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820-3462 No S0 PM_SLP_S3_L is Low ( shorted?????)

Bouba148

Bouba148

New member
Small Water damage

PPBUS_G3H: 12.57V
PP3V42_G3H: 3.405V
PPVRTC_G3H: 3.343V

PP5V_S5: 5.053V
PP5V_SUS: 5.053V
PP3V3_S5: 3.343V

PP5V_S4: 5.054V
PP3V3_S4: 3.343V

PP5V_S3: 5.054V
PP3V3_S3: 3.346V

PP3V3_SUS: 3.342V

PP1V5R1V35_S3: 1.354V

No S0 State
No SMC Bypass mode

PM_SLP_S3_L: 2.327V
diode mode with red probe to gnd:
PM_SLP_S3_L: 0.088V shorted ????

Any suggestion before I'll pass it i the UC?
 
Bouba148

Bouba148

New member
After UC Cleaning Still the same situation:

PM_SLP_S3_L: 2.318V
diode mode with red probe to gnd:
PM_SLP_S3_L: 0.088V
 
2informaticos

2informaticos

Administrator
Staff member
088 is to low for that signal.
Check first R1924 for corrosion.
Test disconnecting RIO flex and also clean J4410.
Remove R7978 and test again; also remove U2800.
Finally remains PCH and SMC; put good flux and reflow them, if needed.
 
Bouba148

Bouba148

New member
PM_SLP_S3_R_L resistance to gnd: 2.8 Ohms
If R7978 is removed PM_SLP_S3_L mesures 3.4V

Tracked all PM_SLP_S3_R_L rails and removed and mesured all resistances (R7981 , R7985, R7986, R7987, R7988 ) to make sure no short to gnd
Then checked and removed all components after those rails that may be shorted to gnd: P5VS0_EN, P3V3S0_EN, PBUSVSENS_EN, TBT_S0_EN.

Regarding TBT_S0_EN it appeared that when I removed U9410, the resistance to gnd of PM_SLP_S3_R_L (pin 17@ U9410) mesured 45KOhms vs 2.8 Ohms and in diode mode with red probe to gnd PM_SLP_S3_L is 0.486V VS 0.088V before, which is a very good thing but when I've put the board under power I lost the PP5V_S5 rail.
Question: what is the relation between U9410 ( Thunderbolt ) and PP5V_S5 ( normally NONE).
Put back U9410 still no PP5V_S5
Tracked it back and find out that SMC_PM_G2_EN (P5VS5_EN ) is missing and R5098 is OK.
SMC_BATLOW_L: 0V

PP3V3_S5 : 3.297V
SMC_RESET_L : 3.372V
SMC_BC_ACOK: 3.371
SMC_ONOFF_L : 3.400V
SMC_BATLOW_L: 0V
I have 12Mhz at Y5010
At U2600:
PPVRTC_G3H: 3.402V
Pin 12: 32khz is OK
 
Last edited:
Bouba148

Bouba148

New member
BIG Sorry
PP3V3_S5 is 0V I was mesuring PP3V3_S5_AVREF_SMC because of OPENBOARD View pointing me at it......

which means NO S5 State at all
 
Bouba148

Bouba148

New member
I've reflowed the SMC and now Ihave the S5 state back :p
also with U9410 removed , PM_SLP_S3_L is 3.331V ;)
 
Bouba148

Bouba148

New member
replaced also R7978 because I've lost it.
Machine fixed: Fans spins
So the issue was U9410 "shorting" PM_SLP_S3_R_L rail to gnd.
Don't think I'll put a new U9400, I will leave it without it which means no thunderbolt port A
 
Bouba148

Bouba148

New member
I'm back with that board:
After I've put it back in the mbp, I had no bcklight ( fixed) and once ON it doesn't power OFF.
Tried to short the debug power pads ( R5015 R5016 ) still the same also with the keyboard connected I've pressed the power buton and mesured WS_KBD_ONOFF_L: this one passes from 3.397V to 0V which means the keyboard is OK.
I'm suspecting the SMC as if you read higher in the post I had to reflow it to recover the S5 state.
Any suggestion before I attempt a risky reflow again.
 
Bouba148

Bouba148

New member
Ola 2Informaticos,
I've reballed the SMC, and it's still the same situation like before:
Marchine turning ON, fans slowly runs to max speed, and no way to turn it OFF by shorting the power pads or from the keyboard.

So I've attempted a reflow again and the machine is acting the same except now I'm mesuring 0.367V VS 3.372V at the power pads (SMC_ONOFF_L) .

I think the SMC is bad........What do you think?
Is there's something else I can check?
 
Bouba148

Bouba148

New member
I did a Last reflow at 500°C and 120L/m and apparently it's working properly now : recovered 3,3v at smc_onoff_l and turning off when shorting power pads.
I left it on my desktop and will re assemble it later.
 
Bouba148

Bouba148

New member
re assemble everything and still the same problem, except that its reseting the SMC when shorting ( just a short contact not 5 sec ) the debupg power pads and not turning off.
When I press on the power botton of the keyboard it goes from 3.3V to 0.5V not less.
 
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