Working on a MM with fuses blowing on the sound / DMD board.

I returned the board to the workshow, but had trouble replicating the fault.  I did not have a dual tracking power-supply to power the audio amplifiers, so I was testing with current limited single supply…  no fault.

I finally jury-rigged two power supplies to provide both the positive and negative rails and bingo!  We have a short.

The TDA2030 was short circuit between the +ve and -ve rails.

These parts are no longer stocked by the mainstream electronic suppliers, but thankfully are readily available on eBay.

I ordered a new chip, waited the usual 4 weeks for delivery, and this board is now back and operational.

I did a little clean-up of the high-voltage on the DMD driver for this board.  Check out the soldering the last repairer left…

Bloody hell…  hats off for actually getting this to work!

Any-how, I felt obliged to clean this up a little without spending too much time on it…