Question about Sony VAIO Laptop

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How do you reset the CMOS of the Sony PCG-7142L without removing the CMOS battery or disassembling the unit?

Posted by Erus on

  • 3 more comments 
  • Erus
    Erus Mar 08, 2011

    This isn't a core 2 duo. It is a standard dual core pentium. Just look at the model number for details. Alt Model number is VGN-NS110E.

  • Erus
    Erus Mar 08, 2011

    Forgot to mention in the original post that the reason for this is that the system will not boot to the point to allow you to use the default setting feature.

  • Erus
    Erus Mar 08, 2011

    That was already done. infact this unit was disassembled, reset that way via cmos battery and boot once. This is why i do not want to use the CMOS battery removal cause i don't want to keep taking the unit apart to do this. I know on other units this is not required.

  • Erus
    Erus Mar 08, 2011

    Figured it out. J3 in the memory compartment needs to be shorted to clear the CMOS. I knew other units had j1 or xxx but didnt' think the J3 would have done it. Silly mfgs havign to be different form the norm.

  • Erus
    Erus Aug 06, 2012

    nope you are wrong. an intelligent tech knows what to look for and if you look at my additional information, i figured out where the jumper set was located. All laptops have a hidden jumper set to clear the eeprom for the cmos, just need to find it. next time read the entire solution and also that it is overa year old.



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Even removing the cmos battery won't help cos this model has a eeprom to save the password. you have to send it back to sony .

Posted on Aug 05, 2012

  • axism Aug 05, 2012

    even removing the cmos battery won't help cos this model has a eeprom to save the password. you have to send it back to sony .




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To reset the cmos, enter the bios menu and select "Default Settings", press F10 and exit.

Posted on Mar 08, 2011

  • Erus
    Erus Mar 08, 2011

    System will not boot to allow for this to be done. Sorry forgot to mention that in the question.

  • specialistel Mar 08, 2011

    I would remove the hard drive and RAM.Then boot, it will go mad but at least it should reset things for you unless the motherboard is faulty or a partial/incorrect bios update has been attempted.
    Hope this helps.



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1 Answer

Sony vaio PCG-7142L keeps freezing

Can check if the battery is low ... or is not (or cannot) holding a good charge ... when you unplug it (from the charger) ... when this happens ?

If that is the case, it may "freeze" while it is busy trying to store the contents of your memory before it shuts down (or hibernates). Does it shut down (or goes into hibernate if you let it continue to "freeze") for a while ? If so, then it's your battery.

If the battery doesn't hold a good charge, the laptop will run only a short time (while unplugged) before it has to shut down due to low battery. And if this is the case, consider getting a replacement (new) battery. And follow the initial charging instructions (for a new battery) to lengthen the life of the battery.

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Sony PCG-7142L - VGN-NS110E CMOS Reset via jumper

This method will remove the master password from the system or reset the CMOS when the system will not boot to allow bios clearing.<br /> <br /> 1) First you need to remove the ram cover at the back of the unit.<br /> 2) Remove the battery from the unit<br /> 3) Remove the 2nd Dimm if it is there (the one closest to you)<br /> 4) Locate solder beads J3. This is what you will jump<br /> <br /> <br /> <img src="erustownsend_1.jpg" /> <br /> 5) Next you will need to lay the laptop on its' side.<br /> 6) Jump the J3 beads and then turn the unit on.<br /> 7) If you did this all correctly, the unit will clear its cmos and reset.<br /> 8) Turn unit off and then replace the memory, memory cover and battery.<br /> <br /> Good luck

on Mar 08, 2011 | Computers & Internet

1 Answer

Plzzzzzzzzz some one help me

Hi, unfortunately you will have to contact Sony for support as i am pretty sure they will have to reset the password in their repair centre.

Dec 20, 2013 | Computers & Internet

1 Answer

Pcg 7142l how can remove the BIOS password?

You'll have to reset the bios. Disconnect all power sources and remove the battery. Unscrew the panels on the bottom of the laptop and find the cmos battery, it'll be a small round shapped battery about the size of a nickel. Remove that battery and short the terminals together with a screwdriver or you can just leave it out for a while, between 18-84 hours.

Dec 19, 2013 | Computers & Internet

1 Answer

Sony vaio pcg-7142L user manuals

Keep this link somewhere (please)...


then see this:
Service Manual free download schematics datasheets eeprom bins pcb repair...

WOW this is one TOUGH model to find!


Nov 10, 2012 | Sony VAIO PCG-7142L Laptop Charger...

1 Answer

I want to clear CMOS

The CMOS is a block of static RAM that will lose its data if power is removed.
most newer laptops are using a small block of Flash RAM (perhaps a block of addresses within the Flash BIOS chip itself) or other type of EEPROM chip to store the password.

No amount of removing batteries and pressing power buttons will change it

you might get some more information from the manual

hope this helps

Jul 24, 2012 | Sony VAIO Notebook

1 Answer

How to reset bios password on sony vaio laptop?

Please open you vaio laptop from bellow instruction link.

Follow step 14
You can manege the idea about CMOS battery.

Follow step 11

But this is your actual model
Just remove the Cmos battery And wit 2 minutes again fit the battery .Your password will be soon reset.

Hope it will help you.

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Remove the small round cmos battery from the motherboard for about 5 seconds, replace & reboot. Hope this helps & please remember to rate my answer. Thanks.

Dec 29, 2008 | Computers & Internet

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