Wizard of Wor cycling w/garbage on screen

dansch

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Wizard of Wor cycling w/garbage on screen (video)

I have a misbehaving Wizard of Wor upright, the game powers up but immediately starts cycling with one high-pitched beep and a yellow garbled screen.

Here is a short YouTube video showing the problem: http://www.youtube.com/watch?v=vHUOtUO0Fq8

The +5 line is good at the power board and I've pulled and cleaned all of the edge connectors from the PCB cage.

Any suggestions what to check next?

Thanks,
-Dan
 
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The +5 line is good at the power board

sure looks like a voltage is missing going to the game PCB. i'd re-check for the +5 volts on the game board PCB just after the connector and even before the connector. that would tell you what if any voltage drop you are getting through that connector. just because you have +5 volts at the power board doesnt mean you have it where you need it on the game board.

if that does check out good then id take the ROM's off and clean the little legs there and reseat them in the sockets.

oh yes and welcome to the madness !!!

:)
 
sure looks like a voltage is missing going to the game PCB. i'd re-check for the +5 volts on the game board PCB just after the connector and even before the connector. that would tell you what if any voltage drop you are getting through that connector. just because you have +5 volts at the power board doesnt mean you have it where you need it on the game board.

if that does check out good then id take the ROM's off and clean the little legs there and reseat them in the sockets.

oh yes and welcome to the madness !!!

:)

Thanks for the pointers. The +5v is indeed good at the connector on the PCB cage, I did discover that the reset line is pulsing in synch with the reboot - something is wrong with the power PCB that is triggering the reset.

I forced it high by jumping to the +5v line and the rebooting stops, however it just comes up to that scrambled yellow screen so I have more than one issue going on with this game, what fun!

Has anyone here every troubleshot the reset circuit on this game?
 
Besides +5VDC....that board also needs -5VDC, and +12VDC to operate.

I doubt the reset circuit is bad. Your board set is "watchdogging". Basically, it's resetting over and over. The motherboard is getting "lost" in it's normal routine....thus it resets.

Edward
 
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