How to Use a Multimeter to Diagnose Mainboard Failures of Internal and External Machines

How to use a multimeter to test the inverter air conditioner to determine whether the main board of the internal or external unit is faulty?

To measure the mainboard failure of the internal and external units of the inverter air conditioner, you can judge it through the following steps

1. First, adjust the multimeter to the resistance measurement range.

2. Connect one test pen to the ground wire on the internal machine mainboard, and connect the other test pen to the pins of each circuit component on the internal machine mainboard, and record each pin. resistance value.

3. Repeat the above steps, connect the test pen to the ground wire on the main board of the external machine, and connect it to the pins of each circuit component on the main board of the external machine, and record the resistance value of each pin. .

4. Compare the resistance values ​​of the same component pins on the internal and external motherboards. If there is a significant difference, it may indicate that the component is faulty on one of the motherboards.

5. In addition, the fault can also be determined by measuring the voltage value on the motherboard. Set the multimeter to the voltage measurement range, connect the test pen to the power pin or other key pin on the motherboard, and measure whether the voltage value is normal.

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