Nanao MS9 - brightness jumping

ninn

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Hi!

My candy got monitor-problems. I'd like to fix them.
As far as I know, it is the stock monitor for a new astro city, the Nanao MS9. I will verify that again, when I am back at home.

The problem is pretty easy to discribe, but I was not able to fix it till now. I am still thinking it is a connection problem, somewhere.

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symptoms:

When I first saw the problem, I looked a lot like just a slight flickering in brightness. I talked to the previous owner about it, and he said that a connection may became loose at the transport before - and then the picture disappeared completely. He then slapped the candy on it's right side. To my surprise, that highly sophisticated technique worked and the picture came back.

At home, I tried locating the monitor cables and reconnect those and the plugs and the remote board - and that seemed to fix the problem (for at least one night).

The day after, yesterday, the problem started to happen again. Since I already fiddled with the remote board settings - especially brightnes and contrast - I found out that the picture would not completely black out, but instead it 'just' looses about 50% in brightness when the problem occours. It is possible to compensate this effect with turning up the brightness - but when the problem vanishes, the picture will become far to bright. It looks a lot like someone turned on a light bulb on the monitor's inside.

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I still don't think it is a serious problem, more of a loose connection type problem.

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I already tried to find a solution in that forums, and this is the best match so far - sound like a very similar problem: http://forum.arcadeotaku.com/viewtopic.php?f=4&t=10590&p=137545

This has been posted on arcadeotaku too: http://forum.arcadeotaku.com/viewtopic.php?f=4&t=21606

Got any ideas? Can ou help me locating where I may look for loose connections? replace caps?

Thanks in advance,
ninn
 
Out in the field the fix for this was to do two things.

Theres a jumper connector on the chassis that changes the monitor from 15khz (std res) to 25khz (EGA). Theres also a small circuit board near the pots thats mounted at a 90 degree angle to the main deflection board. DESOLDER both of these then add new solder to the pins. Fixed them every time.
 
I can confirm that this fix works like a charm. This issue was driving me crazy until I read this thread. Just fixed my Nanao that had the same problem.

Thank you 'gamefixer'

Out in the field the fix for this was to do two things.

Theres a jumper connector on the chassis that changes the monitor from 15khz (std res) to 25khz (EGA). Theres also a small circuit board near the pots thats mounted at a 90 degree angle to the main deflection board. DESOLDER both of these then add new solder to the pins. Fixed them every time.
 
I can confirm that this fix works like a charm. This issue was driving me crazy until I read this thread. Just fixed my Nanao that had the same problem.

Thank you 'gamefixer'

Yeah, thats an odd fix. You would think that simply adding new solder to the mix would be enough but its not.

Glad to read that it worked.
 
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