820-00165 NO GREEN LIGHT NO FAN-PP3V3_S5 SHORT

yair37

Member
820-00165 very lite water damage at O/I and very lite at u7090...i was replace O/I and reball U7090.
no green light no fan pp3v3_s5 short.
ppbus_g3h - 8.2v
p3v42 - 3.4v
 

2informaticos

Administrator
Staff member
Not a pure short, but really bad value.
Possibly nothing heats if try voltage injection.
Lift one side L7560 and see where the low value remains.

Check for bad values on the other big coils.
 

yair37

Member
o.k fint the short now i have 3.3v on pp3v3_s5_AVREF_SMC but i have 0.02v on pp3v3_s5_REG_L
REPLACE l7560 and Q7560?
 

2informaticos

Administrator
Staff member
AVREF_SMC is not the same with 3V3_S5 from L7560.

Which is the ohm value, or diode mode to ground at L7560???
 

2informaticos

Administrator
Staff member
So you have 3.3V at L7560, or 0.02V?
Specify when you post voltage, or diode mode.
Or directly omit the "V" when you post diode mode!!!
 

2informaticos

Administrator
Staff member
Don't write ohm, if you measured in diode mode (nor volt also).
Just write .350 and will understand is diode mode; ohm value will be slightly different.

Post U7501 volatges; pins 23, 12, 13, 22, 29, 21.
 

yair37

Member
the board is back.....dead, green and orange light, NO fan spin NO bypass SMC.
PM_PWRBTN_L 1.1V, 0 then 1.1v when trigger SMC_ONOFF_L .
 
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