DOWNLOAD LG WF-T753A Service Manual ↓ Size: 3.99 MB | Pages: 57 in PDF or view online for FREE

Model
WF-T753A
Pages
57
Size
3.99 MB
Type
PDF
Document
Service Manual
Brand
Device
Washing Machine
File
wf-t753a.pdf
Date

LG WF-T753A Service Manual ▷ View online

35
ERROR DECISION
CAUSE FOR ERROR
BASIS
OCCURRENCE
REMEDY
ERROR
• LID is opened in the
course of
intermittent spin,
normal spin or
processing
reservation.
• SIGNAL
continuously ringing.
• Water Pressure
Switch is off.
• AUTO OFF relay
S/W is out of order.
• In the second QC
MODE, the following
message is
displayed.
DOOR
OPEN
PRESSURE
SENSOR
AUTO
OFF
LAUNDRY
AMOUNT
SENSOR
• Lid is opened during intermittent
spin or normal spin?
• Lid is opened while processing
reservation?
• Connector to the S.F S/W or
VIOLET(VL) 2 PIN
CONNECTOR to the P.W.B ASM
has bad connection.
• S.F S/W or BALL PRESSURE
SENSOR is bad or bad contact.
• Is placed magnetic in LID-B?
• Connector the Ball Pressure
Sensor(Pressure Switch) or
BLUE(BL) 3 pin connector to
P.W.B ASM has bad connection.
• Ball Pressure Sensor
(Pressure Switch) is bad.
(In the initial state of QC TEST
MODE, the number on the
DISPLAY is less than 63 or
more than 70)
• BLUE(BL) 1pin connector to
P.W.B ASM has bad connection.
• Check MOTOR, CLUTCH, 
V-BELT, CONDENSOR.
• Check over all connectors  if
they have bad connection.
• Closed the lid.
• Closed the lid.
• Correct the connector contact.
• Check and replace S.F S/W or
BALL PRESSURE SENSOR.
• Change the LID-B.
• Correct the connector contact.
• Replace Ball Pressure
Sensor(Pressure Switch).
• Correct the connector contact.
• Change P.W.B ASM.
• Adjust or replace those parts.
• Correct the connectors contact.
36
4-9.  HOW TO DIAGNOSE AND REPAIR BY SYMPTOM
1) Washer is not energized.
Where, what & how to check?
Result of Check
Possible Cause
How to repair & settle
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.
Poor
Around rating
0V
Less than 1
Male & female
connectors
separated
Less than 0.5
More than 1.0
10~14V
0V
motor is hot
Open
Over 120%
voltage than 
rating check
Defect of the 
electrical
No defect
Defect of household
power supply
No defect
Open circuit of the
power supply cord
Poor connection.
Wire is opened.
No defect
Poor contact
No defect
Coil is open
T.P blown out
Defect of the fuse
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.
37
2) Defects on displaying function
Where, what & how to check?
Result of Check
Possible Cause
How to repair & settle
Main voltage
1. Measure mains voltage at the wall 
outlet
2.  Meaure voltage at the extended 
outlet that the washer is plugged in 
if the extended outlet is used and 
voltage at the electrical outlet
is normal in the above.
Transfomer
1. Measure the secondary voltage of 
the transfomer.
Controller
1. Defect of LED.
2. Defect of LED driving circuit.
3. Defect of micom.
Less than 85%
of the rating.
Less than 85%
of the rating
Less than
AC 10V
Low voltage. 
The dia of the lead 
wire is smaller or 
many loads are 
connected at the 
same outlet
Defect of the
transfomer.
Defect of controller.
To explain that it is 
caused by low voltage in 
electric supply and
recommend using a 
transfomer if voltage has
been continuously low.
To use a transfomer 
having a enough
capacity if using 
a transfomer.
Change the controller.
Change the controller.
3) Reset During operation
Where, what & how to check?
Result of Check
Possible Cause
How to repair & settle
Mains Voltage
1. Measure voltage of the outlet that the 
washer is plugged into during wash and 
spin.
2. Reset symptom happens at specific 
time zone repeatedly.
3. Check whether a transfomerlent
power cut happens.
(Fluorescent lamp is 
transfomeriently blinked.)
Less than 
80% of the rating.
Mains voltage is too
low or size of a lead
wire is too small.
External noise 
inrushed.
Explain that it is caused 
by low voltage in electric 
mains and recommend
using a suitable size of
leads.
Explain it is caused by 
using environment.
(It happens when 
equipment with high 
frequency is used 
around)
Explain it is a problem of 
electric supply 
environment.
38
4) Water doesn’t come into the wash tub.
Where, what & how to check?
Result of Check
Possible Cause
How to repair & settle
Inlet Valve
1. If water doesn’t come though the 
inlet valve works(electric sound 
occurs)
1) Check whether water mains is cut.
2) Check whether tabs are turned on.
3) Hot & cold tab are opposite
connected.
4) Wrongly select water temperature
option.
5) If there are no problems in the 
above, check the inlet valve filters 
after disconnecting the water supply
hoses.
6) If there are no problems in the 
above a diaphragm hole in the valve
is blocked  by foreign substance or 
the plunger in it is locked.
2. If the inlet valve doesn’t work(there 
is no electric sound)during filling 
cycle.
1) Check whether it’s connectors are 
taken off or they have poor 
connection. 
2) Check resistance of the inlet valve.
Water mains cut.
Don’t tumed on.
Connected
opposite.
Selected 
opposite.
Filters blocked
by foreign
substance.
A connector is
taken off.
Mains cut. 
Mistake of use.
Wrong installation.
Mistake of use.
Don’t clean.
Defect of the
inlet valve.
Defect of contact.
Coil is open
Explain.
Turn on the tap.
Correct their locations
and turn on the tap.
Explain how to use. 
Clean them by brush 
and explain cleaning 
regulary them.
Change the inlet valve.
Reconnect it or remove
the causes to make poor 
connection.
Change the inlet valve.
Where, what & how to check?
Result of Check
Possible Cause
How to repair & settle
Drain Motor
1. Operate washer setting spin only, 
then  press the start/pause button 
when the  wash motor starts to work 
and then press the start/pause 
button again in order for the drain 
motor to work intermittently.
Controller
1. If mains voltage and the drain motor 
have no defects a defect of the 
controller is highly possible.
Reset happens
after the drain
motor works.
Defect of the drain 
motor (A noise 
generated when the 
internal relay 
works.)
Change the drain motor
Change the controller.
3) Reset during operation
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