How to locate and reset Acer 5920G CMOS Battery – without dismantling the whole laptop

The other day I had to reset the CMOS battery on my Acer 5920G laptop. I found a nice little short cut in getting the job done quickly and efficiently. After reading a couple of tutorials online most of the people said that I would literally have to completely dismantle the laptop (apart from the monitor of course), which seemed a little long-winded, seeing as that I was able to spot the CMOS battery just by removing the back cover.

The problem lies in its location. It is extremely difficult to get your fingers in where its connect to the circuit board without dismantling the case and circuit board (”No disassemble number 5” – Johnny 5). This guide will show you how to reset the CMOS battery by only removing the back cover of the laptop.

All you will need is a screwdriver and a pair of tweezers.

Step 1 – Disconnect the AC power from your laptop and remove the battery.

Step 2 – Using your screwdriver, unscrew the 9 screws (n.b 2 are hidden under two sticky black circular covers). Once the screws are removed, slide off the back cover and position your laptop as shown below, this will help you locate the CMOS battery a lot easier. Please note I was upgrading both my RAM and hard drive, that’s why they are not seen in the image below – you do not have to remove these for resetting the CMOS battery.

Acer 5920G: Remove screws and slide off the back cover

Step 3 – Tilt your laptop slightly upwards and look down inside where the circular volume slider is, you should see a twisted red and black cable which is plugged into a small square connector on the circuit board, this is the CMOS battery.

CMOS Battery: Red and Black Twisted Wire

Step 4 – Once you have located the CMOS battery, take your set of tweezers and carefully position them over the tip of the CMOS battery connector. Then pull it up to disconnect it (mine is disconnected in the photo – but I didn’t pull it right out, this making it easier to reconnect), leave it disconnected for 3-4 minutes, then reconnect.

Step 5 – Now that the CMOS has been reset, put the back cover back on the laptop and secure it with the screws you removed earlier. Put your battery back in and boot up your Acer 5920G and bingo, job done without having to take it all to pieces.

This method saves a lot of time and also saves you from dismantling the whole system to reset the CMOS battery.


About smellslikevictory

BEng (Hons) graduate in Electrical & Electronic Engineering. Enjoy travelling, working out and all things techy

Posted on October 8, 2011, in How-to-Guides and tagged , , , , , , , . Bookmark the permalink. 20 Comments.

  1. Matteo Pessina

    God bless you! Really really thank you!

  2. Hi , my name is juan carlos , i had the same problem but i could´t solve it , because i couldn´t clear the hdd password (bios) , if you can help me i would be grateful! Thanks!!

    Sorry for my english, im from uruguay.

    • Hello Juan, apologies for the late reply – I’ve been really busy latley and haven’t had the chance to come on here.

      If you still need help with this, can I just confirm one thing? Is it the BIOS asking for a password or the hard drive ?

  3. awesome! thanks 😀

    In the service manual the only mention of cmos is to do with taking the monitor off :s lol

    You helped a lot (o__o)b

  4. Eres un genio hermano. Me funciono perfectamente. Tengo una laptop acer 5920 y esta tenia una clave para entrar en las Bios; hice el procedimiento que sugeriste y ahora puedo entrar a las bios sin clave. Gracias. Te amo.

  5. Thank you mate…! Was tearin’ the last little bits of my hair out until your advice helped me. Dis it in 10 minutes and all is hunky dory again. Was about to buy a new hard disc to reconfigure everything and clone the old one onto it…Ta..!

  6. thanks.. helped a lot

  7. Sir, you are my hero

  8. and for to change cmos battery ? my battery is low ( I´m sorry , no hablo ingles , thanks )

  9. Thx a lot! CMOS-password was deleted after two minutes. 🙂

  10. Thanks! You saved me a boatload of time!

  11. Great Thank you so much for this information worked like a charm, By the way will this work with other laptops or just the Acer 5920?????

    • Glad it worked! I presume you could do the same with ither laptops, but it all depends on where the cmos battery is located. In any case, i would always check first as removing it this way saves a lot of time and hassle.

  12. Buen trabajo, muy util y facil! Gracias

  13. Gooooood THKS

  14. Thanks. Worked like a charm.

  15. Cristobal Campos

    Excelente Muchas semana gracias

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