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820-00165-a orange led no power

T

tipoti

Member
hi

this motherboard was in contact with liquid
there was no green light when it first came , when it first arrived there was no green light at all. I changed the U7100,R7105,R7096 and the green light came on, then I inserted the battery and the device turned on.
then i collected the device and it won't turn on. It charges but the amperage drops backwards. first current 2.15 - 2.14- 2.10 - 2.05 -1.90 counting downward current starts to decrease now there is orange light but it does not turn on

PPBUS_G3H : 8.16 voltage
PP3V42_G3H : 3.4 Voltage
MC_BC_ACOK : 3.3Voltage

PP1V05_SUS: 1.0 voltage
SMC_RESET_L : 2.8 voltage
PCH_SRTCRST_L : 2.8 voltage
PCH_INTRUDER_L : 2.6Voltage

I don't know where to look now
 
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2informaticos

2informaticos

Administrator
Staff member
"PPBUS_G3H : 8.16 voltage"
Incorrect, if was measured without battery (charger alone); it should near 8.5V.

Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L (at same time).
 
T

tipoti

Member
SMC_ONOFF_L voltage drops to 0.41 when I press the 3.4 voltage power button. After connecting the battery and charger, the device should have turned on automatically.

8.40-45 voltage with battery installed
 
2informaticos

2informaticos

Administrator
Staff member
I asked voltage without battery.

If battery is already connected, board may not turn on automatically, when charger is connected...
 
T

tipoti

Member
It just opened again, now it won't open again.

PM_SLP_S4_L no response no voltage

PPVRTC_G3H: 2.8 voltage

PPBUS_S5_HS_OTHER_ISNS :8.53 Voltage

PP5V_S4RS3 : no voltage
 
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T

tipoti

Member
I heated the smc, it turned on, but the ssd is not detected. I did SMC reset, no boot sound.
ISNS_SSD_N 3.3 voltage
ISNS_SSD_L : 3.3 voltage

ISNS_P5VSSD_IOUT no voltage. u5480 has been changed, still the same. Should I reball the SMC, is the problem from smc?

PP3V3_S0SW_SSD_FLT : 3.3 voltage

tried different disk
 
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T

tipoti

Member
Disk Utility disk does not appear.
I tried with 2 different disks. I also felt that the large samsung chip on the ssd was a bit too hot.
 
T

tipoti

Member
pin 1 : 3.4 voltage
pin 2 : 0.99 voltage
pin 3 : 3.2 voltage
pin 4 : 3.4 Voltage
pin 5 : GND
pin 6 : 3.2 Voltage
pin 7 : No voltage
pin 8 : No voltage
 
2informaticos

2informaticos

Administrator
Staff member
If board turned on after heating SMC, there must be corrosion problems.
Reball SMC and test again.
May need to heat CPU also; possibly accumulated crap underneath.
 
T

tipoti

Member
I did smc reballing, same result. There is no liquid or damaged condition in the CPU region I don't think it's CPU/pch
 
2informaticos

2informaticos

Administrator
Staff member
Check J3700 traces and solders.
Compare voltage on its pins with good board; 1, 7, 8, 47, 48, 49, 50.
Also try changing U3710/11.

Be sure all C3710-17 are good, as traces too.
 
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