Diagram battery no detect

Battery is bad, or the Power MOSFET's in the DC - DC circuit on the motherboard; are bad...........

Using the HP Pavilion dv6000, and HP Pavilion 9000 series of Notebook PC's; as an example,

http://mayohardware.blogspot.com/2010/04/important-parts-on-dv6000-and-dv9000.html

Alpha & Omega Semiconductor LTD - AO4407 - Power MOSFET,


http://www.mouser.com/Search/Refine.aspx?Keyword=ao4407


The AO4407 is Obsolete.
Using one of the cross-reference examples shown,


http://www.mouser.com/ProductDetail/Diodes-Inc/DMP3020LSS-13/?qs=%2fha2pyFadugQJEAqJYuwC0NlHVHA8ivkIi5yij9Xhac5DoEAek3FbA%3d%3d


http://www.mouser.com/Search/Refine.aspx?Keyword=fds6679


The Fairchild Semiconductor Industries - FDS6679 - Power MOSFET, is also Obsolete.
Using one of the cross-reference examples shown,

http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/FDS6679AZ/?qs=sGAEpiMZZMshyDBzk1%2fWi1qxDdW%2fXBi2qgMuZEfLVO4%3d

Where are these power MOSFETS located on the motherboard, for the HP G42 series of Notebook PC's?
In the DC to DC circuit on the motherboard.

Where is that?
Where the DC Power Harness plugs into the motherboard,

http://www.ebay.com/itm/HP-CQ42-DC-POWER-JACK-CABLE-DD0AX6PB00-/150980034385?pt=UK_Computing_LaptopAccessories_PowerSupplies&hash=item23271c7f51

[ The jack on the laptop that you plug the AC adapter into, {Charger}, is the DC Power Jack.

When the DC Power Jack is connected to wires, or a cable; it is then known as a DC Power Harness.
Some refer to it as the DC Power Cable ]

Let's look at an example of a motherboard, as used in the HP G42 series of Notebook PC's,
http://www.ebay.com/itm/HP-COMPAQ-G42-G62-CQ42-CQ56-CQ62-CQ64-Intel-478-LAPTOP-MOTHERBOARD-605140-001-/350675071935?pt=Motherboards&hash=item51a5dcf3bf
The large main photo that automatically comes up, is a TOP view of the motherboard. To the far Right is where the DC Power Harness plugs in.

You can set your mouse cursor in the middle of the photo, and this activates the Zoom In feature.

How do I know? I'm looking at the Service Manual right now,
HP Support > HP G42-415DX Notebook PC > Main Support page,

http://h10025.www1.hp.com/ewfrf/wc/product?cc=us&lc=en&dlc=en&product=5048627

Click on -> User Guides, in the list.

Click on >
Compaq Presario CQ42 Notebook PC and HP G42 Notebook PC - Maintenance and Service Guide

For additional questions please post in a Comment.
Regards,
joecoolvette