LG LRFCS25D3 Series Service Manual page 45

11-1 Check B
B1. LED blinks once, then repeats (FCT0 Fault: A-Inverter)
Blink OFF Blink OFF
- Purpose: Detecting motor current and voltage error
- Check voltage at point A (Motor Voltage), point B (Motor Current) and Point C (Capacitor
Voltage) when compressor is off.
- Spec: Points A, B, & C 2.5V 0.3V
Protection
logic
Check B
Caution : Devices s
circuited during check C
B2. LED blinks two times, then repeats (Stroke Trip)
Blink Blink OFF Blink Blink OFF
- Purpose: Prevent abnormally long piston strokes.
- Case 1. If compressor doesn't work and LED blinks - Cause: Possibly harness from compressor to PCB might be defective.
- Case 2. If compressor works intermittently and LED blinks - Cause: Condenser Fan or Freezer Fan is not running. Sealed
system problem such as moisture restriction, restriction at capillary tube or refrigerant leak.
- Logic: Compressor is forced to off and then tries to restart after 1 minute.
Protection
logic
(Stroke Trip) Check B2
Check B
Replace
Driver PCB
OK
Fix
NG
Cycle
Repeat
check procedure
Blink 1 time
(FCT 0) Check
B1
Out of spec?
(2.2 - 2.8V)
N
Reset Power
hould not be short-
Blink 2 times
Y
Compressor
doesn't work
Compressor
N
intermittently
Cycle
Y
Check E
Stroke trip
N
occur?
Replace Driver
Y
PCB
N
Fix Harness
Harness
Connecting
Check C
Y
works
Reset
power
45
Protection Logic
GND
C
Capacitor
N Replace
spec.
capacitor
Check C
Y
Compressor
N Replace
Damage
compressor
Check C
Y
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B
A