My screen keeps displaying.

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.

Usually you can the change sleep duration time from settings>display>sleep. Hope this is helpful.

I am sharing four cases in which your tv either turns itself off or appears to turn itself off.

TV appears to be off

• You using your tv as a monitor or your pc is in sleeping mode.
• Your cable or satellite Box is not outputting a signal.

TV turns iteself off

• The sleep timer is set.
• The off timer is set.

Your tv appears to be off:

If you are using the tv as a monitor If you are using tv as a monitor and the stand-by light only
blinks for a few seconds when you press the power button,your pc is in the sleeping mode. To take your pc out of sleep,press a key from your key board or move the mouse.Tv turns on.

If you are using TV with a cable or satellite Box

If you have a cable or satellite Box your Tv may appear be off because the cable or satellite Box is not outputting a signal.Press the guide or info button on the cable or satellite Box remote control.

if the screen displays info or guide data,the problem is caused by the Box,you must call your cable provider.
if screen does not display info data,change the source on your TV.

You may need to send in unit for service because your unit is unable to go to sleep mode when the signal cable is disconnected or the PC is turned off. Please call ViewSonic Customer Care for support.

Although this will not hurt the monitor, you just need to apply an active video signal to get a display correctly. However, it will not work as expected to go into sleep mode. You'll need to call ViewSonic Customer Care to get this taken care of.

Does it turn off or go to sleep? If it turns off , there may be a setting that needs to be reset or reprogrammed. If it goes to sleep because of inactivity, just move mouse to awaken it

One possiblility will be the failing power supply due to bad caps (leaking/bulging tops). You can take a look inside first before making the decison to buy a new one or not.
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague

it turns on as a "self-check" but if it doesn't get a correct input signal it goes to sleep.
Or you might have it going to sleep in settings.

Check to see if the power light stays on or blinks when it goes off. blinking means sleep mode

If you set the PC to go to sleep after certian amount of time than it will not put out signal to the monitor. You need to go to display properties (right click on the desk top)/screen saver -power/set the display to never turn off.

well it's not the computer going to sleep but the monitor is (sort of) because your computer is telling to. it has to do with the Power Options (title dependent on OS - this is what it's called in Vista)

Go to Control Panel>>Power Options - on the left hand column click Choose when to turn off the display - I'm guessing you are set to 15 or 20 minutes for the Turn off the display dropdown - change it to something longer to satisfy your needs (Never is an option).

If you're not running Vista write back - it's slightly different but similar path.

Cheers.

Z

If you go to control panel > display settings > Screen Saver > Power (win XP) or Control Panel > Power Settings (Vista).

This will allow you to turn off the sleep or change the amount of time until the computer goes to sleep or turns the monitor off.