820-00165 No PP5V_S4RS3, green light OK, no FAN spin.

[george-a]

Hi guys,

I started a new thread as the one similar to my problem is.. ehmmm similar which can lead to a messed up existing thread. So here is exactly what happens to mine:

It came with LD but almost impossible to notice. I did a UC but nothing changed.

1) Green -> Orange Light OK
2) 3V42, PPBUS, PPVRTC, 5V_S5, 3V3_S5, 3V3_SUS, PP1V05_SUS OK
3) SMC seems alive, various lines produce pulses, voltages are there, there is 32KHz clock going in, maybe I need to check something more specific?
4) SPI looks and feels good
5) P5VS4RS3_EN missing => PM_SLP_S4_L also missing

Also it does not start with C1300 & C1303 removed.

Thank you in advance,

g

 

[larossmann]

Are the probe points to the left/down from the SPI ROM looking clean? A break there is common since it is along the edge.

 

[larossmann]

Also the signal side of R1303, R1302, R1301, and R1300 never drop below 3v, right? I had one where PCH_INTVRMEN was 2.9v, just for the f of it i shorted one of the 3.3v ones next to it to PCH_INTVRMEN and it turned on and worked forever..

but this can be anything. PCH issue, corroded trace around BIOS, SMC keeping SMC_ADAPTER_EN & PM_BATLOW_L low,

Is PM_SLP_S4_L plain 0v dead, or jumping up and down?

 

[larossmann]

Look where that signal goes to on both sides and see if something is corroded further down.