Gottlieb Street Fighter 2 Pinball Display Issue?

Fattrain

Member
Joined
Jun 26, 2009
Messages
137
Reaction score
0
Location
California
TECH: (FIXED) Gottlieb Street Fighter 2 DMD Issue?

I bought a brand new universal DMD display from pinballlife to replace my SF2 display that looked like it was going out (the typical "bad glass" look with faded characters e.t.c.).

I simply unplugged old display, plugged in new one (same connectors with same "pinning"). Turned on and VOILA no Screen?!?!?

Turned off, unplugged new screen, plugged back in old screen. Turned machine back on and still NO SCREEN!?!?

So i guess the common question would be what the hell happened?? haha

After a little research i found this and suspect this may be in the same "ball-park" as my problem...

http://www.pinrepair.com/sys3/index.htm#display

So has anyone else heard of this happening before or is it just my luck??
 
Last edited:
As these things get older, they don't take to stress as well as they used to. The new display may have put a little more strain on the high voltage section of the display board and it died. While I've never had the exact experience you have with a display, I have had cases where something else in a game died while another thing was being repaired!

Probably the first thing to do with yours is crack out the meter and test all of the power circuits to the DMD. Testing details are covered in the repair guide you linked to (if not, go look at the WPC guide, the test procedure is the same). If any of the voltages are missing or incorrect, it's time to rebuild the HV supply. I'd rebuild the entire supply, not just the dead section.


D
 
Probably need to rebuild the high voltage section of the DMD driver board. My Super Mario (which is also a Gottlieb System 3) had the same problem...after the rebuild it fired right up. With the System 3's, if someone plugged/unplugged the DMD with the power on, it can fry the high voltage section. That's probably what happened. Other machines you can do that with the power on, but not the system 3's.
 
With the System 3's, if someone plugged/unplugged the DMD with the power on, it can fry the high voltage section. That's probably what happened. Other machines you can do that with the power on, but not the system 3's.

I would highly recommend not doing that with ANY display.

Edward
 
I am not getting 62 volts.

Checked Q1, Q2 and Q5

checked C21, C23

Resistor R12 gives weird reading in board but when pulled off acts normal

All components seem to check out ok>.... Any thoughts??
 
Scratch that! All FIXED!

All of those parts tested fine and i was beating my head against the wall....

I would be embarassed to say that i did not check the fuses underneath first and even though it looked perfect it tested bad and VOILA! +62 Volts!

LOL

I'm a tool, but thank you FOR ALLLL YOUR HELP GUYS! Next time i will know where to look on these crazy System 3's!
 
Back
Top Bottom