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820-00165-a 150ma draw

F

flopper

Member
I have 2 boards with same issue 820-00165-a and 820-3437-b.
They both are drawing 150ma from power supply.
I checked q8150 - only voltage that is present there is S0PGD_C and it is 3.285v
I replaced Q8159,R8153,R8156,R8154.
Measured all rest near by resistors for their values against schematic.
Replaced U1950 just in case.
Single voltage that is present on U1950 is Pin8 and it is 3.4v
i guess i am not in S0 state as i am missing 5v on J6000
PPBUS is 8.58v
Any ideas?
 
2informaticos

2informaticos

Administrator
Staff member
What about 3V3_S5/SUS?
Post PM_BATLOW_L, PM_PWRBTN_L, PM_RSMRST_L, PM_DSW_PWRGD, PCH_DSWVRMEN.
Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L.
 
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F

flopper

Member
3v3_SUS on C1204 is 0v
3v3_S5 on C8020 3.317v
PM_BATLOW_L 3.389v
PM_PWRBTN_L 3.389v
PM_RSMRST_L 0v
PM_DSW_PWRGD 3.400v
PCH_DSWVRMEN 3.221v
PM_PWRBTN_L goes from 3.388v to 0.347v
 
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2informaticos

2informaticos

Administrator
Staff member
Please open different thread for 3437 board.

Talking about 00165, post now U7501 voltages; pins 23, 12, 13, 22, 29, 21.
 
2informaticos

2informaticos

Administrator
Staff member
"PCH_CLK32K_RTCX1 0.437v"
This is RTC clock signal; can be properly checked with an o-scope.
However, actual DC voltage looks like oscillation is present.

Still missing PCH_INTRUDER_L and PCH_INTVRMEN signals...
 
F

flopper

Member
U8130
pin 1 3.3v
pin 2 0v
pin 3 2.66v
pin 4 3.293v
pin 5 0v
pin 6 0v

I tried to replace U8130, still same, voltages same, checked R8133 is correct value
 
2informaticos

2informaticos

Administrator
Staff member
Looks like bad PCH.

Heat it to 180-200 degrees, for 15-20s.
You may have luck and has only accumulated crap underneath.
 
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