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ronaldopdias started a topic Alienware M17 R3 - LA-J521P - CPU Fan not working.

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-27-2025, 04:12 AM
Alienware M17 R3 - LA-J521P - CPU Fan not working.

Hi.
I got this laptop with an overheating issue.
After opening, I found both fans clogged with dust and nicotine.
GPU Fan started to work after the disgusting cleaning, but the CPU Fan is dead. I ordered a new fan and replaced it, and it's still not working.
Further diagnostics show that the PWM signal from the EC Chip is OL.
Fan connector:
1 = +12V_FAN
2 = Open Line 0V This line comes from the EC chip. CPU_FAN_PWM
3 = +5VS - CPU_FAN_FB
4 = GND

I think because the fan was stuck for so long it damaged the line from the EC. The line...

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Last edited by SMDFlea; 03-27-2025, 06:25 AM. Reason: Link to Schematic & Boardview
ronaldopdias replied to 820-01700 - No power - 20V 0.8A

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-06-2025, 04:27 AM
The T2 that I replaced is from same lb model. But I just realize that the original T2 from the board I'm trying to fix is
h9hknnnBRumuvr-nlh and the donor T2 is
h9hknnn8Kumuvr-nlh.

Both board has 1TB storage.
Is this relevant?
Thanks....

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ronaldopdias replied to 820-01700 - No power - 20V 0.8A

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-06-2025, 03:21 AM
[LIST]

[B]LDO0[/B]: 0.195

[B]LDO1[/B]: 0.452

[B]LDO2[/B]: 0.528

[B]LDO3[/B]: 0.610

[B]LDO_RTC[/B]: 0.378

[B]VOUT_RTC[/B]: 0.391

[B]LDO_CORE: 0.376[/B]

[B]PP3V3_G3H_T [/B]@ L7660: 0.392[/LIST][LIST]

[B]LDO0[/B]: 0.195

[B]LDO1[/B]: 0.452

[B]LDO2[/B]: 0.528

[B]LDO3[/B]: 0.610

[B]LDO_RTC[/B]: 0.378

[B]VOUT_RTC[/B]: 0.391

[B]LDO_CORE: 0.376[/B]

[B]PP3V3_G3H_T [/B]@ L7660: 0.392[/LIST][LIST]

[B]LDO0[/B]: 0.195

[B]LDO1[/B]: 0.452

[B]LDO2[/B]: 0.528

[B]LDO3[/B]: 0.610

[B]LDO_RTC[/B]: 0.378

[B]VOUT_RTC[/B]: 0.391

[B]LDO_CORE: 0.376[/B]

[B]PP3V3_G3H_T [/B]@
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ronaldopdias replied to 820-01700 - No power - 20V 0.8A

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-05-2025, 01:08 AM
T2 replaced and the issue still there. Same symptoms....

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ronaldopdias replied to 820-01700 - No power - 20V 0.8A

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-04-2025, 05:59 AM
I replaced the NANDs, CD3217 all 4 and the U7000 and it still same issue.
Do you think by any change the problem would be on the PCH?
I could just replace, but I don't have the stencil for this.

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ronaldopdias replied to Asus UX534F Not charging.

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-01-2025, 09:09 AM
I tested the original battery again and it charges fine.
Any other Chinese battery the laptop refuses to charge.
Schematics are here:
[URL]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/96934-help-please-with-schematic-asus-ux534ft-rev-2-1[/URL]

All 3 Chinese battery are shown as 100% on the NLBA Laptop Battery Analyzer with EV2400 device.https://I tested the original batter...ses to charge.

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ronaldopdias started a topic Asus UX534F Not charging.

in Troubleshooting Laptops, Tablets, and Mobile Devices

03-01-2025, 03:23 AM
Asus UX534F Not charging.

Hi everyone.
I need some help, please.
This laptop turns on but doesn't charge the battery.
Works on battery and on charger.
No liquid.
Tested with 3 different batteries and same results.
It charges for 5 seconds after plugging the charger with charger drawing up to 60W (on the battery coil it measure 16.5V), but then charging light starts to blink orange and it drops to 8W (Battery coil 15.4V) and voltage on the battery coil drops to the battery voltage.
For now I just replaced the BQ chip, but the issue still there.
Appreciate any help....

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ronaldopdias started a topic 820-01700 - No power - 20V 0.8A

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-26-2025, 09:34 AM
820-01700 - No power - 20V 0.8A

Hi.
Got this Mac to repair which has no signs of liquid. No previous history.
Battery is dead, but I tested with a good working battery and still same.
PPBUS_G3 - 12.7V
PP3V3_G3H_RTC - 3.38V
PP1V8_SLPS2R - 1.8V Cycling.
T2 is glowing from one side and cycling.
SLPS2 and Awake is all cycling.[LIST][*][B]LDO0[/B]: 0.8V Cycling[*][B]LDO1[/B]: 3.0V Cycling[*][B]LDO2[/B]: 1.2V Cycling[*][B]LDO3[/B]: 1.8V ~ 1.78V[*][B]LDO_RTC[/B]: 1.5V Stable[*][B]VOUT_RTC[/B]: 3.3V ~ 2.69V[*][B]LDO_CORE: [/B]1.5V[/LIST]I've checked all the coils in diode mode and all seems...

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ronaldopdias replied to 820-00850 that is stuck on 5V at 0.294A

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-17-2025, 09:15 AM
U3200 replaced and fixed the problem
Battery is now charging and working fine.
Thanks for your help.

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ronaldopdias replied to 820-00850 that is stuck on 5V at 0.294A

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-15-2025, 10:59 AM
Do you know if CD3215C00Z is compatible with CD3215C00?

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ronaldopdias replied to 820-00850 that is stuck on 5V at 0.294A

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-15-2025, 10:15 AM
[B]CHGR_VDDA ; measure @ C7075 (pin 1) 5.10V[/B]
[B]CHGR_VDDP ; measure @ C7077 (pin 1) 5.10V

PP2V7_NAND_SSD0 2.52V
PP0V9_SSD0 0.90V
PP1V8_SSD0 1.80

PP3V3_G3S 3.38V
PP5V_G3S 5.14V[/B][B]CHGR_VDDA ; measure @ C7075 (pin 1) 5.10V[/B]
[B]CHGR_VDDP ; measure @ C7077 (pin 1) 5.10V

PP2V7_NAND_SSD0 2.52V
PP0V9_SSD0 0.90V
PP1V8_SSD0 1.80

PP3V3_G3S 3.38V
PP5V_G3S 5.14V[/B][B]CHGR_VDDA ; measure @ C7075 (pin 1) 5.10V[/B]
[B]CHGR_VDDP ; measure @ C7077 (pin 1) 5.10V

PP2V7_NAND_SSD0 2.52V

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ronaldopdias replied to 820-00850 that is stuck on 5V at 0.294A

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-15-2025, 09:52 AM
[B]CHGR_VDDA ; measure @ C7075 (pin 1) [/B]0.465
[B]CHGR_VDDP ; measure @ C7077 (pin 1)[/B] 0.465[B]CHGR_VDDA ; measure @ C7075 (pin 1) [/B]0.465
[B]CHGR_VDDP ; measure @ C7077 (pin 1)[/B] 0.465[B]CHGR_VDDA ; measure @ C7075 (pin 1) [/B]0.465
[B]CHGR_VDDP ; measure @ C7077 (pin 1)[/B] 0.465[B]CHGR_VDDA ; measure @ C7075 (pin 1) [/B]0.465
[B]CHGR_VDDP ; measure @ C7077 (pin 1)[/B] 0.465

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ronaldopdias replied to 820-00850 that is stuck on 5V at 0.294A

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-15-2025, 09:36 AM
All those options are OL
D2 is pin 2, but they are connected together pin 2 and 3.

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Last edited by ronaldopdias; 02-15-2025, 09:38 AM. Reason: ejfhwp
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ronaldopdias replied to 820-00850 that is stuck on 5V at 0.294A

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-15-2025, 09:13 AM
No resistence.
S2 / G2 - OL
S1 / G1 - OL

Diode measurement.
Q3200 pins:
1 - 0.660
2 - 0.650
4 - 0.650
5 - 0.192
8 - 0.566

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ronaldopdias replied to 820-00850 that is stuck on 5V at 0.294A

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-15-2025, 08:52 AM
G1 - 0V
G2 - 20V

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ronaldopdias replied to 820-00850 that is stuck on 5V at 0.294A

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-15-2025, 08:43 AM
The Q3200 gets 20V on pin 7 - [B]PP20V_USBC_XB_VBUS_F[/B].
20V is not present on the PPDCIN_G3H pin 8 when the charges is 20V.The Q3200 gets 20V on pin 7 - [B]PP20V_USBC_XB_VBUS_F[/B].
20V is not present on the PPDCIN_G3H pin 8 when the charges is 20V.The Q3200 gets 20V on pin 7 - [B]PP20V_USBC_XB_VBUS_F[/B].
20V is not present on the PPDCIN_G3H pin 8 when the charges is 20V.

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ronaldopdias started a topic 820-00850 that is stuck on 5V at 0.294A

in Troubleshooting Laptops, Tablets, and Mobile Devices

02-15-2025, 08:00 AM
820-00850 that is stuck on 5V at 0.294A

[B]Hi everyone. I need a help with this Mac, please.

T[/B]he logic board shows no signs of life , is clean with no liquid damage, and is stuck at 5V and 0.294A on all ports.
[B]DFU [/B]attempted, but it stalled halfway through the system installation.

[B]Mac turns on with a working battery, but doesn't charge it.
With a Working battery the voltages are 20V at 0.0300a[/B]

PPBUS_G3H - 12.28V
XB, XA, TA, TB are all measuring same voltage.

PP20V_USBC_XB_VBUS - 5V
PP3V3_UPC_XB_LDO - 3V
PP1V8_UPC_XB_LDOA - 1.8V
PP1V8_UPC_XB_LDOD...

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ronaldopdias replied to Acer Aspire 3 A314. Not Charging.

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-20-2024, 02:58 AM
You're a legend.
BQ24780S is the original IC and I was replacing with BQ24780.
I found the exact suffix with S and replaced.
Laptop is fully operational.
Thank you very much.

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ronaldopdias replied to Acer Aspire 3 A314. Not Charging.

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-19-2024, 10:02 AM
R1 - side 1 to the IC - 75ohms
- side 2 from adapter - 270ohms

R2 - side 1 - 76ohms
- side 2 to ground - 0ohms

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ronaldopdias replied to Acer Aspire 3 A314. Not Charging.

in Troubleshooting Laptops, Tablets, and Mobile Devices

12-19-2024, 09:28 AM
Yes, it receives 19V from the adapter, but the other side is 0V.

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Alienware M17 R3 - LA-J521P - CPU Fan not working.

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Asus UX534F Not charging.

820-01700 - No power - 20V 0.8A

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820-00850 that is stuck on 5V at 0.294A

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