Check B; Led Blinks Once, Then Repeats (Fct0 Fault: A-Inverter); Led Blinks Two Times, Then Repeats (Stroke Trip); Protection Logic - LG LFXS24623S Service Manual

12-1 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
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
(Stroke Trip) Check B2
Y
Compressor
doesn't work
N
Cycle
Y
Check E
Stroke trip
N
occur?
Replace Driver
Y
PCB
N
Fix Harness
Y
Harness
Connecting
Check C
Compressor
Y
works
intermittently
Reset
power

Protection Logic

GND
C
Capacitor
N Replace
spec.
capacitor
Check C
Y
Compressor
N Replace
Damage
compressor
Check C
Y
B
A