If it is something shutting down, could be a paperclip or something.
>
>>
>> While we're on monitor repair:
>> I picked up an IBM PS/1 SVGA which when turned on flashes a normal
>> screen for less than a second, which collapses and then displays a
slowly
>> degrading squiggly vertical line which gradually shortens and blanks.
>
>A MDA monitor does something like that on switch-off, but then that CRT
>has a rediculously long persistance phosphor...
>
>Do just check that it's not the main PSU shutting down (and leaving the
>monitor to run on the charge in some of the caps). Does the power-on
lamp
>remain on, for example (if there is one). What about the CRT heater?
>
>My guess is that the horizontal output stage is shutting down (but the
>EHT is staying up for some reason). Assuming that they are separate,
I'd
>start by looking at the horizontal driver and output stages, their
>operating voltages, etc
>
>Alas I don't have schematics for any IBM monitor apart from the first 3
>(5151, 5153, 5154).
>
>-tony
>
>
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Received on Fri Sep 25 1998 - 18:11:26 BST