Nanao MS9-29 (05A00675C1) horizontal collapse
- frsj8112
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Nanao MS9-29 (05A00675C1) horizontal collapse
Last of the three problematic chassis I have on the workbench.
First diagnosis: starts up with what looks to be a somewhat horizontal collapse
Did a recap and reflowed some areas.
I've replaced the LA7853
Still it's in horizontal collapse.
Any ideas @grantspain @PrincessPrinPrin ?
Cheers
First diagnosis: starts up with what looks to be a somewhat horizontal collapse
Did a recap and reflowed some areas.
I've replaced the LA7853
Still it's in horizontal collapse.
Any ideas @grantspain @PrincessPrinPrin ?
Cheers
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- grantspain
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Re: Nanao MS9-29 (05A00675C1) horizontal collapse
thats a strange fault, if you increase screen volts is the entire screen affected or only that small area?
- frsj8112
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Re: Nanao MS9-29 (05A00675C1) horizontal collapse
The whole screen gets brighter and retrace lines are visible all over the screen.
- grantspain
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Re: Nanao MS9-29 (05A00675C1) horizontal collapse
hmmm, maybe a fault in video decoder circuit
i imagine you tried a different video signal?
i imagine you tried a different video signal?
- frsj8112
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Re: Nanao MS9-29 (05A00675C1) horizontal collapse
You mean like 24kHz?
- grantspain
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Re: Nanao MS9-29 (05A00675C1) horizontal collapse
i mean a different game board
also have you tried adjusting h hold pot to see if that affects at all or h.position
also have you tried adjusting h hold pot to see if that affects at all or h.position
- frsj8112
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Re: Nanao MS9-29 (05A00675C1) horizontal collapse
Ok have tried the monitor with another gameboard and without a gameboard. Still the same type of collapse.grantspain wrote: ↑October 3rd, 2020, 1:48 pm i mean a different game board
also have you tried adjusting h hold pot to see if that affects at all or h.position
I've done theses things as well:
Replaced the Mitsubishi M51387P but still no difference.
Tried with another known working remote control board, no difference.
Moved the width jumper from normal to wide, no difference.
Toggled the Horizontal Hold 15kHz, no difference
On the remote control board, when dialing in the horizontal position pot, the column moves horizontally.
When dialing the horizontal width pot, nothing happens.
Too bad that the MS9 schematics are of such poor quality
- PrincessPrinPrin
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Re: Nanao MS9-29 (05A00675C1) horizontal collapse
Does pincushion adjustment work? Horizontal size limit (VR452)?
- copados33
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Re: Nanao MS9-29 (05A00675C1) horizontal collapse
Width / pincushion amp: 2SD1944 @ Q508 ???
&:
H-size IC: AN5551 @ U450
&:
H-size IC: AN5551 @ U450
- frsj8112
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Re: Nanao MS9-29 (05A00675C1) horizontal collapse
Issue has been resolved thanks to Sonic323 over at arcade-projects!
He had a similar fault and found a broken trace on the chassis, and my chassis had also a broken track
He had a similar fault and found a broken trace on the chassis, and my chassis had also a broken track
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