LG 31522 Service Manual ▷ View online
4. SERVICE INFORMATION
4-1. WIRING DIAGRAM
21
WIRING DIAGRAM
▶ Be sure to unplug the power to repair and replace
electric parts.
ESD (ElectroStatic DIscharge) WARNING
Be sure to follow proper ESD and grounding
precautions for diagnosis and repair. If this is
not possible, touch the ground wire on a
regular basis to remove any static charge built
up on your person.
precautions for diagnosis and repair. If this is
not possible, touch the ground wire on a
regular basis to remove any static charge built
up on your person.
1) Remove front panel and main PCB
assembly
① Remove 5 panel fixing screws attaching the panel
on the back.
② Disassemble Rear Panel.
③ Pull the front panel forward.
④ Disassemble the protective cover.
⑤ Disconnect the leads from the controller.
④ Disassemble the protective cover.
⑤ Disconnect the leads from the controller.
⑥ Remove 9 screws on the PCB assembly.
⑦ Disassemble PCB assembly.
⑦ Disassemble PCB assembly.
Rear Panel
Main PCB
Protect cover
Display PCB
4-2. DISASSEMBLY INSTRUCION
22
23
2) Disassembly of the Noise Filter,
Power Cord, Inlet Valve, Pressure
Switch, and DT Housing.
Noise Filter and Power Cord(Figure A)
① Remove the two screws attaching the noise filter.
②
Disconnect 2 connector in Noise Filter and
Disassemble Noise Filter and Power Cord.
Inlet Valve (Figure B)
①
Disconnect the leads from the inlet valve and remove
three screws.
②
Remove the hoses and output pipes from the input
valve.
③
Remove the inlet valve.
Pressure Switch (Figure C)
①
Disconnect the leads from pressure switch and
disassemble pressure switch
②
Disconnect pressure tube from the pressure switch .
DT Housing (Figure D)
①
Remove the hoses and output pipes from the input
valve.
②
Disassemble the connector pipe and the DT housing.
Ⓐ
Ⓐ
Ⓑ
Ⓒ
Ⓓ
Ⓑ
Ⓒ
Ⓓ
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3) Disassembly of Top Cover and Lid
①
Insert a flat blade between the cabinet and the top
cover to release the latches.
②
Lift the top cover.
③ Use the blade to push the left hinge out of the
way and to displace the hinge pin to remove the
lid.
lid.
④
Remove the lid by pulling the right hinge pin out of
its holder.
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