So this is the third of three AM4 motherboards I have here
This one is compatible with my A6-950 test CPU. The CPU socket looks good on this one and I can't see any physical damage
The SIO is an IT8686E, and I couldn't find the datasheet. There is 5V on the PS-ON switch but the ATX PSU does not get a start signal. Interestingly on he green wire from the PSU I get around 2.4V which very slowly increases - for example in the last 20-30 mins it has reached 3.05V. It does not increase continually like a charging capacitor but goes up and down as little bit - like it is taking one step back and two steps forwards.
If I wait till the voltage on the green ATX wire 'charges up' to say 3.10V then press the OS_ON switch, it goes back down to around 2.8V then starts its one step back two steps forwards increase again, but if I ground it to start the PSU, it does not drop back down in voltage, it continues to climb from where it left off.
If I ground the green wire to force start the PSU, the Fans start to run and the red CPU LED illuminates. The CPU fan initially starts at full speed then drops to a slower speed.
Really, Apart from the odd thing happening with the climbing voltage, it is acting much like the two boards I have with broken CPU sockets, but those are waiting a compatible CPU before I can move forwards with them.
I assume the IT6868E is responsible for starting the PSU and initialising the motherboard- should I just change it, or are there more things I can check without a datasheet?
This one is compatible with my A6-950 test CPU. The CPU socket looks good on this one and I can't see any physical damage
The SIO is an IT8686E, and I couldn't find the datasheet. There is 5V on the PS-ON switch but the ATX PSU does not get a start signal. Interestingly on he green wire from the PSU I get around 2.4V which very slowly increases - for example in the last 20-30 mins it has reached 3.05V. It does not increase continually like a charging capacitor but goes up and down as little bit - like it is taking one step back and two steps forwards.
If I wait till the voltage on the green ATX wire 'charges up' to say 3.10V then press the OS_ON switch, it goes back down to around 2.8V then starts its one step back two steps forwards increase again, but if I ground it to start the PSU, it does not drop back down in voltage, it continues to climb from where it left off.
If I ground the green wire to force start the PSU, the Fans start to run and the red CPU LED illuminates. The CPU fan initially starts at full speed then drops to a slower speed.
Really, Apart from the odd thing happening with the climbing voltage, it is acting much like the two boards I have with broken CPU sockets, but those are waiting a compatible CPU before I can move forwards with them.
I assume the IT6868E is responsible for starting the PSU and initialising the motherboard- should I just change it, or are there more things I can check without a datasheet?
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