Hi, I am working on a HP Pavilion G6 laptop with R13 motherboard and Intel I5 second generation processor + discrete GPU.
Initial problem was no boot and no poweron led..
Found that +12VALW generated by PU2 was shorted to ground by PC67.
Removed capacitor and power on led turned on. Also noticed that the area around 2nd mosfet PQ52 was light brown and actually the mosfet was shorted
Replaced mosfet. Laptopo turns on and boots windows fine. reinstalled Windows and updated bios to last version.
Unfortunately found that there is a problem with battery charging: led turns orange regularly but battery voltage remains the same. Checked different batteries and power supplies (working on a similar G62 laptop). Windows CPU ID utility correctly shows battery voltages, statistics and wear level ( so connection with the battery seems to be working), but no charging occours.
Charging IC is PU9 OZ8681 (qfn 16 but I could not find any datasheet).
Here are the voltages of the most relevant pins :
pin 1 - VAC =19V
pin 9 - ACIN = 3,3V (when charger connected)
pin 12 - BST = 16,91V
pin 13 - HDR =11,28V
pin 14 - LX = 11,28V (the battery voltage)
pin 15 - VDDP = 5,8V
pin 16 - LDR = 0V
Tested resistance on the 2 feedback lines (between pin 2 and 3, and between 4 and 5 = around 20ohms each which sounds good to me
Voltages on the battery connectors:
1 - B+ =11,28V
2 - B+ =11,28V
3 -SMD =3,3V
4 - SMC = 3,3V
5- not connected
6 BTEMP_MBAT = 1,69V
7 and 8 GND
Replaced PU9, PQ30, PQ29 (battery charger chip and the 2 driving mosfet which tested good). Replaced also PQ35 but problem remains.
Who tells the charging chip to start charging and how (EC CHIP?)?
Any help or suggestion is highly appreciated. Thanks
Initial problem was no boot and no poweron led..
Found that +12VALW generated by PU2 was shorted to ground by PC67.
Removed capacitor and power on led turned on. Also noticed that the area around 2nd mosfet PQ52 was light brown and actually the mosfet was shorted
Replaced mosfet. Laptopo turns on and boots windows fine. reinstalled Windows and updated bios to last version.
Unfortunately found that there is a problem with battery charging: led turns orange regularly but battery voltage remains the same. Checked different batteries and power supplies (working on a similar G62 laptop). Windows CPU ID utility correctly shows battery voltages, statistics and wear level ( so connection with the battery seems to be working), but no charging occours.
Charging IC is PU9 OZ8681 (qfn 16 but I could not find any datasheet).
Here are the voltages of the most relevant pins :
pin 1 - VAC =19V
pin 9 - ACIN = 3,3V (when charger connected)
pin 12 - BST = 16,91V
pin 13 - HDR =11,28V
pin 14 - LX = 11,28V (the battery voltage)
pin 15 - VDDP = 5,8V
pin 16 - LDR = 0V
Tested resistance on the 2 feedback lines (between pin 2 and 3, and between 4 and 5 = around 20ohms each which sounds good to me
Voltages on the battery connectors:
1 - B+ =11,28V
2 - B+ =11,28V
3 -SMD =3,3V
4 - SMC = 3,3V
5- not connected
6 BTEMP_MBAT = 1,69V
7 and 8 GND
Replaced PU9, PQ30, PQ29 (battery charger chip and the 2 driving mosfet which tested good). Replaced also PQ35 but problem remains.
Who tells the charging chip to start charging and how (EC CHIP?)?
Any help or suggestion is highly appreciated. Thanks
