEZZ.

Try this,Start in VGA mode.Once started,update your video drivers

To use a Safe Boot option, follow these steps:

1. Restart your computer and start pressing the F8 key on your keyboard. On a computer that is configured for booting to multiple operating systems, you can press the F8 key when the Boot Menu appears.
2. Select an option when the Windows Advanced Options menu appears, and then press ENTER.
3. When the Boot menu appears again, and the words "Safe Mode" appear in blue at the bottom, select the installation that you want to start, and then press ENTER.

Safe Boot options loadTOCNode(2, 'moreinformation');

• Safe Mode (SAFEBOOT_OPTION=Minimal): This option uses a minimal set of device drivers and services to start Windows.
• Safe Mode with Networking (SAFEBOOT_OPTION=Network): This option uses a minimal set of device drivers and services to start Windows together with the drivers that you must have to load networking.
• Safe Mode with Command Prompt (SAFEBOOT_OPTION=Minimal(AlternateShell)): This option is the same as Safe mode, except that Cmd.exe starts instead of Windows Explorer.
• Enable VGA Mode: This option starts Windows in 640 x 480 mode by using the current video driver (not Vga.sys). This mode is useful if the display is configured for a setting that the monitor cannot display.
  

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