4 Slot MVS board is stuck in the Grid Screen .....????

This is a 4 Slot Board I won from MD Games Auction a while back. It was a defective board, the auction described as only being able to pull up the Grid Screen and that is all it will do.

I can get the Hardware Test Screen up by pushing the Player 1 button and all tests seem to work fine.

Everything looks brand new with this 4 Slot PCB, I cleaned out the Slots and the Jamma Fingerboard.

Does anyone have any ideas why this board is stuck in the grid screen? <img src="graemlins/help.gif" border="0" alt="[Help]" /> <img src="graemlins/help.gif" border="0" alt="[Help]" />

I have put games in all 4 slots, games in each slot by itself, and I just get the same grid screen each time.

Any help will be great!

Thanks,
Robert

Here are the pics:

Reads like there is a conflict between your service or test pinout and your video ground..those pinouts may be connecting somewhere on the pcb throwing you right into TEST MODE on power up.
I just know you have dipswitch 1 in the off position..could'nt be that easy..
-BB

[ December 01, 2002: Message edited by: BIG BEAR ]</p>

BB,

Sent you a PM. About the grid screen.... it comes up the same when the dip switch 1 is ON or OFF.
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I just tried my Working 4 slot and it comes into the hardware test screen (when I turn OFF Dip 1).

With options like Setting up the Hard Dip, Setting up the Soft Dip...etc...

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Now on this 4 slot in the pic.... When there is a game in any of the slots it does not give me the same test options like my working 4 slot.

This non working 4 slot board does not give me those options when there is a game inserted.... Like the hard dip/soft dip settings,book keeping,setting up the code number...etc.....

I am guessing that is is not reading any information from the MVS game????

Mabey the dipswitch is broken??? I just checked all of the Dips 1-8 and they have tested good from the test screen.


<img src="graemlins/help.gif" border="0" alt="[Help]" /> <img src="graemlins/help.gif" border="0" alt="[Help]" />

[ December 01, 2002: Message edited by: Robert Wallace ]</p>

The MVS4 is not recognizing any of the cartridges. With no cartridge inserted, you will get the grid screen anfd hardware test without being allowed into setting the RAM exemptives.

I would look at the slots themselves for any corrosion oand then cracked traces or the buffers from one board to the other.