Question about Sony A1246282A - VAIO VGN-N Series Laptop Motherboard MBX-160
Bought new CPU and bios battery and new motherboard to replace the old faulty one but can't get it to turn on. LED 6 comes on and stays on when i turn it on using the power supply.
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Posted on Jan 02, 2017
SOURCE: sony mbx-49
Sorry for the delay responding.
Info comes from
Joe K Sony Vaio
Hi Joe I have a unit now with the MBX 49 board that is totally dead does not charge battery or work from a known charged battery.
The small fuse at the rear F2801 is OK, 19V on input to Q2803 nothing out from one that I worked on earlier I noted that this should have
19 on the output. This is a fet and is not being swithed on as the gate is also at 19V not pulled low as for P channel fet.
--- In Laptop_Repair@yahoogroups.com, "Joe"
Posted on Aug 20, 2007
sony got two diffrent chagers one its 16v and the other its 19v so chk which one is correct then buy the correct one,its written @ botton of it
Posted on Aug 11, 2009
Tips for a great answer:
Flashing a motherboard's BIOS can have many positive purposes and can help keep a motherboard compatible with changing technology.
PCnineoneone.com says that a proper BIOS flash can introduce enhanced features and bug fixes for the motherboard.
However, a bad BIOS flash can be devastating to a computer owner and very difficult to recover from.
If the proper preparations are made and all instructions are followed, a bad BIOS flash can be corrected.
Remove the side panel of the computer case, using the screwdriver to unfasten the screws normally located in the back.
Remove the jumper from its normal position on the motherboard and place it in the recovery position.
Usually, the jumper will need to be moved over one space to cover a previously exposed prong.
Locate the BIOS CMOS jumper on the motherboard, usually in the bottom, right corner.
The jumper consists of three metal pins facing upward and is usually marked with "CLR_CMOS" and has a plastic cap over two of the pins.
Check your specific motherboard manual if you are unsure where the jumper is.
If the motherboard does not have a jumper, removing the battery for 30 seconds and then replacing it may have the same effect.
Insert the BIOS flash disk and power on the computer.
If you used a flash tool or utility and did not create a BIOS flash disk before flashing the BIOS, then you will need to do so using a functioning computer.
Since there will be no video, listen for the internal PC speaker to beep.
This means it is performing the BIOS upgrade.
Power down the computer once the BIOS upgrade has been completed.
This process may take some time to complete, so be sure to not turn the computer off before the BIOS upgrade is finished.
Without video, the only way to be sure is to listen to the PC speaker.
When the upgrade is done, the PC speaker will beep again, and the floppy disk drive will turn off.
Replace the jumper back in its normal position and put the side panel of the computer back on.
Power the computer on.
If the computer turns on as normal, the recovery was a success.
How to Recover My Laptop BIOS
The BIOS is the basic input/output system on your computer that normally runs invisibly in the background, yet it's required for your computer to perform even the simplest task.
When something goes wrong with the BIOS, you might have difficulty even booting your computer.
There are a number of things you can do to recover a laptop BIOS that has gone wrong, ranging from relatively simple to somewhat costly.
Recover your BIOS by restoring the manufacturer settings as the first line of defense.
Reboot your laptop, reading the on-screen startup messages to determine what key you have to press on to enter the BIOS (normally "Esc" or "F2").
Press on the key when required to avoid booting into the main operating system, going instead to the BIOS screen.
Locate the item named "restore default settings" or "restore manufacturer settings"
(or something along those lines) within the BIOS.
Select this option using the arrow keys and pressing on enter, confirming when requested by pressing on the "Y" key.
This restores all of your old BIOS settings, potentially recovering your laptop BIOS with a minimum of fuss.
Send your computer back to the manufacturer or to an authorized dealer if restoring the factory default settings doesn't work.
The technician removes the old, faulty BIOS chip, replacing it with a new chip if possible.
It may also be a problem with the battery connected to the BIOS, which is always removable.
In many cases if the BIOS itself is the problem, the entire motherboard must be replaced since the BIOS chip is rarely removable in a laptop.
Hope this helps
Oct 31, 2012 | Computers & Internet
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 fails
click 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*)
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 line
Basic BIOS password crack - works 9.9 times out of ten hope it helps
May 25, 2012 | Sony A1246282A - VAIO VGN-N Series Laptop...
Test all leads that attach to your hard drive including electrical extensions SATA
the leads from your MOTHERBOARD TO YOUR HARD DRIVE make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error
even something as small as a faulty electrical extension or fan lead can cause you problems
computers need all of the data and electrical current to travel through every working device and to have an end to be able work properly
motherboard and a hard drive any leads between them will fail before your motherboard or your hard drive if its a flat ribbon 40 pin type IDE replace it this will be the first to fail
check all electrical power input and extensions make sure they are securely seated even the cd/dvd floppy drives need to have current go through make sure these drives are working
also check the Cmos battery and computer RAM modules make sure they are securely seated with no dust built up or in the sockets on some motherboards cmos batteries are soldered in
check you CPU make sure its securely seated and has thermal grease might be getting to hot
another possible reason could be a memory dump you might be running to many programs at the one time putting to much strain on the CPU central processing unit
hope this helps you
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