I already opened a thread for voicecards issues somewhere, but this is quite different yet related :
Testing one of them, apparently led to a short - circuit at the output of +5 V regulator ( IC7 ) caused either by a problem on the card or by an undesired manipulation (the volume pot was left hanging on a wire and may have touched the Mobo)
The short has led to the breakdown of a fuse I added at the on/off switch spot and the LCD screen does not light up anymore .
After removing the defective card , I noticed that the short at the output of the regulator IC7 persists. Thinking that this circuit had been damaged, I changed it but the short circuit remains .
Could one or more integrated circuits on the motherboard be irreversibly damaged ? If so, how can I probe them ? Could the short-circuit have another origin ? (I double-checked solders on the Mobo).
Thanks in advance for all contributions, I must say it’s quite frustrating to step back from a working 3 voice-Ambika to “I don’t know what’s going on”…