Godzilla Wars Jr Sound Issue

MasterFygar

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Finally got my final grail: Godzilla Wars Jr, the awesome animatronic redemption game by namco. Only issue is with the sound... it has none. All wires test fine with an ohmmeter, the speaker itself tests fine (and a test speaker gave the same results), the volume control appears to work fine and was tested on all settings, and the connectors are old but all show voltage... so it's looking like it's something on the PCB, which isn't specifically outlined in the schematic (just labelled as "PCB").

No visible damage on the main board, so I'm guessing it's a bad chip somewhere. What steps should I take next? The board is impossible to find as this is a super rare game, this is the second one I've seen in 10 years of actively searching... is there anyone who can repair a namco redemption board without a specific schematic for the PCB itself?
 
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Bump. If it helps, the board is Namco board #y112960101 and was also used in Ace Driver.
 
Thanks for the reply! I'll try that for sure. Am I correct that this would be the amp on this type of board? If so, the finger test gets me no response, though I thankfully know where to get a replacement for that particular chip.
 

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negative.
The amp is above and to the left of the circled IC (the large one screwed to the pcb) Chances are there is a volume pot nearby. A higher res picture would help me. The easiest way to test is to touch the leads on the solder side of the board under the suspect IC and listen for hum or pops from the speaker.
 
Have you measured 12 volt in the pcb? If that circled chip is M9810 (same as namco use in wacky gator too) forget to get a good one in the market, I tried and there`s nobody has stock, buyed some from china and didn`t worked. Its a waste of time... hope your is not the case and the chip would not be the cause of the fail
 
Thankfully, I started a thread for just finding the amp and it's a readily available sanyo chip, not the one circled above. I should be on the fast track to fixing it now. :) thanks generic for helping me know what to look for!
 
Just an update here in case someone with a similar issue googles this, it was indeed the amp, the thermal grease had dried up and it had burned itself out. The amp chip (LA4470) was easily replaceable and I added a 99.9% silver thermal compound to help keep it from burning up as well. It's still cool to the touch even when running now and sounds great! It was amazing to hear it again after all those years :D
 
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