LG LSC121PMA Service Manual - Page 43

Product does not operate at all., Refer to Electronic Control Device drawing and Schematic diagram.

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Page 43 highlights

2. Product does not operate at all. (* Refer to Electronic Control Device drawing and Schematic diagram.) Turn off Main Power (After 10 seconds) Turn on Main Power Does "beeping" sound is made from the Indoor Unit? NO YES Check the voltage of power(About AC 208V/AC230V, 60Hz) • Main power's voltage • Voltage applied to the unit • Connecting method of Indoor/Outdoor connecting cable • Check PWB Ass'y(Outdoor unit) - Fuse - Pattern damage - Varistor(ZNRI) Primarily, the operating condition of Micom is OK. Check each load(Indoor/Outdoor Fan Motor, Compressor, Stepping Motor) and contacting condition of related connector(including connecting cable of Indoor/Outdoor Unit) Check the connection housing for contacting • Connector related to CN-POWER • Connector related to CN-FAN • Connector contacting of Outdoor Fan/Compressor • Display PWB Ass'y Check • Connector related to CN-DC/DC Items • Power Transformer (Outdoor unit) - Input Voltage - Output Voltage • IC2(7812) Output (Indoor/Outdoor unit) • IC3(7805) Output (Indoor/Outdoor unit) • IC4(KIA7036, Reset IC) OSC01B(4MHz) (Indoor/Outdoor unit) PCB Board Operation Check Content Remedy - About AC208V/230V±10% - Check the power voltage • Replace Trans - About AC17±3V • DC +12V • Replace IC2 • DC +5V • Replace IC3 • Voltage of Outdoor unit Micom No. 8, Voltage of Indoor unit Micom No. 43 and soldering condition - 43 - • Replace faulty parts

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- 43 -
- 43 -
2. Product does not operate at all.
(* Refer to Electronic Control Device drawing and Schematic diagram.)
Turn off Main Power
Turn on Main Power
Does "beeping" sound is made from the Indoor Unit?
Primarily, the operating condition of Micom is OK.
Check the voltage of power(About AC 208V/AC230V, 60Hz)
• Main power's voltage
• Voltage applied to the unit
• Connecting method of Indoor/Outdoor connecting
cable
• Check PWB Ass'y(Outdoor unit)
- Fuse
- Pattern damage
- Varistor(ZNRI)
Check the connection housing for contacting
• Connector related to CN-POWER
• Connector related to CN-FAN
• Connector contacting of Outdoor Fan/Compressor
• Display PWB Ass'y Check
• Connector related to CN-DC/DC
Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor) and contacting
condition of related connector(including connecting
cable of Indoor/Outdoor Unit)
PCB Board Operation Check
Items
• Power Transformer
(Outdoor unit)
- Input Voltage
- Output Voltage
• IC2(7812) Output
(Indoor/Outdoor unit)
• IC3(7805) Output
(Indoor/Outdoor unit)
• IC4(KIA7036, Reset IC)
OSC01B(4MHz)
(Indoor/Outdoor unit)
• Replace Trans
• Replace IC2
• Replace IC3
• Replace faulty parts
- About AC208V/230V
±
10% - Check the power voltage
- About AC17
±
3V
• DC
+
12V
• DC
+
5V
• Voltage of Outdoor unit Micom No. 8,
Voltage of Indoor unit Micom No. 43 and soldering
condition
Content
Remedy
NO
YES
(After 10 seconds)