Dell Latitude E7440 power LED blink

[subroto]

Dell Latitude E7440 power LED blink after pressing power button, then power LED, hdd LED, wifi LED blink automaticaly and restarting again and randomly blink.
No display, fan is turned on during power led blinking.

Guys please help me.
Thanks in advance.
Here is the schematic:

[subroto]

Re: Dell Latitude E7440 power LED blink

Problem solved.

[bestdan50]

Re: Dell Latitude E7440 power LED blink

Problem solved.

how did you solved the Problem

[farooquepm]

Re: Dell Latitude E7440 power LED blink

how did you fix this problems

[subroto]

Re: Dell Latitude E7440 power LED blink

By flashing BIOS and replacing RTC battery.

[kingaarbi]

Re: Dell Latitude E7440 power off

when switch on after 20 sec turnd off..and battery led blink for 2,3 sec..
please advice.
thanks in advance

[SMDFlea]

Re: Dell Latitude E7440 power off

when switch on after 20 sec turnd off..and battery led blink for 2,3 sec..
please advice.
thanks in advance

Read post 4 and 5 . Replace the cmos battery first,if that doesn`t work flash the bios.

[kingaarbi]

Re: Dell Latitude E7440 power off

Read post 4 and 5 . Replace the cmos battery first,if that doesn`t work flash the bios.

i tried both options change cmos and flash bios but still same...

[kingaarbi]

Re: Dell Latitude E7440 power LED blink

there is no processor volts no ram volts and also no voltage on usb. please advice .

[SMDFlea]

Re: Dell Latitude E7440 power LED blink

have a look at PU100 ,check for +3.3V_ALWP and +5V_ALWP

[kingaarbi]

Re: Dell Latitude E7440 power LED blink

have a look at PU100 ,check for +3.3V_ALWP and +5V_ALWP

thanks alot for advice ... both voltages are ok..
any other thing

[SMDFlea]

Re: Dell Latitude E7440 power LED blink

Ok, check voltage on PU100 pin 3 ,U43 pin 14 +3.3V_ALW_PCH and PL701 pin 1

[kingaarbi]

Re: Dell Latitude E7440 power LED blink

Ok, check voltage on PU100 pin 3 ,U43 pin 14 +3.3V_ALW_PCH and PL701 pin 1

thanks again brother... these all voltages are ok..
but i noticed on u46 input 3 and 5 voltages ok but output voltages no have..

[SMDFlea]

Re: Dell Latitude E7440 power LED blink

U46 needs the RUN_ON signal from the KBC. Next check PU300 pin3 and 8

[AwaisMinhas]

Re: Dell Latitude E7440 power LED blink

I have dell 5440 with same fault kindly help me

[zaheer118]

Re: Dell Latitude E7440 power LED blink

U46 needs the RUN_ON signal from the KBC. Next check PU300 pin3 and 8

no voltage pin numbr 3 and pin 8

[nguyentuong3790]

Re: Dell Latitude E7440 power LED blink

Dell 5440 have source 19v q124 3v q126 but do not on the screen? thank!