Hello to all,

I need help with Toshiba Satellite Pro L300 motherboard. Someone already tried to repair it and I think he moved some of the components around the standby controller. Here are the pictures of the board and standby controller zoomed in. If someone have the same board, please take a picture of it and post it.

Thank you!

Repair this capacitor.

I know about NEC Tolkin capacitors, I have exchanged them a milion times but it's not the problem here.

Standby controller is overheating, no voltages on chokes, something not right with standby voltages...
Motherboard won't turn on.

There are two possibilityes for "boiling" 51125 - 1) shorted load; 2) 51125 is dead. check load resistance on both chokes and on 8 and 17 pins.

I have no such mobo at home, but for me it does not look like something is missing around PWM. It will took you 10 minutes to compare with principial scheme of mobo which is available for free or typical application circuit of controller

I already exchanged the TPS51125 for a new one, and changed KBC with other one, the same problem exists. No one from my colleagues has this motherboard so I can't compare it.

please, could you tell us measured resistance values from pins 8, 17, 11, 20 to gnd, in case it isn't a military secret