Toshiba TCL M28LG2 Service Manual page 39

) Adjustment of Sub-contrast, Sub-tint and Sub-color for NSTC and PAL signal.
1. Enter D-mode, and connect the probe of Oscilloscope to the conjunction between R201 and P201
(B-out).
2. Apply the Grey-scale/Color-bar (NTSC signal) to the AV input, in STANDARD status.
3. Select CNTC to adjust the sub-contrast, until that the amplitude "A" is 2.5V
4. Select COLC to adjust the sub-color by tuning the amplitude of "a" and "d" to the same.
5. Select TNTC to adjust the sub-tint by tuning the amplitude of "b" and "c" to the same.
6. Apply the Grey-scale/Color-bar (PAL signal) to the AV input, in STANDARD status.
7. Select COLP to adjust the sub-color by tuning the amplitude of "a", "b", "c" and "d" to the
same.
IV) Adjustment of Focus, Screen Voltage and Sub-brightness
1. Receive a crosshatch pattern.
2. Adjust the "FOCUS" VR on the flyback the make the picture clear.
3. Enter D-mode and press "MUTE" key and the screen will become a horizontal line. Then adjust
the "SCREEN" VR on the flyback transformer to set the intensity of the line to a minimum
visible level (the line can just be seen).
4. Press "MUTE" key again and the TV will become full raster.
5. Select BRTC to adjust the sub-brightness, until that the 2
be seen.
V) Adjustment of White balance
1. Receive a black and white pattern at STANDARD status.
2. Use a color analyzer to measure the black side of the screen. By changing the value of BB and
GB, set the reading of the color analyzer to x=274, y=280.(11500 K)
3. Then measure the white side of the screen. By changing the value of BD and GD, set the reading
of the color analyzer to x=274, y=280.
4. Repeat step 2&3 until you can get the correct reading for both black and white sides.
5. Warm: x=291, y=300; Adjustment Item: WRCUT, WGCUT, WBCUT, WGDRV, WBDRV.
6. Cool : x=265, y=265; Adjustment Item: CRCUT, CGCUT, CBCUT, CGDRV, CBDRV.
7. DVD White Balance fine adjustment Item: UBK, VBK.
VI) Adjustment of Pincushion and Picture Width (for pure flat model only)
1. Receive a crosshatch pattern.
2. Adjust VR1124 until the vertical line become straight.
3. Adjust VR1123 for horizontal size.
a
b c
d
2
as shown below.
P-P
A
nd
dark bar of 8 level grey scales just can