Re: A1708 820-00840 charging issue
pp3v3_s5 is also a stable 3.3v.
Thanks
pp3v3_s5 is also a stable 3.3v.
Thanks
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Re: A1708 820-00840 charging issue
Post the voltage readings for:
PPVCCGT_S0G
PPVCCCPU_S0GComment
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Re: A1708 820-00840 charging issue
pp3v3_s5 is at 3.3v stable
ThanksComment
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Re: A1708 820-00840 charging issue
PPVCCGT_S0G is at 0v
PPVCCCPU_S0G is at 0v.
ThanksComment
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Re: A1708 820-00840 charging issue
Voltage of PP5V_S4 ?Comment
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Re: A1708 820-00840 charging issue
PP5V_S4 is also stable at 5v.
ThanksComment
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Re: A1708 820-00840 charging issue
Voltage reading of ALL_SYS_PWRGD ?Comment
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Re: A1708 820-00840 charging issue
ALL_SYS_PWRGD is stable at 3.21v
ThanksComment
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Re: A1708 820-00840 charging issue
Remove all power. Meter in lowest resistance scale.
Measure the resistance to ground of PPVCCGT_S0GComment
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Re: A1708 820-00840 charging issue
Resistance of PPVCCGT_S0G is 3.9 ohms.
ThanksComment
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Re: A1708 820-00840 charging issue
Voltage of SMC_GT_VSENSE ?
Update:
Also voltage of CPUVR_VIN ? (see attached)Attached FilesLast edited by mon2; 03-26-2022, 10:40 AM.Comment
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Re: A1708 820-00840 charging issue
SMC_GT_VSENSE is at 0v.
Really appreciate your help, thanks.Comment
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Re: A1708 820-00840 charging issue
Voltage of CPUVR_VIN ? (see above last post for location)Comment
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Re: A1708 820-00840 charging issue
CPUVR_VIN is at 13v
ThanksComment
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Re: A1708 820-00840 charging issue
Voltage of PP3V3_S5G ?Comment
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Re: A1708 820-00840 charging issue
PP3V3_S5G is at 3.3v.
ThanksComment
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Re: A1708 820-00840 charging issue
Voltage readings of:
PM_EN_CPUVCC_R ?
PM_EN_CPUVCC ?Comment
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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.
ThanksComment
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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.Attached FilesComment
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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
ThanksComment
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Hello everyone,
I'm experiencing an issue with my Alienware 15 R2 (Service Tag: DL7NN32). The laptop works perfectly when connected to the AC adapter — it powers on and functions normally. However, the battery does not charge. If I disconnect the DC adapter, the laptop shuts down immediately, as the battery is at 0%. I have replaced the battery with a new compatible one, but the issue persists. I also replaced the AC adapter with a compatible one, but the battery still doesn't charge.
To assist with troubleshooting, I'm attaching two power circuit schematics:- Power
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Hello. Sorry for the long post, but I am trying to decide if this is a simple battery replacement, or potentially something more complicated.
I bought an open box MacBook Air M1 2020 A2337. Seller claimed it was never used. Visually, it appears pristine.
On arrival, the battery was completely flat. Computer powers up and boots fine. Battery status showing 1% and charging, 1 cycle. coconutBattery showing 0 mAh and ~6 watts.
After some hours, the battery status did not improve. Restore via DFU did not help.
I connected the power adapter to a Kill-a-Watt... -
Have Dell la-j081p laptop with battery issue.
First the laptop was not charging pqb25 was short after changing pqb25 and pqb26 the laptop starts charging and runs properly on charger but battery it shutdown after 10 seconds.
And when powered on only on battery the laptop turns off after 8-10 second without giving display.have tried another battery on another working laptop and it's working fine
I have changed charging ic and pqb25 ,pqb26 and pqb13.
When adapter is disconnected the laptop stays on battery for 8-10 sec then abruptly shutdown everytime.
This is the link... -
Hello everyone,
I have a problem identifying a problem on this MacBook Air A1466 with board 820-00165.
A customer came in with a problem, the laptop was not charging. Otherwise, it works fine - runs from a battery without an issue. The battery is original, the customer also provided his original charger.
However, when I was diagnosing the issue, I turned the laptop off, checked the board, etc. When I put everything back together, the laptop was charging (I inserted the charger and then turned the laptop on). After unplugging the charger and plugging it back,... -
For Badcaps Readers, Please note that I am hopefully going to present this same message to Lenovo to see if they have any insight to the matter as well and figured to share the entirety here for clarification. The System is out of warranty as it is but does have the option to have it extended.
Model Information: T14 Gen 2 (Type 20XK, 20XL) Laptop (ThinkPad) - Type 20XK - Model 20XK0069US
Board: T14 Gen 2 (Type 20XK, 20XL) - Type 20XK.
System Hardware:
Processor: AMD Ryzen 7 PRO 5850U
Memory: 1x 16GB DDR4 3200 (Soldered on Board); 1x Crucial 32GB DDR4...09-08-2025, 10:46 PM
Comment