DOWNLOAD LG LWB0760ACL Service Manual ↓ Size: 1.55 MB | Pages: 71 in PDF or view online for FREE

Model
LWB0760ACL
Pages
71
Size
1.55 MB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner
File
lwb0760acl.zip
Date

LG LWB0760ACL Service Manual ▷ View online

—20—
Is the Trans output power
AC 220V?
Is the Trans output power
about AC 13V?
Is shorted the Trans. output?
Is output Voltage of IC2
DC 12V?
Is output Voltage of IC3
DC 5V?
Is the voltage No.20 of IC1
DC 5V?
Exchange Main PCB Ass'y.
Is the 
connection between
Main and Display 
all right?
Is the reset circuit all right?
(The No.16 of 
IC1 is 5V.)
• Check the Fuse.
• Check the wiring diagram.
• Check the Main 
  PCB pattern.
• Exchange the Trans.
• Exchange BD1.
• Exchange IC2.
• Exchange IC3.
• Exchange IC4, C07.
• Connect connector
  exactly.
• Check the PCB 
  pattern.
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
YES
ELECTRIC PARTS TROUBLESHOOTING GUIDE 
(LW-B0967CL)
Possible Trouble 1
• The unit does not operate.
—21—
Is setting 
Temp. set lower than Room 
Temp.-0.5
°
C?
Is the voltage No.10
of IC7 0V?
• Exchange IC7.
• Select the setting Temp. to lower Number.
• Wait 3 Minutes
Is the Unit for 3 minutes
delay?
• Exchange MAIN 
  PCB Ass'y.
Is the voltage N0.7 of 
IC 7 DC 5V?
• Check the RY-COMP.
• Check the wiring 
  Diagram.
NO
NO
NO
NO
YES
YES
YES
YES
Possible Trouble 2
• The compressor does not operate.
Is the wire connection of 
RY-COMP all right?
• Check the RY-COMP.
• Connect LEAD Wire to 
  RY-COMP again.
NO
YES
Possible Trouble 3
• The compressor always operate.
—22—
• Exchange IC1.
• Exchange IC7.
Is the voltage NO.2 or 3
of IC7 DC 5V?
Is the voltage NO.14 or 15
of IC7 0V?
• Check the RY-High or 
             RY-Low.
• Check the wiring diagram.
NO
NO
YES
YES
Possible Trouble 4
• Fan does not operate.
Is the voltage of Battery
about over 2.3V?
• Exchange Receiver Ass'y.
Is the connection of 
CN-DISP2 all right?
Is the voltage No.7 
of CN-DISP2 on Main PCB 
Ass'y DC 5V?
• Exchange the battery.
• Check the PCB pattern.
• Connect connector to 
  CN-DISP2 exactly.
NO
NO
NO
YES
YES
YES
Possible Trouble 5
• Romote controller does not operate.
—23—
NO
NO
NO
NO
YES
YES
YES
Is the IC6 all right?
Is the connection of 
CN-DISP1 all right?
• Exchange the display 
  PCB Ass'y. 
• Exchange IC6.
• Exchange TR1, 
  TR2, TR3.
• Connect connector 
  to CN-DISP1 exactly.
Does the TR1, 
TR2, TR3 operate normally
on main PCB Ass'y?
Possible Trouble 6
• It displays abnormally on Display PCB Ass'y.
NO
NO
YES
YES
Is the Knob of SW1
set to left position?
Is the voltage No.3 of 
CN-DISP2 of Main PCB
Ass'y DC 5V?
• Reference to 
  OWNER'S MANUAL.
• Set the Knob of SW1 
  to left position.
• Check the SW1.
• Check the pattern of 
  Main & Display PCB.
Possible Trouble 7
• The function of Auto Restart does not operate.
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