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HP Laptop Help

P

PhilipB

n00b
Joined
Dec 11, 2007
Messages
11
Wondering is anyone can assist with this.

I have an HP Pavilion dv7t-1200 CTO laptop. The Laptop itself is nice, HP sucks. It had to go back to them 1 month after purchase, and again 4 months later. Shortly after the warranty expired, the battery stopped charging.

The issue is that the battery doesn't charge when inserted into the laptop. I have bought another battery, bought another power supply, bought and replaced the power supply receptacle inside the laptop, and ran through the Win7 driver uninstall/reinstall procedure that's all over the net and all of this was to no avail, neither of the two batteries I now have will charge regardless of which of the two power supplies I use.

Both power supplies enable the laptop to run off wall power.

The chances of both the new and oem battery being bad are negligible.

The battery itself has eight tabs its side that slide over 8 tabs in the battery compartment of the laptop. Of the eight tabs, two are identical in size, and the other 6 are identical in size to each other. The 6 tabs are slightly smaller than the two tabs. From this I deduce that the six are used to charge the battery, and the two are used to power the laptop from the battery.

So, here's my thought. I have the old power supply receptacle that came out of the machine. This went from the side of the laptop which the power supply plugs into, to the mobo. It has four leads, red and black which seem to be the primary power supply leads carrying about 18 volts. A white lead that simply seems to bring power back to an led on the receptacle. And a yellow who's purpose I haven't figured out yet.

I'd like to wire the old power supply receptacle to a set of tabs that I can insert into the battery and charge the battery while it is out of the laptop.

I've been all over the net and can't find any schematic that indicates if my assumptions about the battery tabs are correct, or if the laptop's mobo steps down the voltage before sending out to charge the battery.

Anyone have any pointers on where I can find this info, or has anyone gone about building their own laptop battery charging station?
 
If the battery won't charge in the laptop and both the battery and AC adapter are fine, then the problem is with the laptop motherboard and there's basically nothing you can do to fix it. You probably can't just connect the battery directly to the power supply since there may be some charging circuitry built into the laptop to prevent the battery from being charged improperly. However, I'm not an expert with this sort of thing so it's possible that I'm wrong.
 
Thank you.

Yes, I know its the mobo. The charging circuit went bad. But the laptop works fine off wall power. And if the battery was charged, it would work off the battery.

All I want to do is charge the battery. I'm not dumping another $300+ into an HP product, their customer service is awful, the only thing worse is their products. This thing went back 2x already in the first 8 months.....just awful. I'm trying to just get some more life out if it before I decide to use it as a target.
 
You'd have to find another compatible laptop or some sort of charging station to charge that battery.

Might be kinda tough to do, but it'd be cheaper than paying to have the mobo replaced
 
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