asus k50ij dead

[koresi]

hello,
i have an asus k50ij with no led lights and no charging;there is only +19V and 3,3v for EC also EC_reset but no VSUS_ON.
I have checked the EC inputs everything seems to be ok...AC_IN_OC# is 3,3v...EC clock is 32 Khz..
I would change the EC but i want to be sure that EC is defective...
Any hint?
Could be the bios chip?I am not sure that the EC needs bios to rise up the VSUS_ON signal.
Waiting for your opinions...

Best regards.

[sopik78]

Try charger IC MB39A132 and related FETs

[Francisco.s]

Could you measure a high level at pin 19 (VSUS_ON) of IT8502?. (U3001)
If so, did this voltage gets to J8111 to reach VSUS_ON_PWR point?
(VSUS_ON--> VSUS_ON_PWR--> ENBL)
This mobo has JP8113 pads, to POWER TEST the pwm circuit of 3,3 and 5 volts.
Check and post results.

[whaldsz]

Originally Posted by koresi

hello,
i have an asus k50ij with no led lights and no charging;there is only +19V and 3,3v for EC also EC_reset but no VSUS_ON.
I have checked the EC inputs everything seems to be ok...AC_IN_OC# is 3,3v...EC clock is 32 Khz..
I would change the EC but i want to be sure that EC is defective...
Any hint?
Could be the bios chip?I am not sure that the EC needs bios to rise up the VSUS_ON signal.
Waiting for your opinions...

Best regards.

Check if you get 3.3v at RSMRST#.

[koresi]

Originally Posted by Francisco.s

Could you measure a high level at pin 19 (VSUS_ON) of IT8502?. (U3001)
If so, did this voltage gets to J8111 to reach VSUS_ON_PWR point?
(VSUS_ON--> VSUS_ON_PWR--> ENBL)
This mobo has JP8113 pads, to POWER TEST the pwm circuit of 3,3 and 5 volts.
Check and post results.

no,there is no voltage on pin 19 of IT8502.

[koresi]

Originally Posted by whaldsz

Check if you get 3.3v at RSMRST#.

i did not checked the RSMRST# signal,but i think it becomes active after VSUS_ON and SUSPWRGOOD.
I will check and tell you.
thanks.

[desktop85]

Originally Posted by Francisco.s

Could you measure a high level at pin 19 (VSUS_ON) of IT8502?. (U3001)
If so, did this voltage gets to J8111 to reach VSUS_ON_PWR point?
(VSUS_ON--> VSUS_ON_PWR--> ENBL)
This mobo has JP8113 pads, to POWER TEST the pwm circuit of 3,3 and 5 volts.
Check and post results.

I've the same board with the same problem, I solder the test pad JP81113 to power on the PWM U8101 ( RT8206AGQW ) but nothing happens, I've checked the power mosfets that the U8101 controls but are ok. Also I replace the PWM by other compatible ISL6236 but nothing.

I solder the test pad because I don't have the ENBL signal.