Panasonic TH-50PV70L, Service Manual

Page: 33 / 143

12.2. PAL panel white balance adjustment
Instrument Name Connection Remarks
· W/B pattern (PAL-M or NTSC)
·
Color analyzer (Minolta CA-100 or equivalent)
RF input
Panel surface User setting: Normal
Procedure Remarks
· Asing time is longer than 15min.
· 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.
Complete the adjustment within 10 minutes after the turn on electricity.
Turn on the power supply again when it is not possible to complete it by aging etc.
1. Display the white balance pattern.
2. Enter the Service mode.
3. A number key “1” and “2” are operated and “WB-ADJ” is displayed.
Check that the color balance is “HIGH”.
4. Select “G-CUTOFF” item, using the number-key “3” or “4”, and set to “80”, using the volume-
key “+” or “-”.
Also, “B-CUTOFF” and “R-CUTOFF” set to “80”.
5. Set “G-DRIVE” at “D0”.
6. Touch the signal receiver of color analyzer to the highlight window’s center, and adjust B
drive and R drive so x, y become the “COLOR TEMP HIGH” in the below table.
7. All RGB drive increase so that the maximum drive value of RGB may become “FC”.
(“ALL-DRIVE” set to “FC”.)
8. Set color balance to NORMAL using “7” key.
9. Fix G cutoff , B cutoff and R cutoff at “80”.
10. Fix G drive at “D0”.
11. Adjust B drive and R drive so the highlight window’s x, y become the “COLOR TEMP
NORMAL” in the below table.
12. All RGB drive increase so that the maximum drive value of RGB may become “FC”.
(“ALL-DRIVE” set to “FC”.)
13. Set color balance to “LOW” using “7” key.
14. Fix G cutoff, B cutoff and R cutoff to “80”.
15. Fix G drive to “D0”.
16. Adjust B drive and R drive so the highlight window’s x, y become the “COLOR TEMP LOW”
shown in the below table.
17. All RGB drive increase so that the maximum drive value of RGB may become “FC”.
(“ALL-DRIVE” set to “FC”.)
Picture menu : Dynamic
ASPECT : 16:9
· Highlight section
Signal amplitude 75%
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TH-50PV70L