Jul 092017
 

Got this faulty Turbo Force PCB for repair:

 

First of all I soldered back an hanging wire:

Then I powered the board up : the fault concerned some sprites, they were scrambled:

The relevant data are stored in four devices :

Probing them revelead that some address line had abnormal activity (good on left of the below picture)

Address lines for the sprites devices are generated by one of the two surface mounted custom ‘VS8905’ (the one @U115)

I played the card of replacing it :

And this was successful, board fixed.

 Posted by at 7:28 pm

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