LG 15LC1RB-MG Service Manual page 19

No Raster
Check LED Status
on display unit
Pass
Check
U401~U405, U407, U409
Pass
Check the input/
Output of U301
Pass
Check inverter
Connector or inverter
Pass
Check panel link
Cable or module
Pass
Check input source cable and jack
:[B]Process
Fail
Fail
Fail
Fail
Fail
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Repeat [A] PROCESS
Change U401~U405,
U407, U409
Change U301
Change inverter
connector or inverter
Change panel link
cable or module