LG CT09F Service Manual page 115

Part 4 Trouble Shooting
6.7 Troubleshooting Outdoor Error
CH 27/73 (PSC/PFC Fault Error)
Checking Discrete PFC part
Checking Discrete PFC
Purpose
parts for fault
■ How to check IGBT, FRD (Diode Mode)
1. Remove the connector from PCB.
2. Set the Multi-Tester as Diode Voltage Measurement Mode. (
3. Measure the voltage as shown in Fig. 1.
4. Measure the voltage as shown in Fig. 2.
5. If the measurements are significantly different from the levels shown in the figures, the IGBT, FRD is
deemed to be damaged.
IGBT
IGBT
FRD
< IGBT >
Sequence of
Measurement Measurement
1 C – E
2 C – E
❈ C : Collector / E : Emitter
Items for checking
E
C
E
C
A
C
A
Normal Sequence of
Measurement Measurement
Standards
0.3 V~0.5 V
0.3 V~0.5 V
❈ A : Anode / C : Cathode
- 115 -
1. Checking IGBT for damage
2. Checking FRD for damage
)
< FRD >
1 A – C 0.3 V~0.5 V
2 A – C 0.3 V~0.5 V
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Normal
Standards