MV1C Unknown problem

[Dr. Meat]

I've got a MV1C that I'm wanting to repair. I'm not sure what's wrong with it, though.

Whenever I power it on I get this.

I've cleaned up everything I can, checked for any broken traces, and made sure everything looks good on the board and I can't see any faults with it.

I can't tell what might be wrong with it and much less what to do about it. Any ideas?

 

[Xian Xi]

Probably palette ram related.

 

[shadowkn55]

Could be some cold solder joints on the GRZ.

 

[mainman]

Could be some cold solder joints on the GRZ.

This

 

[Dr. Meat]

Is there a good way to identify a cold joint? I'm not seeing any dull looking solder joints or any pins coming up.

 

[Xian Xi]

Does the problem go away if you tap on the GRZ? If they do then you have some lifted legs from the cold joints.

 

[Dr. Meat]

No change. I tapped and pressed all of the chips on the board and nothing yielded a result.

 

[BIG BEAR]

Make sure NO corrosion has eaten anything away.Check the legs of four flat packs in front of the cartridge slot and check the underside for missing components.
BB

 

[Xian Xi]

No change. I tapped and pressed all of the chips on the board and nothing yielded a result.

How are you looking at the pins? With a magnifying glass? Look for loose pins. I usually use the back of an exacto knife to gently push each pin.