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PP1V06_S2SW_DRAM - 0.001 in diode mode and 2.5 Ohm to ground
Removed J7740/1 and R770A to check if U7700 is shorted and it is not shorted.
Because PP1V06_S2SW_DRAM going to the RAM any safe suggestion how to find what is shorted?
Board got liquid damage around JT400, Q5240, CC337.
Found short on PP5V_S2, replaced UP700 and short gone.
Got 5V and 0.04A from charger and I can hear clicking sound on the board - transistor?
Cant locate precise the location of that sound.
Any idea?
No error in diagnostic mode (battery connected).
Tested with original used battery and same issue.
One thing which is not right and dont know if it will be related:
J3300/47 USBC_XA_D2R_P<2>in diode mode 0.004 and should be around 0.330
Client had repaired liquid damage in some other shop.
They replaced battery and on the board I can see liquid damage around:
UB600, J5260, QV300, UB300
When on battery there are random restarts with kernel panic.
"*** Panic Report ***
panic(cpu 0 caller 0xffffff801f342836): nvme...
Soldered wire with SE032/3 and 4.
No DFU mode with battery and charger. The same without battery and charger.
PP1V8_SLPS2R 1.8V
PP1V1_SLPS2R 1.1V
PP0V8_SLPS2R 0.79V
PP1V8_AWAKE 1.79V
PP3V3_AWAKE 3.23V
PPVDDCPUSRAM_AWAKE 0.79V
PP1V2_AWAKE 1.19V
PPVDDCPU_AWAKE 0.75V
"Try to enter DFU using SE032 pads."
no luck
"Did you test the board alone on the desk?"
yes, got 5V and 0.26A on charger and every a few seconds meter turns off and turn on (cycles).
U3900 and U6903 gets warm.
"Replaced that CD3217 and still got the same issue."
When battery is disconnected got 5V and 0.25A on charger on both ports.
With battery connected 5V and 0A on one port and no reaction on USB C volt meter on another port.
When battery is disconnected got 5V and 0.25A on charger on both ports.
With battery connected it turns on but on login screen trackpad/keyboard is not working.
Fan on high RPM and 5V and 0.0A on charger on one port.
Second USB C port got not reaction on USB C volt meter - it is linked with...
There was small liquid damage on UR660.
Replaced that and still no sound.
IC is getting hot under thermal camera.
Don't have access to know working board.
Values around UR660:
PPBUS_AON_SPKRAMP_ABC_ISNS 11.96V
PP3V8_AON 3.79V
PP1V8_AWAKE 1.79V
PP1V2_AWAKE 1.22V
CR668/1 3.48V
RR662/1 0V...
There was connection between C3717/2 and J3700/22 so it was strange why there is no any value when SSD is inserted.
Checked inside of J3700 and pin 22 was bented/damaged.
J3700 replaced and all works fine again.
Many thank for all help.
Found something wrong.
One of C3710-17 dont match.
With SSD inserted on working board got diode mode reading 0.380 and on clients board got OL.
My 820-00138 boardview is in fact 820-3662 model and that area looks different .
Will show on photo below where got wrong reading.
It looks like it...
R3740 is good
J3700/24 - the same values on known working board:
w/o SSD - 0.456V
w/ SSD - 0.386V
J3700/7 - the same values on known working board:
w/o SSD - 0.290V
w/ SSD - 0.290V
J3700/8 - the same values on known working board:
w/o SSD - 0.440V
w/ SSD - 0.387V
J3700/47 - the same values...