Led Blinks Once, Then Repeats (Fct0 Fault); Led Blinks Two Times, Then Repeats (Stroke Trip) - LG LMXC23746S Service Manual

12-2 Check B
B1. LED blinks once, then repeats (FCT0 Fault)
Blink OFF Blink OF F
-Purpose: Detecting motor current and voltage error
-Check voltage at point A( Motor Voltage), point B( Motor Current) andP oint C (Capacitor
Voltage) when compressor is off.
- Spec: Points A, B, & C 2.5V
Protection
Blink 1 tim e
logic
(FCT 0) Check B1
Check B
Out of spec?
(2.2 - 2.8V)
N
Reset Power
B2. LED blinks two times, then repeats (Stroke Trip)
Blink Blink OFF Blink Blink OF F
-Purpose : Pre vent abnormally long pist on strokes.
-Case 1. If compresso r doesn't work and LED b links - Ca use: 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) C heck B 2
Check B
Replace
Driver PCB
OK
NG
Fix
Cycle Check E
Repeat
Check Procedure
0.3V
Y
Replace Driver P C B
※ Devices should not be short-circuited when you check C
Blink 2 times
Y
Compressor
Doesn't work
N
Works Intermitte ntly
Y
Cycle
N
Stroke Trip
Occur?
N
Fix Harness
Y
Harness
Connecting
Check C
Y
Compressor
Reset
Power
- 92 -
Protection Logic
B
GND
Protection Logic
Capacitor
N
Replace
Spec.
Capacitor
Check C
Y
Compressor
N
Replace
Damage
Compressor
Check C
Y
A
C