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All-in-one press the switch not to display.
The fault of this all-in-one machine is that it is not displayed by pressing the switch.
We started maintenance.
Step 1, plug in the keyboard to see if the keyboard size light is controlled. If the keyboard switch light is controlled, it means that the motherboard has been working normally, so we can narrow down the fault and it should be on the display screen or display circuit.
Step 2, after we disassemble the machine, the external display screen is still not displayed, and it is determined that it is a display circuit problem, not a screen problem.
Step 3. Measure the working conditions of the driving plate after disassembling the machine. Through measurement, it is found that all the power supply of the driving board of the display screen is normal, which is determined to be a program problem.
Step 4, we brush the program of the driver board, and test that the screen display is normal again, and the fault repair is completed.
