Viewsonic Optiquest Q71 Monitor Problem

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I am hoping there is someone here familiar with the internals of a
Viewsonic Optiquest Q71 Monitor. This one has very specific symptoms:
1) display is too bright
2) onscreen menu brightness control has no effect
3) display has white lines across it about 1 inch apart, sloping upward
to the right
4) one time only in last few weeks it produced a very good quality
picture when turned on, has not done it since.

Because of #4 I am hoping it is just an internal adjustment needed.
It's probably not worth replacing parts. Made in 1999.

Thanks for any help.
Dave
 
I am hoping there is someone here familiar with the internals of a
Viewsonic Optiquest Q71 Monitor. This one has very specific symptoms:
1) display is too bright
2) onscreen menu brightness control has no effect
3) display has white lines across it about 1 inch apart, sloping upward
to the right
4) one time only in last few weeks it produced a very good quality
picture when turned on, has not done it since.

Because of #4 I am hoping it is just an internal adjustment needed.
It's probably not worth replacing parts. Made in 1999.

Thanks for any help.
Dave
Click to expand...
Well a google shows it's a 17" CRT monitor - apparently still being sold
by Tiger Direct, at least, for about $145.
The symptom is typical of having lost the retrace blanking - and more
likely is due to a component failure (maybe a capacitor opened up)
than any adjustment. Blanking (and BRT control) is typically inserted at G1.
Since on screen BRT has no effect, it could also be a fault internal to
the tube itself, or an indication that the connection to G1 has been "lost".
The (slightly) internittent nature would tend to indicate an open
connection
somewhere - likely on the "neck board". May even be a cracked trace.
Could be oxidation on the tube pins, but that's less likely.

Either way, it would require the service of an expert to diagnose & repair.
Replacing the tube is likely not at all economically feasable - finding an
open circuit, &/or replacing the correct capacitor might be... Only one
way to find out . . .

Regards,
NGA
 
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