Dell Latitude E5440 Power Issue

[dspok]

Hello,

I have above said model with power issue. Power LED turns on for 5sec and off, battery LED blinking for 1sec continuously after power LED turns off. No power on B+ but all SCL SDA are 3.3v on battery connector.

3v, 5v is ok but I'm getting 13v on +PWR_SRC. I have changed charger IC no effect. No shorting and No leakage found. BIOS reprogramming may not help in this case in my opinion.

Can anybody help?

Thanks in advance.

[dspok]

Re: Dell Latitude E5440 Power Issue

anybody?

[khaahk]

Re: Dell Latitude E5440 Power Issue

Battery led blinking - is the battery connected or not?
Why do you rule out bios?
13V on PWR_SRC should be ok.
Which power rails come on when power button pressed?

[Duranitron]

Re: Dell Latitude E5440 Power Issue

Hello,

I have above said model with power issue. Power LED turns on for 5sec and off, battery LED blinking for 1sec continuously after power LED turns off. No power on B+ but all SCL SDA are 3.3v on battery connector.

3v, 5v is ok but I'm getting 13v on +PWR_SRC. I have changed charger IC no effect. No shorting and No leakage found. BIOS reprogramming may not help in this case in my opinion.

Can anybody help?

Thanks in advance.

check these power table .. check the alw voltages.. those voltages must be present in order for it to turn on

[ktmmotocross]

Re: Dell Latitude E5440 Power Issue

that 13V is way low. it is ok for stepdown circuits but not for logic.

check why u have 13V. i have this problem when have one of first two mosfets blown but everything works. blown mosfet have bigger resistance wich pulls 19V down and mosfet was heating

and remove battery until u solve that low voltage

[piernov]

Re: Dell Latitude E5440 Power Issue

+PWR_SRC is battery charging rail (before current sensing resistor). 13V sounds ok there.

[ktmmotocross]

Re: Dell Latitude E5440 Power Issue

+PWR_SRC is battery charging rail (before current sensing resistor). 13V sounds ok there.

looks like, but it is main power rail for every stepdown circuit when u check schematic.

that charging circuit looks weird