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Laptop motherborad reparing

You have a problem to troublshoot your laptop motherboard ?the easiest method is:look for the POWER MOSFET and check if shorted replace with the same part or equivalent.Power mosfet is a coponent like this picture:




use this two link to download datasheet :http://www.datasheetcatalog.com/www.alldatasheet.com

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ihave mbx -160 ms70 sony laptop mother board ther is no power adapter is working pleas telme whatare the comapnents i have to chek in power section


A) Check the DC Power Jack.

The DC Power Jack is the jack that the AC adapter (Charger) plugs into. (May state DC_IN near the jack on the outside of the laptop case)

IF, I have it right, there is a DC Power Harness. The DC Power Jack is connected to wires in a harness, and the harness has a plug on the end. The DC Power Harness plugs into the motherboard.

http://www.laptoppartsexpert.com/i-131440-dc-jack-w-cable.html

[Instead of the DC Power Jack being soldered to the motherboard]

Remove the DC Power Harness, and with a multimeter set to OHM's perform a continuity check of all wires in that harness.
See if the DC Power Jack of the harness, is in good shape.

DC Power Harness checks out?
Problem is with the Power MOSFET's on the motherboard, or a ceramic capacitor, or two.

!O_O!

MOSFET,

http://en.wikipedia.org/wiki/MOSFET

Power MOSFET,

http://en.wikipedia.org/wiki/Power_MOSFET

Don't know who makes the P.MOSFET's on the motherboard, or what manufacturer number they are.
They are however, located Near the connector on the motherboard for the DC Power Harness, and they have 8 J-leads.

This is an example of a Fairchild Semiconductor FDS6675BZ
Power MOSFET. One example of a P.MOSFET used in this application, on a LOT of laptops,

https://docs.google.com/viewer?a=v&q=cache:oER5NNz8cwcJ:www.fairchildsemi.com/ds/FD/FDS6675BZ.pdf+Fairchild+FDS6675BZ&hl=en&pid=bl&srcid=ADGEEShOhWPjm_M-ROHme4iEMrztCTOd-28jNiy1hVLQQh_VOyv8zcXEVDB_iTQA6MuZO88UmRkDgjyW9j4CP2aIJ-4DS-h6JNM3lvxldeApQeecmz_DADCw1s7tmNLxfPknqX14SZP6&sig=AHIEtbS_rYUAeo_8rB9YHkW05ZjLqeH4Jg

Note the leads coming off of both sides. Those are 'J-leads'.

See if any of the Power MOSFET's, or Ceramic Capacitors, are burnt, and/or bubbled.

This gives you more information, but is using HP Pavilion dv6000, and Pavilion dv9000 series of Notebook PC's, as an example,

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

Here you see the two Power MOSFET's used. One on top of the motherboard in the power section area, one on the bottom of the motherboard.

Looking at the second photo with the Alpha and Omega AO4407, Power MOSFET as an example, look to the right of the yellow circled AO4407.

To the right is a Ceramic Capacitor.
Rectangular in shape, and looks like there is a black wide band across the middle. There are two more above it. See if one, or more of these are burnt.

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

That's right. A Fairchild Semiconductor FDS6679 Power MOSFET is $1.01 USD, without tax, and shipping.

Just an example of cost.

http://www.mouser.com/Passive-Components/Capacitors/Ceramic-Capacitors/Multilayer-Ceramic-Capacitors-MLCC-SMD-SMT/_/N-b2cj?P=1z0ynasZ1z0vhw8

Scroll down. Average cost is from 9 cents to 80 cents USD.

Regards,
joecoolvette

Sep 29, 2012 | Sony A1246282A - VAIO VGN-N Series Laptop...

1 Answer

no power


You have a shorted power mosfet beside and the buttom of the power supply connector. You don't need a schematic to check that.

Jul 24, 2009 | HP Pavilion ze1210 Notebook

1 Answer

mosfet in my asus motherboard burnt out,


Better to have the motherboard replace, do not wait until some other components might be also damage. Commonly mosfet is use in power supplies regulator. It can kill your processor and memory.

And also check your power supply. It might also having problems.

May 02, 2009 | ASUS P4GE-MX Motherboard

3 Answers

motherboard not powering up


hi this is parveen

solutiom for d845gvsr not poweringup only led flashing--

short pin 92 and 93 of smsc LPC47M172 with fine tip soldering iron .
pin 92 is nrsmrst signal that is 3.3v at time of working m/b when this signal is low than motherboard not powering up so we short pin 93 that is standby (3.3v) and motherboard powering up again and working properly this problem doesn,t come again in future. this solution is 98% working 2% chances to change the chip.

Aug 07, 2008 | Intel Motherboard

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