DOWNLOAD LG 48842800 Service Manual ↓ Size: 6.84 MB | Pages: 51 in PDF or view online for FREE

Refer to 
NO WATER SUPPLY

Put the detergent in the
correct place. 

Check the wiring.

Clean the dispenser.

Is water supplied?

Is the detergent caked or hardened?

Are receptacles correctly connected to the
terminals of the INLET VALVE ASSEMBLY?

Has detergent been put in the correct compartment
of the dispenser?

Press the  START/ PAUSE button 2 times in QC
Test mode, is the drum spinning at low speed?

Check during spin if the frequency of the water
level is 248 or more. 

Is it disconnected, or disassembled? 
[Red:3pin (1), NA:4pin (2)]

Check the motor connector, Is the resistance of
the terminal the same as the figure?
MOTOR TERMINAL

Replace the MAIN PWB ASSEMBLY

Resistance of terminal: 

¥L-¥M / ¥M-¥N / ¥N-¥L : About 5

Ω - 15Ω

Check the SENSOR SWITCH
ASSEMBLY or HOSE(Pressure).
If the problem is on the SENSOR
SWITCH ASSEMBLY or the
HOSE, replace the SENSOR
SWITCH ASSEMBLY or the
HOSE.

Normal

Correct the connection.

Replace the STATOR
ASSEMBLY

¥N     ¥M    ¥L 

Refer to 
NO WATER SUPPLY

Check the wiring on the

dispenser.

Put it in the correct

compartment.

Clean the cap and
container.

Secure the bolt.

Check hall sensor.
Replace If defective.
Then check stator.
Replace if necessary.
Check rotor for broken
magnets.
Replace rotor if necessary.

Is water supplied?

Are the plugs correctly connected to the terminals of
the INLET VALVE ASSEMBLY?

Is softener / bleach put in the correct compartment of
the drawer?

Is the softener / bleach cap clogged?

Is the motor bolt loosened?

Is there friction noise coming from the motor?

9. COMPONENT TESTING INFORMATION

9-1. FILTER ASSEMBLY (LINE FILTER)

When Resistance (Ohm) checking the Component, be sure to turn the power off,
and do voltage discharge sufficiently.

Test Points

Result

WH (1) to RD (3)

WH (3) to RD (1)

0 

Ω

0 

Ω

(1) (3)

(3)
(1)

RD

WH

9-2. DOOR LOCK SWITCH ASSEMBLY

AC
Common
terminal
of Valve

The Door Lock Switch Assembly consists of a Heating PTC, a Bimetal,
a Protection PTC, and a Solenoid. It locks the door during a wash cycle.

1. Operation for door closing

- After the system turns on, PTC heating starts up through terminal 2~4’s

authorizing the power on.

- After PTC heating starts up and before solenoid operation is driven,

force the system to the off position through CAM.

Door close

- Authorizing one impulse through terminal 3~4 (PTC & solenoid) will

make the door locked.

- Door lock is detected when switches in terminal 4~5 are set closed.

CAM rotation will forcibly clear off the connection.
The maximum, allowable number of impulse authorizations is 2.
Upon the third authorization of the impulse, the position of CAM 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.

Normal operation period of PTC heating: 1.5 – 5 seconds.
(Defects from the development process.)

2. Operation for door opening

- With a temporary stop, door automatically opens by CAM rotations after

authorizing the impulse from the terminal 3 ~ 4 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.