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Charging circuit motherboard - LATITUDE Dell Computers & Internet

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  • Dell Master
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That is the DC - DC circuit.
You will find it is the same circuitry that surrounds, where the DC Power Jack is soldered to on the motherboard; or where the DC Power Harness plugs into the motherboard.

[DC Power Jack attached to a small cable (Wires)
The cable ends in a male plug connector.
This now = DC Power Harness ]

This is an example of a DC to DC circuit on a laptop motherboard, and using the HP Pavilion dv6000 series, and Pavilion dv9000 series; of Notebook PC's.
It also shows the main electronic components that fail;
Power MOSFET's,

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

The Fairchild Semiconductor Industries - FDS6679 - Power MOSFET; and the Alpha & Omega Semiconductor LTD - AO4407 - Power MOSFET, is used.

http://www.mouser.com/Search/Refine.aspx?Keyword=FDS6679

Scroll down. Here we see the FDS6679 is Obsolete.
Let's take a look at the cross-reference example given,

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

One dollar and one penny - USD

Now for the AO4407,

http://www.mouser.com/Search/Refine.aspx?Keyword=AO4407

Using the first cross-reference example given,

http://www.mouser.com/ProductDetail/Diodes-Inc/DMP3020LSS-13/?qs=%2fha2pyFadujguNNSgppBRqXbOxXLwzGsZm9SWxz1EqWpzoSJOpHpWA%3d%3d

78 cents - USD

These are SMD/SMT.
Surface Mount Device/Surface Mount Technology,


Now I would like you to take a look at another electronic component that may fail. The MLCC's.
Multi-Layer Ceramic Capacitor.
They are also SMD/SMT.

Look at the second photo down on the Playtool link.
Shows the AO4407 circled in Yellow.
(You can click on the photo to enlarge)

See the small rectangular object to the immediate right, of the AO4407? Has a dark wide band in the middle of it.

There is one above it, one above that one at the Top; one to the right of the top one, and one to the right of it.
(Last one is mounted Horizontally. The others are mounted Vertically)

There are also 4 more smaller versions, at the Bottom/Left corner; of the AO4407.
These are MLCC's.

Here is an example close up. I'm going to use a 4.7uF (Microfarad), 16 Volt example,

http://www.mouser.com/ProductDetail/TDK/C3216X8R1C475K-EPOXY/?qs=sGAEpiMZZMvQvaS66kI3ThUn76Ya%2fK0ChCft2vaMHwo%3d

Regards,
joecoolvette

Posted on May 06, 2013

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