Electronics > Repair
Fix vertical hold on a monochrome monitor
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PKTKS:

--- Quote from: rea5245 on June 11, 2021, 04:59:26 pm ---The only IC is a 74LS86 - a quad XOR gate. Everything else is discrete.

--- End quote ---

For that shit  you need a 4 chan scope and a lot of patience.

Paul
rea5245:

--- Quote from: PKTKS on June 11, 2021, 05:04:27 pm ---For that shit  you need a 4 chan scope and a lot of patience.

--- End quote ---

I'm more worried that I need more knowledge of analog electronics than I have.

- Bob
BrokenYugo:
Without a schematic for the forum to look at and guess the trouble point you're pretty much reduced to tracing the V sync signal and sketching out that partial schematic, and figuring out where it gets weak to pinpoint the faulty area.

Another thought, are you certain it's the monitor and not the equally old display adapter driving it? A scope of any sort will be useful here.
rea5245:

--- Quote from: BrokenYugo on June 12, 2021, 07:21:41 pm ---Another thought, are you certain it's the monitor and not the equally old display adapter driving it?

--- End quote ---

Well... no... now that you mention it, I guess I'm not certain. I don't have another monochrome monitor to test with the PC.

I have a scope though. What would you suggest I look at? The vertical signal, and whether it has a rock-solid frequency?
BrokenYugo:
Without looking up the standard my assumption (a dangerous word) would be there should be a 5V TTL signal on the port and it shouldn't be distorted much when the monitor is plugged in.
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