(Topic ID: 263711)

Doctor Who Blowing Audio Board Fuses

By PinballGurus

4 years ago



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#1 4 years ago

I picked up a Doctor Who that was DOA. I checked replaced batteries and noticed there was a lose wire grounding out the middle battery (see photos) and causing it to get very hot. I removed the wire and replaced the batteries and game turns on and I can start a game, but no sound now, so I check the fuses on the audio board and they were both blown, so I pulled the audio board and there was a clearly a blown trace on the back of the board and a couple blown capacitors too. I fixed the blown trace and put new fuses in and both fuses still blow upon start up. Has anyone had any similar issue with this machine. It looks like I will need to pull the other boards and see if that hanging wire damaged something else or if that was just a strange coincidence, but the game works now except the sound board blowing fuses.
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#2 4 years ago

All the test LED lights are correct.

#3 4 years ago

The contact on the battery holder is corroded, broken or partially missing. Someone made a quick fix by soldering in a wire. It should be replaced or install NVRAM and do away with the batteries altogether. I don't think that had anything to do with the audio board but I am not sure. I had a sound board burn a trace just like yours and the bottom speaker in the cabinet was shorted. It damaged one of the voltage regulators also. The sound boards are not my favorite to repair.

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