Panasonic CT-30WX54J Service Manual page 169

15.9.28 (1080i full)
V-S, V-Size adjustment
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PREPARATION
1. Use a pattern that permits centering the image
2. Apply a 1080i pattern
3. Set mode to 4x3 in set-up menu
4. Normalize the picture settings.
5. Set picture mode to VIVID
PROCEDURE
1. Enter to service mode
2. Adjust VAMP to correct vertical size.
3. Check a and b sizes, If b-a < -1.5mm (in top and bottom extending case)
Increase V-S DATA by one step
Adjust VEAMP to correct vertical size.
NOTE
Repeat until b-a ± 1.5mm
4. Check a and b sizes, If b-a > -1.5mm (in top & bottom shortening case)
Decrease V-S by one step.
Adjust VEAMP to correct vertical size
NOTE