What are the common maintenance techniques for industrial motherboards?

What are the common maintenance techniques for industrial motherboards?

With the rapid development of economy and technology in recent years, the computer hardware industry has gradually become richer and more optimized, and it has gradually been loved by thousands of households. However, the operation of the computer will inevitably require the participation of the motherboard. In the use of the industrial motherboard, the industrial motherboard will fail due to various reasons. At this time, the industrial motherboard needs to be overhauled first to accurately find out the problem of the industrial motherboard. What are the common maintenance methods for industrial motherboards? Today, Shen Zhen ZeChuang Weiye Technology Co.,Ltd will learn 5 techniques for overhauling industrial motherboards with everyone:

1. Program testing method: This method is mainly used to check whether various interface circuits and various circuits with address parameters are faulty. The principle is to use software to send data and commands, and read the line status and a certain chip (such as a register). ) Status to identify the fault location.

2. Check if there is a short circuit on the industrial main board: Before powering up, measure whether there is a short circuit on the industrial main board to avoid accidents. The judgment method is: measure the resistance between the power pin of the chip and the ground. When the power plug is not inserted, the resistance should generally be 300Ω, and the minimum should not be less than 100Ω. Measure the reverse resistance value again, there is a slight difference, but the difference should not be too large. If the forward and reverse resistance valuesare small or close to conduction, it means that the industrial motherboard has a short circuit. The cause of the short circuit of the industrial mainboard may be damaged resistors and capacitors, or conductive debris on the industrial mainboard, or a breakdown chip on the industrial mainboard. To find out which chip has broken down, you can plug in the power supply and power up the measurement. Generally measure the +5V and +12V of the power supply. When you find that a certain voltage value deviates too far from the standard, you can use the separation method or cut some leads, or unplug some chips and measure the voltage again. When a certain lead is cut or a certain chip is unplugged, if the voltage becomes normal, the component or the unplugged chip led by this lead is the fault.

3. Dust removal method: The area ofthe industrial motherboard is large, and it is a place where there is more dust. Dust can easily cause poor contact between the slot and the board. In addition, some plug-in cards and chips on industrial motherboards are in the form of pins, and they often have poor contact due to oxidation of the pins. It is recommended to use a wool brush to gently brush away the dust on the industrial motherboard. Be careful not to use too much force or move too hard, so as not to touch the chip components on the surface of the industrial motherboard or cause the components to loosen and cause false soldering. Pay attention to clear the dust on the thermistor used to detect the CPU temperature in the CPU slot or the thermistor used to monitor the temperature in the chassis on the industrial motherboard, otherwise it will cause the industrial motherboard to recognize the temperature incorrectly, which will cause the industrial motherboard to protect the fault. If the socket pins are oxidized and cause poor contact, you can fold the hard white paper (the surface with a smooth surface is facing outward) and insert it into the slot to wipe it back and forth; for the card pins, you can use an eraser to remove the surface oxide layer, and then reinsert it. Pick up.

Fourth, the plug-in exchange method: first shut down, and then pull out the plug-in boards one by one; each time a board is pulled out, turn on the machine to observe the operating status of the machine. Once a certain board is pulled out, the industrial mainboard is operating normally, then the plug-in board is faulty , Or the corresponding I/O bus slot and load circuit are faulty; if the system does not start normally after pulling out all the plug-in boards, the fault is likely to be on the industrial main board.