nanao dual 8 (ms-8 25") screen size flickering

Can you verify the game pcb works 100% with another known good monitor? If it works than look into the monitor
 
From wiki.arcadeotaku.com/w/Nanao_MS8-29. The link also has schematics for 25" and 26" models, so hopefully the diagnoses are the same for all models. Does any of this help?

Repair

Looks like sync has gone but clears after a while or after repowering, also may encounter some size issues
Change C911 C913 C442

Poor colour definition with brightness issues, sometimes intermittent
Change C332

Monitor does not power up or cuts out
There are many reasons for this, here are some that I know of:

Check the fuses first

If you get a line across the horizontal and then the chassis shuts down then there is a fault on the vertical deflection circuit

Signs of frame foldover
Change C433 R433

If full vertical frame collapse then also change R436 Q401 Q402 C437
 
anode cap was coming off, that's what caused the image size flickering! so now I know what happens when you remove an anode cap from a crt while it's switched on :)
 
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