Weird Problem with Zenbook UX31la

[maxoscar]

Hello,

I have the below strange problem with Zenbook UX31LA :

-If the battery is connected, The laptop boot up using the battery mode regardless if the AC charger is being plugged in or off.

-The laptop could power up using the AC charger if the battery is disconnected,

The only way to let them both work together is to follow the below sequence :

1- Disconnecting the battery.
2-Booting up using the AC charger.
3-While the laptop is working, connecting the battery again (I know this is unsafe but this is the only way)

I have updated the BIOS , but the problem hasn't been solved.

Please Advice


Thanks in advance

[cacla]

Re: Weird Problem with Zenbook UX31la

You have problem with first or second mosfet form DC pin. Today i have the same problem.

[maxoscar]

Re: Weird Problem with Zenbook UX31la

Hello again and thanks for your answer

would you please help me how could I find the suitable mosfet (Number ) ?

[cacla]

Re: Weird Problem with Zenbook UX31la

First measure which one is faulty

[maxoscar]

Re: Weird Problem with Zenbook UX31la

Sorry for the dumb question as I am a newbie in this field, which is the better way to test the MOSFET:
- check if there is a shortage between the MOSFET's legs. Also between MOSFET's leg and the ground.
- while the laptop power on, check the input and output on the MOSFETS' leg 19v

are the above steps are the correct procedure, Thanks

[maxoscar]

Re: Weird Problem with Zenbook UX31la

Any idea?

[ktmmotocross]

Re: Weird Problem with Zenbook UX31la

every way is good. more measuring data, more u know for repair

[maxoscar]

Re: Weird Problem with Zenbook UX31la

You have problem with first or second mosfet form DC pin. Today i have the same problem.

Hello again

I have checked the mosfet today with multi-meter and there is a shortage in the mosfet between the drain and the source . How could I purchase a substitute item.

Thanks in advance

[maxoscar]

Re: Weird Problem with Zenbook UX31la

Any idea, please ?

[rtstorm]

Re: Weird Problem with Zenbook UX31la

Do you have a schematics? If yes then read value for that fet, or use a magifierband read the text from mosfet