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Fault Diagnosis And Troubleshooting - LG WD(M)-8070F(H)(B) Service Manual

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9-2. FAULT DIAGNOSIS AND TROUBLESHOOTING

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
CAUTION
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.
(1)
<PWB ASSEMBLY (MAIN)>
(2)
(6)
(5)
<PWB ASSEMBLY (MAIN)>
NO POWER
When measuring the voltage of the outlet,
is the voltage AC 220-240V?
YES
Is the LED (1) on?
YES
When measuring the voltage of natural
connector (5,6) is the voltage DC 10~16.5V?
YES
Is connector (2) disconnected or
disassembled?
NO
Is wire of the PWB assembly (Display)
disconnected?
NO
Replace PWB assembly (Display)
20
Check the fuse?
NO
Replace PWB assembly
NO
(Main).
Replace PWB assembly
NO
(Main).
Reconnect the PWB
YES
assembly (Display).
Reconnect the PWB
YES
assembly (Display).

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