Panasonic TX-PR50VT20, Sevice Manual

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10.1.3. THX White balance adjustment
Name of measuring instrument Connection Remarks
W/ B pattern
Color analyzer
(Minolta CA-100 or equivalent)
Panel surface
Steps Remarks
Make sure the front panel to be used on the final set is fitted.
Make sure a color signal is not being shown before adjustment.
Put the color analyzer where there is little colour variation. Picture menu : Dynamic
ASPECT : 16:9
Adjustment Remarks
1. Enter the service mode.
Please receive the external signal. Or, please select CVBS/YUV (no sync).
2. A number key [1] or [2] are operated and [WB-ADJ] is displayed.
Check that the color balance is [ COOL ].
3. A number key [0] is operated and select [METHOD=01].
4. A number key [5] is operated and [INNER PATTERN] is displayed.
METHOD=01
copy adjustments
5. Select [G-CUTOFF] item, using the number-key [3] or [4], and set to [80], using the vol­
ume-key [+] or [-].
Also, [B-CUTOFF] and [R-CUTOFF] set to [80]
6. Set [G-DRIVE] at [D0].
7. Touch the signal receiver of color analyzer to the INNER PATTERN's center, and adjust B
drive and R drive so x, y become the [COLOR TEMP COOL] in the below table1.
8. All RGB drive increase so that the maximum drive value of RGB may become [FF].
([ALL-DRIVE] set to [FF].)
9. Set color balance to [NORMAL] using [7] key.
10. Fix G-CUTOFF, B-CUTOFF and R-CUTOFF at [80].
11. Set [G-DRIVE] at [D0].
12. Adjust B-DRIVE and R-DRIVE so the INNER PATTERN's x, y become the [COLOR
TEMP NORMAL] in the below table1.
13. All RGB drive increase so that the maximum drive value of RGB may become [FF].
([ALL-DRIVE] set to [FF].)
14. Set color balance to [WARM] using [7] key.
15. Set Picture menu to [CINEMA] using [9] key.
16. A number key [5] is operated and [THX PATTERN] is displayed.
17. Fix G-CUTOFF, B-CUTOFF and R-CUTOFF at [80].
18. Set [G-DRIVE] at [D0].
19. Adjust B-DRIVE and R-DRIVE so the INNER PATTERN's x, y become the [COLOR
TEMP WARM] in the below table1.
20. All RGB drive increase so that the maximum drive value of RGB may become [FF].
([ALL-DRIVE] set to [FF].)
Table 1, Color temp, target value
COLORTEMP
X У
COOL
0.277 0.279
NORMAL
0.297 0.310
WARM
0.313 0.329
THX
Adjustment target + - 0.003
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