LG General Wall Mounted-Inverter Type - Manual (Page 41)

Service Manual 41
Part 4 Trouble Shooting
The Product doesn’t operate at all. (9~30kBtu/h Model)
Turn off the main power and wait until LED on outdoor PCB is off.
Turn on the main power again.
Does "Beeping" sound is made from the indoor unit?
Does "Lighting" LED is mounted on the outdoor PCB?
• Primarily, the operating condi-
tion of Micom is O.K.
• Check CN-DISP1
Check the voltage of power(AC 208~230V, 60Hz).
• The voltage of main power.
• The voltage applied to the unit.
• The connecting method of Indoor/Outdoor connecting cable (each color)
• The P.W.B. Ass'y
(Fuse,Noise Filter, Power Module(SMPS), IC01D,IC04D)
Trouble 1
NO YES
The operation check of the P.C.B. Ass'y
Procedure Specification
1) The input voltage of Power
Module(SMPS)
2) The output voltage of Power
Module (SMPS)
3) IC01D(LD1085), IC04D(7805)
: DC 220V~390V
: 15V 10%
: DC 5V
Remedy
Replace the P.C.B.
6. Electronic Parts Troubleshooting Guide