LG LKIM08121V /00 Service Manual page 32

Compressor
7-2 Judging Defects in Inverter BLDC Compressor
To check for BLDC compressor defects, perform checks in the following order.
7-2-1 Measuring the Compressor Winding Resistance
Caution
1. Turn off the power to the refrigerator and wait a few minutes before measuring.
2. If you do not accurately measure the resistance, it can be determined incorrectly.
Normal Criteria
• When measuring the resistance value of the Harness (connected to the Compressor) connecting to
the Main PWB's Connect201 (CON201) using a Multi-tester, the resistance value can be determined
as having returned to normal when the displayed value matches the one in the drawing on Page 31.
Defect Criteria
• If the resistance value measured at the Fig. A is infinity or hundreds of MΩ, check the clamping state
of the Compressor connection Harness-P (Lead Wire) in the machine room and separate the
machine room Connect (Fig. point B) and re-measure the resistance in Connect. If the resistance
value matches the standard value, the Compressor can be deemed as normal. Check the Harness
connection
(Machine room Connect contact defect, CON201 Housing Connect Defect, Harness disconnection.)
• If the resistance value measured in Fig. B is also infinity or hundreds of MΩ, turn off the Compressor
terminal's Cover PTC and check the status of Fig. point B's terminal bond. If it is normal, check the
contact state of O.L.P. that is fixed in the Cover PTC. O.L.P abnormalities can also be determined
by the resistance values of both O.L.P. ends. If the resistance value is less than 5Ω when measuring
both O.L.P ends, it is normal If the resistance value is large, an O.L.P. short can be determined,
power is not supplied to the Compressor and it doesn't not run.
• If there is no problem with the connection state and the resistance value is infinity or hundreds of
MΩ, Compressor failure can be determined.
• If there is no problem with the Compressor's resistance value, there could be a Main PWB defect.
Check for PCB failure.
• When you determine there is a defect by measuring the resistance, if the PCB's COM201's MU &
MV or MU & MW or MW & MU resistance value matches the value of page 31, motor winding can
be determined as normal
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