I have a Viewsonics VP920 that has been dropped. No sign of internal damage. It powers up and then goes to sleep after 10 secs. Power LED goes from Green to Orange. No components are hot. Screen is ok and displays a no signal message. If I cycle the power, it still runs for 10 seconds. It seems like the sleep timer period is wrong.
I have removed the back cover, C805 is 150 volts from a 110VAC supply. Tks for your thoughts!
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when the computer enter the sleep mode, it is possible that the computer remove the check mark from this output activation.
When you have multiple ouptut like a internal LCD and output on a monitor, when going into sleep then waked up, laptop reactivate the internal LCD without reactivated the secondary monitor.
you could need to go in desktop property and reactivate the secondary monitor with the check mark listed : Activate.
If you only have one monitor but still a dual output card or two separate video card same thing can happend. try to connect the monitor on the second VGA or HDMI output and see if the video goes there.
then reactivate your secondary output and make it principal.
Does also happend when your computer is connected to a UPS power and your monitor is directly on the sector. (laptop issu also)
if a brief power outage arrive then the monitor shut down (no power) and the computer continu, as there is no monitor on the output any more Windows will automatically deactivate this monitor. when power goes back, this output is no longuer providing video. I suggest putting the monitor on a UPS as well.
If the monitor is displaying the "Power Saving Mode" signal to the monitor, then the monitors internal VGA board is functioning, so you can rule out a broken monitor. However I have seen monitors blow the internal fuse to the VGA board which causes a false "SLEEP" signal. If this be the case then it will require replacement of the fuse (usually a microfuse soldered onto monitor internal board) or most likely a monitor replacement.
Option A: you can connect another monitor to the monitor output on the back of the computer and see if you get a display. If this monitor goes to sleep, then it is likely that your Video card is malfunctioning. If you get a display, then it is definately the monitor.
Option B: If you have another computer, you can attempt to connect the monitor to another computer. Also most modern laptops will be equipped with monitor output, so if you have one you can check it. If the monitor sleeps, then it is definately the monitor. If you get a display, then it is definately the computer video card.
The two most common problems with Viewsonics are bad capacitors on the power supply board and bad fluorescent lamps. If the background light comes on and then goes off after a second it's probably a fluorescent tube problem and not worth fixing. Capacitors are easy and cheap to replace. Bad ones look like tiny little AAA batteries with the tops rounded from heat and pressure.
Sounds like there could be a short in your video cable. I had this problem occur where i would boot up my pc and after about 5 seconds the screen would go blank. Also give your monitor a reset manually after starting up your box. Just unplug the power cable to it for about 10 secs and see if that helps. Good Luck
go to safe mode.. change the power settings for windows...
to go to safemode.. simply restart your computer.. then press f8 several times til you see the boot menu.,.. select safe mode.. from there.. you should be able to boot windows.. change the power settings in control panel