On Sep 25, 4:22 pm, "hr(bob) "
wrote:
On Sep 25, 12:25 am, wrote:



Hey Folks,

I have an Viewsonic PF775 CRT monitor on an older computer. This is my
linux play box/secondary computer (ie, I don't want to spend a bunch
of money on). Went to fire it up and the monitor came up blank, though
the power light still comes on. I read SAM's repair FAQ athttp://www.repairfaq.org/sam/crtfaq.htmaswell as this brief article
athttp://www.pcsupportadvisor.com/Troubleshooting_monitor_problems_page....
Though I'm pretty comfortable with microelectronics (when I have a
schematic), I'm out of my league trying to debug a CRT cold. Couple of
questions though.
1) I have a 2 yr old son that may have managed to find the contrast/
brightness controls in the setup menu. I imagine though that the setup
menu would still be visible even if these controls were set way out.
Can somebody confirm this for me?
2) I've done a pretty close inspection of the main PCB looking for
cold solder joints or signs of overheating. Is there any other simple
steps I could take before I send this for recycling? I'm debating
trying to probe the transistors for shorts, but would kindof be going
after the problem blind. Any suggestions where to start?

The other clues I can provide a
a) Monitor was working fine last time I used it. The PC/Videocard
works fine with other monitors.
b) There is some sounds when I turn the monitor on as it powers up. It
may be the degaussing. I can try describe these better if they seem
relevant.
c) Sometimes when I turn it off, there is a flash of blue light in the
middle of the top 3rd of the screen.

Given that a 17" LCD is only $180, I don't think it would be worth the
money to pay for a repair, but I may get a quote anyways. I love to
both learn and tinker, so if I do get some insight I may really dig
in. Certainly any opinions are appreciated

Thanks in advance for any help.
TMFS

Just to make sure it is the monitor, and not the PC to which it is
attached, try a second monitor before assuming it is the monitor that
is at fault.

Two-year-olds can do some wonderful things, maybe he/she can undo
whatever they did G.

H. R. (Bob) Hofmann

Sorry, should have noted that I have already tried a different monitor
(which worked fine). I also hooked this monitor up to a known good PC
just to be conclusively sure that it is the monitor.

Darcy