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Old 27th Dec 2017, 10:46 pm   #6
Refugee
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Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,549
Default Re: iMac G3 CRT display problem

You are thinking of delta gun sets.
It might be worth doing a recap on the video board that plugs on the back of the tube.
That used to be a stock fault on VGA screens.
They are an isolated chassis so if you are very careful a scope will show the problem as a change in the waveform either side of an electrolytic capacitor.
The video board is often stuck on to the tube base with glue so some care with a Stanley knife will also be required.
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