LG CT09F Service Manual page 148

6.7 Troubleshooting Outdoor Error
CH 67 (Fan Lock)
Fan IPM Check
Judgment of the Fan IPM part
Purpose
fault of PCB assembly.
■ How to check Fan IPM IGBT (Diode Mode)
1. Remove the connector from PCB.
2. Set the Multi-Tester as Diode Voltage Measurement Mode. (
3. Measure the voltages of P~U / P~V / P~W as shown in Fig. 1.
4. Measure the voltages of U~Nu / V~Nv / W~Nw as shown in Fig. 2.
5. If the measurements are significantly different from the levels shown in the figures, the IPM is deemed to
be damaged.
Items for checking
0.35 V~0.55 V
0.35 V~0.55 V
0.35 V~0.55 V
0.35 V~0.55 V
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Part 4 Trouble Shooting
1. Judgment of damage of IGBT
2. Checking the soldering state
)
0.35 V~0.55 V
0.35 V~0.55 V
0.35 V~0.55 V
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0.35 V~0.55 V