I have a ViewSonic G810 Monitor and a few months ago I noticed that when I booted up my PC, it has a black shadow line appear vertically on the right hand side of the monitor during the initial Windows XP startup screen (the black one). When Windows XP switches to the Blue login screen, everything is fine (Monitor switches resolution/refresh I guess at this point as it clicks a couple of times).
Anyway, that black shadow line has gradually grown over the past couple of months and now cover the right 3/4s of the screen during the startup (completely covering the Windows Logo, etc..) however, when it switches resolution to the Blue Windows login screen, it goes away.
Most of the time, this is not really a problem as I do pretty much everything through Windows XP anyway, but when I need to boot into DOS, or attempt to get to the BIOS screens of my PC (pre-windows) I can't see a damn thing.
Anyone know what might be causing this and if it is repairable ?
(Unfortunately it's out of warranty now)
Many thanks,
Sparky
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If I am right I believe their is a transistor that does not switch properly and some one has posted a fix by reducing the base resistor down to about 15k. Search this site for Viewsonic.
Rich
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Hi,
your problem is in horizontal blanking pulses. Check signal
on pin 1 of P603 connector on CRT board. They must be nice and clean. If they are not, trace circuit back to main board.
You will find two or three small transistors. I beleive that
are Q431 and Q432. Check pulses on bases and collectors.
Most probably you will find that one of them has good pulses
on base and bad on collector. Change this transistor even
in looks good. I think it is 2SC1815.
That should fix this fault. I had this problem a while ago and successfully solved it.
Greg
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