[ICOM] IC781 display problem

[Bruce]

Doug,
Check the power supply connection at the back of the CRT, it should 
measure about 12 Volts. If that checks ok then try using an external 
NTSC monitor plugged into the rear panel to see if video is still ok 
or is it in the video output circuit/section of the unit.
Icom no longer sells the CRT or parts..they have a replacement LCD 
for a ripoff price of $900 last time I checked.
There may be another source for the CRT elsewhere so an internet 
search may be in order..
Other than those items it could be a verticle output transistor is 
getting ready to go out..
73's
Bruce W7BCW
At 05:59 AM 4/18/2008, you wrote:
>My 781 has developed an annoying problem with the display.
>
>Sometimes on power-up, the display is compressed to a total height of
>about 3/4-inch, and jumps up and down like an old TV with vertical
>hold out of adjustment.
>
>Other times, the display is the right size, but the brightness jumps
>between two levels.
>
>Before I go digging too far, I thought I'd ask this group - has anyone
>seen this before? Is is a CRT problem, power supply problem, or
>something (or things) else?
>
>73,
>
>Doug K1DG
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