LG LSC121PMA Service Manual - Page 44

The product is not operate with the remote controller.

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3. The product is not operate with the remote controller. Turn on Main Power While the compressor has been stopped, the compressor does not operate owing to the delaying function for 3 minutes after stopped. When the compressor stopped Indoor Fan is driven by a low speed. At this point the wind speed is not controlled by the remote controller. (When operated in the Sleeping Mode, the wind speed is set to the low speed by force.) Cause by the remote controller Caused by other parts except the remote controller When the mark( ) is displayed in LCD screen, replace battery. Check the contact of CN-DISP connector. When the detect switch(double key) inside the remote controller door is fault, it is impossible to operate temperature regulating( / ) and wind speed selecting. Check DISP PWB Ass'y - Voltage between CN DISP - : DC +5V Check the connecting circuit between the remote controller MICOM (No. ) - R17(2Ω) - IR LED - Q1 - R16(2.2KΩ). Check point • Check the connecting circuit between PIN - R75(1K) - C71(1000PF) - MICOM PIN • Check Receiver Ass'y - 44 -

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- 44 -
3. The product is not operate with the remote controller.
Turn on Main Power
While the compressor has been stopped, the compressor does not
operate owing to the delaying function for 3 minutes after stopped.
Caused by other parts except the remote controller
Cause by the remote controller
When the mark(
) is displayed in LCD screen, replace
battery.
Check the contact of CN-DISP connector.
When the compressor stopped Indoor Fan is driven by a low speed.
At this point the wind speed is not controlled by the remote controller.
(When operated in the Sleeping Mode, the wind speed is set to the
low speed by force.)
Check DISP PWB Ass'y
- Voltage between CN DISP
-
: DC
+
5V
When the detect switch(double key) inside the remote
controller door is fault, it is impossible to operate
temperature regulating(
/
) and wind speed selecting.
Check the connecting circuit between the remote controller
MICOM (No.
) - R17(2
Ω
) - IR LED - Q1 - R16(2.2K
Ω
).
Check point
• Check the connecting circuit between PIN
- R75(1K)
- C71(1000PF) - MICOM PIN
• Check Receiver Ass'y