Compressor - LG LTCS24223B/05 Service Manual

5. COMPRESSOR

1.How to find out Inverter BLDC Compressor defect
If Inverter BLDC Compressor defect occurs, you can check in the following order.
1-1. How to measure Compressor winding resistance
Standard for judging normality
When the resistance value of Harness(connected to Compressor) connecting Main PWB Connect201(CON201), if the
resistance value shows the value of the level in the following figure, you can say that it is normal.
Standard for judging defect
If the resistance value measured in point A in the figure shows infinity or several hundred , check the locking status of
Compressor connecting Harness-P(Lead Wire) in the machine room, separate machine room Connect(B point in the figure),
and measure resistance value of Connect again. If the resistance value shows the standard resistance value, Compressor can
be judged to be normal. Check Harness connection status.
(Machine Room Connect Contact Defect, CON201 Housing Contact Defect, Harness Disconnection) If the resistance value
measured at B point also shows infinity or several hundred , disassemble Cover PTC of the Compressor connector, and check
the locking status of the terminal at D point in the figure. If it is normal, check the contact status of O.L.P fixed inside Cover
PTC. The problem in O.L.P. may be judged by the resistance values at both ends of O.L.P. If both ends of O.L.P. are measured
and the resistance value shows 5 or less, it is normal. If the resistance value is big, it may be judged as O.L.P. disconnection,
and compressor does not operate because of no power supply.
If there is no problem in the connection status, and resistance value shows infinity or several hundred , it may be judged as
Compressor defect.
If there is no problem with the resistance value of the Compressor, it may be Main PWB defect, so check
PCB defect.
During the judgment of defect through resistance measurement, if the resistance values of No.1 and No. 3 of CON201 show
the value in the level presented below, motor winding may be judged as normal.
Cautions
1. Make sure to turn off the power of the refrigerator, and measure after several minutes have passed.
2. If the resistance is not correctly measured, you may have wrong judgment.
(The resistance value may have differences of several )
Compressor
BMA069LAMV
There may be resistance value differences of
several according to the ambient temperature or
operation condition.
Motor resistance
Multi Tester
Multi
Tester
- 19 -
C OLP
Compressor terminal
U
D
V
B
Multi Tester
U
W
V
W