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Thread ID: 17776 2002-04-11 04:40:00 Changing CMOS battery??? Guest (0) Press F1
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43248 2002-04-11 04:40:00 I was going to change a friend CMOS battery. When I went to look the battery wasn't as obvious as I was expecting, DAMN... SO what where would the older style one be & how hard is it to replace.

Is it the RTC module?
The RTC has ODIN OEC12C88887A printed on it.

Stumped, any ideas.

Cheers 		Guest (0)
43249 2002-04-11 05:29:00 If your friends motherboard has what is called a Dallas Real Time clock chip, then... el tougho. They are nearly always soldered in, sometimes socketed. They contain the battery, they are supposed to last up to 10 years, but when they go flat then you may as well throw the M/B away.

If it is socketed it may be possible to replace it, but memory says they are about $60 or so if you can get one.

The number you quote doesnt ring a bell, but I will do a search.

Cheers 		Guest (0)
43250 2002-04-11 05:35:00 Since you didn't state what type/age of PC we are talking about.

1. Find the manual if possible. If not jot down the Mobo's make/model and search the net for manual (hopefully).

2. The batteries as far as I know are either the

a. Bright Blue barrel style (on old pre Pentium PCs) which are soldered to the Mobo.

b. Coin size batteries

c. a long rectagular box the size of an AA battery with two cables connected to pins on the mobo. Usually have a velcro patch on it to hold to side of power supply or case.

d. any other weird shapes and sizes which I haven't encountered before

For (a) there should be a secondary battery pin which will allow you to use (c) style battery.

For (b) you need to pry out the old one and put a new one in.

Some of the older batteries are located on the mobo and hidden under the drives or power supply. You may need to lift out the drive or power supply to get to it.

Good luck. 		Guest (0)
43251 2002-04-11 05:36:00 What sort of computer and how old Scotty? The battery could be anything from a black box with leads to a plug/socket on the motherboard, to a plug in or soldered in nicad stack, usually somewhere near the back of the board by the keyboard socket. Usually they have a voltage written on them somewhere, though if your RTC module is small and on unpluggable red & black flying leads that could be it.

Cheers

Billy 8-{) 		Guest (0)
43252 2002-04-11 05:50:00 Guess 96 since thats what time it says, Pentium 166 G586IPC rev: A, which I found rev: 0 so loked at that manual and found where the RTC was but thats it?

I took out all IDE cables to look closely at it, but no obvious blue size of AA or any thing that has leads from it?

Should I tell him to get a new m/b? 		Guest (0)
43253 2002-04-11 11:22:00 Peter Cox found the ODIN site for you which gives an equivalent Dallas clock chip number. If it's soldered in then there's no show of changing it (well, hardly).
If its socketed then you may be able to get a replacement.

They are a pain in the bum! Because some of these fail after just a few years, nowhere near the 10 that is claimed. They were used for cheapness I think. 		Guest (0)
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