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Author Topic: H Sync issue  (Read 887 times)

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mikew72

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H Sync issue
« on: July 08, 2022, 11:05:34 am »
I have a JAMMA cabinet with a 25" intervideo standard resolution monitor in it.

When first powered up, the horizontal sync always needs adjusting to get a stable picture.  Once adjusted, the image is fine until turned off and left for a while.  Next time it's turned back on it will need adjusting again.

I've tried it with my NEOGEO, a PC/JPAC and a Pacman clone JAMMA board.  It's the same on all so I'm fairly confident it's an issue with the monitor, though I can't rule out the JAMMA harness.

The monitor dates from 1992 so I was thinking of giving it a recap, but I was also wondering if the potentiometer on the adjustment board may need replacing too?

Mike
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grantspain

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Re: H Sync issue
« Reply #1 on: July 08, 2022, 11:47:54 am »
wise to do all you mentioned, check for bad solder joints as well
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Mike A

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Re: H Sync issue
« Reply #2 on: July 08, 2022, 12:27:21 pm »
Quote from: mikew72 on July 08, 2022, 11:05:34 am
I have a JAMMA cabinet with a 25" intervideo standard resolution monitor in it.

but I was also wondering if the potentiometer on the adjustment board may need replacing too?

Mike

Mark the position of the pot. Squirt it with deoxit. Turn it back and forth a bunch to clean it out. Fire the monitor back up and see if that helps.
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