Hi there, I have an EDM-020 CFI-1116A Disc Edition PS5. It originally had the 3 beeps on power which after grabbing a known working BIOS for this board and model it now will beep once every 20 seconds hitting the power button but will not turn on.
So far I have checked all voltage rails and everything seems to be present from 12v all the way down to 0.8v rails. However I am unable to connect to and read the UART and get error codes. Also something I found in my measurements is the bank of coils for the APU read 0.3ohms. Now I know that CPU/GPU lines have low resistance but I'm not sure it is meant to be on par with a direct measurement to ground. Is this a normal read or should I expect something more like 3ohms or higher? I want to sanity check this is an abnormal read before pushing voltage potentially into the APU.
So far I have checked all voltage rails and everything seems to be present from 12v all the way down to 0.8v rails. However I am unable to connect to and read the UART and get error codes. Also something I found in my measurements is the bank of coils for the APU read 0.3ohms. Now I know that CPU/GPU lines have low resistance but I'm not sure it is meant to be on par with a direct measurement to ground. Is this a normal read or should I expect something more like 3ohms or higher? I want to sanity check this is an abnormal read before pushing voltage potentially into the APU.