I think it’s the power diodes where the 12v comes in. I think there are three. Lower left corner of the board.
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Quoted from JT-Pinball:How about I pay you for your time and you help me out if I get in a jam? The fun of this for me is bringing life back into these games I loved as a kid for my kids and there kids to enjoy. The more I learn the easier it is for me to do that. Thanks for all your help on Pinside! Its nice having folks like you here.
Lets try to solve it on here first.
Quoted from alexanr1:I am by no means even an intermediate level repair guy when it comes to pin boards. That said, one thing I look for first, is stable 5v and 12v. When I hear reboot, that’s what I immediately think. A simple multimeter can check both. Too low 5v and the MPU can act up. Many times the capacitors that provide a stable flow of power just wear out.
Additionally, any chance I get to reflow connectors, I do as well. Tends to fix many ghosts in the machine....
One final thing. If you have the original MPU in the machine, i hope it doesn’t still have the original battery on it, does it?
- My MPU was destroyed when I bought my machine years ago and I put in an ultimate MPU.
If you don’t have this, a great reference tool as well.
http://www.pinrepair.com/bally/babypac.htm
Go with jj44114 suggestions first though, much more knowledgeable on boards than I am!
I agree on the 5v for the video section. Might be failing. Power on, let it sit, see how hot the regulator gets.
You said " If I reboot it it would flash twice and stop". Based on that I think the audio portion, including its voltage regulator(VR2)is ok. Focus on VR1 checking voltage at test point 2. It's the one that supplies 5v to to the video section of the board.
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