LG ACHH Series Manual page 38

The phenomena from main component failure
n 3 Phase bridge diode inspection method
Internal circuit diagram
R S
1. Wait until Comp PCB DC voltage gets discharged, after the main power switch off (10 min).
2. Pull out all the connector connected with Inverter PCB.
3. Set multi tester in diode mode.
4. Measured value should be 0.4~0.7V measuring as below table.
5. In case the measured value is different from the table, set multi tester to resistance mode and measure. If the
value is short (0 Ω) or Open (hundreds MΩ), the Inverter PCB needs to be replaced.
6. In case that bridge diode is damaged, check if the Inverter PCB needs be replaced.
Diode terminal
Tester terminal
R(~) : red(+)
S(~) : red(+)
T(~) : red(+)
R(~) : black(-)
S(~) : black(-)
T(~) : black(-)
] Red(+) and black(-) are the measuring terminals of multi tester.
CAUTION
• Check the electric parts of c/box, 10 minutes after switching off the main supply and checking DC
voltage is discharged. Otherwise, there is chance of getting electric shock.
• There is chance of electric shock by charged voltage.
T
+ terminal: black(-)
0.4 V ~ 0.7 V
0.4 V ~ 0.7 V
0.4 V ~ 0.7 V
-
-
-
Appearance
- terminal: red(+)
-
-
-
0.4 V ~ 0.7 V
0.4 V ~ 0.7 V
0.4 V ~ 0.7 V
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R
S
T