Daewoo DTH-20D5FSN Service Manual page 10

Select Subbrightness item, adjust Subbrightness data value to obtain normal brightness level.
Press the DISPLAY button to memorize the data.
CONTRAST
Fixed value = 10
TINT
Fixed value = 27
COLOR
Fixed value = 15
7) FACTORY OUTGOING MODE (S12 : FACT)
If you select the S12, then the set becomes factory outgoing status.
You can see the OSD "outgoing OK"
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ALIGNMENT INSTRUCTIONS