Alignment Procedures - Medion B1997PNST Service Manual

4-2 Alignment Procedures

4-2-1 High Voltage Adjustment
CONDITION
Display image : Crosshatch pattern
PROCEDURE
Connect DC meter to TP001 and adjust VR102 to obtain a DC voltage of -152 ± 1V DC .
4-2-2 Screen and White Balance Adjustment
CONDITION
Switch S701 to factory mode, then press " " and " " buttons simultaneously when switching the
power "On".
Warm up 30 minutes
Mode : 93 KHz / 1600 x 1200
Display image : No video
PROCEDURE
1-a Set Brightness to maximum, G1 at "70" OSD-step, and G2=625 V, Contrast to maximum.
Select "preset color" then choose "9300°K"
1-b Adjust Green cut-off around "70" OSD-step.
1-c Adjust G1 and R/B cut-off to get 0.8+0.15 / -0.1 FL of raster light output.
1-d Confirm x=283±5, y=297±5.
CONDITION
Display image : 50 mm x 50 mm white block pattern
PROCEDURE
2-a Set Brightness to mid-level.
2-b Adjust Contrast to maximum.
2-c R/B signal off and adjust green gain to get Y=25 ± 0.2 FL.
2-d R/B signal on, adjust R/B gain to get x=283±5, y=297±5.
CONDITION
Display image : Full white pattern
PROCEDURE
3-a Set Brightness and Contrast to maximum.
3-b Adjust "ABL" to 32±1 FL.
4-a Repeat all the procedure in 4-2-2 section until the best white balance is obtained, then power off.
4-b After screen and white balance adjustments, S701 must be switched to Normal mode.
Alignments and Adjustments
MD 1998LE (B1997PNST)
Page 15