acer one d270 problem

[String2016]

I have a acer one d270 , the problem is if i used bench lap supply the laptop works fine, but when i used a charger laptop cannot turn on.I already tried good chargers and original charger but still same issue. does anyone encounter this please help

[Techtiger]

Re: acer one d270 problem

test with the original charger ISL88731C pin 2 13 22

[String2016]

Re: acer one d270 problem

original charger plugged in pin2=0v pin13=6.25v pin 22= 4.9v

[Techtiger]

Re: acer one d270 problem

ACIN Pin 2 AC Adapter Detection Input. Range zero to 5.5V.
ACOK AC Detect Output. This open drain output is high impedance when ACIN is greater than 3.2V. The ACOK output remains low when the ISL88731C is powered down.Range 3.3V to 5.5V.

Find out if the Fet PQ38 Drain Voltage with the Original Adapter what is the Voltage on same pins with the Bench lab supply

[String2016]

Re: acer one d270 problem

ok i tested PQ38 with bench lab and original charger both pin1-3 have 1-3 have 19v pin4=9.5v both pin 5-9 have 19v , but the weird problem is the laptop turns on if bench lab uses but with the original charger cannot turn on

[Techtiger]

Re: acer one d270 problem

Check the voltage with the Bench Lab ISL88731C pin 2 13 22 , do you have another original charger to test

[String2016]

Re: acer one d270 problem

the diferrence on ISL88731C same on pin2 and pin 13 but different on pin22 on original charger 4.9 with bench lab plugged in pin22 is 10v.i already tried 3 original charger

[String2016]

Re: acer one d270 problem

anyone can help on this please

[mcplslg123]

Re: acer one d270 problem

pin64 of kbc-measure voltage with original adapter and bench psu.

[String2016]

Re: acer one d270 problem

with original charger kbc pin 64 0v with bench lab 3.3v

[mcplslg123]

Re: acer one d270 problem

As you know acin should be 3.3V. You need to probe resistors connected with pin 2 and pin13 of charging IC. maybe one of them is bad.

PS: I'm assuming your mb is quanta ZE7 as you have not mentioned the exact platform.

[String2016]

Re: acer one d270 problem

yes motherboard is ze7

[String2016]

Re: acer one d270 problem

in the pin13 on the charging ic it has two resistors connected

[String2016]

Re: acer one d270 problem

@mcplslg123 thank you very much for the advise, i trace the resistor connected to pin 2 and pin 13 of the charging ic one is bad no ohms value, replaced it now its working fine with original charger , thank you

[mcplslg123]

Re: acer one d270 problem

@mcplslg123 thank you very much for the advise, i trace the resistor connected to pin 2 and pin 13 of the charging ic one is bad no ohms value, replaced it now its working fine with original charger , thank you

Great happy to help you.