>>I have a 9 year old 17" Supermac monitor on which the screen
>>suddenly goes to white/bright light gray with visible diagonal
>>retrace or scan lines. Usually it does this after it's been on for
>>at least 20 minutes but sometimes within a few minutes of boot up.

[snip]

>>Can anyone diagnose these symptoms?
>
>if the lines are straight or checked it is a bad vramchip or bank, or
>if the cursor has flickering details otherwise
>if they are white lines angelled towards one corner slightly or just
>a little bit, it can be a broken monitor, but maybe the damage then
>isnt too bad, cause the tube itself is workin, maybe just some
>soldering or changing some resistor or so, old tv sets used to become
>that way - and on them this is a workable problem, BUT it could also
>be some other source, a tv nearby ?? another screen ??? the
>neighbours doing their own radiobroadcasts ??? a refrigerator or
>freezer close up that starts up every 20 minute or so ???
>
>L
>--


In the days of 68000 Macs it was either the analog board or the flyback
transformer going bad.

Charlie



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