Compressor Troubleshooting - LG LFX28978 series Service Manual

12. Compressor Troubleshooting

PCB Check (Simplify)
A-inverter
Power Off
Disconnect
Test Mode
Ref.
TEST1 Forced Starting
Troubleshooting
Recheck
Reset
Y
LED
Not
Blink?
Cooling
N
Check C
Heavy Repair
Con202
Power On
Comp
FC75(A-Inverter)
TDC (Full Stroke)
LED blink 1 Reset
LED blink 7 Reset
LED blink 5 Reset
Heavy Repair
LED blink2 Reset
Heavy Repair
LED blink6 Reset
Comp.
Work?
Y
Y
Refrigerant
leak ?
TEST 1 Mode
Time>30sec
& V°÷200
N
Replace Driver PCB
Display & sound
Display ON, Buzz 1 time
LED blink 1
Comp.
Check?
LED blink 7
N
Comp.
N
LED blink 5
Work?
Y
Y
Leakage?
Comp.
LED blink2
Work?
Y
Y
Refrigerant
leak?
Comp.
LED blink6
Work?
Y
Y
Heavy Repair Leakage?
IPM output
N
>
80V-20%
Y
N
Recheck
- 56 -
Protection Logic
Y
PCB OK
Check Voltage about 200V
past 30second after turn on
Refer
Replace Driver PCB
Y
Replace Driver PCB
N
Comp.
Replace Comp.
Check?
N
Recheck
Comp.
N Harness Y
Check?
Check?
N
Fix Harness
N
Recheck
N
Comp. N
Check?
N
Recheck
N
Replace Driver PCB
N
Comp.
Check?
N