194
_TROUBLE SHOOTING GUIDE BOOK
1. Generation 4 Features 196
2. Function Control Setting 197
3. FDD Mode 200
4. Function Mode 210
5. SVC Mode 237
6. IDU Mode 253
Ⅳ. Function Control
App. Control Box, Inverter PCB Service and Replace Method
- 107 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
n
Control box / Inverter PCB Servicing / Dismantling Procedure.
n Control Box assembly Servicing / Dismantling Procedure
n
Inverter PCB Servicing / Dismantling Procedure
WARNING
• Do not pull out the heat sink assembly before removing the middle bracket
screws.
• Do not apply heavy force on tube parts while detaching the heat sink
assembly.
It may damage and leads to failure of device. Gently detach total heat sink
assembly.
Mid bracket
screws
Heat sink assembly
Mid bracket
Mid bracket
Mid bracket screw
Heat sink assembly
1. Remove the
control box
cover.
1. Remove the Thermal Pad mount-
ing screws at the left side of the
control box (4EA)
2. Carefully pull out the Inverter
PCB from control box assembly.
3. Detach the Compressor (U/V/W)
and the power input (R/S/T) lead
wires.
4. Unscrew the middle IGBT mount-
ing screws (2EA)
5. Finally take out the PCB from the
corner supporters.
6. Follow the same procedure (1~5)
inversely to reassembly the
inverter PCB.
Note.
1. Apply thermal grease at heat sink
if needed.
2. Carefully reconnect the wires with
out interchanging the locations.
2. Remove the middle bracket screws
as shown in the figure.
3. Gently detach the
Heat sink assembly
from the control box
4. Detach Fan lead wire from
the control box and compres-
sor lead wires from the com-
pressors.
5. Now the control box assem-
bly can be removed from the
outdoor unit after removing
the outer screws.
6. Inversely follow above proce-
dure (1~5) to reassemble the
control box.
Note.
Apply thermal grease at the
heat sink if necessary.
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