Read LG 41722 Service Manual online
32
8-5. TROUBLE SHOOTING ELSE
NO POWER
1. Be careful of electric shock if disconnecting parts while troubleshooting.
2. First of all, check the connection of each electrical terminal with the wiring diagram.
3. If you replace the MAIN PWB ASSEMBLY, reinsert the connectors correctly.
2. First of all, check the connection of each electrical terminal with the wiring diagram.
3. If you replace the MAIN PWB ASSEMBLY, reinsert the connectors correctly.
CAUTION
Check the
fuse or reset
the circuit
breaker
fuse or reset
the circuit
breaker
Yes
No
Is the current rating of
multi-outlet power strip
enough?
(Avoid connecting several
electric devices.)
multi-outlet power strip
enough?
(Avoid connecting several
electric devices.)
Is the supplied voltage
120V AC?(+10%, -15%)
120V AC?(+10%, -15%)
Alternate with
explanation
explanation
Yes
No
No
Check the connectors at the
main PCB and the line filter.
Are the connectors loose or
disconnected?
main PCB and the line filter.
Are the connectors loose or
disconnected?
Reconnect
or repair
the connector
or repair
the connector
Yes
Replace the
MAIN PWB
ASSEMBLY
MAIN PWB
ASSEMBLY
Main LED
Yes
No
Is LED on while the power
is on?
is on?
Replace the
DISPLAY
PWB
ASSEMBLY
DISPLAY
PWB
ASSEMBLY
Display PWB
Connecting connector
MAIN PWB~ Display PWB
No
Is three pin wire of
display PWB broken?
display PWB broken?
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