LG WT-R1195TH Service Manual ▷ View online
48
4-8-1 TROUBLESHOOTING ELSE
1. Be careful of electric shock if disconnecting parts while troubleshooting.
2. First of all, check the connection of each electrical terminal with the wiring diagram.
3. If you replace the MAIN PWB ASSEMBLY, reinsert the connectors correctly.
Is
three pin wire of
display PWB broken?
Replace the
DISPLAY
PWB
ASSEMBLY
Check the
fuse or reset
the circuit
breaker
NO POWER
Is the supplied voltage
120V AC?(+10%, -15%)
Yes
No
No
No
Yes
Yes
No
Yes
No
Display PWB
Connecting connector
MAIN PWB~ Display PWB
Is the current rating of
multi-outlet
power strip enough?
(Avoid connecting several
electric devices )
Alternate with
explanation
Is the connector connected
to PCB/Noise filter
disconnected or
disassembled?
Reconnect
or repair
the
connector
Replace the
MAIN PWB
ASSEMBLY
Is LED on while the power
is on?
CAUTION
49
4-8-1. TROUBLESHOOTING ELSE
Is the button of panel
stuck?
Is the display PCB broken?
(check the buzzer sound
and LED light
while push the button )
Replace the
DISPLAY
PWB
ASSEMBLY
Repair the
button
BUTTON DOESN’T WORK
No
Yes
Yes
Yes
No
Reconnect or
Repair
the connector
Is the connector connected
to Main PWB / Display
PWB disconnected or
disassembled?
Connecting connector
MAIN PWB~ Display PWB
51
4-9. COMPONENT TESTING INFORMATION
When Resistance (Ohm) checking the Component, be sure to turn the power off,
and do voltage discharge sufficiently.
4-10-1. FILTER ASSEMBLY (LINE FILTER)
WH
0
YL to RD
0
WH to BL
Result
Test Points
0
YL to RD
0
WH to BL
Result
Test Points
Circuit in the MAIN PWB / Wiring Diagram
Wiring
diagram
Test
points
and
Result
and
Result
(1)
(3)
BL
YL
RD
INPUT
OUTPUT
WARNING
51
4-9-2. STATOR ASSEMBLY
The DD motor can be driven from stopped to maximum speed in infinite steps in either direction.
There are 36 poles on the stator; 12 permanent magnets spaced around the rotor. There are no
brushes to wear out. Unlike a more traditional brushless motor, the rotor surrounds the stator
rather than being attached to it.
5-15
(2) to (3)
5-15
(3) to (1)
5-15
(1) to (2)
Result
Test Points
5-15
(2) to (3)
5-15
(3) to (1)
5-15
(1) to (2)
Result
Test Points
HALL SENSOR
(1) (3)
WINDINGS
(2)
HALL SENSOR
(1) (3)
WINDINGS
(2)
Circuit in the MAIN PWB / Wiring Diagram
Wiring
diagram
Result
(Windings)
Test
points
(Windings)
(Windings)
Function
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