Greetings colleagues,
I rarely repair laptops now, but here came an Asus G512LI that really pissed me off.
Motherboard code G512LI Rev 2.0
Namely, it only needed to replace cooler fans, I found them on Aliexpress, ordered them and they arrived. Replaced it, but when I tried to turn on the laptop, it wouldn't turn on!?
I didn't try it before changing the fans, and the user told me that the laptop was in working order before, shit.
First I checked the charger, it only gave a couple of volts measured with a multimeter on the connector. When I moved the charger cable, it got 20V.
However, the laptop still wouldn't turn on after trying new charger. I soon realized that the problem was also in the motherboard.
The power supply chip PU8701 SN51285A overheated, it did not give 3V/5V or other voltages.
With the help of the schematic I found that I have low resistances on pin 3 of this chip, that's for the +3VA power branch. Through the laboratory power supply, I determined that the U3001 IT5125VG chip, the EC controller, was heating up. I removed EC, but that wasn't the end. Furthermore, I found that the PU9801 UP9026Q chip also overheats, when I removed it too, the low resistance on the +3VA branch was lost.
I don't know what caused all these to crash, except that the original charger was faulty. I believe that I could not have made such a failure on the motherboard by hand.
The mandatory question I am asking for , concerns the EC controller IT5125VG. Does it have firmware in it and will it need to be programmed when I order empty one from Aliexpress?
Thank you for your attention and thank you in advance for your reply.
Best Regards,
Mladen
I rarely repair laptops now, but here came an Asus G512LI that really pissed me off.
Motherboard code G512LI Rev 2.0
Namely, it only needed to replace cooler fans, I found them on Aliexpress, ordered them and they arrived. Replaced it, but when I tried to turn on the laptop, it wouldn't turn on!?
I didn't try it before changing the fans, and the user told me that the laptop was in working order before, shit.
First I checked the charger, it only gave a couple of volts measured with a multimeter on the connector. When I moved the charger cable, it got 20V.
However, the laptop still wouldn't turn on after trying new charger. I soon realized that the problem was also in the motherboard.
The power supply chip PU8701 SN51285A overheated, it did not give 3V/5V or other voltages.
With the help of the schematic I found that I have low resistances on pin 3 of this chip, that's for the +3VA power branch. Through the laboratory power supply, I determined that the U3001 IT5125VG chip, the EC controller, was heating up. I removed EC, but that wasn't the end. Furthermore, I found that the PU9801 UP9026Q chip also overheats, when I removed it too, the low resistance on the +3VA branch was lost.
I don't know what caused all these to crash, except that the original charger was faulty. I believe that I could not have made such a failure on the motherboard by hand.
The mandatory question I am asking for , concerns the EC controller IT5125VG. Does it have firmware in it and will it need to be programmed when I order empty one from Aliexpress?
Thank you for your attention and thank you in advance for your reply.
Best Regards,
Mladen
