James Sweet wrote:
Milhouse Van Houten wrote:
About three weeks ago, my PT795's screen went black, and the LED went
from its normal green (signifying full power) to an alternating amber
and green, for which the manual has no explanation.

At that time, power cycling cleared the problem, but yesterday it
happened again, and this time it's apparently for good.

Symptoms:
1) When turned on, the monitor makes its normal loud sound, but the
screen is always black no matter what.
2) When hooked to a working PC, the monitor's LED alternates between
amber and green at a half-second internal.

I've eliminated all other variables, such as the PC and cable.

The Viewsonic PT795 is an aperture-grille type, and it's been in use
since 1999.

Thanks for any ideas. I've searched online for the service manual or
any other hint about what's going on here, but have come up empty.



Look at the power supply section, the fact that it cleared up on its own
the first time makes me suspect that rather than a short elsewhere
loading it down. Could be as simple as a cracked solder joint, might
have some bad capacitors.

Try a little 'percussive maintenance'.

IOW, whack a couple of times. If you've got a bad solder joint, that
will often confirm the problem. It'll start up for some undetermined
period of time. While not a definitive diagnosis (it might still have a
bad joint, but not come on upon a couple solid blows), it works more
often than not. If it does, open it up and try to localize the issue.

jak