Monitor III display problem, please help

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Joined: Dec 20 2003 - 10:38
Monitor III display problem, please help

I am trying to use my old monitor III (I am original owner) with my apple II plus. The monitor displays just a single line in the middle as pictured in the attachment. It does this plugged into the computer or not. None of the external adjustments do anything. Any ideas would be appreciated. Thanks

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Joined: Dec 19 2008 - 21:01
Re: Monitor III display problem, please help

Vertical collapse. It will require board-level repair. If you don't know how to repair old CRT monitors, you could maybe find an older TV repair person.

It's likely just old cracked solder joints, but it could be a component that has failed.

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Joined: Jul 9 2016 - 17:27
Re: Monitor III display problem, please help

Looks like the vertical oscillator is not running. let me find the schematic and find the vertical circuit.

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Re: Monitor III display problem, please help

Thanks. I appreciate the help

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Re: Monitor III display problem, please help

Were the ic is on the board.

the circuit on the schematic.

check for continuity between pin 3 of the ic and ground. the resistance should vary when you twiddle with the vertical hold. if it does not, there is your problem. but look for broken solder joints with a bright light and a magnifying glass, on ALL solder points, if there is one, there ARE MORE look for them.

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