Batman Forever - Help, My DMD goes mad !

Hi,

I have a new problem with my Batman SEGA, the DMD starts blinking during the game, then becomes dark, then displays the software version, dark again. And the game goes on but with a totally uncontrolled display.
Same when I go to diagnostics. I get the main maintenance menu. Then any button I press does not affect the screen (although it might does it in reality).

Except when is starts going wrong, the screen behaves normally as expected from the game.

Does someone have an idea for me ?

Thank you in advance

Not much support I found that the 5Vdc might be a problem. I only measure 4,88 vdc on the board connector. On pinball repair guide, such behaviour might be the consequence.
I ordered the BF manual with schematics ... In the meantime, what can I have a look to ? I am absolutely not Sega litterate

thanks

Hi jsalce,

No the kit is not installed and worse the connectors were hacked.

Thanks a lot for your valuable input an links, this pin is a piece of art for me

thanks, Is the bride rectifier a standard part or do I need a specific ref number ?

No, I ordered from Marco. Takes a bit of time to come to Belgium. As advised above I wanted also to replace the bridge rectifiers, but I do not know whih reference to order. thanks

I received the kit this morning from Marcos. I have executed instructions. I get voltage on the display board, but still too low.

Here are the pictures. Measuring voltage between the newly added loop wires (red circle) on the power supply board, I get 4,88Vdc. On the back of the display board, 4,84vdc between pin 1 and pin 3.

1. I have a loss between the power supply board and the display board.
2. On the power supply board, I still do not have 5vdc.

Suggestion for a next testing step ? Bridge rectifier, any other ? I read in the baywatch schematics that 18Vac goes to BR3. Where is this part ?

thanks

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thanks a lot for the info.

I am coming back with my problem. After I read the thread carefully and analysed the schematics, I tested the DC voltage on the test Points (not the connectors) of the power supply board. I put the black lead of the DMM on the ground strap in the backbox and red on +12, I get +11 and for the +5 I get +4,90.

I measured lugs of DB1 (bridge rectifier) but I am lost in the interpretation of what I read on DMM.

Thanks for further help

Only to keep you updated, I am not proud of myself.

When replacing the BR DB1, I removed the metallic tracks surrounding the holes into which lugs come. As a result, no more soldering point for the lugs. I hate this, it happens sometimes with common male connectors.

What am I doing wrong ? Using a desoldering pump, the temperature of the iron is 400° briefly on the board

I will go for a new XPIN PS and see if 5vdc goes to the display board

thanks, I have placed an order at Xpin and waiting for the price incl shipment outside of the US.

Yes the guy is 100% ok. I purchased once a pin with a defective Xpin board (did not purchase myself), he sent me a rep'acement one for the shipment fee only. Great!