Asus GL503VD Not charging or powering on

[mon2]

Re: Asus GL503VD Not charging or powering on

Does your power supply support CC = constant current ?

[Jasonexe]

Re: Asus GL503VD Not charging or powering on

Does your power supply support CC = constant current ?

i think it does but i will send the link of the powersupply i got.
https://eleshop.eu/owon-spe3103-power-supply.html


Edit: Yes it does.

[Jasonexe]

Re: Asus GL503VD Not charging or powering on

Good news, i managed to repair my laptop. A SMD capacitor was causing the short, i replaced it and it’s all good now.

[Vesko356]

Re: Asus GL503VD Not charging or powering on

Good news, i managed to repair my laptop. A SMD capacitor was causing the short, i replaced it and it's all good now.

Bravo, you are lucky one, as I told you something is shorting the 19V power rail, a bad cap is the easiest case. Good job!

.

[Jasonexe]

Re: Asus GL503VD Not charging or powering on

Yes, i still noticed a problem. I can use the laptop with the charger but once i unplug it, my pc will turn off instantly. Windows is telling that my battery is 100%. I also tried measuring the voltage of the battery connector when the laptop is turned on and the voltage fluctuates between 0.6-0.8 volts. When i listen carefully i can hear a crackling sound close to the battery connector.

[mon2]

Re: Asus GL503VD Not charging or powering on

Remove the battery.

Meter in dc volts mode.

Measure the voltage to ground of each pin the battery connector on the logic board side.

The crackling sound may be contact arcing between the battery and mating connector contacts.

While the battery is removed, check the voltage on the battery without the laptop as a load. Is the battery charged?

See attached.

What is the voltage to ground of pin 15 (BATPRES#) without the battery connected?

What is the voltage to ground of this same pin, with the battery connected?

Remove the power adapter so that only the battery is powering the board.

What is the voltage to ground @ PL10 (point #1)?

What is the voltage to ground of

point # 2 (battery mosfet gate) and
point # 3 (battery mosfet drain pin cluster) ?

When the battery is present, pin #15 (active low signal) must be LOW (0v).

When the battery is absent, pin #15 should be pulled high by resistor PR531 and the voltage rail +3VPCU.

Respectively, when the battery only is present, the charger IC should enable the battery mosfet @ PQ23 to power the logic board.

Confirm this operation by checking the mosfet pins of PQ23.

When the adapter is connected, PQ23 should be OFF.

Confirm it.

[Vesko356]

Re: Asus GL503VD Not charging or powering on

First check again the PQ21 & PQ22 fets, if one or both are shorted again, this could be the reason.

.

[Jasonexe]

Re: Asus GL503VD Not charging or powering on

I have a problem, i desoldered the bios ic and reflashed it with a SPI programmer because I wanted to get rid of bios password. I didn’t use this laptop for a while so i forgot the password. I soldered the ic back and tested it and it was all good, i noticed that 1 pin was not fully soldered on to the board so i did the soldering process again. And after that my pc would not turn on, the weird thing is.. if i plug the charger in, the keyboard backlight would turn on by itself, but the led indicator doesn’t show that my laptop is powered on, even after pressing the power button. I desoldered the ic again after to check if nothing was shorted and I didn’t see anything wrong so i have no idea what’s going on.. it’s frustrating me. When i plug the charger in without the bios ic, i get the same thing, keyboard backlight turns on by itself.

[Jasonexe]

Re: Asus GL503VD Not charging or powering on

Hi, i managed to fix my laptop. I will check the things you asked me to do tomorrow and keep you posted.

[Jasonexe]

Re: Asus GL503VD Not charging or powering on

Remove the battery.

Meter in dc volts mode.

Measure the voltage to ground of each pin the battery connector on the logic board side.

The crackling sound may be contact arcing between the battery and mating connector contacts.

While the battery is removed, check the voltage on the battery without the laptop as a load. Is the battery charged?

See attached.

What is the voltage to ground of pin 15 (BATPRES#) without the battery connected?

What is the voltage to ground of this same pin, with the battery connected?

Remove the power adapter so that only the battery is powering the board.

What is the voltage to ground @ PL10 (point #1)?

What is the voltage to ground of

point # 2 (battery mosfet gate) and
point # 3 (battery mosfet drain pin cluster) ?

When the battery is present, pin #15 (active low signal) must be LOW (0v).

When the battery is absent, pin #15 should be pulled high by resistor PR531 and the voltage rail +3VPCU.

Respectively, when the battery only is present, the charger IC should enable the battery mosfet @ PQ23 to power the logic board.

Confirm this operation by checking the mosfet pins of PQ23.

When the adapter is connected, PQ23 should be OFF.

Confirm it.

I measured voltage from pin 15 and i get a voltage that fluctuates between 0-120 millivolts, same thing when battery is connected. I confirmed that the battery is dead, i tried recharging it with a adapter but after a couple hours it was still refusing to output any voltage.

[Jasonexe]

Re: Asus GL503VD Not charging or powering on

Edit: i decided to disassemble the battery pack (4 cells) and measured voltage from each cell and i get around 3.98v. When i measure from the battery connector i get nothing. So i think that a component on the pcb where the battery cells are connected is defective.

I also measured voltage from the battery connector on the motherboard with the battery removed.
pin 1, 2 and 3: voltage fluctuates between 2.61-3.80v
pin 4: voltage fluctuates between 3.18-3.20v
pin 5: voltage fluctuates between 3.18-3.25v
pin 6, 7 and 8: voltage fluctuaes between 0-2mv