Runs on battery only wont charge or run on ac power charger working on another laptop fine

So your saying the charger will charge the battery, as long as the laptop is off...But when it is charged, you remove the ac adapter, start up the laptop, running on battery power alone, then hook the ac adapter to it, and the laptop cuts off..???

problem in mother board power supply unit check any dry soldering

Jenni:

Your battery has died. You'll have to buy another one.

Try to change the cmos battery?

Is the AC Power adapter the original adapter of the laptop? If it is, try to drain the battery and charge it for 8-12 hours without using or opening the laptop just charge it. After charging, remove the power adapter as you open your laptop. Make this way a habbit of using and charging your laptop to make the charging and battery life last long.

Possible cuase:
1 AC adapter failure
2 Power jack failure

First replace it with another working charger, see if the problem gone. If not, there may be strong possibility that the power jack was broken.

Here below are some common symptoms of a bad charger.
-The laptop only runs when you keep the power cord in a certain direction.
- The laptop only runs on battery power.
- The laptop will not charge the battery.
- The laptop switches from AC power to battery power intermittently.
- The unit suddenly shuts off
- Sparks come out of the back of the laptop.

Reference: Dell Latitude D620 Charger

Laptops must have a good battery in order to operate. If you take a good laptop, and remove the battery but leave it plugged in to AC it will not run.. Go out and get a new battery and you should be fine.

1st remove Battery after few min insert battery and connect charger Then power on laptop.If not on check Power Mosfet or Power ic.

How long have you had the laptop as all batteries even rechargeable have a limited life span. Dell laptop batteries normally have a life span of 1 to 2 years, so you may need to buy a new one

Hello. There is a hardware failure with the laptop not the AC charger. AC chargers have some range of protections of their own. If the power requirements of the laptop are bigger then what the charger can handle, the charger will turn off. Also other parameters can bring the charger offline. In your case, you have a problem with a small chip, the battery charge controller unit, witch regulates the amount of current required to propperly charge the battery. When this thing fails, the charging requirements for the battery are reported rong and the AC charger is forced to give more power then necesary. This results in disconnection of the AC charger ( an internal fail safe of the AC charger) and the laptop to swich back to battery power. When the laptop is turned off, it can charge the battery because the power requirements are low, having all processor, main board, hard disk etc turned off. Therefore the AC charger can handle the load. However you will need to have it checked by a service center as it is a hardware fault. Both AC charger and laptop needs that check. The charge controll circuit needs to be replaced probably. It will be a somewhat expensive repair. Don't buy any other battery untill you have the laptop checked. For more aditional info please post back. PS. Sorry for my bad english, I am from Romania, it is pretty hard for me to explain tehnical stuff in english.