P71EN0 REV. C no power on

[Pragmatiko]

if consider power sequence, i have +3VA +5VA +12VA, when press power on button i am unable to get +3.3VS_ON and +3,3 VA and +5VA go to 0V

any help?

[Francisco.s]

Re: P71EN0 REV. C no power on

if consider power sequence, i have +3VA +5VA +12VA, when press power on button i am unable to get +3.3VS_ON and +3,3 VA and +5VA go to 0V

any help?

Check CPU_CORE (pin 2 of L2 coil) for short-circuit (any value above 1 ohm is ok), also check other pwm coils for low resistance.
Could you check current consumption from 19 volts?
Are 19 volts stable when you press power button?
Post results.
Good luck.

[Pragmatiko]

Re: P71EN0 REV. C no power on

Hi,
Tomorrow i'll post results.

Thank you very much.

[Pragmatiko]

Re: P71EN0 REV. C no power on

Check CPU_CORE (pin 2 of L2 coil) for short-circuit (any value above 1 ohm is ok), also check other pwm coils for low resistance.
Could you check current consumption from 19 volts?
Are 19 volts stable when you press power button?
Post results.
Good luck.

suddenly worked but after some time i test it now defective again

[Pragmatiko]

Re: P71EN0 REV. C no power on

i am thinking about bad contact under CPU soket, what do you think?

[Pragmatiko]

Re: P71EN0 REV. C no power on

when turn on CPU_CORE is 0,7volt

[dj_ricoh]

Re: P71EN0 REV. C no power on

do the board a favor and make a cake
stick it in the oven

[infosquadsn]

Re: P71EN0 REV. C no power on

ICH is a master piece on the power sequence. Try to apply a moderate heat in the south bridge for approximately 30 seconds using a heat gun or a SMD rework station. If after the test the laptop works again.....reballing it.


sorry the poor english and good luck