820-3787 Missing PM_SLP_S3_L

[supamodz]

Hey guys working on this 820-3787, did some troubleshooting and came to the conclusion that i'm not getting 3v3 s0. No short to ground but after checking further i see that it comes from PM_SLP_S3_L, it is 0v not enabling u8180 to open. I have 3v3 s5 on pin 5 as always i get confused with this pm_slp output signals is this bad U1100 or something else is stopping it from outputting this signal.

 

[aprendiz]

PPVRTC_G3 present?? PM_SLP_S5_Lpresent??

 

[supamodz]

PPVRTC_G3 present?? PM_SLP_S5_Lpresent??

PPVRTC_G3 is 3.327 PM_SLP_S5_L is 0V

 

[jgraffis]

PM_SLP_S4_L voltage present?
if not this would suggest another problem.

 

[dukefawks]

If SLP_S5 is not present then I ver much doubt S4 will be there.....

DSW_PWRGD, ADAPTER_EN? Are you using a REAL 85W charger? Green/orange light present?

 

[supamodz]

If SLP_S5 is not present then I ver much doubt S4 will be there.....

DSW_PWRGD, ADAPTER_EN? Are you using a REAL 85W charger? Green/orange light present?

DSW_PWRGD 3.4, ADAPTER_EN 3.404 Real 85w charger green and orange light present.

 

[dukefawks]

Any history on this board?

 

[supamodz]

Any history on this board?

Only history i know is that someone else tried to work on the board, but when it got into my hands it had a short on ppbus, I remember you told me that the cpu usually dies. The short was on U7320 i did not think the short would go away so i replaced the chip and it did ppbus is stable but those signals are still missing.

 

[dukefawks]

Uhm, why are we bothering with this, CPU is dead. Also how can U7320 cause a short on PPBUS? Only Q7320 could have done that and killed the CPU.

 

[supamodz]

Uhm, why are we bothering with this, CPU is dead. Also how can U7320 cause a short on PPBUS? Only Q7320 could have done that and killed the CPU.

Say no more when I removed the u7320 the short was gone but I get it it's a dead dog because it got zapped just thought it had a chance to survive when pbus came back. Mark as solved I waste no more time.