LG A2UN186FA0, Service Manual

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Does the operating LED in display PCB
Ass'y blink 9 times?
When compressor does not operate normally.
■
DC Peak Error(Error Code )
Trouble 7-3
YES
Is the connecting state of connectors in out-
door Sub. PCB Ass'y right?
(CN-UVW, CN-IPM, CN-Gate 1, CN-Gate 2)
• Electrical wiring diagram (Colors)
• Check the connecting state of connectors
in PCB Ass'y(Main/Sub)
• If CN-UWV is connected, the comprressor
can be operated a opposite direction.
NO
YES
Is the power module in Sub PCB Ass'y
right?
• Check the short P-N P-U, V, W, and N-U,
V, W of IPM and then collector, emiter of
IGBT
• Replace the Sub PCB Ass'y.
NO
YES
Is the voltage of CN-AC over than
AC170V?
Check the supplied voltage.
NO
YES
Is the voltage of CN-DC over than about
DC260V?
• Check CN-IPM connector(Pin No. 12)
• Replace the Sub PCB Ass'y.
NO
YES
Replace the PCB Ass'y.
• Main PCB Ass'y
• Sub PCB Ass'y
• Control Box Ass'y