LG RD-JT30 Service Manual page 43

6) Others layer (Fig-7):
(Fig-7) YPbPr layer
6.1) Gamma index: system auto select DLP gamma index
6.2) Gray value: adjust here to check DMD fail pixel.
6.3) Blue value: adjust here to check DMD fail pixel.
6.4) Scaling: tell you what scaling mode is using now.
6.5) Pc/PbPr Mode: index of input timing
6.6) RS232: Enable / Disable RS232 control
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