ux31a2 zenbook no power

[Prosatanosz]

ux31a2 no power, except 19v. Nothing short, nothing hot. Any idea?

[on/off]

Re: ux31a2 zenbook no power

First schematic:

https://www.badcaps.net/forum/attach...9&d=1396645699

[Techtiger]

Re: ux31a2 zenbook no power

Supply on battery connector pin 12456
Supply on power BTWN
Bios pin 8

[Prosatanosz]

Re: ux31a2 zenbook no power

zero power anywhere. Battery zero, button zero, bios zero. No power at all, nor for seconds, witch supply should cames on first?

[Techtiger]

Re: ux31a2 zenbook no power

Test PQ8801 mosfet pin 1.2.3.4.5 Voltage
PQ8802 pin 1.2.3.4.5 Voltage
PJ8803 jumper Voltage?

[Prosatanosz]

Re: ux31a2 zenbook no power

Hi techtiger, PQ8801 not conducting. PQ8802 conducting. Shorting PQ8801 device work. Battery voltage 1V, seems not charging. BQ24725 fail, or battery fail? It is possible, only the battery fail? PQ8801 why not conducting, while PQ8802 conducting -> PQ8801 fail? If yes why not charge?

[Techtiger]

Re: ux31a2 zenbook no power

voltage in pin 12346 BQ24725 as for the PQ8801 is a Nchannel mosfet Gate should be high to by pass 22 to 25V pin 4 of BQ24725 is supplying it
test pc8805 PR8801 PC88012 with Voltage and out V mesure resiestence
test PQ8805 diode mode for short

[Prosatanosz]

Re: ux31a2 zenbook no power

Thx. PQ8801, PQ8802 one of them has G-S short. Other parts ok. Battery?

[Prosatanosz]

Re: ux31a2 zenbook no power

Battery is charging now, thx techtiger! I got a little scared of it

[Techtiger]

Re: ux31a2 zenbook no power

Glad to hear is the laptop working properly if so Merry Christmas