I picked up a 1 slot neo geo mvs in a 25" dynamo cab today. I get it home and plug it in and see this. I tried to adjust a few knobs with no change. The monitor is a Philips mo8x. Im still Fairly new to this so any help would be much appreciated!
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I'd first inspect the yoke/rings on the back of the tube to make sure they're still attached/tight.