Stun runner thumping sound after replacing power supply.

zoog

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I picked up a stun runner where the board LEDs came on but had no image or sound. I just replaced the power supply. Now, when I power the game on, I'm getting good numbers on the multimeter. As soon as I connect the ps to the board, my numbers tank and the speaker rapidly thumps. Also, my board LEDs aren't coming on. Any ideas?
 
I picked up a stun runner where the board LEDs came on but had no image or sound. I just replaced the power supply. Now, when I power the game on, I'm getting good numbers on the multimeter. As soon as I connect the ps to the board, my numbers tank and the speaker rapidly thumps. Also, my board LEDs aren't coming on. Any ideas?
Sounds like you have a shorted component on the board, which is dragging down the voltage.

See which chip is getting hot - look at the rectifiers first. Be careful, you can be burned they can be so hot.
 
Thank you! I'll look into that. I should've also mentioned that the coin light also started flashing with the thumps.
 
Probably a ground issue like rt superbikes is notorious for. Had to put a filter on audio line to eliminate. Maybe will work gpu you.
 
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