820-4924 pp3v3_s0 1.7v

[PhilipC]

Liquid damage in U5400 area and above smc, replaced u5400 and u5600 as they had no legs
replaced R5499 and R5498

Green light to orange, pp5v are all good but the last 3v3 rail only measures 1.7v and no short to gnd on it.
Board is getting a little warm near the thunderbolt port area

 

[2informaticos]

Compare diode mode to ground with an working board.

Lot of components connected to PP3V3_S0_ISNS.
Some of them can be isolated, removing a resistor, or coil.

 

[PhilipC]

diode mode same for working board

 

[PhilipC]

replaced U8030 all working now

 

[2informaticos]

So the problem was in PP3V3_S0_FET line???
Next time, post accurate information...

 

[PhilipC]

it was with PP3v3_s0..., i traced it back and PP3v3_s0_fet is what becomes pp3v3_s0 no?

 

[2informaticos]

Take a look at page 68...

 

[PhilipC]

thats what I saw too but my brd doesnt have a ISNS rail, but fet is connected to 3v3_s0 through R5520 pin 1 and 2

 

[2informaticos]

So many 3V3_S0 lines there; I wasn't sure which one you've reffered.
I can only give a generic reply, in such case.
However, good to heard is solved now.

 

[PhilipC]

Thank you, I'll try be more descriptive next