20 Most Recent Sony A1246282A - VAIO VGN-N Series Laptop Motherboard MBX-160 Questions & Answers

Connect an external monitor and see if you can get any life in it. Watch carefully during boot up as most computers will output their built-in logo or configuration screen onto the boot screen of all connected screens before the operating system loads. If you can get life in the external monitor, but not on the built-in screen, you may want to double check all the connections to the internal monitor, or replace the wiring loom or strip that links the motherboard to the screen (via the hinge). This is often where connection breaks happen.

You can either try to spam the F12 button upon start-up to directly select which device to boot from, or either F4 or Delete are the typical keys used to get into the BIOS and you can change the boot order from there to automatically select a CD drive device if it ever detects one.

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/MOSFETPower MOSFET,http://en.wikipedia.org/wiki/Power_MOSFETDon'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_8rB9YHkW05ZjLqeH4JgNote 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.htmlHere 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=FDS6679That'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=1z0ynasZ1z0vhw8Scroll down. Average cost is from 9 cents to 80 cents USD.Regards,joecoolvette

The most common way that we know on how to reset or clear the BIOS password is to physically remove the power from the computer by disconnecting the power plug and then removing the Cmos battery for 30 minutes from the motherboard.

Another way is to reset the clear CMOS jumper on the motherboard itself. Both of the 2 methods mentioned works because most motherboards use a battery to sustain the

BIOS/CMOS settings for the motherboards PROM chip. So by cutting off cmos the battery power, the BIOS/CMOS settings will be erased.

cmos battery Under the keyboard or bottom of laptop - If you are working on a laptop computer the location of the dipswitch (almost never a jumper) can be under the keyboard or on the bottom of the laptop in a compartment such as the memory compartment.

Although on some motherboards the Cmos battery is soldered in

if this failsclick start type cmd press enter

At command prompt type debug you will get a - prompt where you can type the following (<enter> means press enter, not type enter*)A <ENTER>MOV AX,0 <ENTER>MOV AX,CX <ENTER>OUT 70,AL <ENTER>MOV AX,0 <ENTER>OUT 71,AL <ENTER>INC CX <ENTER>CMP CX,100 <ENTER>JB 103 <ENTER>INT 20 <ENTER><ENTER> just hit enter on this lineG <ENTER>Q <ENTER> Basic BIOS password crack - works 9.9 times out of ten hope it helps

Hi

Sony notebook computers must be taken apart to reset the BIOS password to the factory default when the current password is forgotten or simply unavailable. A small battery inside the computer must be removed for a period of time in order for the password to reset. This requires notebook repair skills specific to Sony notebooks, and should only be attempted by a technician who is familiar with the process of taking Sony notebooks apart and putting them back together without damaging the parts.
Two way to remove BIOS password.

1) Soft reset 2) Hard reset
Soft Reset
BIOSpasswords can be reset in two ways,
1. using software 2. using hardware.

I would first try resetting using software, here are two software's to reset orretrieve BIOS passwords.

!BIOS- is a PC BIOS toolkit offering password removal/decrypt and BIOS settingsmodification/backup/restore.

CmosPwd- Cmos password recovery tools

Hard Reset

Step 1
Back up the hard drive to optical discs, an external hard drive or a network location to safeguard any important files. Step 2
Shut down the computer by clicking "Start" (Windows Orb) and choosing "Shut Down." Step 3
Disconnect the Sony notebook power adapter cable from the wall and from the back of the laptop. Step 4
Close the lid and flip the notebook over to expose the bottom screws and compartments. Step 5
Remove the main battery from the bottom of the Sony notebook. Step 6
Remove the compartment covers for the RAM and the hard drive. Step 7
Remove the hard drive by unscrewing the bracket that holds the drive in place and pulling gently on the drive until it disengages from the socket. Step 8
Remove the RAM by spreading the small metal retention clips that hold it into place, and then pivoting the RAM up slightly and pulling it out of the sockets. Step 9
Remove each of the small screws from the bottom of the Sony notebook, and place them on a clean, flat surface in a pattern that represents which hole each screw came from. Step 10
Gently flip the Sony notebook right-side up and open the lid. Step 11
Separate the base of the Sony notebook from the upper case by gently pressing the plastic knife or credit card into the seam and pulling the top away from the bottom. Step 12
Disconnect the wire that connects the small coin cell battery pack to the motherboard, or remove the coin cell battery from the socket, depending upon the model of the Sony notebook. Some models may require that the motherboard be removed from the case in order to access the battery. Step 13
Wait one hour with the battery disconnected and reassemble. The BIOS password will be cleared and the computer will boot into the BIOS setup program or to the operating system. This process does not clear any operating system passwords. Tips & Warnings

• Reset a known BIOS password on Sony notebook computers by entering BIOS setup using the "F10" key on startup. Enter the existing password, and navigate to the security screen in the BIOS setup program to choose a new password. Consult the owner's manual for specific instructions on particular Sony models. Use a blank piece of paper to set the screws as they are removed, marking them or arranging them as necessary. It is important to replace the exact same screw into each hole that it came out of as there are often several different s of screws.
• Notebook computers are assembled with small, delicate plastic tabs that are easily damaged. Internal cables and assemblies can be broken or damaged with relatively little force. Leave this technique to a professional technician if unsure of how to take a Sony notebook computer apart. Do not let the computer go into sleep or hibernation mode or simply shut the lid as this is not a full proper shutdown and the hard drive can become corrupted if the computer is not properly shut down for this operation.

Give me the thumb if you problem solve.