How To Diagnose And Repair By Symptom - LG WF-T857 Service Manual

4-9. HOW TO DIAGNOSE AND REPAIR BY SYMPTOM

1) Washer is not energized.
Where, what & how to check?
Household Power supply
1. Check whether connection between
the plug and the electrical is poor
2. Measure voltage of the electrical.
Wiring of the Washer
1. Measure resistance between both
ends of the power supply cord with
both the plug pins short-circuited.
2. Check whether every connector in
the bundle of connectors has a
good connection.
3. Check resistance of every wire to
find out a open wire.
Electrical component
1. Check resistance with power relay
switch turned on
2. Check the secondary voltage of the
transfomer.
3. Measure resistance to check
whether the T.P of the motor is
blown out.
4. Check whether the fuse is open.
Controller
If there are no defects in the above,
it should be defect of the controller.
If supply voltage is 120% higher than
rating the varistar in the controller may
be broken. Check supply voltage.
Result of Check Possible Cause
Poor Defect of the
electrical
Around rating
No defect
0V Defect of household
power supply
Less than 1 No defect
Open circuit of the
power supply cord
Male & female
Poor connection.
connectors
separated
Wire is opened.
Less than 0.5
No defect
More than 1.0
Poor contact
10~14V
No defect
0V
Coil is open
T.P blown out
motor is hot
Open
Defect of the fuse
Over 120%
voltage than
rating check
40
How to repair & settle
Change the electrical.
Call for power supply
company
Change the power
supply cord.
Remove the cause to
give strain and
reconnect them.
Change the lead wire.
Change the AUTO OFF
Switch
Change the
transfomerformer.
Remove cause to
overload the motor
Change the fuse.
CAUTION
Check the fuse rating
AC100~127V:125V 12A
AC220~240V:250V 6A
Change the controller
if all the electrical parts
have no defects.