Replacement CMOS for Toshiba E45T-B4106

noobfrank02

Prominent
Feb 26, 2018
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Wrenching on a friends Toshiba Satellite E45T-B4106 (Part# PSPNCU-004002).

Upon boot up it asks for the date and time. Everytime you unplug it you have to input the date and time. Needs a new CMOS or RTC battery? Right?

Opened it up and just can't find anything that resembles a battery. The main battery is a dud too. So after thinking about it - I am starting to wonder if the CMOS is inside the main battery or uses the main battery? Surfing Toshiba's site doesn't pop up anything. Can anyone confirm where/how the battery is?

Thanks in advance!
 

Phillip Corcoran

Splendid
Moderator
No, nothing to do with the main battery - - the CMOS battery is a separate one, usually in the form of a silver coin-shaped battery like those used in car remotes & other electronic devices.

You often have to flip the motherboard over to see it on a laptop, and be aware that new one may require wires soldering in place if the battery isn't held in place by a clip as on desktop motherboards.
 

noobfrank02

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Feb 26, 2018
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Phillip - I appreciate your reply. YEP - I am familiar with soldered in place CMOS batteries. But honestly - I have reviewed this motherboard from end to end and can't find anything that looks like a battery.

Here are some pictures of what I found when taking it apart: https://www.amazon.com/H000080900-Satellite-E45T-B4106-Motherboard-i5-5200U/dp/B018KX60QQ

Of course - Toshiba doesn't show a replacement CMOS
http://us.toshiba.com/accessory-finder?accFinderCat=All&part=PSPNCU-004002&stt1=All&stt2=All&sttSeries=All&stt3=All&x=150&y=16&accFinderCatFriendlyName=Battery

Going to their parts partner I looked at the available parts here:
https://encompass.com/model/TOSPSPNCU004002

I can't find the CMOS battery there either.

So - I agree with you - it is not usually in the main battery - but since the main battery is not user removable I was just thinking outside the box... where could the RTC battery be?

Phillip - I really appreciate your reply but I am hoping that somewhere there are some details to where this sucker is?

Thanks
 

noobfrank02

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Feb 26, 2018
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I guess I can't mark this as solved myself?

Well - I guess there are a bunch of new Toshiba's that are just designed without a CMOS and just use the main battery.

http://www.tomsguide.com/forum/id-3447806/cmos-battery-...

I haven't found a manufacturer's list proving which model numbers... but the lack of a replacement part number is good enough for me at this point.

Thanks again for the help!.
 

noobfrank02

Prominent
Feb 26, 2018
4
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510
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Confirmed: Got the new battery installed this week and all is working well with this laptop.

I am still new here so I am sure there is a way - but I'd say that this question is solved. So please let me know what I am supposed to do to mark this as solved.

Thanks,
 
Aug 2, 2018
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I think the main battery also acts as the power source for the cmos. If you remove the battery and plug it back in all the settings in the bios ( time and date included) are reset.
 
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