00165 Fan spin 10 seconds then nothing

[Rford]

Have a 00165 with 10 seconds of fan spin, then nothing... History liquid damage, burnt components @ PPDCIN area. Replaced components and ISL 6259. Have green light that turns orange. Any ideas what would cause the 10 second fan spin? its not 1/4 fan. BTW it didnt even do the 10 second spin until i replaced those components.

 

[supamodz]

Double check your logic board connector for loose pins or corrosion from the dcin board to your logic board and flex cable if that is good check your current sense resistors around u7000 and check your soldering for u7000.

 

[dukefawks]

DCIN board is not even needed and U7000 is fine. The usual corrosion points apply U1900/U1950/U6100 and termination resistors. My bet is on termination resistors from U6100 to SMC or the traces. I assume CPU Vcore is present during that 10 seconds.

 

[Rford]

DCIN board is not even needed and U7000 is fine. The usual corrosion points apply U1900/U1950/U6100 and termination resistors. My bet is on termination resistors from U6100 to SMC or the traces. I assume CPU Vcore is present during that 10 seconds.

So it doesnt even fan spin anymore.
Have PPUS G3H
PP3V42
No 5V or 3V rails

U7100
U7200
U7501
All new

Tried pls bro on this one... So tired of 00165's

 

[dukefawks]

No idea why you replaced all those chips if you had fan spin. Now it can be anything, when did fan spin stop? Checked for power cycling? 3V3_S5 still present? PPVRTC?

 

[Rford]

No idea why you replaced all those chips if you had fan spin. Now it can be anything, when did fan spin stop? Checked for power cycling? 3V3_S5 still present? PPVRTC?

10 seconds was probably an over estimation, more like 3-4 sec. I couldn't classify that as 1/4 fan spin though for obvious reasons.

3.3V on 3v3_s5
3.42 on PPCRTC...

where would I check for power cycling? It has a green light and switches to orange if thats what you mean.

 

[dukefawks]

I have no idea, if it is dead now after replacing all those chips for nothing then at least there is a problem there now. Pulsing will be on all rails, but first in line is 5V_S4.

 

[Rford]

DCIN board is not even needed and U7000 is fine. The usual corrosion points apply U1900/U1950/U6100 and termination resistors. My bet is on termination resistors from U6100 to SMC or the traces. I assume CPU Vcore is present during that 10 seconds.

Have another 00165 WITH THE SAME ISSUE! when you say termination resistors, do you mean around U6100? Like R6116. In an effort to become not so dumb, how would one know its a "termination" resister or a "pull up" resistor?

Side note, this one does actually run for 30 seconds before it shuts down.

VCORE is present
no corrosion around U1900 or U1950

 

[dukefawks]

It is not the same issue, it is the same symptom that can have 100 different causes. Yeah R6116 is on of the 16 termination resistors. Traces between them are also suspect.

 

[larossmann]

termination resistors are in line, pullup resistors are not.