1. Resistance detection method: adjust the multimeter to the resistance range, detect the resistance value to ground of a certain point on a normal circuit board, and then test the same point on another identical circuit board to see if the resistance value is different from the normal one. If they are different, the scope of the problem is determined.
2. Voltage detection method: adjust the multimeter to the voltage range, detect the voltage to ground at a certain point in the circuit suspected of having problems, and compare whether it is similar to the normal value. Otherwise, determine the scope of the problem.
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