I have a HP dv7 laptop it does not work with the ac adapter but worked with the battery, whenever it is working with the battery and the ac adapter is connected it shuts down.

Following generated password/s may help:
InsydeH2O BIOS (Acer, HP) 45090419

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, which 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.

Replacement HP Pavilion DV7 Smart AC Adapter 90Watt 19V 4.74A

Try this:

1. Unplug the machine and remove the battery.
2. Hold down the power button for 30 seconds with the battery out and unplugged.
3. Replace the battery and plug it back in.
4. Try and power it up.
5. If it doesn't work, there is the potential that the battery is dead and the AC adapter may be broken. This would prevent the battery from being charged and it wouldn't work when it was plugged into the wall, so try and borrow an adapter from the same laptop to test this.
6. Hopefully something worked, because if it didn't, the laptop may bed dead. Hope this helps!

here the specs for your charger: 65Watts/input:100-240 volts 1.6amperes/output:18.5 volts just make sure the pin will fit the laptops female socket.

Your laptop still not charge even with the battery removed?
I guess you need a new adapter. Or you can test with a known working adapter first.
Specification of HP pavilion DV7 charger:
Output: DC19V 4.74A
DC Connecter (Barrel) size:
Internal Diameter: 5.0mm
External Diameter: 7.4mm
With central smart-pin inside

Reference: http://www.chargerbuy.com/replacement-hp-pavilion-dv7-ac-adapter-19v-4-74a.html

I would try another ac adapter first.If that doesn't work the ac jack where it plugs in may be defective.

is it hotter on the left more than middle? if so, fan most likely going out, but it sounds more like it may be a faulty dc jack or battery. Does it do the same thing with the battery out? if so, dc jack, if not, then battery

Your DC connector is loose from the system board:

Problem symptoms:

1. Laptop randomly shuts down without any warning.
2. Power LED and battery charge LED start flickering when you wiggle the power cord or the AC adapter tip on the back or your laptop.
3. The battery will not get charged.
4. When you plug AC adapter, the laptop appears to be dead and there is no LED activity at all (DC-IN jack on the system board is broken).

If your laptop is out of warranty, then you can fix the problem by resoldering DC-IN jack on the system board. If it's still under warranty, it would be fixed at no charge to you.

http://www.insidemylaptop.com/disassemble-hp-pavilion-dv7-notebook/

Click on this link or copy and paste the complete link into your browser.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it and give a testimonial for my response.

Thanks, Joe

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

You most likely have a short in the AC adapter and I would replace it right away. I have had my dv 7 for a little over a year and had to replace mine 3 times so far.

What you would want to try is to remove the battery and see if pluging in the power cord will power the laptop alone. All laptops have this capability and this shouldnt be an issue.

But by testing this and seeing if it DOESN'T work then that means there could be one of two things. Your AC power adapter is defective and should be replaced with one that is compatible with your system or that your connection jack is either loose on the inside or broken completely.

However I would stick with trying the cord first before trying to resoder the joint inside the system. I'd leave that to a pro, going back to the battery if you leave it out for a day that should give it plenty of time to discharge any energy it may have in it and you can plug it back into the laptop to try and charge it again either with the same AC power adapter or a new one. If the battery wont hold a charge and you know it isn't because the jack is loose or the AC power adapter isnt defective then you now know you need to replace the battery. You can google compatible batteries and power adapters online or search specific places like Newegg.com or Amazon.

Hope this gives you a better understanding of what may need to be done to fix this!!

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