主板不上电的故障，在日常维修中比较常见，其实从我的维修经验上来说，不上电的故障是最好修的，只是大家在维修过程中没有掌握正确的维修流程，所以思路也就不正确，在这里向大家作一个关于主板不上电维修的流程的大致介绍，希望对大家维修此类主板时有所帮助！
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1.??????????????????????????I/O???MOS????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
2.?????PCB????????????????????????????????????????????????????????
????ATX??????
?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
1.??ATX????3.3V?5V?5VSB?12V?????????????????????????100???????100?????????????????PS???????3.3V????????????100???????100??????????????????????????????????????????????????????????????????????????????
2.??4PIN??ATX????12V???????????12V??ATX??12V????????????????12V??????CPU???????????12V???????????CPU?PWM?????MOS???????????????????????????????????????????G?S??D?S?????????????????????????????????????????????????????????????????????????
3.????????????????MOS??S???????????????VCC_DDR?AGP??VDDQ???????????????????
4.??????3VSB?1.5VSB?1.2VSB??????????????????3VSB????????????????????????????????????????????????????????????????????????????????3VSB?????????????????????3VSB?????????
????ATX??????
??ATX???????????????????????????????????????????????????????揚ower Sequencing--???????????????????????????????????????????????????揚ower Sequencing????????????????????????????????????????????????????????????
???????Power Sequencing????????????RTCRST#-VSB????-RTCRST#-SLP_S3#-PSON#????Power Sequencing???????????????????????????????????????????????????Power Sequencing??????
1.????ATX??????????????VBAT???CMOS????RTCRST#??????RCTRST#?????????????????????????ATX?????????????CMOS??????2.5V-3V????
2.?????????32.768KHz????????nFORCE????????????25MHz????????
3.??ATX???????5VSB?3VSB?1.8VSB?1.5VSB?1.2VSB???????????????5VSB?3VSB??????????????????????????????????????????????????DATASHEET?????
4.??RSMRST#?????3.3V?????RSMRST#?????????5VSB?3VSB?????????????????????????????????????????OK????????????????RSMRST#???I/O??????????????????RSMRST#???????????RSMRST#?????????RSMRST#??????????????????????????I/O???????RMSRST#??????
5.?????????SUSCLK??32KHz????
6.???????????????PWBTN#???I/O?I/O???????????????????PWBTIN#?????
7.????PWBTIN#??????SLP_S3#?I/O?I/O?????????????????PSON#???ATX???ATX????????PSON#??????????????????????????????????
PS????INTEL?????????VIA?SIS????????????????I/O?????????????????????PWBTN#????????SUSB#??SLP_S3#??????????B????????C??ATX???PSON???E??GND?SUSB#??????????C?E?????PSON#??????????????????MOS?????????????????SUSB#??PSON????????????????
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