mv1a blank screen

[mr aize]

Hi all. So I've got an mv1a that's currently dead. Only sign of life is the led on the left side of the board, by the dip switches, lighting up when it's powered up. Nothing on the screen and no sounds. Any ideas where to start? Other than being dead, the board looks in good condition. Some very light corrosion on a couple of pins of the sound chip but other than that nothing. Worth changing out the caps and battery as a starting point? Thanks

 

[ack]

Make sure dip switch 8 isn't in the "on" position.

 

[mr aize]

thanks. Unfortunately it's off

 

[channelmaniac]

Flip all switches on and try again. Sometimes if the data bus fails just right it won't go into watchdog reset loops.

 

[mr aize]

hi, so I've tried multiple times with switches in all positions and no dice.... Any ideas as to where to start?

 

[ack]

Try the diag bios

 

[mr aize]

don't I need a sac cart for that?

 

[ack]

Just the bios chip on the MV1A. The cart is only needed if you want test sound.