• Asus Vivobook Pro 14X M7400Q it does nothing and there is no consumption

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Asus Vivobook Pro 14X M7400Q it does nothing and there is no consumption

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#1 Asus Vivobook Pro 14X M7400Q it does nothing and there is no consumption

by Zemog • 23 April 2025, 14:18
Hello
I have an Asus Vivobook Pro 14X M7400Q with an M3500QA R2.1 motherboard. When the power is connected, it does nothing and there is no power consumption.
I was able to get the boardview, but I couldn't find the schematic.

With the motherboard removed and nothing connected, I have a short on the following coils:
PL8702 (+3VSUS), PL8301 (+0.75VSUS), PL9201/PL9202/PL9203 (+NVVDD), PL8401 (+1.8VSUS), PL8105 (+VDDCR_SOC)

If I connect the power supply to A/D_DOCK_IN, I get 20V, and AC_BAT_SYS gets 8.35V.

I've opened the PL8702 coil (+3VSUS), injected voltage, and with 1.6V, the current draws 1.90A, but I don't detect excess heat in any component. The other coils are 0V.

Any suggestions?


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Re: Asus Vivobook Pro 14X M7400Q it does nothing and there is no consumption

by Google Adsense [BOT] • 23 April 2025, 14:18

#2 Re: Asus Vivobook Pro 14X M7400Q it does nothing and there is no consumption

by matic • 23 April 2025, 16:11
Hello!

Specify the resistances to ground on all coils.

#3 Re: Asus Vivobook Pro 14X M7400Q it does nothing and there is no consumption

by Zemog • 23 April 2025, 18:43
PL6001 (+V_DCJACK) ... 182 KΩ
PL8601 (+1,2V) ...185 Ω
PL8301 (+0.75VSUS) ... 0 Ω
PL9401 (+FBVDDQ) ...54 Ω
PL8702 (+3VSUS) ... 0,1 Ω
PL8701 (+5VSUS) ... 1,82 KΩ
PL8901 (P_CHG_LX1_30) ... 108 KΩ
PL9201, PL9202, PL9203 (+NVVDD) ... 0 Ω
PL8401 (+1.8VSUS) ... 0 Ω
PL8101, PL8102, PL8103, PL8104 (+VDDCR_VDD) ... 3,3 Ω
PL8105 (+VDDCR_SOC) ... 0 Ω

#4 Re: Asus Vivobook Pro 14X M7400Q it does nothing and there is no consumption

by whisperx • 23 April 2025, 21:17
You have shorts on multiple power rails (+3VSUS, +0.75VSUS, +NVVDD, +1.8VSUS, +VDDCR_SOC), which indicates a likely issue with a component common to these rails or multiple individual failures. The voltage injection on the +3VSUS rail shows a significant current draw without obvious heating, suggesting a low-resistance short that isn't generating enough heat to easily detect.

#6 Re: Asus Vivobook Pro 14X M7400Q it does nothing and there is no consumption

by Zemog • 24 April 2025, 13:00
whisperx wrote:Tiene cortocircuitos en varios rieles de alimentación (+3VSUS, +0.75VSUS, +NVVDD, +1.8VSUS, +VDDCR_SOC), lo que indica un posible problema con un componente común

That's what I thought, since it's not very common for so many lines to be shorted simultaneously.

Vogelek23 wrote:Su procesador está dañado.

It was one of the components that could be assumed

Finally, the equipment has been reassembled and returned to its owner.
Thank you very much for your help.

Re: Asus Vivobook Pro 14X M7400Q it does nothing and there is no consumption

by Google Adsense [BOT] • 24 April 2025, 13:00
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