Question about Biostar P4TGV-R (U8668DCOMB7) Motherboard

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P4tgv-r mother board not starting, only hd led is on no volyage on dc to dc convertor mosfet, 11.9 v on only one mosfet drain terminal,all other voltage are 0.

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CHECK ALL ELECTRICAL WIRES MAKE SURE YOU DON'T HAVE ANY LOOSE ENDS,ALL SHOULD BE TIGHT.
IF IT STILL DON'T WORK TRY WITH A OTHER POWER SUPPLY.

Posted on Oct 19, 2013

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Free download schematic diagram laptop mother board toshiba tecra8000


Believe problem to be one of the Power MOSFET's, in the DC - DC circuit on the motherboard

http://en.wikipedia.org/wiki/DC-to-DC_converter

Using the HP Pavilion dv6000 series and Pavilion dv9000 series, of Notebook PC's for an example,

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

The two Power MOSFET's used; are the Fairchild Semiconductor Industries -FDS6679 - Power MOSFET, and the Alpha & Omega Semiconductor LTD - AO4407 - Power MOSFET.

Showing availability and cost. Using just FDS6679 for an example,

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

Obsolete. Using cross reference match example,

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

One dollar and one penny USD.
AO4407 is obsolete too. Cross reference match example for it, cost is 78 cents USD.

NOT stating the P.MOSFET's are used on your Sony VAIO's motherboard. Showing what a Power MOSFET looks like for this type of application, and availability/cost.

Look on your motherboard in the DC - DC converter circuit area, where the DC Power Harness plugs in.

[The AC adapter (Charger), plugs into the DC Power Jack on the laptop. (DC_IN)

For your laptop the DC Power Jack is connected to wires, that end in a male plug connector. The male plug connector plugs into the motherboard.

It is now called a DC Power Harness ]

Let's take a brief look at a motherboard example,

http://www.ebay.co.uk/itm/Sony-Vaio-PCG-6L1M-Laptop-Motherboard-A1171213A-Spares-Repair-NO-POST-/360566230317?pt=UK_Computing_Housings_Touchpads&hash=item53f36c0d2d

(Sony VAIO PCG-6L1M and VAIO VGN-B1VP are supposed to be the same)

The Main view shows up automatically, with the Top view of the motherboard.
Scroll down for Bottom and Top view.

Again there is a Main view, and this time two smaller views to the Right.
Top small view is Top view of motherboard.
Bottom small view is Bottom view of motherboard.

Looking at Bottom view of motherboard, believe DC Power Harness plugs into the Right side.
Series of Power MOSFET's are on the right side, also.

WEAR an ESD wrist strap, and have it's alligator clip attached to a good ground source.
Here is free access to the Service Manual.
You want VGN-B

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

Bottom line -> VGN-A
Scroll across, click on VGN-B
(It's a PDF file)

http://www.youtube.com/watch?v=3NN7UGWYmBY

Regards,
joecoolvette

May 01, 2013 | Computers & Internet

1 Answer

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

I have lost my CD. Now i need Sound and VGA driver for P4 TGV-R VER 8.1 MOTHER BOARD


Hello,

Have you tried the following drivers? Its listed for the P4TGV-R V 7.x however they still should work for your board also (the site doesn't specifically list an 8.1), the audio drivers should be in the first driver package.

http://www.biostar-usa.com/app/en-us/mb/driver.php?S_ID=225

Regards,

Brandon

Dec 09, 2010 | Biostar P4TGV-R (U8668DCOMB7) Motherboard

1 Answer

Battery is not charging. I replace the Battery and It did not make any difference


I suspect a mother board problem. Possibly a fuseable link or unfortunately the DC-DC convertor charger.
Hope it is just a fuseable link but I have my doubts.

Nov 09, 2010 | Toshiba Satellite M55-S3291 Notebook

1 Answer

Mosfet check


1. Switch your multimeter to the Diode test position.
The following steps are for an N-Channel MOSFET.
Hold the Black lead to the MOSFET's source terminal.
2. Touch the GATE terminal momentarily with the Red lead.
3. Then touch the DRAIN terminal with the Red lead without touching the GATE terminal with your fingers.
The multimeter should show a low reading now. (The MOSFET is now ON)
4. With the RED and BLACK leads still connected to the DRAIN and Source terminals of the MOSFET, now touch the GATE terminal with your finger. The Multimeter should immediately show an open cct. (The MOSFET is now OFF)
This is a very simple way to test a MOSFET.

Jan 13, 2010 | Epson >>> IM800 DARK GRAY 733 MHZ CPU...

3 Answers

Cannot turn on cpu


when you say cannot turn on cpu - what do you mean - ?
cannot boot up?
try removing the cmos battery for a minute then replace and try again.

any error beeps ?


working fine before ?

Oct 11, 2009 | E-Machines eMachines Desktop PC

1 Answer

865 MOTHER BOARD VOLT OUT PU PIN


Hi Dear, well, you can get 1v dc or 1.5v dc from any pc motherboard but I'll never recommend you to do that. You can use Black and Red wire combination to get 5v dc or Black and Yellow wire combination to get 12v dc from motherboard's power supply. 3 LEDs in series can b use for 5v dc input.

Mar 31, 2009 | Intel D865GBF Motherboard

2 Answers

Ihad lost my driver cd


I HAVE P4 TGV-R VER 8.1 MOTHER BOARD
I WANT AUDIO & VIDEO DRIVER FOR IT

Mar 25, 2009 | Biostar P4TGV-R (U8668DCOMB7) Motherboard

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