LG 20LS1R-ZG - Raster and Display Problems

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