Re: Dead oric 1
Posted: Fri Mar 01, 2019 7:55 pm
Well, usually you either got a picture full of scrambled (sometimes even colorful and flashing) squares and bars and the Oric does not boot, or it boots but hangs or makes strange things. Of course it may not generate an RF image and a SCART cable may help.
If the Oric boots it usually makes sounds when clicking keys (unless the AY or the amplifier or the speaker is gone). In fact it is the best way to check if an Oric boots when you have no picture. Just plug the lead, wait and press some keys to hear the click... then try ZAP or PING.
But both at the same time... that is bad luck. Moreover when you checked the regulator and discarded it. Even a diagnostic ROM wouldn't help.
It is really hard to tell, but the usual step here is checking all the VCC/GND pins in chips for 5 volt. Maybe there is a damaged track, a burnt chip or component, but it is indeed something that requires a systematic review. Starting for the components which are closer to the regulator. Maybe checking for continuity along the GND rack is also a good idea.
If the Oric boots it usually makes sounds when clicking keys (unless the AY or the amplifier or the speaker is gone). In fact it is the best way to check if an Oric boots when you have no picture. Just plug the lead, wait and press some keys to hear the click... then try ZAP or PING.
But both at the same time... that is bad luck. Moreover when you checked the regulator and discarded it. Even a diagnostic ROM wouldn't help.
It is really hard to tell, but the usual step here is checking all the VCC/GND pins in chips for 5 volt. Maybe there is a damaged track, a burnt chip or component, but it is indeed something that requires a systematic review. Starting for the components which are closer to the regulator. Maybe checking for continuity along the GND rack is also a good idea.