LG LFX28968SW Service Manual - Page 59

B5. LED blinks seven times, then repeats IPM Fault

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B5. LED blinks seven times, then repeats (IPM Fault) 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 Logic A Protection logic Check B Blink 7 times (Lock Piston Trip) Check B5 Compressor Doesn't work N Y Check IPM visual inspection (turn off) Modify Short Test Point A Y Power Reset Compressor Damage Check C3 Y NG N Replace Drive PCB Repeat Check Procedure Replace Compressor - 59 -

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- 59 -
B5. LED blinks seven times, then repeats (IPM Fault)
Protection Logic
Blink
Blink
Blink
Blink Blink Blink Blink OFF
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
-
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.
A