Macbook Pro 15" 2010 820-2850A no power no green light Liquid damage

[ielectron]

Hi everyone,
I have mentioned in title laptop for repair.
Laptop starts working after cleaning there was a green light and fan spin and suddenly stoped giving any life.
My measure:
5V5_S5 present
3V3_S5 present
P3V42_G3H present 3.4V
PM_SLP_S4_L - 0V
P5VS3_ENTRIP - 0 V
PMSYSRST_L -0.00V
SMC_ADAPTER_EN - 3.42V
PP5V_S3 - 0V
I reflow SMC, I had a faulty Q7220. I replace it and also Q7225, U7201 but it didn't help.
I think the problem is PM_SLP_S4_L - 0V but can't find out why it is not there, rail is not shorted I check main rails they are not shorted.
Also I was checking for PP1V05_S5, U7740 is not fitted on main board by manufacture but is present on schematic diagram. where I should measure this voltage than couldn't find this rail.
Thanks for any help.

 

[2informaticos]

Post exact voltage for PPBUS_G3H.
Did you try another DCIN board?
Missing green light is a good point to start with.
Check SYS_ONEWIRE circuit.

"U7740 is not fitted on main board"
Read what appears in schematic (alternative option), to understand why is not there.
Who cares about it, if you get 1V05_S5...

Check all PCH's RTC signals too.

 

[ielectron]

Thanks for answers will check all mentioned signals, I have tested board with second DCIN board no changes.
Well I tried to find this voltage 1V05_S5 and its not on 1st pad of this U7740 place. Im not sure is not connected to this rail or its not present because I can't find place where it is generated or where else to measure it..

 

[ielectron]

I check schematic regrading to this 1V05_S5 voltage "Alternative is strong voltage dividers (200/100) to 3.3V S5"
Where this dividers can be find ?
Thanks

 

[2informaticos]

Don't bother with it yet.
PCH is not involved in SYS_ONEWIRE.

Try to reply us and we also try to help.
SMC_RESET_L is high?

 

[ielectron]

Have now some measurement:
SYS_ONEWIRE - 3.4V
PPBUS_G3H -12.58V
SMC_RESET_L -3.41V

Update: I measure also
SMC_TPAD_RST_L 3.40V
SMC_ONOFF_L 3.40V

Looks like the smc_reset signal should be low but is not from some reason

 

[JohnB8812]

With those measurements, you should have a green light and it likely could be turning on... Tried new DC-in board? FOR SURE using 85 watt mag 1 charger?

 

[2informaticos]

Post U6900 voltages.
Be sure to have continuity from its pin 5 to central pin of Magsafe connector.
Be aware, this board will NOT start with other charger than 85W; if battery is not connected.
PM_BATLOW_L low could mean incorrect charger.

"Looks like the smc_reset signal should be low"
Why do you expect that???