Defender sync woes

andyman

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Coventry, west midlands, United Kingdom
I have a Defender CPU board that will not sync to any of my monitors, tried 3. t's the horizontal sync that is affected, there is a tiny window where the picture is stable but it jumps repeatedly sideways.

Any ideas ?

TIA
 
I have a Defender CPU board that will not sync to any of my monitors, tried 3. t's the horizontal sync that is affected, there is a tiny window where the picture is stable but it jumps repeatedly sideways.

Any ideas ?

TIA

I would start by looking at the 7486 @ 3A and work backwards from there.
 
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