I have a problem with my Laptop Inspiron 5150. These are the symptoms:
Without a battery and with the power adapter plugged into the
laptop...pressing the power button causes nothing, only I can observe
the two outer most LEDs of three on the front edge of the laptop to
flash on for a split second every 7 second.
With battery power and power adapter plugged in, the laptop works using
battery and no charge the battery. It seems to be a DC/DC converter that
is on the motherboard.

I disassembled the computer and on the motherboard found out among other
resistances, capacitors and stifles 4 integrated circuit:
[1] LM393 (2x one is the nearest to the battery)
[2] LM358
[3] MLAS298
I measured integrated circuit placed nearest the battery and has AC
voltage adapter on Vcc. How to test that LM393 works properly ? the
battery has little bit less voltage than normal (when is full). Maybe is
there way to cheat the battery and connect directly from AC adapter ?
On priv I can sand the picture of motherboard.
battery pins :

|
|
| [MOTHERBOARD]
|
+-^^^^^^^^^---------------------------

1.3.....9
+-^^^^^^^^^-----------------+
| |||| || |
| |||| |+- GND |
| |||| +-- GND |
| |||+------ 1,1Kohm - GND |
| ||+------- 0,9Kohm - GND |
| |+-------- 14V |
| +--------- 14V |
| |
| [BATTERY] |
|___________________________|

Between 1 i 2 voltage = 0V

I am also facing the same problem, did you find any workaround to fix
the problem?.
Please let me know.

Regards,
Arul

On Nov 15, 5:45 pm, kyoq wrote:
I have a problem with my Laptop Inspiron 5150. These are the symptoms:
Without a battery and with the power adapter plugged into the
laptop...pressing the power button causes nothing, only I can observe
the two outer most LED's of three on the front edge of the laptop to
flash on for a split second every 7 second.
With battery power and power adapter plugged in, the laptop works using
battery and no charge the battery. It seems to be a DC/DC converter that
is on the motherboard.

I disassembled the computer and on the motherboard found out among other
resistances, capacitors and stifles 4 integrated circuit:
[1] LM393 (2x one is the nearest to the battery)
[2] LM358
[3] MLAS298
I measured integrated circuit placed nearest the battery and has AC
voltage adapter on Vcc. How to test that LM393 works properly ? the
battery has little bit less voltage than normal (when is full). Maybe is
there way to cheat the battery and connect directly from AC adapter ?
On priv I can sand the picture of motherboard.
battery pins :

|
|
| [MOTHERBOARD]
|
+-^^^^^^^^^---------------------------

1.3.....9
+-^^^^^^^^^-----------------+
| |||| || |
| |||| |+- GND |
| |||| +-- GND |
| |||+------ 1,1Kohm - GND |
| ||+------- 0,9Kohm - GND |
| |+-------- 14V |
| +--------- 14V |
| |
| [BATTERY] |
|___________________________|

Between 1 i 2 voltage = 0V