DOWNLOAD LG LS-J0762Y / S07LHN Service Manual ↓ Size: 6.28 MB | Pages: 101 in PDF or view online for FREE

-56-

• Confirm that the vertical louver is normally geared with the shaft of Stepping Motor.
• If the regular torque is detected when rotating the vertical louver with hands

⇒

Normal

• Check the connecting condition of CN-U/D Connector
• Check the soldering condition(on PCB) of CN-U/D Connector

Check the operating circuit of the vertical louver

• Confirm that there is DC +12V between pin 

➀

of CN-U/D and GND.

• Confirm that there is a soldering short at following terminals.

- Between

41

,

42

,

43

and 

44 

of MICOM

- Between

4

,  

5  ,   6   

and  

7

of IC01M  

- Between 

10

, 

11 ,  12 

and 

13

of IC01M

If there are no problems after above checks.

• Confirm the assembly condition that are catching and interfering parts in the link of the

vertical louver

-57-

Does the Operating LED of indoor unit blink
when Operation's ON?

Is the Connection between indoor power
relay Pin 

➂

and terminal block No. 1 right?

Refer to the self-diagnosis function.

YES

Check the connecting state of connector

NO

NO

Is the connection of cable between indoor
and outdoor unit right?

1(Brown)

1(Brown)

2(Blue)

2(Blue)

3(Green/YL)

3(Green/YL)

4(Red)

4(Red)

NO

YES

Is the voltage of CN-POWER 

➀

,

➁

in

outdoor PCB Ass'y about AC220V / 240V
when Operation's ON?

Check the Fuse of Outdoor PCB Ass'y.

NO

YES

Is the voltage of Terminal Block 

,

in

outdoor PCB Ass'y about AC220V / 240V?

Check the PTC and RY-PWR.

NO

YES

Is the Bridge Diode(DB01S) right?

Replace the Bridge Diode.

NO

YES

Replace the PCB Ass'y.

NO

-58-

Does the LED01M of outdoor PCB Ass'y
blink 6 times?

Check the state of connecting cable (3 line)
between indoor and outdoor uint.

■

➅

NO

YES

Is the connecting state of connectors in
outdoor. PCB Ass'y right?
(CN-UVW)

• Electrical wiring diagram (Colors)
• Check the connecting state of connectors

in PCB Ass'y

• If CN-UWV is connected, the comprressor

can be operated a opposite direction.

NO

YES

Is the power module in 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

NO

YES

Is the voltage of T/Block 

, 

over than

AC150V?

Check the supplied voltage.

NO

YES

Is the voltage of GND-IPM(22 pin) over
than about DC280V?

• Check the DC voltage between IPM 2pin

GND

NO

YES

Is the refrigerant pressure right?

Replace the PCB Ass'y.

• Main PCB Ass'y
• Control Box Ass'y

Supply the refrigerant.

NO

NO

-59-

■

➄

Does the operating LED in display PCB
Ass'y blink 5 times?

• Check the state of connecting cable 

(3 line) bewteen indoor and outdoor unit .

• Check Fuse, Noise Filter, PTC, etc.

NO

YES

Is the voltage of BR/BK, RD AC220/240V in
Main PCB Ass'y.

• Electrical wiring diagram(Colors)
• Check the connecting state

of connectors in outdoor PCB Ass'y 

• Check the Fuse of outdoor PCB Ass'y.

NO

YES

Is the connection of CN-DATA between
indoor and outdoor unit right?

Replace the PCB Ass'y.

• Main PCB Ass'y (Indoor/Outdoor)
• Control Box Ass'y.

• Reconnect the cable to terminal block.
• Check the PCB pattern(Resoldering).

NO

YES