LG LMXC23746S - LED Blinks Seven Times, then Repeats; LED Blinks Eight Times, then Repeats (Communication Error)

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B6. LED blinks seven times, then repeats
FFOknilBknilBknilBknilBknilBknilBknilB
Protection
logic
Check B
Blink 7 times
(Lock Piston Trip) Check B5
Compressor
Doesn’t work
Y
N
Repeat
Check Procedure
Replace
Drive PCB
N
Y
Check IPM
visual inspection
(turn off)
Short
Test
Point A
Power
Reset
Compressor
Damage
Check C3
Replace
Compressor
NG
Y
Modify
A
B7.LED Blinks eight times, then repeats (Communication Error)
FFOBlink Blink knilBknilBknilBknilBknilBknilB
Protection
logic
Check
blink 8 times
(Communication Error)check B7
Check Comp. Starting
when C-fan doesn’t work
Y
N
Reset
Power
1. Check Temp. &
Sound Pressu re of
Comp and D-pipe
2. Check whether or
not C-Fan Works
Replace Driver PCB
Repeat
Check Procedure
- 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 20seconds.
- Purpose : To detecte Set control Micom and communication error
- Cause : Communication Error
- Logic : LED blink. (Compressor runs reference value before occuring communication Error)