CMOS checksum error:atrend ATC6254 BX

kengi · Sat Oct 26, 2002 8:40 am

mainboard atrend ATC6254 BX :I want mainboard mannual.And I recieved displays a "CMOS checksum error" or a similar message.Help me!

Sat Oct 26, 2002 1:31 pm

Manual: ftp://ftp.univ-lille1.fr/pub/vendor/atr ... /6254m.zip

Sudden CMOS checksum error is caused by low or completely dead CMOS backup battery (usually standard CR2032 on all newer boards).

dave clark · Mon Jan 20, 2003 2:42 pm

Hi...
I had a similar problem on an ABIT SH6 board.

I replaced the battery, had the BIOS chip re-programmed, still got same problem.

Even after "clear CMOS" and several restart attempts, it still reports "CMOS Checksum Error".

Am I right in thinking that the 'CMOS' chip is in fact the Electrically Eraseable Programmable Logic Device (ATMEL ATF 16V8C) at location U24 adjacent to the BIOS chip?

This is a surface mounted PLCC package with five pins on each side.

It is feasible with care and a steady hand to swap this chip.

I'd be interested in any feedback on this.

Regards...
Dave Clark

Mon Jan 20, 2003 3:30 pm

@Dave: you broke the rules. Don't post twice on the same problem. See my reply on the other thread.

dave clark · Mon Jan 20, 2003 10:27 pm

Sorry Nick. I thought I was "replying" to a thread that was already cross posted, albeit by two separate people.
FWIW I didn't actually post the identical reply in each thread.
Regards...
Dave

Tue Jan 21, 2003 11:02 am

Understood; but it would have been better to start a new post for your particular problem.