Help! How to reset the CMOS on 3000 N200 model 0769?


I need to reset the CMOS (the memory that contains the BIOS settings) on my laptop Lenovo 3000 N200 model 0769. Is it possible to do it without having to remove or the CMOS battery to short physically?

If I have to remove the battery, where is he? On other models of 3000 N200, the battery is under the keyboard and is removable (shown in the video on www.lenovoservicetraining.comand maintenance manual). However, for the model 0769 there no specific information. Page 99 of the service manual for the 0769 (42 x 3353 - 02.pdf on the Lenovo site) has a graph that shows what might be the CMOS battery near the right side of the main Board. Unfortunately it may well be soldered to the card, not removable.

Can anyone confirm if the CMOS battery is soldered to the motherboard?


It is possible that the CMOS is corrupted so that the POST/BIOS Setup screen does not appear. In this case, you need to reset the CMOS manually, for example by removing the CMOS backup battery, "a brick" laptop.

Fortunately, there is a way to reset the CMOS for the Lenovo 3000 N200 0769 model, which does not require the battery to remove or disable welded. It is not documented in the maintenance manual, but it can be extremely useful. If your machine sounds just a few times when you turn it on (Nothing on the screen, otherwise machine appears dead), it should reset the CMOS because that could save you having to RAM of the laptop, or pay $$$ for the out-of-warranty repair.

Turn off the laptop, remove the battery and the AC adapter / CC. Remove the access panel that covers the hard drive and the wireless card. Look at the corner of the CCP in the front of the wireless card. There are two metal tracks exposed labeled CLRP1. You must bypass these tracks together for a few seconds.

You can use the end of a small head screwdriver flat metal or if you have a multimeter set it to measure current and put a probe on each track.

After doing this the laptop must turn on correctly. He will tell you that the time and date is not defined, and that the CMOS checksum is bad. This is normal when the CMOS was reset. Press F1 to access the menu.

Tags: Lenovo Notebooks

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