1, check the three working conditions of the CPU
powered by
clock
Reset
2. Remove the BIOS and check if the 22-pin chip select signal has a transition.
3. Try changing the BIOS and check the line connected to the BIOS.
4, check ISA, PCI data lines, address lines (and AD), interrupts and other control lines (this can directly reflect the North and South Bridge problems)
5, check AGP, PCI, CPU block ground resistance to determine whether the North Bridge is normal
(A), power supply CPU core voltage
(1) no voltage
A, FET is broken, open or shorted
B, filter capacitor short circuit (electrolytic capacitor)
C, voltage IC has no output
No 12V power supply
Voltage IC is bad
Broken line
(2) low voltage
A, the CPU operating voltage related line has a slight short circuit
B, the FET is broken, and the output voltage is also low.
(3) High voltage
C, the feedback circuit has no effect
D, voltage IC output voltage is low
(2) VID0-4 (+5V voltage)
Voltage IC has no output
The exclusion resistance connected to the CPU base is bad
Broken line
(3) VTT 1.5V
(1) no voltage
Power supply field effect tube is broken
VTT1.5V has short circuit to ground
(2) Voltage level
FET power supply is not normal
Field effect tube is broken
(four) clock
(1) No clock
Open circuit between CPU socket and clock IC
Clock IC no output
Bad filter capacitor connected to the output (10 picofarads)
(2) Clock IC has no output
Is the power supply normal? 3.3V 2.8V 2.5V
All no output or half no output
Whether the crystal oscillator starts to vibrate 22 or not
(3) No output at all
Powered, IC is bad
No power supply, check the power supply related lines
(4) half of the output
IC is bad
Check for abnormal half of the power supply
(5) Reset
(1) No reset 1.5V
A, the reset voltage is low: the north bridge is broken
B, there is no voltage reset
North Bridge false welding or North Bridge without reset
The line connected to the North Bridge is disconnected
(2) Northbridge has no reset (see whether PCI, AGP, IDE are normal)
Reset: break line with North Bridge
No reset: check the reset generation circuit
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