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Old 20th Jul 2019, 9:19 am   #11
SiriusHardware
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Join Date: Aug 2011
Location: Newcastle, Tyne and Wear, UK.
Posts: 11,482
Default Re: Commodore 1084-D2 Monitor Repair

Another left field suggestion - whatever it is is:-

-Periodic, but not synced to any other frequency in the monitor
-Of very short duration
-Powerful enough to disrupt the operation of indirectly related signal paths

Could this be something arcing - fault within the LOPT perhaps, or insulation breaking down across some other component or PCB path? Try getting the unit into a place of complete darkness, let your eyes adjust and see if you can actually see anything flashing over.
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