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A1707 not powering on

H

hgoncalves

Active member
Hello,

We have an A1707 that stoped working with no reason. It has no liquid damages or anything else... just stop working. The client reporta the following:

"For some time now, the computer disconnected almost all usb-c connections with the message that ?The USB accessory is consuming too much energy. The ports were turned off ?, which I imagine may have something to do with this event."

Here are the measurements I got:

PPBUS_G3H = 12.58V
PPBUS_HS_CPU = 12.58V
PPBUS_HS_GPU = 12.58V
PPBUS_HS_OTH5V = 12.58V
PPBUS_HS_OTH3V3 = 12.58V
PPBUS_S4_HS_TPAD = 12.58V
PPVCC_S0_CPU = 0V
PPVCCSA_S0_CPU = 0V
PPVCCGT_S0_CPU = 0V
PPVCCIO_S0_CPU = 0V
PP3V3_G3H = 3.4V
PP3V0_G3H = 3.0V
PP1V2_S3 = 0V
PP1V2_S3_CPUDDR = 0V
PP1V2_S0SW = 0V
PP0V6_S0_DDRVTT = 0V
PP0V6_S3_MEM_VREFD0_A = 0V
PP0V6_S3_MEM_VREFCA_A = 0V
PP0V6_S3_MEM_VREFD0_B = 0V
PP1V8_SUS = Fluctuates between 1.4V and 0.5V
PP1V8_S4 = 0V
PP1V8_S3 = 0V
PP1V8_S3_MEM = 0V
PP1V8_S0 = 0V
PP1V0_SUS = Fluctuates between 0.6V and 0V
PP1V0_S3 = 0V
PP1V0_S0SW = 0V
PP3V3_S5_T139 = Fluctuates between 0V and 3.3V
PP3V3_S4_SOC_PMU = 0V
PP5V_S0_T139 = Fluctuates between 1V and 0.5V
PP3V3_S5 = Fluctuates between 0V and 3.3V
PP3V3_SUS = 0V
PP3V3_S4 = 0V
PP5_S4 = 0V
PP5V_S0 = 0.5V
PP3V3_S4_T151 = 0V
PP3V3_S0 = Fluctuates between 0V and 0.5V
PP5V_S5 = Fluctuates between 0V and 5V

The resistance of the PP3V3_SUS = 3M Ohm
The resistance of the PP5V_S4 = 5M Ohm

Can anyone help?
 
2informaticos

2informaticos

Administrator
Staff member
Welcome to the forum!

I don't see any reason for such a big listing.
If you miss a SUS voltage, no S4 possible; of course no S3 and S0 too.
In fact, even S5 is not stable in your case.

Let as know exact 820-xxxx board code...
 
2informaticos

2informaticos

Administrator
Staff member
Please, maintain forum aestethic.
Do not comment; always better to write new post.

Check for stable level at PP3V3_PMICLDO, PP1V25_PMICVREF, PP3V0_G3H and the 3 RTC signals (page 12).
 
H

hgoncalves

Active member
Hello, sorry for the aestethic. I?m new in the forums...

PP3V3_PMICLDO = 3.29V stable
PP1V25_PMICVREF = 1.24V Stable
PP3V0_G3H = 3V Stable

Related to the RTC Sgnals, I don't have an oscilloscope. Is there any other way to diagnose?
 
2informaticos

2informaticos

Administrator
Staff member
No need of an o-scope.
I was refering to 3 DC signals, RTC_RESET_L, PCH_SRTCRST_L, PCH_INTRUDER_L...
 
2informaticos

2informaticos

Administrator
Staff member
Trigger SMC_ONOFF_L and see if you catch higger peak value on the fluctuating signals and voltages.

Also try to start in SMC bypass mode.
 
H

hgoncalves

Active member
I?m not sure if I understood what you mean but in the SMC_ONOFF_L, mesured at the R4911 I?ve got a steady 3.4V.
Related to start in SMC bypass mode, I don't know how to do it. Can you please explain it to me?
 
H

hgoncalves

Active member
I guess that you're talking about what I know as smc reset (10 seconds on power off button). If so, I already did it.
 
2informaticos

2informaticos

Administrator
Staff member
"Trigger SMC_ONOFF_L"
As you have to work with board alone on the desk, use SW5200, or R5226 pads, instead of power button.
In fact, solder an wire on SMC_ONOFF_L and touch any metal plate (temporary contact), simulating power button.

"SMC bypass mode"
Put SMC_ONOFF_L to ground, connect charger, maintain contact 5-10s; board should start when you release SMC_ONOFF_L.

Remember to work with board alone, nothing connected apart of charger (no battery).
 
2informaticos

2informaticos

Administrator
Staff member
Trigger SMC_ONOFF_L repeatedly and check for reaction (pulse) at all PM_SLP_Sx_L; at same time as simulating power button.
First, be sure to get a drop pulse at PM_PWRBTN_L at same time.
 
2informaticos

2informaticos

Administrator
Staff member
Sorry, I forgot that 3V3_S5 fluctuates...
Remove R7663 and check if stable.
If yes, then check PM_PWRBTN_L reaction.
 
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