Hp CQ62 SIO problem EC_USB_PWR_EN

[NConstantinou]

i have hp PM_A_HPC_S_MV_MB_V1 MOTHERBOARD.
the 3.3/5v voltage regulator is working.
i do not have the 5v on usb.
following the schematic i notice that from ITE8502 ,EC_USB_PWR_EN goes to usb chip APL3510 EN pin directly which suppost to be 3.3v, i get 0.05v and then goes to 0 and then back to 0.05v.

Can i give 3.3v from some other place instead of changing SIO ic!

Thanks

[SMDFlea]

Re: Hp CQ62 SIO problem EC_USB_PWR_EN

If the APL3510 is shorted why would you run 3.3V from somewhere else. Its an N channel mosfet, test it out of circuit

[NConstantinou]

Re: Hp CQ62 SIO problem EC_USB_PWR_EN

If the APL3510 is shorted why would you run 3.3V from somewhere else. Its an N channel mosfet, test it out of circuit

Thanks for your reply,

APL 3510 is not short. The voltage 3.3v is delivered from SIO pin 88 ec_udb_pwr_en to a resistor and then to pin 4 of alp3510.
As I mentioned when having the probe of multimeter on pin 4 I see that shows 0.05v,then 0v and back to 0.05v.
I tried resolve ite8502 but still the same result.
The power on lamp is blinking and laptop does not turn on.

[ktmmotocross]

Re: Hp CQ62 SIO problem EC_USB_PWR_EN

measure pin on KBC.voltage and resistance to ground

[NConstantinou]

Re: Hp CQ62 SIO problem EC_USB_PWR_EN

measure pin on KBC.voltage and resistance to ground

On keyboard connector pins 27,32 i get 0v.
resistance to ground 5.43K but i do not get any shorts

[ktmmotocross]

Re: Hp CQ62 SIO problem EC_USB_PWR_EN

keyboard connector?

KBC is SIO or EC

[lapfix]

Re: Hp CQ62 SIO problem EC_USB_PWR_EN

Did you got schematics ! post it.
what's the value of the resistor betwen pin 88 and pin 4 of alp3510 ! is it the same as the schematics !