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Shorted Transistor??

Spandangler

Spandangler

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10 Years
Joined
Jul 21, 2011
Messages
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Location
Suffolk
Hey guy’s
Last night whilst playing space station I noticed the right side flashers came on and stayed on. At the same time I lost flippers.
Turned off immediately and checked Q32 which controls the right side flashers and low and behold it’s shorted. F7 on the aux power supply was also blown.
However when I disconnect J11 on the mpu the short disappears.
So is the transistor ok? and the issue is on the playfield? Or is this normal behaviour?

In other news I tried to reboot it with J11 unplugged and a 5a circuit breaker on F7 and the aux power supply went pop big time.
I think I may have shorted the croc clip from the breaker to the BR.🙈🙈🙈.
I’ve removed the aux board and it still boots and attracts with displays so thankfully I haven’t toasted the mpu as well. Anyone got a spare they wanna sell

39133773-FE82-4994-8D27-1AB2DAE24093.jpegA2FCD4E7-DA4A-4DE2-87E3-99A8FFF0E956.jpeg
 
If Q32 is on the MPU is there an associated TIP36C on the aux power board?
If the TIP36C is shorted then testing the transistor on the MPU will also register that as shorted even though it's OK.
Test the transistor with the aux power board disconnected and it should test OK.

Good work on destroying that trace btw[emoji3] Doesn't look like it would be a difficult fix though tbh[emoji846]

Sent from my SM-G960F using Tapatalk
 
I bought one of these recently off Amazon UK for about £17. Diagnosed a FUBAR TIP36C on my TFTC so I'd say everyone should get one. Great bit of kit.

Screen Shot 2021-09-12 at 18.45.13.png
 
Andy_B said:
If Q32 is on the MPU is there an associated TIP36C on the aux power board?
If the TIP36C is shorted then testing the transistor on the MPU will also register that as shorted even though it's OK.
Test the transistor with the aux power board disconnected and it should test OK.

Good work on destroying that trace btw[emoji3] Doesn't look like it would be a difficult fix though tbh[emoji846]

Sent from my SM-G960F using Tapatalk
Click to expand...
🤣 thanks.
The short comes and goes depending if 1J11 is disconnected. It’s fine with it disconnected. Plug it back in the short returns. Haven’t tried with the aux board disconnected though.
 
Spandangler said:
[emoji1787] thanks.
The short comes and goes depending if 1J11 is disconnected. It’s fine with it disconnected. Plug it back in the short returns. Haven’t tried with the aux board disconnected though.
Click to expand...
Try it with 1J11 connected and aux power board disconnected.

Sent from my SM-G960F using Tapatalk
 
Andy_B said:
Try it with 1J11 connected and aux power board disconnected.

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Click to expand...
Ok so with J11 mpu connected and aux board connected I get a short. When I unplug aux board, short disappears.

im pretty sure now the flashers are shorted to the gi as they flash with the ac gi relay.
 
Is there an associated TIP36C on the aux driver board? If so test it with aux power board disconnected.
I had the same problem once and this was the issue. (I forget the game[emoji1])

Sent from my SM-G960F using Tapatalk
 
Andy_B said:
Is there an associated TIP36C on the aux driver board? If so test it with aux power board disconnected.
I had the same problem once and this was the issue. (I forget the game[emoji1])

Sent from my SM-G960F using Tapatalk
Click to expand...
Andy, guess whose buying you a crate of beer next time we meet………
Me, that’s who.
You bloody legend we’ve only gone and fixed it.
I need to listen more attentively. Sorry I skipped over that.
And it would seem my aux power board survived the fire with a few jumper wires 🤣🤣🤣.
Thanks all. This forum rocks 🤟🤟🤟
 
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