Quoted from Holy-SNES:Hey guys, I have an issue with my Pinball 2000 Revenge From Mars Power Driver Board.
I have 2 driver boards and when using the good one, everything works perfectly, so it's not the wiring or anything related to the cabinet/playfield.
With the faulty one, having everything plugged in, the lamps (LEDs installed) are melting. Fuses 111 and 112 (18V lamp fuses) blow after a while. I believe it's sending the 18V constantly to the lamps (transistors aren't switching off?).
With the playfield connectors completely unplugged and only the power connectors plugged in (J102, J103, J104, J105), the fuses don't blow. I'm doing all my testing from now on with the playfield connectors unplugged and only the power connectors plugged in.
All voltage through the fuses, and diodes test fine. 18V test points read 24V, which I believe is normal without load (matches my good board). But here's where I find a difference between my good and bad board.
Good board - With parallel cable unplugged, Testing voltages on the lamp connectors J106, J107, J108, J109, all bottom rows read the same around .5V All top rows read roughly 0V (or around .001). By bottom row I mean the bottom row of each 4 connectors, not the 2 bottom of connectors.
Bad board - With parallel cable unplugged, Testing voltages on the lamp connectors J106, J107, J108, J109, all bottom rows read the same around 24V (except J108 and J109 which read .5V on pins 7 and 8). All top rows read 24V.
It's as if the transistors are all on and are pushing a constant 24V to the lamps.
All transistors TIP102 and TIP107 test good.
All resistors test good.
All diodes test good.
The 32 resistors in a straight row down (connected to the 2803 at U24 and U27) get very hot. So hot that there's browning in the board underneath them. As does U24 and U27.
I believe this may be a logic issue, but I'm not sure where to start testing.
I have a DMM, Probe, Scope, /soldering/desoldering Station etc, so I can comfortably test or change chips. I just don't really know pinball 2000, and it's lamp matrix seems a little confusing.
Any help would be greatly appreciated.
The board also has another issue where on boot it goes straight into menu and scrolls down. I'm not sure if this is related to the lamp issue though.
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Any solution? Did you fixed the heating problem?
It seems that my power driver board has a similar heating problem form the lamp transistors.
I located Q34 which gets very hot and maybe one or 2 from the same transistor row. I am not sure which of them.
Would be great to hear if you were able to fix it.
Euless, TX
