Question about Sony VAIO VGN-A790 Notebook

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I have bought a sony vgn-n38e anf i am not able to scroll up or down on the right hand side of the touch pad, i would like to know if there is simply a button to press to rectify this or if it is possibly broken?

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So you need to update driver for this touchpad scrolling error.

Please click on the below link
ftp://download.sony.com/US/pc/ALDOTH-00199336-US.EXE

This will download the driver for your touch pad then you need to run the driver that you downloaded.
Then restart the notebook
Check whether it is working.

you can find other drivers for Sony Vaio VGN-A790 on the below link.

http://www.notebook-driver.com/sony-vaio/sony-vaio-vgn-a790-notebook-windows-xp-drivers/

Hope this resolve your query.
Kindly provide your valuable feedback for this answer

Thanks.

Posted on Nov 11, 2010

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Link to the Service Manual, Donald,

http://www.tim.id.au/blog/tims-laptop-service-manuals/#toc-sony

That Sony VAIO VGN-N38e, is part of the Sony VAIO VGN-N series of Notebook PC's.

Scroll down to the 8th line that begins with the blue -> VGN-A
Scroll across, and click on the blue -> VGN-N

PDF file. and the computer you are using now has Adobe Reader on it, which uses PDF files.
May take up to 30 seconds after you click on the file name (VGN-N), before the first page comes up.
The file is downloading in the background.

That is the Service Manual. It doesn't have board level component replacement.

Is there a board level component that you feel needs replaced?
What are the symptoms of the laptop?

Power issues, if not the AC adapter, (Charger), or DC Power Jack; are related to the Power MOSFET's on the power circuit of the motherboard; and may also have bad MLCC's in that circuit.
(Multi-Layer Ceramic Capacitor)

[DC Power Jack is part of the circuit. Where it is attached look at those P.MOSFET's.
Example using HP Pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's,

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

These series of HP's use the Fairchild Semiconductor International - FDS6679 - Power MOSFET, and the Alpha & Omega - AO4407 - P.MOSFET.

Looking at the second photo down, with the AO4407 circled in Yellow; look at the small rectangular object to the immediate right, that has a wide dark band on it.

There is one above it of the same size, and one above that one.
There is also one to the right of the top one.

These are MLCC's.

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

Scroll down.

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

AO4407 has been phased out. List shows cross-references.

http://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-b2cj?P=1z0wrjcZ1z0x565

Just 4.7Mfd examples at 16 Volts.
Do not know the values of yours ]

Electrolytic Capacitor/s replacement?

OH, just cleaning the laptop out?
S'okay I was just letting you know board level replacement is possible.
(Does kinda' depend on your de-soldering/soldering skills, though)

Reply in a Comment.

Regards,
joecoolvette

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