Three main points of the motherboard repair

1, non-maintenance of electricity
1, Southbridge (electricity) 1, Southbridge (electricity)
2, I / O (power supply) 2, I / O (Power)
3, the door circuit (VCC) 3, the door circuit (VCC)
4, XY (both ends voltage) 4, XY (both ends voltage)
5, COMS battery 5, COMS battery
6, Jump (jumper cap) 2.5V-3.3V 6, Jump (jumper cap) 2.5V-3.3V
7, Power-on is not level transistor 5V 7, Power-on is not level transistor 5V
8, 5VSB 8, 5VSB
9, power-on 9, power-on
Second, no reset of maintenance Second, no reset of maintenance
1, check the clock chip's power supply 3.3-2.5V, inductor or greater than the amount of around 0 Ohm resistor. 1, check the clock chip's power supply 3.3-2.5V, inductor or greater than the amount of around 0 Ohm resistor.
2, the amount of 14.318 crystal work is normal, in turn, the amount of two feet, voltage 1.5-1.6V. 2, the amount of 14.318 crystal work is normal, in turn, the amount of two feet, voltage 1.5-1.6V.
3, Power-ok there is no 5V voltage, if not, check the circuit along the line. 3, Power-ok there is no 5V voltage, if not, check the circuit along the line.
4, the amount of South Bridge, the clock signal is normal, the amount of 330,220,110 next to the voltage 1.6V. 4, the amount of South Bridge, the clock signal is normal, the amount of 330,220,110 next to the voltage 1.6V.
5, Southbridge power supply to normal, the amount of MOS, 1117 have 3.3 or 5V supply. 5, Southbridge power supply to normal, the amount of MOS, 1117 have 3.3 or 5V supply.
6, the amount of 32.768 crystal is normal intel 0.5V VIA 1.5V. 6, the amount of 32.768 crystal is normal intel 0.5V VIA 1.5V.
7, the amount of reset switch on the voltage is 3.3V or 5V, if there is no voltage, check along the switching line, generally leads to two gates, or gate leading to a foot, another foot leading to gate. 7, the amount of reset switch on the voltage is 3.3V or 5V, if there is no voltage, check along the switching line, generally leads to two gates, or gate leading to a foot, another foot leading to gate.
8, detection gate voltage of 3.3V-5V. 8, detection gate voltage of 3.3V-5V.
9, the amount of PCI, AGB, IDE, I / O reset pin to ground are not shorted. 9, the amount of PCI, AGB, IDE, I / O reset pin to ground are not shorted.
10, the amount of Vcore are normal. 10, the amount of Vcore are normal.
11, the amount of ATX Power Supply 3.3V, 12V, 5V are normal. 11, the amount of ATX Power Supply 3.3V, 12V, 5V are normal.
3, FF maintenance 3, FF maintenance
1, in the voltage of each group under normal circumstances, the amount of each bus-to-ground resistance. 1, in the voltage of each group under normal circumstances, the amount of each bus-to-ground resistance.
2, CPU to the North bridge 32 address lines, 64 data lines to-ground resistance 350-750. 2, CPU to the North bridge 32 address lines, 64 data lines to-ground resistance 350-750.
3, South Bridge to the North Bridge-to-ground resistance 350-750. 3, South Bridge to the North Bridge-to-ground resistance 350-750.
4, South Bridge to the AD line of PCI-to-ground resistance should be the same. 4, South Bridge to the AD line of PCI-to-ground resistance should be the same.
5, the amount of BIOS, clock, reset, AD line. 5, the amount of BIOS, clock, reset, AD line.
6, brush BIOS. 6, brush BIOS.
7, the clock IC power supply. 7, the clock IC power supply.8, memory, power supply. 8, memory, 8, memory, power supply. 8, memory, power supply.