After more than 20 years of troubleshooting analog circuits (mostly CRT tv ) now I have to deal with digital circuits ,which seem to be a dificult challenge .
Troubleshooting analog circuits is a step by step pleasant journey ,you start from the effect and advance to the root cause of the problem .
But for digital circuits I can t figure out what could be wrong ,the symptoms aren t giving me any clue , anything seem to be related to everything.
Last few days I enjoy reading stories from techs repairing arcade games like this
https://wiki.arcadeotaku.com/w/Game_Board_Repair_Guide and came up to a littlle strategy when dealing with digital circuits :
-check supplies ,better with scope
-check reset ,clock address and data buses
-faults to looking for :shorted inputs/outputs (to ground/Vcc or other pins) ,Ic's seems to be from far the often faulty components
software (ROM /FLASH content )
next as often are connectors ,shorted / open traces , soldering
discrete seem to be last to be checked (caps,resistors ,tranzistors ,diodes,coils)
As for tools ,logic probe seems to be obsolete for newer IC's working at low voltage like 1.2 or 3.3 volts
Any idea / tip /link apreciated