A1708 820-00840 charging issue

[twonk9098]

Re: A1708 820-00840 charging issue

pp3v3_s5 is also a stable 3.3v.
Thanks

[mon2]

Re: A1708 820-00840 charging issue

Post the voltage readings for:

PPVCCGT_S0G

PPVCCCPU_S0G

[twonk9098]

Re: A1708 820-00840 charging issue

pp3v3_s5 is at 3.3v stable

Thanks

[twonk9098]

Re: A1708 820-00840 charging issue

PPVCCGT_S0G is at 0v

PPVCCCPU_S0G is at 0v.

Thanks

[mon2]

Re: A1708 820-00840 charging issue

Voltage of PP5V_S4 ?

[twonk9098]

Re: A1708 820-00840 charging issue

PP5V_S4 is also stable at 5v.

Thanks

[mon2]

Re: A1708 820-00840 charging issue

Voltage reading of ALL_SYS_PWRGD ?

[twonk9098]

Re: A1708 820-00840 charging issue

ALL_SYS_PWRGD is stable at 3.21v

Thanks

[mon2]

Re: A1708 820-00840 charging issue

Remove all power. Meter in lowest resistance scale.

Measure the resistance to ground of PPVCCGT_S0G

[twonk9098]

Re: A1708 820-00840 charging issue

Resistance of PPVCCGT_S0G is 3.9 ohms.

Thanks

[mon2]

Re: A1708 820-00840 charging issue

Voltage of SMC_GT_VSENSE ?

Update:

Also voltage of CPUVR_VIN ? (see attached)

[twonk9098]

Re: A1708 820-00840 charging issue

SMC_GT_VSENSE is at 0v.

Really appreciate your help, thanks.

[mon2]

Re: A1708 820-00840 charging issue

Voltage of CPUVR_VIN ? (see above last post for location)

[twonk9098]

Re: A1708 820-00840 charging issue

CPUVR_VIN is at 13v

Thanks

[mon2]

Re: A1708 820-00840 charging issue

Voltage of PP3V3_S5G ?

[twonk9098]

Re: A1708 820-00840 charging issue

PP3V3_S5G is at 3.3v.

Thanks

[mon2]

Re: A1708 820-00840 charging issue

Voltage readings of:

PM_EN_CPUVCC_R ?

PM_EN_CPUVCC ?

[twonk9098]

Re: A1708 820-00840 charging issue

PM_EN_CPUVCC_R & PM_EN_CPUVCC ar at 3.2v
I measured both sides of R7148 for the measurements.

Thanks

[mon2]

Re: A1708 820-00840 charging issue

So U7100 is being told to enable the power rails for the CPU via PM_EN_CPUVCC_R yet the power rails for the CPU (PPVCCGT_S0G ) remain @ 0v.

The resistance to ground (3R9) for the CPU rails (PPVCCGT_S0G ) appear to be ok so the CPU is not shorted.

Post the voltage readings for:

CPU_VIDALERT_L
CPU_VIDSOUT
CPU_VIDSCLK
CPU_VCCST_PWRGD

See attached and confirm that the same voltage readings are present on each side of the series resistors. These are the I2C lines + ALERT# signal out of U7100.

[twonk9098]

Re: A1708 820-00840 charging issue

R7144
Pin 1 is 0.99v
Pin 2 is 0.99v

R7141 (No Stuff)
Pin 1 is 0.99v
Pin 2 is 0.1v

R7138
Pin 1 is 0.99v
Pin 2 is 0.99v

R7145
Pin 1 is 0.99v
Pin 2 is 0.99v

R7142
Pin 1 is 0.1v
Pin 2 is 0.1v

R7139
Pin 1 is 0.924v
Pin 2 is 0.924v

CPU_VIDALERT_L is at 0.1v
CPU_VIDSOUT is at 0.99v
CPU_VIDSCLK is at 0.99v

Thanks