• Asus F541U MB X541UVK It turns on but does not send a signal

It is currently 26 June 2025, 20:22

Asus F541U MB X541UVK It turns on but does not send a signal

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#1 Asus F541U MB X541UVK It turns on but does not send a signal

by Zemog • 5 June 2025, 14:18
Hello everyone
I'm requesting your help troubleshooting this Asus F541U laptop with an X541UVK motherboard.

With the motherboard removed and nothing connected, when I connect the power, the battery charge LED lights up orange (without the battery present).

When I press the power button, the power LED lights up, but does nothing else. If it remains in this state, over time, the orange charge LED turns white, as if the battery were charged (even though it isn't).

I measured the resistances in the main coils and the voltages before and after pressing the power button, although the values ​​are the same in both cases:

PL 8702 ... 9 kΩ ... 5,1V
PL8701 ... 14 KΩ ... 3,3V
PL8600 ... 100Ω... 0V
PL9301 ... 21KΩ ... 0V
PL8101 ... 5Ω ... 0V
PL8102 ...5Ω... 0V
PL8302 ... 33Ω ... 1V
PL8901 .... +1MΩ ... 12,58V

On a few occasions, it's turned on and sent a signal, but then it's the same again.

Please, I need help.

.......................

Hola a tod@s
Solicito vuestra ayuda para encontrar la averría de este portátil Asus F541U con placa base X541UVK.

Con la placa base extraida y sin nada conectado, al conectar la alimentación, el led de carga de bateria se enciende en naranja (sin estar la batería presente)

Cuando pulso para el encendido, el led de power se enciende, pero no hace nada mas. Si se mantiene en ese estado, con el paso del tiempo, el led naranja de carga, pasa a color blanco como si la bateria estuviera cargada (aunque no está presente).

He medido las resistencias en las bobinas principales, y los voltajes, antes y depués de pulsar encendido, aunque los valores son los mismos en ambos casos:

PL 8702 ... 9 kΩ ... 5,1V
PL8701 ... 14 KΩ ... 3,3V
PL8600 ... 100Ω... 0V
PL9301 ... 21KΩ ... 0V
PL8101 ... 5Ω ... 0V
PL8102 ...5Ω... 0V
PL8302 ... 33Ω ... 1V
PL8901 .... +1MΩ ... 12,58V

En alguna ocasion puntual, ha encendido y mandado señal, pero después, otra vez igual

Por favor, necesto ayuda

Re: Asus F541U MB X541UVK It turns on but does not send a signal

by Google Adsense [BOT] • 5 June 2025, 14:18

#3 Re: Asus F541U MB X541UVK It turns on but does not send a signal

by carrneiro • 5 June 2025, 15:11
Check the resistance to ground on 8pin SPI flash ROM.

#4 Re: Asus F541U MB X541UVK It turns on but does not send a signal

by Zemog • 5 June 2025, 18:06
Machine wrote:Measure the voltages on pins 2, 5, 7, 8, 10, 12, 18, 20 of PU8600.


Pin 2, 5, 8, 10, 20 ..... 0V
Pin 7 ... 0,1V
Pin 12 ... 5,14V
Pin 18 ... 4,68V

carrneiro wrote:Check the resistance to ground on 8pin SPI flash ROM.


Pin 8 ... 32,5KΩ

#6 Re: Asus F541U MB X541UVK It turns on but does not send a signal

by Zemog • 6 June 2025, 11:58
Measure KBC:
Pin 12 ... 1,80V
Pin 14 ... 3,29V
Pin 26 ... 3,3V
Pin 57 ... 0V
Pin 66 ... 3,3V
Pin 67 ... 3,3V
Pin 85 ... 3,3V
Pin 86 ... 3,3V
Pin 96 ... 3,3V
Pin 111 ... 3,3V

At power off:
Pin 56 ... 3,3V
Pin 110 ... 3,3V

with power on pressed:
Pin 56 ... 0,55V
Pin 110... 0V

At power on:
Pin 56 ... 3,3V
Pin 110 ... 3,3V

#8 Re: Asus F541U MB X541UVK It turns on but does not send a signal

by Zemog • 19 June 2025, 13:13
Finally the equipment was returned to its owner

Thanks for the help as always

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