Dell 4010 UM8 gets off immediately problem solved..
Posted: Tue Dec 06, 2016 10:11 am
Today received dell 4010 with the problem on display Ok and immediately off generally assumed "ME" issue but during the diagnosis found the signal " power_sw" signal was bit low.
started with acav_in found ok. 3vdc high.
but looks a logic of D2 and D3 conducting according to logic, low this signal as Q5 Ntype got ON because of acav_in and D2 anode side ever kept low.
D2 diode must not conduct in this condition found its conducting, removed this diode and power_sw become normal again put good diode there and laptop start functioning pro
started with acav_in found ok. 3vdc high.
but looks a logic of D2 and D3 conducting according to logic, low this signal as Q5 Ntype got ON because of acav_in and D2 anode side ever kept low.
D2 diode must not conduct in this condition found its conducting, removed this diode and power_sw become normal again put good diode there and laptop start functioning pro