LG 22LS4R Service Manual page 15

2. No RASTER : [B] Process
Check LED status
On Display Unit.
Pass
Check Panel Link
Cable or Module.
Pass
Check Inverter
Connector or
inverter.
Pass
Check Output of
L300.
Pass
Check the LVDS
Output of IC100.
Pass
Check Input source Cable and Jack.
Fail
Repeat A PROCESS.
Fail
Change Panel Link Cable or Module.
Fail
Change Inverter Connector or Inverter.
Fail
Change L300.
Fail
Change IC100
Fail
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Change Module.