Tempest, no picture, monitor shutdown, fix

telmnstr

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Nov 18, 2006
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Virginia
Symptom was the video went away. Red LED shows screen protection active on monitor.

No 6.8vdc seen at the test point.

Diode and resistor that generate +6.8vdc from 15vdc were not the culprit. Noticed resistor was hot.

Checking the 4 ICs that the 6.8vdc drives, found one of the MC1495L ICs was getting really hot.

Replaced with new chip and socket, and picture came back and game is working again.


Have issues with wavy screen and the screen alignment ha a curve going towards the center across the top and bottom, Grrr. But screen is back. I don't think this is related to the failed component.
 
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