(Topic ID: 301195)

Shrek - flash lamp constantly on

By jb007gd

2 years ago



Topic Stats

  • 3 posts
  • 2 Pinsiders participating
  • Latest reply 2 years ago by jb007gd
  • No one calls this topic a favorite

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#1 2 years ago

Hi all, I'm a new pinball collector and this is my first post. I recently acquired a Shrek, my first machine. I've been going through it, changing the lights to LED and recently rebuilt the upper left flipper which was sticking.

I found the left rear flash lamp (the green one against the rear of the playfield) had been unsoldered. The other two (yellow and clear) work properly. When I reconnected it, the lamp was stuck always on. I replaced the lamp socket and actual bulb with the same results.

From poking around this forum it seems like replacing the drive transistor (Q25 on the driver board) is the next logical step. Could anyone who knows better than me confirm or deny my theory? Is there anything I need to know before removing that board?

Thanks!

#2 2 years ago

Yep. Most likely a shorted on drive transistor. That's why the socket was probably disconnected. Someone simply didn't want to mess around with changing the transistor out.

#3 2 years ago

Right on, I'll give that a shot. Thank you for the response!

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