The POS machine has a problem: 1. After the power is turned on, the display has no performance. Analysis of the problem: From the starting sequence of the motherboard analysis, when the power supply is malformed, a "POWERGOOD" signal will be sent to the CPU. When the CPU receives this signal, it will start the POST initiative. The important obligation of POST is to detect Whether some of the crux equipment in the system can exist and whether it can be deformed, such as memory and graphics cards, if there is a problem in this process, there will be no performance problems. Spreading parts: power supply, motherboard, CPU, memory, graphics card.
1) Minimize the hardware of the system, save only the motherboard and power supply, pass the process line ClearCmos, power on, if the motherboard speaker can recover the alarm sound without memory, the gold finger of the memory is cleaned with a rubber plaque and then plugged in and tested; Performance, performance processing, if there is no performance, replace the memory and then test.
2) After following the previous step, after the power is turned on, the main board speaker has no alarm sound, and the replacement method is used to replace the power supply, and the main board detects the location of the faulty part.
Fault scene: 2, after power-on, you need to expect performance after a period of time.
Analysis of the problem: After power-on, the boot time is longer than the deformed time. It is probably the capacitance on the motherboard or the capacitance in the power supply causes the leakage to cause a variable value, which makes the charging time lead to a longer start-up time.
Spreading parts: main board, power supply
1) Inspect the capacitor on the main board by inspection. If the capacitor is rising or leaking, you need to change the capacitor or the main board.
2) Using the replacement method, change the power supply and the motherboard stops testing.
Fault scene 3, the application process often unreasonably restarts the fault analysis: because the capacitance value, the system is not stable, the virus is probably causing the active restart without any reason. Spreading parts: power supply, main board, system
1) First check whether the power supply and the capacitance of the main board can rise or leak. If there is such a situation, first change the capacitor or respond to the component before stopping the test.
2) Use the replacement method to change the power supply and the motherboard and stop testing.
3) After operating the system from the new device, test without loading any drivers or software. Then gradually drive the drive sequence and application software testing.
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