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820-00165 missing PM_SLP_S4_L

K

Kappy

Member
Hi.

I have a 820-00165 which had a burnt J3501.

s-l1600.jpg

This has now been removed. Not sure how this happened and why it burnt as no other components have been effected.

I've also remove the JTAG as this had a small amount of corrosion and I've replaced C3287, R3561, C3560 & U3560 just for giggles.

I'm missing PM_SLP_S4_L, some readings

PPBUS_G3H - 8v
PPVRTC_G3H - 3.4v
PP5V_S5 - 5v
PP3V3_S5 - 3.3v
PP3V3_SUS - 3.3v
PP1V05_SUS - 1v
PP5V_S4RS3 0v
RTC_RESET_L - 3.3v
PM_SLP_SUS_L - 3.3v

PM_PWRBTN_L - 3.4v
PM_RSMRST_L - 3.2v
PM_DSW_PWRGD - 3.4v
PCH_DSWVRMEN - 3.2v
PM_BATLOW_L - 3.3V

SMC_ONOFF_L triggered drops PM_PWRBTN_L to 0v

PM_SLP_S0_L pulse from 0v to 3.4v
PM_SLP_S3_L pulse from 0v to 3.4v
PM_SLP_S4_L pulse from 0v to 3.4v
PM_SLP_S5_L pulse from 0v to 3.4v
L7310 - pulse from 0v to 3.4v
L7320 - pulse from 0v to 3.4v

I'm also getting pulse on the U1950, pins 3,5 and 6

Not sure what else to check and why PM_SLP_S4_L is missing.
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
"PPBUS_G3H - 8v"
Please post EXACT volatge.
I doubt you have 8.00V there; and 8.2V will means something completely different than 8.4V!

"L7310 - pulse from 0v to 3.4v
L7320 - pulse from 0v to 3.4v"
Are you really sure???
VCORE cannot go up than 1.8V.
Please post accurate inbformation.

If you get pulse at pin 3/U1950, check if PLT_RESET_L pulse at same time.

If had corrosion around J6100, check all SPI Bus Series Termination resistors and their traces.
If all good, then try known good working BIOS.

Worth to try starting in SMC bypass first...
 
K

Kappy

Member
My bad.. I just cut and pasted the L7310/20 - it's pulsing 0v to 1.6v

PPBUS - 8.55v
PLT_RESET_L pulses 0v to 3.3v

U6100
pin 1 - 3.3v
pin 2 - 3.3v
pin 3 - 3.3v
pin 4 - 0.0v
pin 5 - 3.3v
pin 6 - 3.3v
pin 7 - 3.3v
pin 8 - 3.3v

No difference with SMC bypass - will try a working BIOS when I find one.

Any thing else I can check?
 
2informaticos

2informaticos

Administrator
Staff member
Do you note a drop pulse at pins 5/6 of U6100?
At same time when PLT_RESET_L pulses.
Don't forget to check mentioned resistors and traces...
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
"no other components have been effected."
U3560 is directly connected with PCH, it could be affected too...
 
K

Kappy

Member
Yes I've checked that with a working board and they are the same. (there was no liquid or burn near to it) I think I will have to put this down to a PCH fault as I don't know what to try next unless you have any suggestions..
 
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