NM
(Topic ID: 86803)
Linked Games
Batman Forever
Sega, 1995
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Quoted from FreeBee:Well, I did some measurements just now:
4,88V at the connector on the DMD.4,92V at the connector of the 5V supply.
I've also noted some blanking now regularly, that would mean that the garbled image blanks out for a fraction of a sec and comes back up again. It kind of contradicts what I stated yesterday, that I did not see blanking, but now I do.
How can a working display degrade so fast?
Do you get the Batman and version number? Or is it always scrambled? Blanking out is a low 5v issues (resets start at as low as 4.85vdc!) but it doesnt scramble, just resets constantly....
i am going to agree with viper and say a RAM issue. These PCB for the large display is probably insanely difficult to work on, hopfully the ram is in a socket, and can be reached with out pulling the display glass. If so, i would try that as a non invasive fix.
How much ripple do you have on the circuit? Might be time to replace those four 4700uF filter caps. Maybe you get a few tenths of a volt more out of it.
.1v is an acceptable voltage drop across that connector, but 4.8v is borderline for the display. It will proably start resetting. For good measure i would still redo with trifurcon. Get rid of the loop style idc on the power board too. There is extra connector pin spots to individually crimp them on the power board from what i remember.
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