Nanao dual scan - Help!

Robotron Jon

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I have a Nanao dual scan monitor in my Indy 500.

Had a problem with vertical roll - could get it to stop once and be shaky but otherwise it was uncontrollable.

Took chassis and neck board to P&L monitor repair in Baldwin Park. They apparently hooked it up to a standard resolution monitor and the only thing they did was reflow some solder on the neck board and it worked in standard resolution, they claim.

Got it home, put it in the game, and still have uncontrollable roll. Could it be a problem specific to medium resolution? Could something else be causing the problem other than the neck board and the monitor chassis?

Any help is appreciated. Thanks.
 
Was the resolution connector moved back to the medium resolution plug after they tested it as standard res? If not, that's why it's rolling. Shut the monitor off and move the plug from LOW (15k) to HIGH (25k). If you move it with the monitor power on, you'll blow your HOT.


If it's on the right setting, this thing should be capped before any other troubleshooting, just to make sure the caps aren't the cause. I don't think much about a repair shop that just reflows some solder and calls it done, unless you walked in and said, 'fix it for as little cost as possible'...
 
Was the resolution connector moved back to the medium resolution plug after they tested it as standard res? If not, that's why it's rolling. Shut the monitor off and move the plug from LOW (15k) to HIGH (25k). If you move it with the monitor power on, you'll blow your HOT.


If it's on the right setting, this thing should be capped before any other troubleshooting, just to make sure the caps aren't the cause. I don't think much about a repair shop that just reflows some solder and calls it done, unless you walked in and said, 'fix it for as little cost as possible'...

It was on high. I replugged it in just to make sure there was no connection issue. Can a power supply problem cause my issue? Thanks for your reply.

In answer to your second question, I had it fixed at a flat rate so I can bring it back within 30 days and they have to fix whatever isn't working. I did noticed that some caps were replaced but not all of them. They test all of them and only replace I can fix some basic monitor problems but I already tried doing this one myself and got nowhere. This is a fairly expensive monitor to have repaired.
 
In answer to your second question, I had it fixed at a flat rate so I can bring it back within 30 days and they have to fix whatever isn't working. I did noticed that some caps were replaced but not all of them. They test all of them and only replace I can fix some basic monitor problems but I already tried doing this one myself and got nowhere. This is a fairly expensive monitor to have repaired.

Really? May I ask how much you paid these guys to replace a couple caps and reflow some solder? I know quite a few "monitor repair" places that just replace caps that fail an ESR check and call it fixed. I guess they don't think that other 20-yr-old cap isn't going to fail in the next month or two? Or maybe even on the next power up?

When I do a monitor repair, I charge $50 + parts + shipping for standard chassis (G07, K4600, K4900, K7000, 20EZ) and sometimes more if the monitor in question has a lot more parts needing replacement (like a D9200 that has 73 caps on it) that takes longer to do.

It's possible that all your monitor needs is the rest of the caps replaced. Or the controller IC may need replacement. If you have a warranty, take it back and have them test the EGA function. If they say they can't, ask them why not? If they offer repair for that monitor, they should be able to test it's function entirely. I know that I don't accept a repair job if I don't have the tools (or tubes) to verify the repair was complete....
 
It's P&L in Baldwin Park, they do probably thousands of monitor repairs every year. Tons of games have their repair sticker on the monitor chassis. A lot of people in So Cal (and KLOV) use these guys.

The flat repair rate is $65. Their price is usually $45 but this monitor is more.

I will call the guy tomorrow. If I go back to them and get the runaround I'll be pissed but I am hopeful that won't happen.
 
Just to clarify, I assume you already tried adjusting the hold pots? And you verified that the board you were trying to use used the sync you had hooked up (negative or positive)?
 
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