LG WT5101HV / WT5170HV / WT5170HW Service Manual ▷ View online
37
Replace the
DISPLAY PCB
ASSEMBLY
Is the display PCB broken?
(check the buzzer sound and
LED light while touch the
LCD)
Yes
Yes
No
Is the connector connected to
Main PCB / Display PCB
disconnected or
disassembled?
Reconnect or
repair the
connector
Connecting connector
Main PCB~ Display PCB
POWER BUTTON DOESN’T WORK
Yes
No
Is the button of panel stuck?
Repair the button
5. COMPONENT TESTING INFORMATION
5-1. FILTER ASSEMBLY (LINE FILTER)
38
When resistance (Ohm) checking the component, be sure to turn the power off, and do
voltage discharge sufficiently.
Wiring
diagram
Test
points
and
Result
Circuit in the MAIN PCB / Wiring Diagram
MAIN PCB
ASSEMBLY
3 3
1 1
RD1
WH1
Vac
1 1
2 2
2 2
Test Points
WH (1) to RD (1)
WH (3) to RD (2)
WH (3) to RD (2)
Result
0 Ω
0 Ω
0 Ω
(1)
(3)
(1)
(2)
RD1
WH1
WARNING
5-2. DOOR LOCK SWITCH ASSEMBLY
39
Wiring
diagram
Function
Circuit in the MAIN PCB / Wiring Diagram
The Door Lock Switch Assembly consists of a DC Motor, a Bimetal, a Protection PTC, Sensing Point.
It locks the door during a wash cycle.
1. Operation for door closing
- After the system turns on, Micom sending motor locking signal.
- 12V motor is working.
- Spring that connected with motor shaft is working.
- The hook that connected with spring is pushed out.
- Door lock is detected when switch sensing point is detected lock position.
- The motor stop.
- Door locked
The maximum, allowable number of impulse authorizations is 3
- Upon the third authorization of the impulse, the position of hook goes back to the door-open
position.
- Authorizing the impulse occurs in 4.5 seconds upon input for max performance and two
authorization processes are allowed at most.
2. Operation for door opening
- With a temporary stop, door automatically opens by hook moving after micom send open signal
and the power turns off – maximum of 3 times of the authorizing period
- Upon the fourth authorization of the impulse, the position of CAM goes back to the door-close
position.
Result
33 ~ 46 Ω
9 ~ 11 AT
40
Test points
Result
Test Points
(1)To (2)
(1)-Black / (2)-Brown
(4) To (5)
(4)-White / (5)-Green
(1)
(2)
(3)
(4)
(5)
(6)
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