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Hi Duke, I am curious. How are there pulses on PP5V_S3? Would they not get filtered by C7290, 91, 93? Would the pulse freq. be the 300KHz PWM freq? Thanks
Also inspect closely for corrosion, these boards rarely fail on their own. Measure voltages on C1802/3 as the trace can corrode too.
Is SMC_ADAPTER_EN present?
Thank you for replay louis. It's too late i blow smc away ? Waiting for a new one. Then i will try replace u2600.
See there is missing 2 trace under smc 1 is UC and second is GND_SMC_AVSS it is 3 off thes under smc and all off them goes to the same place so is this one important?