Hello everyone!
I have a Dell Latitude E5440 on bench that is completely dead, no led, no other activity like there is no power adapter connected.
The power_jack_in has voltage 19,5V, the PL4 has 19,5 in both sides and the PQ 4 has 19,5 Voltages and gate the pin 4 has 9,37v.
Main power rail +PWR_SRC_AC had 19,5v in PL400 but on +PWR_SRC i have only 0,50v on pl401
no ldo only 0,5v Come on VIN (12pin) TPS51125 PU51
+PWR_SRC and +DC1_PWR_SRC voltage IS 0,5v or it must be 19,5v what wrong?
Any advice?
Thank you advance!
schematic:
https://drive.google.com/open?id=1Qh...QwMB5GlHZQ2bN6
I have a Dell Latitude E5440 on bench that is completely dead, no led, no other activity like there is no power adapter connected.
The power_jack_in has voltage 19,5V, the PL4 has 19,5 in both sides and the PQ 4 has 19,5 Voltages and gate the pin 4 has 9,37v.
Main power rail +PWR_SRC_AC had 19,5v in PL400 but on +PWR_SRC i have only 0,50v on pl401
no ldo only 0,5v Come on VIN (12pin) TPS51125 PU51
+PWR_SRC and +DC1_PWR_SRC voltage IS 0,5v or it must be 19,5v what wrong?
Any advice?
Thank you advance!
schematic:
https://drive.google.com/open?id=1Qh...QwMB5GlHZQ2bN6
Comment