Hi there, I have an Xbox One original in which I have all the 1.8v, 3.3v and 5.0v standby power rails present, however my 12v rail is not turning on and the enable signal PSU_V12P0_EN from the SMC to turn the power supply on is missing. There is high resistance on this line so it's not shorted directly to ground which leaves me with not many options.
Was looking at a schematic and see the enable is created by the SMC. I have 3.3v on SMC_RST_N_IN but I'm a little stuck on where to look next. Is it likely that the SMC has gone bad or am I missing something else (it's my first time with the original xbox motherboard)?
A visual inspection of the board reveals nothing that stands out of the blue and overall looks in fairly good condition aside from a light dust build up as expected.
When I press the power button the white LED comes on for a second before going off, and the light on the PSU is yellow, only goes white for a second when I plug it in and switch it on.
Was looking at a schematic and see the enable is created by the SMC. I have 3.3v on SMC_RST_N_IN but I'm a little stuck on where to look next. Is it likely that the SMC has gone bad or am I missing something else (it's my first time with the original xbox motherboard)?
A visual inspection of the board reveals nothing that stands out of the blue and overall looks in fairly good condition aside from a light dust build up as expected.
When I press the power button the white LED comes on for a second before going off, and the light on the PSU is yellow, only goes white for a second when I plug it in and switch it on.
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