WD-1070FB, WD-1071FB, WD-1071FBB - LG Washing Machine Service Manual (repair manual). Page 27

When checking the voltage between 
connector the PWB assembly (Main)
during whites washing ,Is the voltage 
220 - 240V    ?

Replace the PWB 
assembly (Main).
 

After power off and the heater terminal is
disconnected, is the resistance 10 to 30   ?

Replace the heater 
assembly.

After power off,is the resistance of wire
(RED-YELLOW) connectors between
10    to 30   ?

Normal.

RED

YELLOW

1

2

4

3

  ~    

220 - 240V~

220-240V

PWB ASSEMBLY (MAIN)

■ 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)

When checking the voltage between two
receptacles of the PWB assembly (Power) during
washing.
Is the voltage  220-240V?

After power off, is the resistance between yellow
wire and red wire of connector 10 to 30 ?

After power off, is the resistance of heater

10 to 30 ?

Replace the PWB
assembly (Power).

Normal. 

Replace the heater
assembly.