820-00165-A Orange Light, No Power

[Ripped_Pad]

Hey!

I'm new here but I have been trying to troubleshoot boards for a while. I have this board in that has an orange light but does not turn on, no fan spin. PPBUS_G3H is showing 8.56v on both sides of f7140. I found a cap that was askew [c7094] and replaced it. Before doing so, PP3V42_G3H was showing around 1.8V on pin 2 of L7095, now PP3V42_G3H is showing 3.335v on the same pin.

Not sure where to go from here, i could really use some help. Thank you!

As a side note, are there any resources someone can point me to to break down the sleep states for macbooks? Just trying to wrap my head around the logical progression from initial power to boot.

 

[2informaticos]

First of all, welcome to the forum!

Do you get 3v3_S5?
Check PM_BATLOW_L, PCH_DSWVRMEN, PM_DSW_PWRGD, SMC_ADAPTER_EN and PCH's RTC signals.

G3 to S3 State for Ivy Bridge Haswell and Broadwell - LogiWiki

We have Apple MacBook and iPhone Diode readings and general fault finding information compiled by the leaders in this area

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Be sure to use original Magsafe 2 charger.

 

[Ripped_Pad]

Thank you! Ill post them when i get back in my shop on tuesday. In the mean time, im off to study

 

[Ripped_Pad]

3v3_s5: 3.335v
PM_BATLOW_L: 3.309v
PCH_DSWVRMEN: 3.03v but drops to 2.8 temporarily
PM_DSW_PWRGD: 3.352v
SMC_ADAPTER_EN: 3.356v

PCH RTC: I may need some guidance on this, what signals do i need to check for? Im not sure if my meter is sufficient enough to measure clock signals, and since I have not measured clock signals before, I'm not sure if I'm doing it correctly (each probe on the terminals of the oscillator). In this case, am i checking PCH_CLK32K_RTCX1 against ground on my Hz setting on my meter?

I've got a Klein Tools MM400.

Thanks!

 

[2informaticos]

I meant DC voltage of RTC signals.
RTC clock isn't needed there (yet).

HOW TO collection

I hope this "How to" collection will help our members. I will possibly modify this post in time, if updates available. Trigger SMC_ONOFF_L (PMU_ONOFF_L): It reffers to simulate power button function, when the keyboard is not connected. We need to do this when we work with the board...

boards.rossmanngroup.com

Check if 3V3_SUS comes on too.

 

[Ripped_Pad]

RTC_RESET_L:3.24v
PCH_SRTCRST_L:3.27v
PCH_INTRUDER_L:2.06v
PCH_INTVRMEN:2.77v
3v3_SUS:3.33v

 

[2informaticos]

Trigger SMC_ONOFF_L and check for drop pulse at PM_PWRBTN_L (at same time).

 

[Ripped_Pad]

yes it does

 

[2informaticos]

PM_SLP_S4_L should pulse at same time; check that.
If catch it, check at ALL_SYS_PWRGD too.

Worth to try SMC bypass too...

 

[Ripped_Pad]

Will check / give that a try when I'm back in office. really appreciate your help

 

[Ripped_Pad]

PM_SLP_S4_L is at 0.0mv without power button
does that indicate short on that line?

Not sure if this is relevant, but r1461 shows 0.483v on pin 2 diode mode

not surprisingly, SMC bypass did not work, no ALL_SYS_PWRGD either

 

[2informaticos]

I asked if you catch any pulse at PM_SLP_S4_L when pressing power button (at same time).

 

[Ripped_Pad]

oh my bad, i thought it was brought to logic low like the other. No it does not change with power button

 

[2informaticos]

Then seems to have a PCH related issue.

"PCH_INTRUDER_L:2.06v"
Force this signal soldering 100K instead of 1M (R1301).

 

[Ripped_Pad]

PCH_INTRUDER_L: 3.1v
pulse on PM_PWRBTN_L and none on PM_SLP_S4_L still

 

[2informaticos]

Be sure 1V05_SUS is present.

You can try heating PCH area untill 200 degress Celsius, for 20-30s aprox.
No need to melt the balls; the idea is to burn eventually accumulated crap.
Use quality flux!

 

[Ripped_Pad]

1V05_SUS: 1.06v

Should I leave the underfill?

 

[2informaticos]

Is better to clean it, at least on the PCH's corners.

 

[Ripped_Pad]

No luck, anything else I should try?

 

[2informaticos]

PM_RSMRST_L stays always high?