[old_tv_nut]

In the absence of setup instructions, you can take a stab at it.

If this set has a SETUP switch, switch to setup mode, which should give a single horizontal white or gray line. Turn down the G2 (screen) R,G,B controls until you just barely see a neutral dark gray line. Switch out of setup mode and adjust the brightness control as needed.

If there is no setup switch, try turning down the brightness some with the G2 (screen) R,G,B controls and then turning brightness back to normal with the brightness control. You may end up with a color tint in the shadows; fix that by turning down the predominant one or two of R,G,and/or B.

Note: some sets had a jumper to set the G2 range to higher or lower.