Indiana Jones 'Special' Lights

KingOfTron

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So during the middle of game yesterday, the 'special' lights on both outlanes spontaneously turn on. I didn't make any shots to light 'special' and nothing happens (and nothing should happen) by rolling over them, but they won't turn off. The only way I can get them to turn off is by opening the coin door, which releases the button in there rendering the flippers useless. Any idea why these lights may have just suddenly come on and what to do to get them to turn off?

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remove and replace Q14 and see if that fixes it.
might even change out Q13 too (2N5401) while i was in there

(also, while eveything is out on the table before me is, i'd check and reflow all those header pins for cold solder joints, test all the electrolytic capacitors with my ESR meter and replace any that arent in spec, add all the wiring modifications found here:
http://www.pinrepair.com/wpc/index2.htm,
and i might even add the voltage regulator mod too for long life)

wouldnt keep the game on for very long until it is fixed as that whole circuit is stressed out because the transistor is shorted on and could take out other components
 
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Now before I go and start destroying things, is this large spiky black object Q14 and the small black object to right of it Q13? These are on the largest board in there.

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is this large spiky black object Q14 and the small black object to right of it Q13? These are on the largest board in there

the large black object is the heatsink, with Q14 tightly screwed to it with a white paste in there to help dissipate the heat away from the transistor

heatsinks come in all kinds of sizes and shapes. they all achieve the same goal of wicking heat away..... kinda like the radiator in your house is a huge giant heatsink

the nuclear reactor in Japan went out of control and melted because it lost it's heatsink, from the Tsunami

yes to Q13. its low power and doesn't need a heatsink

hopefully Q14 is your problem. if not, we hope Q13 is the problem. if not, the IC at U1 controlled by the computer could be toast. hopefully, nothings wrong with the CPU that controls the whole circuit
 
before I go and start destroying things

take that transistor out and put your mulitmeter on diode test and see if it's bad

try not to flex the board at all. treat it like your great-great-grandmothers ancient casserole dish and you should be fine
 
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If it is indeed Q14 that's bad, what's it called so I can find a replacement.
 
In the mean time, would simply removing the 'special' bulbs prevent any possible further shorts?
 
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