820 000165 ALL_SYS_PWRGD Missing

Board is taking 0.160 mA

ALL_SYS_PWRGD : 0.60 mA

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How would I know if its Q8150 or U1950?

I want to know how to approach this issue ? I don't want to use hit and trail method

I appreciate all your help Sir
 

2informaticos

Administrator
Staff member
"ALL_SYS_PWRGD : 0.60 mA"
This is nonsense; make difference between current and voltage!

Look at power on sequence and tell us which voltages do you get on the board.
To hunt ALL_SYS_PWRGD, you must get PM_SLP_S3_L first; it is pulled-up there.
 
My bad , it was Voltage not Ampere
ALL_SYS_PWRGD : 0.60 V

=================================
PM_SLP_S3_L Present

R8167
Pin 1 = 3.3V
Pin 2= 0.6 V
 

2informaticos

Administrator
Staff member
In such case, you should have voltage on some big coils.
Something pulls down ALL_SYS_PWRGD signal.
If one big coil has no voltage, its power good signal can be the reason.

Try first removing Q8150...
 
Removed Q8150

R8166 Pin 1 = 0.60V Pin 2 =0.60V
R8165 Pin 1 = 0.60V Pin 2 =0.60V
R8164 Pin 1= 0.60V Pin 2 = 0.60V
R8168 Pin 1= 0.28V Pin 2 = 0.60V


L7130 =8.6V
L7520 = 5.0V
L7560 = 3.3V
L7430 = 1.08V
L7630 = 1.05V
L7310 =0V
L7320 = 0V
 

2informaticos

Administrator
Staff member
Remove the resistors from ALL_SYS_PWRGD (one by one); check when the signal comes high.
Keep R8167 in place!
 
Removed
R8168 & Q8150

R8166 Pin 1 = 3.3 V Pin 2 = 3.3 0V
R8165 Pin 1 = 3.3 V Pin 2 = 3.3 0V
R8164 Pin 1 = 3.3 V Pin 2 = 3.3 0V

R8167 PIN 1 : 3.3 V & Pin 2= 3.3V
 

2informaticos

Administrator
Staff member
So you have a problem in U7400 area.
Should get 1.2V at R7450, not 1.08V.
Check the area for corrosion.
 
I cannot see any corrosion or anything physical near U7400. Should I start with disconnecting coil or replacing u7400? and Should I put Q8150 back to its place now?
 
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