WD-10391TD, WD-10391TDK, WD-10391TDP, WD-10721MDX - LG Washing Machine Service Manual (repair manual). Page 19

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18
8-2.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
YES
YES
YES
NO
NO
YES
<PWB ASSEMBLY (MAIN)>
Check the fuse 
Check the harness
Assembly.
When measuring the voltage of the outlet, 
is the voltage AC 220-240V~?
When measuring the voltage of Yellow(BN),
Black(BL) connector of the PWB assy, is
the voltage AC 220-240V~?
Replace PWB assembly.
NO POWER
Cancle the 
Child-Lock by pressing
both Medic Care Rinse
Button and Pre Wash
Button simultaneously
for 3 seconds.
Normal
Is Child Lock set?
First, unplug the power cord and plug again.
Check the buttons are working.
Visit to check
ALL BUTTONS ARE INOPERABLE EXCEPT POWER BUTTON  
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