Focus Adjustment; Screen (G2), White Balance - Sony KD-28DX50U Service Manual

Layout of each control
V.STAT

3-3. Focus Adjustment

1. Receive a television broadcast signal.
2. Normalize the picture setting.
3. Adjust the focus control located on the flyback transformer
to obtain the best focus at the centre of the screen.
Bring only the centre area of the screen into focus, the
magenta-ring appears on the screen. In this case, adjust the
focus to optimize the screen uniformly.
Purity
BMC (Hexapole)
Focus
Screen

3-4. Screen (G2), White Balance

[Adjustment in the service mode using the remote
commander]
G2 adjustment
1. Input a dot signal from the pattern generator.
2. Set the Picture, Brightness and Colour to minimum.
3. Apply 165V DC from an external power supply to the R, G
and B cathodes of the CRT.
4. Whilst watching the picture, adjust the G2 control [SCREEN]
located on the flyback transformer to the point just before the
flyback return lines disappear.
White balance adjustment for TV mode
1. Input an all-white signal from the pattern generator.
2. Program the Remote Commander for operation in Service Mode.
[ See Page 23 ].
3. Enter into the 'Service Mode' by pressing 'VIDEO' button twice
and 'MENU' on the Service Commander.
4. Select 'Service' from the on screen menu display and press
'Right Arrow'.
5. The 'Service' menu will appear on the screen.[See Page 23]
6. Set the 'Contrast' to MAX.
7. Set the 'R-Drive' to 50.
8. Adjust the 'G-Drive' and the 'B-Drive' so that the white
balance becomes optimum.
9. Press the 'OK' button to write the data for each item.
10. Set the 'Contrast' to MIN.
11. Set the 'R-Cutoff' to 29.
12. Adjust the 'G-Cutoff', and the 'B-Cutoff' with the left and
right buttons on the remote commander so that the white
balance becomes optimum.
13. Press the 'OK' button to write the data for each item.
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