Detection method of industrial computer failure without booting - EVOC

Create Date: 2024-8-30 12:03:23|Source: EVOC/EVOC

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

                               Detection method of industrial computer failure without booting - EVOC

(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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