DOWNLOAD LG DWD-1074FB Service Manual ↓ Size: 2.59 MB | Pages: 40 in PDF or view online for FREE

Model
DWD-1074FB
Pages
40
Size
2.59 MB
Type
PDF
Document
Service Manual
Brand
Device
Washing Machine
File
dwd-1074fb.pdf
Date
PREV: LG DIRECT / DRIVE / 70140 Service Manual

LG DWD-1074FB Service Manual ▷ View online

20
9-2. FAULT DIAGNOSIS AND TROUBLESHOOTING
1. Be careful of electric shock or disconnecting the parts while troubleshooting.
2. First of all, check the connection of each part terminal with wiring diagram.
3. If you replace the PWB assembly (Main), put in the connectors correctly.
CAUTION
NO
NO
NO
YES
YES
YES
YES
NO
NO
YES
<PWB ASSEMBLY (MAIN)>
<PWB ASSEMBLY (MAIN)>
(1)
(2)
(5)
(6)
Check the fuse?
Replace PWB assembly
(Main).
Replace PWB assembly
(Main).
Reconnect the PWB
assembly (Display).
Reconnect the PWB
assembly (Display).
When measuring the voltage of the outlet, 
is the voltage AC 220-240V?
Is the LED (1) on?
When measuring the voltage of natural
connector (5,6) is the voltage DC 10~16.5V?
Is connector (2)  disconnected or
disassembled?
Is wire of the PWB assembly (Display)
disconnected?
Replace PWB assembly (Display)
NO POWER
■ WD(M)-8070F(H)B, WD(M)-1070(5)F(H)B, WD(M)-1170(5)F(H)B, WD(M)-1270(5)F(H)B, WD(M)-1370(5)F(H)B 
WD(M)-8074F(H)B, WD(M)-1074(6)F(H)B, WD(M)-1174(6)F(H)B, WD(M)-1274(6)F(H)B, WD(M)-1374(6)F(H)B
WD-8078FHB, WD-1078FHB, WM-1171(6)FHB, WM-1371(6)FHB, WD-1271FB(B), WD-1071FB(B)
■ WD-8070F(H), WD-1070(5)F(H)
21
1. Be careful of electric shock or disconnecting the parts while troubleshooting.
2. First of all, check the connection of each part terminal with wiring diagram.
3. Voltage between each terminal is AC 220-240V while applying an electric current
(except secondary part of the transformer and sensors).
2
1
3
PWB ASSEMBLY (POWER)
NO
NO
YES
YES
YES
NO
NO
YES
Check the fuse?
Replace PWB assembly
(Power).
Reconnect and repair
connector.
Replace PWB assembly
(Main).
When measuring the voltage of the outlet, 
is the voltage AC 220-240V?
When measuring the voltage of blue
connector of the PWB assembly (Power),
is the voltage AC 220-240V?
Is 
connector disconnected or
or is the contact bad or cut?
Is wire of the PWB assembly (Display)
disconnected?
Replace PWB assembly (Display).
NO POWER
CAUTION
22
NO
YES
NO
NO
YES
NO
YES
YES
NO
NO
YES
YES
YES
NO
NO
NO
YES
Wiring diagram
option (HOT) 
option (HOT)
MAX
Is the water supply shut-off?
Is the tap opened?
When you press both Option button and Spin
buttons simultaneously, is the water level frequency
below 240?
Is the inlet valve filter clogged with impurity?
Is resistance of the inlet valve connector 
between 2 to 8
k
Ω
?
Check the voltage between each terminal of inlet
Valve is 220 - 240V~.
(Refer to 7-2 TEST MODE)
Is water supplied?
Are replaceptacles correctly connected to the
terminals of inlet valve?
Is detergent put in the correct compartment of
the drawer?
Is the detergent caked or hardened?
Open the tap.
Check the chamber (Air)
and the tube clogged 
with impurity. 
Clean the filter.
Replace the inlet valve.
Replace PWB assembly
(Main).
Refer to solution 
NO INLET.
Check the wiring on the
dispenser.
Put the detergent in the
correct position.
PRE+MAIN
MAIN WASH
: Detergent 
Clean the drawer.
NO WATER SUPPLY
DETERGENT DOES NOT FLOW IN
MAIN
WASH
SOFTENER
PRE -
WASH
23
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
Wiring diagram
option (HOT)
MAX
A B N O R M A L   S O U N D
S O F T E N E R   D O E S   N O T   F L O W   I N
Fix the bolt tightly.
Replace the V-belt
(4400FR3116A).
Replace the motor.
Refer to
^NO WATER SUPPLY_
Check the wiring on the 
dispenser.
Put it in the correct
compartment.
Clean the cap and
drawer.
Is the pulley bolt loosened?
Is the belt worn?
Is there friction noise from the motor?
Is water supplied?
Are receptacles correctly connected to the terminals
of inlet valve?
Is softener put in the correct compartment of
drawer?
Is the softener cap clogged?
Page of 40
Display

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