Panasonic PT-53X54J Service Manual page 51

5. Enable digital convergence by changing DAC MUTE from 01 to 00.
6. Set VIDEO "C_OFF" DAC from 01 to 00.
17.5. Vertical linearity adjustment (V-C and V-S)
This adjustment is intended to make the picture vertically proportional (top, center and bottom)
NOTE:
1080i, 480p, 480i pattern can be obtained from Panasonic's TU-DST51 set-top box DTV decoder.
1. Apply a pattern that lets adjust the image to correct vertical
linearity (see above note).
2. Set VIDEO "C_OFF" DAC from 00 to 01 (to project only green).
3. Set DAC MUTE from 00 to 01 (disabling digital convergence).
4. Adjust centering magnets so that the center of the pattern get
aligned with screen frame center.
5. Adjust VDEF "V-C" and "V-S" DAC until vertical size is
proportional on top and bottom. Confirm to correct linearity in the
middle of the screen.
6. Set DAC MUTE from 01 to 00 (disabling digital convergence).
7. Set VIDEO "C_OFF" DAC from 01 to 00.
17.6. Vertical size adjustment (V-AMP)
This adjustment is intended to correct the vertical size of the picture.
NOTE:
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