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00165 Full Fan No Boot (Cold CPU)

R

Rford

New member
Have a 00165 that goes to full fan immediately upon plug-in (regardless of TP). Checked all rails are present except no VCORE. Noted some solder balls around C1031, but other than that the board looks absolutely fine. All 3.3 V present, all 5V present, all 1.8V present (except VCORE), all 1.2V Present.
Thoughts?
 
2informaticos

2informaticos

Administrator
Staff member
One power supply involved on ALL_SYS_PWRGD generation fails.
Can also be corrosion at U1950, or Q8150.
Check that area...
 
2informaticos

2informaticos

Administrator
Staff member
ALL_SYS_PWRGD is generated on page 59.
A bunch of resistors bring power good signals from several power supplies.
You can remove one by one, untill ALL_SYS_PWRGD goes high.
The last removed denotes the failing power supply.
You can start removing Q8150, which is not even necessary.
Be aware, do NOT remove R8167; is the pull-up resistor for ALL_SYS_PWRGD signal.
 
2informaticos

2informaticos

Administrator
Staff member
MLB will not work without that resistor, solder it.
And I told you to remove mentioned resistors one by one, not to check their values.
However, your issue should be missing R8167, do not tocuh anything else.
 
R

Rford

New member
I will attempt, however, it looks as if its a nostuff. it looks factory, not knocked off or removed.
 
R

Rford

New member
Sorry, I must've had a long day that day. R8162 is no stuff... Not 8167, 8167 is indeed there. I removed R8168, R8164, R8165, and R8166, one by one and ALL_SYS_PWRGD Did not change.
 
R

Rford

New member
Removed Q1850, All_Sys_pwrgd reading 3.3v now. Still no power to CPU. No PP1V05_S0. 1.7V at PPVCC_S0_CPU.
 
2informaticos

2informaticos

Administrator
Staff member
"No PP1V05_S0"
Check U7600/Q7630 power supply.

"Still no power to CPU
--------------------------
1.7V at PPVCC_S0_CPU"
Are you sure???
 
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