dell d420 power problem, Please help.

[nazrul145]

Hi there, i have problem with dell latitude d420 with no power. TPS51120 vreg3 and VREG5 ok. But PL6 and PL7 Have not any voltage. i checked TPS51120 Pin29 EN1 and Pin 12 EN2 is 0v. Also SIO not release Aux_en and Sus_on voltage to enable 51120. I have change sio and reflash bios but sio not release aux_en voltage. Now i want help which pin voltage is input of sio for find those voltage.
PN: La-3071p
Please help to find this problem.

[ktmmotocross]

Re: dell d420 power problem, Please help.

what about ALWON signal?

[spidey]

Re: dell d420 power problem, Please help.

Check EC power (3.3v)present and ACIN, LID_SW is 3.3v

[nazrul145]

Re: dell d420 power problem, Please help.

thanks for help.
ec power 3.3v ok, alw_on 3.3v ok. Max 8731 ACIN 2.2v, Which pin is lid_sw? i cant identify this point.

[spidey]

Re: dell d420 power problem, Please help.

It is very old system and looks like it has 2 separate SIO that have different functions. On page 46, EMC5004 which has the power functions and if i'm not mistaken ACIN is ACAV_IN, lid_sw is LID_CL_SIO#. Check that pins, i hope it helps. Good luck..

[nazrul145]

Re: dell d420 power problem, Please help.

Thanks for reply, but ACAV_IN and LID_CL_SIO also 3.3v.