1. ATX power supply without plugging before the battery on the motherboard generated by the VBAT voltage and CMOS jumper on the RTCRST # to supply South Bridge, RCTRST # South Bridge used to reset the internal logic, we should first be inserted in the absence Prior to the measurement on the ATX power supply is an electric battery, CMOS jumper on whether there is 2.5V-3V voltage.

2. Check whether the output of the 32.768KHz oscillator frequency to the Southbridge (in nFORCE chipset motherboards, but also whether the measurement from 25MHz crystal oscillator)

3. Plug ATX power supply, check 5VSB, 3VSB, 1.8VSB, 1.5VSB, 1.2VSB machine voltage is normal to wait for the conversion out of (5VSB and 3VSB standby voltage of each block must have a motherboard, the other standby voltage of are made based on the different motherboard chipset is different, and specifically refer to the relevant chipsets DATASHEET in the introduction)

4. RSMRST # Check whether the signal 3.3V’s high, RSMRST # signal is used to notify the South Bridge 5VSB and 3VSB a normal standby voltage signal, this signal if it is low, then the Southbridge receive an error message that the corresponding The standby voltage is not OK, so it will not proceed with further action on the power. RSMRST # in I / O, integrated components, such as on the card to be measured, in addition to measuring RSMRST # signal voltage, but also the measurement RSMRST # signal-to-ground resistance, if the RSMRST # signal will not work in the short-circuit condition is The actual repair, the multiple fault is I / O or network card caused by bad RMSRST # signal is not normal.

5. Check Southbridge whether to issue a SUSCLK the 32KHz frequency.

6. Shorted the power switch on the motherboard, issue a PWBTN # signal to the I / O, I / O to receive this signal, after a deal with the issue an internal logic to the PWBTIN # to the South Bridge.

7. Southbridge received PWBTIN # signal issued SLP_S3 # to the I / O, I / O receives the signal through the internal logic of deal with the issue PSON # signal to the ATX power supply,

ATX power supply received a low level of the PSON # signal and begins to work, to issue separate ways the basic voltage to the various components on the motherboard to complete the power-on process.