The laptop power light flashing erratically and the battery charge light blinking on and off when AC adapter is plugged into the laptop.

Possible cause:

1. Power jack failure.
2. AC adapter failure.

Possible troubleshooting steps and repair solution:

If it happens only when you move the adapter plug inside the power jack, it’s likely that you have a problem with the power jack inside the laptop. The power jack has to be resoldered or replaced.

If it happens even without touching the adapter plug, the problem could be related to the faulty power adapter.

You can test the power adapter with a voltmeter and find out if the ouputed voltage is correct. If the voltage is not correct, replace the adapter.

But don’t trust that even if the output votage matches specifications. It’s possible that the power adapter doesnt’ work correctly under load. Test your laptop with another known good adapter. If the laptop works fine with another adapter, your power adapter is defective and has to be replaced.

The laptop shuts off when AC power adapter is plugged in. The laptop works fine on battery power but as soon as you connect it to AC adapter, the laptop turns off.

Possible cause:

1. Power adapter failure.
2. Motherboard failure.

Possible troubleshooting steps and repair solution:

First of all, test the power adpater. Make sure the apdapter outputs correct voltage. It’s possible that the outup voltage is not correct and the laptop shuts down to prevent the damge. Test your laptop with anohter known good power adapter.

If the problem still exists, even after replacing the adapter, most likley it’s the motherboard failure. Replace the motherboard.

The battery charges only when the laptop turned off. The battery charge LED lights up as normal and the battery gets charged to 100% while the laptop is off.
When the laptop is turned on, the battery charge LED goes off even if the adapter is still plugged in.

Possible cause:

1. AC power adapter failure.
2. Battery failure.
3. Broken/loose power jack.
4. Motherboard failure.

Possible troubleshooting steps and repair solution:

1. This problem could be related to a faulty AC power adapter. It’s possible that the AC adapter doesn’t provide enough power when plugged into the laptop. To find out if this is your problem, you’ll have to test the laptop with another working adapter.Replace the adapter if needed.

2. There is a slight chance that you have bad battery. Test the laptop with a know good battery and replace the faulty one if needed.

3. The battery charge problem could be related to the power jack. Maybe the jack is broken or not making good contact with the motherboard. It is necessary to remove the motherboard and take a closer look at the power jack. Resolder or replace the jack if needed.

4. If the power jack is in a good working shape and new power adapter with battery do not fix the problem, most likely you have a faulty motherboard. Replace the motherboard if needed.

The laptop power light doesn’t come on when AC adapter plugged into the laptop. The power light used to light up as soon as you plug the power adapter but no there is no light.

Possible cause:

1. AC adapter failure.
2. Power socket failure.
3. Motherboard failure.

Possible troubleshooting steps and repair solution:

1. Test the AC adapter with a voltmeter. Make sure the AC adapter outputs correct voltage. Alternatively, you can test the laptop with another known good adapter and see if it fixes the problem. Replace AC adapter if needed.

2. If the power socket inside the laptop was getting loose before the power light failure, it’s possible that you have a broken power socket. It is necessary to open up the laptop an take a closer look at the power socket a.k.a. DC power jack. Replace the power socket if needed.

3. This problem could be related to the motherboard failure. If the power socket and power adapter are in good working condition, but you still have no power light, most likely you have a failed motherboard.

The laptop AC adapter makes buzzing noise and gets very hot.

Possible cause:

AC adapter is failing.

Possible troubleshooting steps and repair solution:

All laptop adapters make some buzzing noise and generate some heat.
If you can hear the buzzing noise only when you listen very closely, that’s normal. If you can keep the adapter in your hands and it’s comfortably warm, it’s normal too.
On the other hand, if you can hear the buzzing noise from a few feet away, and the adapter is so hot that you can barely keep it in your hands, most likely the adapter is failing and will have to be replaced soon.

The AC adapter is a sealed unit and cannot be repaired. When adapter fails, you just replace it with a new one.

The laptop switches from AC power to battery power even when the AC adapter is still plugged into the laptop. The AC power light goes off but the laptop keeps running from the battery. If you adjust the position of the power plug inside the socket, the power switches back to AC.  The problem is intermittent. Intervals between the power failure may vary.

Possible cause:

1. AC power adapter failure.
2. DC power jack failure.

Possible troubleshooting steps and repair solution:

First of all, test the AC power adapter. It’s possible that the power cord on the AC adapter is damaged. When the cord is moved, power stops coming from the adapter to the laptop and it starts running from the battery. In most cases the damage occurs in the area where the cord is connected to the power plug.

You have a couple of options here:
1. Test your AC adapter with a voltmeter. Make sure the power is not cutting off when you move the power cord.
2. Test your laptop with another known good AC adapter.

If you still experiencing the same problem with a new AC power adapter, most likely your problem is related to the power jack inside the laptop. The power jack is a socket where you plug the adapter.

It’s necessary to remove the motherboard and take a closer look at the power jack.
1. Resolder the power jack if it’s not making good contact with the motherboard.
2. Replace the power jack if it’s broken.

The laptop turns on when you press on the power button but shuts down right away. There is no image on the screen. You tried using the laptop just from AC power with the battery removed, but it doesn’t help.

Possible cause:

1. AC adapter is dead.
2. Motherboard failure.

Possible troubleshooting steps and repair solution:

First of all, test your AC power adapter. It’s possible that the adapter is dead and the battery doesn’t have enough charge to start the laptop. You can test the adapter with a voltmeter. Find out if the adapter outputs correct voltage. If there is no voltage coming out, replace the adapter with a new one.

Alternatively, you can test the laptop with another known good AC adapter.

If you still experiencing the same problem even with a new AC adpater, most likly you have the motherboard failure. Replace the motherboard.