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 Post subject: RTC Battery Message
 Post Posted: Wed Jan 09, 2008 9:09 am 
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Joined: Fri Jul 27, 2007 9:37 am
Posts: 73
Location: Anaheim Hills, Ca
Hi Scott,

I am working on a Toshiba A15-5129 laptop and when I boot it up it says:
RTC battery is low or CMOS checksum is inconsistent . Press F1 key to set
Date/Time. S/N 93094520P

I purchased a new CMOS battery and installed it I still get the same message at start up when I push F1 nothing happens. Help!

Thanks, Craig


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 Post Posted: Wed Jan 09, 2008 12:53 pm 
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Joined: Sun Feb 04, 2007 11:44 am
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Try to get into the BIOS Setup to change the date/time. On Toshiba laptops there can be several methods, some of which require running a HWsetup program in Windows. See p. 126-127 of URLaptops 2nd edition for the details.

If you can't get into the BIOS setup, then remove the main battery and try again (running on AC power only). If that doesn't work, then remove the main and CMOS battery, leave the system unplugged for a while, then reinstall the CMOS batter and try again on AC power.

Let me know how it works out, Scott.


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 Post Posted: Mon Jan 14, 2008 11:21 am 
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Joined: Fri Jul 27, 2007 9:37 am
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Location: Anaheim Hills, Ca
I tried all your steps listed the same message appears on boot up.
The Cmos battery on the laptop is buried so the entire machine need to be taken apart and put back together. Left the CMOS battery unconnected
for over two hours. Is there anything else we can do to resolve this issuse?

Thanks, Craig


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 Post Posted: Mon Jan 14, 2008 12:26 pm 
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The machine should be stripped to the bare minimum. That means no drives of any kind, no batteries of any kind (main or CMOS), remove all memory except one module, etc. In short, disconnect everything not necessary to run the BIOS Setup, which is pretty much everything except the processor, one bank of memory, the display and keyboard.

If you still can't get into the BIOS Setup after this, then I'd further disconnect the internal display as well as the keyboard, and attach an external display and keyboard. Also replace the one bank of memory you are using with a known-good spare. Finally, you should also try a replacement (known-good) AC adapter.

Still no-go? Bad motherboard and/or CPU, as we've pretty much eliminated everything else. <g>

Let me know what the problem turns out to be, Scott.


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 Post Posted: Wed Jan 16, 2008 9:45 am 
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Joined: Fri Jul 27, 2007 9:37 am
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Location: Anaheim Hills, Ca
I did everything that you listed to do and get the same message.
Except when all the drives are removed I get a #ide on the screen.
Just curious what you think is wrong, I know the motherboard or
CPU if it is the system board could the CMOS chip be bad? I found
this motherboard on Ebay for $125 plus shipping like to maybe buy
it but I don't want to find that the cpu is bad.


Thanks, Craig


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 Post Posted: Wed Jan 16, 2008 10:40 am 
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That system apparently uses a rechargable RTC battery, which charges only while the system is actually running. If the system is off for a while, the RTC battery will discharge, possibly resulting in the message you describe. Leave the system running for a day or so to recharge the RTC.

I'm not clear on whether the system can actually boot or not (despite the error). If it can boot, what happens when you run the Toshiba HWSetup program?

If the system can't boot Windows, or even to a DOS floppy, then I'd guess that the motherboard is bad. Let me know the final outcome, Scott.


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