LG 31513 Service Manual ▷ View online
37
4-7. OTHER TROUBLESHOOTING
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 PCB assembly, reinsert the connectors correctly.
NO POWER
Replace the
DISPLAY PCB
ASSEMBLY
Is three pin wire of display
PCB broken?
Yes
Replace the MAIN
PCB ASSEMBLY
No
Is LED on while the power is
on?
Yes
Check the fuse or
reset the circuit
breaker
Yes
Is the supplied voltage
120V AC?(+10%, -15%)
No
Reconnect or
repair the
connector
Yes
Is the connector connected to
PCB/Noise filter disconnected
or disassembled?
No
Alternate with
explanation
Yes
Is the current rating of multi-
outlet power strip enough?
(Avoid connecting several
electric devices)
No
Display PCB
Connecting connector
MAIN PCB~ Display PCB
CAUTION
38
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
39
5-1. FILTER ASSEMBLY (LINE FILTER)
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. COMPONENT TESTING INFORMATION
40
5-2. DOOR LOCK SWITCH ASSEMBLY
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, the microprocessor sends a 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 stops.
- 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.
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