Nanao MS9 - Vertical Collapse

zed7

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Hi everyone, I have a Nanao MS9 that has vertical collapse and then goes into protection.

I've replaced the vertical IC (twice), the sync IC, as well as C402, C406, C407, and C408.

I'm unsure what else is a common failure rate for the MS9 that is involved with the vertical deflection, which is why I'm here for help.

Any advice is appreciated, thank you!
 
Did you ever figure this out? I'm in the same boat. Vertical IC replaced with a known working one, all caps replaced and the whole board meticulously cleaned.

Checked continuity on all replacements and made sure remote board is connected. Still have frame collapse and your the only person I've seen anywhere with the same issue.

I've done a few MS9s in the past with the same symptom and this procedure has always worked. I'm stumped.
 
I did not. Eventually, I caved and bought a known working chassis after both ones I had failed to fix themselves. Even the working chassis isn't perfect, I still have to look into it someday :p
 
Bummer. Do you still have it? If I do work out what's wrong I'll reply here.

It's a shame the shematic for this chassis is blurry enough to make your eyes bleed, It'd be pretty helpful about now. I may work on redrawing them to help this and future repairs.
 
I do. I may have turned it into a parts chassis, I don't remember. If I did, it's easily reversible anyways


I'll check R425 one day, thanks for the input on that !
 
For anyone else having this issue, check R425. It should normally read 100ohm but in my case

The manual states that R425 is a fusible 100 ohm 0.25W resistor. There are a couple of this type of resistors around the board, with different resistance- and power ratings. They are mounted around 15 mm above the circuit board.

I thought this should be mentioned to avoid any injury... (Not even mouser seem to sell these resistors though.)
 
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