LG LFX28978 series Service Manual page 61

B5. LED blinks seven times, then repeats (IPM Fault: A & E Inverters)
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 2.5 minutes.
Protection
logic
(Lock Piston Trip) Check B5
Check B
Blink 7 times
Y
Check IPM
Compressor
visual inspection
Doesn't work
(turn off)
Modify
N
Power
Reset
- 61 -
Short
N
Test
Point A
Y
Compressor Y
Damage
Check C3
NG
Protection Logic
A
Replace
Drive PCB
Repeat
Check Procedure
Replace
Compressor