Detection method and sequence of industrial computer failure not starting:
1. Check the three major operating conditions of the CPU
Power supply
clock
reposition
2. Remove the BIOS and check whether the 22-pin chip selection signal has jumped
3. Try changing the BIOS and check the line connected to the BIOS
4. Check the data line, address line (and AD) on the ISA and PCI, and the control line such as abort (which can directly reflect the problem of the north and south bridges)
5. Check the ground resistance of APP, PCI, CPU to determine whether the north bridge is normal
(1) Power supply CPU core voltage
(1) No voltage
A. The FET is broken, open circuit or short circuit
B. Short circuit of filter capacitor (electrolytic capacitor)
C. There is no output of voltage IC
There is no 12V power supply
The voltage IC is bad
Breaking
(2) Low voltage
A. There is a slight short circuit in the circuit related to the CPU operation voltage
B. If the FET is broken, the output voltage will also be lower
(3) High voltage
C. The feedback circuit has no effect
D. The output voltage of the voltage IC is low
(b) VID0-4 (+5V voltage)
There is no output for the voltage IC
The exclusion that is connected to the CPU socket is broken
Breaking
(c) VTT1.5V
(1) No voltage
The power supply FET is broken
VTT1.5V has a short circuit to ground
(2) Voltage level
The power supply of the MOSFET is abnormal
The MOSFET is bad
(4) Clocks
(1) No clock
An open circuit between the CPU socket and the clock IC
The clock IC has no output
Bad filter capacitance for connection with output (10 picos)
(2) The clock IC has no output
Whether the power supply is normal: 3.3V, 2.8V, 2.5V
No output at all or no output at half
Whether the crystal oscillator vibrates 22 or not, whether the skin method is bad
(3) There is no output at all
There is power supply, and the IC is bad
If there is no power supply, check the power supply related lines
(4) Half of it has no output
IC is bad
Check the abnormal half of the power supply
(5) Reset
(1) No reset 1.5V
A. Low reset voltage: North Bridge is bad
B. There is voltage but no reset
False weld on the north bridge or no reset on the north bridge
The line to the North Bridge is disconnected
(2) There is no reset on the north bridge (see if PCI, AGP, IDE are normal)
There is a reset: the line is broken from the north bridge
No Reset: Check the circuit where the reset occurs
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