Dell Latitude E5440 "no power", flashing Power led continuously [long blinks]

[classicandy]

Hello Everyone,
I have a Dell Latitude E5440 that doesn't power On. It flashes Power Led continuously [Long blinks].

Initial problem of this laptop was that the RAM IC [TPS51362] got burnt and caused a short on the motherboard. After replacing the IC, the short was gone but the Laptop did not power On. Instead, it starts blinking (long blinks) Power led continuously when I connect the AC adapter or Battery.

According to Dell's blink codes, it is assumed to be "Memory failed to initialize or Memory is unsupported"

check the attached image.

Any ideas on what i should do???

[Techtiger]

Re: Dell Latitude E5440 "no power", flashing Power led continuously [long blinks]

Is your 3/5ALWS & LDO voltages are ok ? RTC section Ok? What are the missing Voltages on the MB when Press the power button?

[classicandy]

Re: Dell Latitude E5440 "no power", flashing Power led continuously [long blinks]

Is your 3/5ALWS & LDO voltages are ok ? RTC section Ok? What are the missing Voltages on the MB when Press the power button?

3/5ALWS & LDO is present.

PL52 = 3.35v
PL53 = 5.18v
PL150 = 1.05v (just for a second)
PL300 = 1.4v (just for a second)
PL301 = 13.6v (+PWR_SRC)
PL401 = 13.7v
PL100 = 1.26v (just for a second)
RTC = 3.12v
PS_ID = 3.12v

[classicandy]

Re: Dell Latitude E5440 "no power", flashing Power led continuously [long blinks]

Hello Everyone,
I have a Dell Latitude E5440 that doesn't power On. It flashes Power Led continuously [Long blinks].

Initial problem of this laptop was that the RAM IC [TPS51362] got burnt and caused a short on the motherboard. After replacing the IC, the short was gone but the Laptop did not power On. Instead, it starts blinking (long blinks) Power led continuously when I connect the AC adapter or Battery.

According to Dell's blink codes, it is assumed to be "Memory failed to initialize or Memory is unsupported"

check the attached image.

Any ideas on what i should do???

Correction to this, TPS51362 is not the RAM IC, it is the +1.05V IC

[Techtiger]

Re: Dell Latitude E5440 "no power", flashing Power led continuously [long blinks]

3/5ALWS & LDO is present.

PL52 = 3.35v
PL53 = 5.18v
PL150 = 1.05v (just for a second)
PL300 = 1.4v (just for a second)
PL301 = 13.6v (+PWR_SRC)
PL401 = 13.7v
PL100 = 1.26v (just for a second)
RTC = 3.12v
PS_ID = 3.12v

+VDDRP & VGA CORE are missing ? U45 U46 pin 14 8 what is out put voltage ?

[classicandy]

Re: Dell Latitude E5440 "no power", flashing Power led continuously [long blinks]

+VDDRP & VGA CORE are missing ? U45 U46 pin 14 8 what is out put voltage ?

U46
Pin 14 = gets up to 3v and drops
Pin 8 = gets up to 3v and drops

U45
Pin 14 = gets up to 3v and drops
Pin 8 = gets up to 3v and drops.

The flashing power led is more like a Power On loop. Goes On-Off On-Off continuously......

[Techtiger]

Re: Dell Latitude E5440 "no power", flashing Power led continuously [long blinks]

flash Bios back up the Old bump, try and reset Bios battery