LG LFXS29766 Series Service Manual page 86

B5. LED blinks six times, then repeats (Current Trip: A & E-Inverters)
Blink Blink Blink Blink Blink Blink
- Purpose: Prevent over-current (overload protect)
- Cause: Ambient temperature is high (over 43°C) and/or refrigerator's condenser air movement is restricted.
- Condenser Fan is stopped, restricted discharge line, compressor is damaged, or IPM device is defective.
- Logic: Compressor is forced off and tries to restart after 6 minutes.
Protection
logic
Check B
N
Repeat
Check Procedure
B6. LED blinks seven times, then repeats
Blink Blink Blink Blink Blink Blink Blink OFF
- Purpose: Prevent high current due to IPM Short
- Cause: Damaged IPM (Dead Short)
- Test for a dead short at Point A with a VOM.
- Logic: Compressor is forced off and tries to restart in 20 seconds.
Protection
Blink 7 times
logic
(Lock Piston Trip) Check B5
Check B
Compressor
Doesn't work
OFF
Blink 6 time
(Current Trip) Check B5
Replace
Driver PCB
Current trip
occur?
Y
Compressor
Doesn't works
Y
Check IPM
visual inspection
(turn off)
Modify
N
Power
Reset
Compressor
Intermittently
works
N
N
IPM Check
Y
Compressor
Damage
Check
Y
Reset
Power
Y
Cycle blockage?
N
Cycle check
Short
N
Test
Point A
Y
Compressor Y Check Procedure
Damage
Check C3
NG
- 86 -
Protection Logic
Y
N
Replace
Compressor
N
Replace
Compressor
Y
Sealed System
Repair
Protection Logic
A
Replace
Drive PCB
Repeat
Replace
Compressor