820 2915 no green light

[Noguinfor]

Hey,

This one, no liquid and no signs of corrosion or components knock out!

I don't have green light!

PPBUS - 1.3V
PP3V4S_G3H -3.5V
SMC_BC_ACOK - 0V

resistance 27/28 : 21 ohm
resistance 17/18 : 3.4 ohm

already replace U7000 2 times same history.. The motherboard already turn on 2 times On! when it turn's on PPPBUS stay on 12.69V.. But after 1 min it goes down!

any idea?

thanks

 

[2informaticos]

First of all check SMC_RESET_L.
Post basic voltages of U7000; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.
Did you try known good DCIN board?

 

[Noguinfor]

First thing i did its try a new DC in!

while i was check the voltages i noticed that voltage on pin 2 was wrong. Common R7005 problem.

some times we look for the hard things and forget the basics!

Thank you Mr.while i was check the voltages i noticed that voltage on pin 2 was wrong.

Thank you Mr.Vali