Problem description: computer every time becomes 2000.1.1 time run on electricity, namely CMOS time be refreshed, doubt is lithium batteries, but the multimeter played is the standard 3 v, batteries, it's no use discharge,

Main confusion: the BIOS Settings, modify the startup for hard disk boot (BIOS default is network card), F10 preserved after the restart time is reset, but not into the default startup, but keep the change,
Under the Windows XP setup time, restart the computer directly into the BIOS found no reset time, but what did not move, exit into the BIOS, again time to reset, other modifications did not change,

For restart is not shut down, so the cmos without button batteries, can save the time pass, but as long as the need of button batteries, time will be reset, but other BIOS Settings did not change, so that no problem cmos power supply circuit, otherwise the BIOS should all become a default value,

Suspected: there is something wrong with the RTC circuit, it is able to work under an external power supply, but the battery failure, but don't know if this problem, and don't know how to detect, don't even know cmos in which position, because there is no circuit button next to the battery, may be integrated to the occurrence of the inside,

Hope leaders help give a solution, very grateful,

Server is SOM - 4486 fl board, the occurrence of the single chip NH82801GB, the BIOS is the phoenix b2.0 version,

CodePudding user response:

Battery exists leakage when the battery run out soon after the blackout, 3 v is wrong, generally between 3.3 3.7, if less than 3.2 is unstable or "reset"
Nominal 3 v battery is 3.6 v actually!!!!!!

CodePudding user response:

reference 1st floor Glen_hsu response:

battery exists leakage, when the battery run out soon after the blackout, 3 v is wrong, generally between 3.3 3.7, if less than 3.2 is unstable or "reset"
Nominal 3 v battery is 3.6 v actually!!!!!!

Power battery without leakage, after measuring output pin, found that keep about 3 v