真的不好意思，我也是不甚了了。我说一下我目前的理解，也向高手请教。照图纸的意思，这两个信号连接PCH的SMB模块，SMB的大概意思是What is System Management Bus?
The System Management Bus (SMB) is a two-wire interface through which simple power-related
chips can communicate with the rest of the system. It uses I2C as its backbone.
A system using SMB passes messages to and from devices instead of tripping individual control
lines. Removing the individual control lines reduces pin count. Accepting messages ensures
future expandability.
With System Management Bus, a device can provide manufacturer information, tell the system
what its model/part number is, save its state for a suspend event, report different types of errors,
accept control parameters, and return its status.
The System Management Bus may share the same host device and physical bus as ACCESS.bus
components provided that an appropriate electrical bridge is provided between the internal SMB
devices and external ACCESS.bus devices.
大致是说一种双线的接口，传输设备之间的状态信息，控制信号等。我猜想是PCH会将内部温度信息告知温控IC U3901（EMC2012），温控IC在接收PCH信号后，做出电压调整控制风扇转速。当这对信号出错，IC接收信号有误，做出误判，从而加速风扇，直至保护断电。既然温控IC各项电压都对，原机散热器堵死，我是怀疑HM57有问题，所以试换它，瞎摸瞎撞的，不值一提。只是给大家参考。抛砖引玉，期待高手的解答。作者: 船过水止333 时间: 2013-8-2 12:18
HM57?北桥？作者: 記憶殘缺 时间: 2013-8-2 14:01
HM57换PCH，不会准时掉电？
