Faulty Panel PC mobo

[hein123]

I have a Hasee Panel PC which has a dead motherboard (99% sure).

I couldn’t find spares on the internet and I know if I did it would cost an arm and a leg. I have an electronic background so I am attempting to fix it myself.
However I need some advice.

The board is getting power as I can measure voltages at a few transistors at the power input, however the problem seems to be that if I press the Power On button (which does work) the rest of the board does not power up (Fan does not start, etc). There is an IT8712t chip near the inputs of the Power Button Cable so I am not sure it this chip is maybe faulty.

Any advice would be apprciated

 

[daz]

Are you sure that your BIOS is working properly?

 

[hein123]

The mobo does not switch on, so I do not think the BIOS matters

 

[daz]

How about power switches, is there energy flow thought theme.

 

[BoBBYI986]

Hi it's most likely the SMBus controller (system management bus) generally deals with switchin on/off or could be the +5v standby wire (purple) on the power supply unit, which is used to turn the pc on when hitting the power switch or shorting the power switch pins on the motherboards control panel or wake on lan etc.

 

[hein123]

How would I check if it is the SMBus controller as the power switch is working, 5V is measured?

 

[BoBBYI986]

you can't. it's just a damaged controller on the motherboard intergrated into the southbridge chipset ICH. I presume once you hit the power switch it sends signal to the SMbus controller then to the +5v standby wire on the psu to start the system. then gpu bios kicks in, system bios, raid bios and so on also ACPI.

I dont think there is anything you can try but yet again i aint a electrical expert. at the end of the day looking like best option is to buy a new motherboard.