DOWNLOAD LG WM2550HVCA Service Manual ↓ Size: 41.93 MB | Pages: 60 in PDF or view online for FREE

(1)

(2)

BL

WH

WH

WH

WH

RD

BL

BL

BL

OR

RD

BL

BL

WH

WH

WH

WH

RD

BL

BL

BL

OR

RD

BL

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

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

Press the START/PAUSE

button 2 times in QC

Test mode, is the drum spinning at low speed?

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

Resistance of terminal: 

① -② / ② -③ /

③

-① : About 5  Ω - 15 Ω

Replace the MAIN PWB ASSEMBLY

Does the spring of Latch Hook actuate?

Is there clicking sound once or twice when the
START/PAUSE button is pressed to start the cycle?

Is DOOR SWITCH ASSEMBLY broken?

Replace Door Assembly.

Check the DOOR SWITCH
ASSEMBLY Connector and
MAIN PWB ASSEMBLY

(Red 3 pin, Yellow 4 pin and

white 3 pin connector (1)).

Replace the DOOR
SWITCH ASSEMBLY.

③

②

①

9-1. FILTER ASSEMBLY (LINE FILTER)

9. COMPONENT TESTING INFORMATION

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

(3)
(1)

WH1

(3)

(1)

RD1

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 the wash cycle.

1. Operation for door closing

- After the system turns on, PTC heating starts up through terminals 2 and

4 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.

Test Points

(2) to (4)

(3) to (4)

(4) to (5)

(2) to (4)

Result

700-1500

Ω

60-90

Ω

Infinity

120 Vac

Remarks

At 77

°F

(25

°C

)

At 77

°F

(25

°C

)

Voltage Input

(2)

(3)

(4)

(5)