MV2F Grapics glitch

[pierpa86]

Hello Guys,
Doing some repair on a mv2f that i buy for 30Euro....
It have some battery leak corrosion over ZMC.
After some line problem repaired the image start look normal but it seems one more contact somewhere is to be checked
Fix layer are ok, i'm not sure about one more zmc2 contact because i check every pin one by one, and they are all connected.
What can be the cause of that error ?

 

[pierpa86]

Error is the same on both slot 1 and 2.
Previusly slot one is not working because of one line of Neo-Go disconnected.

 

[ack]

Check pin 6 on the NEO-ZMC2, which is the 'EVEN' signal. It should come from LSPC and be pulsing. Pretty sure if its dead/stuck you can get what you are seeing.

 

[pierpa86]

Found the problem of the graphics error, was the ZMC2.
Replaced and now no more visual error.

Bad part is that now i have audio problem that is not expected.
I have distorted right channel.
Since i dont have any caps at home, i have changed YM2610, YM3016 and AMP. but no changes at all.
So i guess i have to order some caps

 

[pierpa86]

Find the little problem, after studied all sound schematics and follow CH2 signal....the solution was more simplier.
The damn volume slider Why didn't I measure it before and immediately go to think about amplification.
I think the problem is like when you have fever, and you google it, you end up thinking you're dying.

Anyway, one more MV2F fully repaired !

1xbroken ZMC2
1xZMC2 trace battery corroded
1xSLOT 1 battery corroded
1xVolume potentiometer

Thats all....