White Balance Adjustment - Panasonic PT-53X54J Service Manual

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17.12 White balance adjustment

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NOTE:
Use a 7 gray step pattern in this adjustment. This pattern can be obtained from a NTSC generator applying a bar signal
without color.
This adjustment requires the service user skills in observing what a screen without color should look like (white picture).
Preparation:
1. Set the following in the user picture menu as follows:
PIC MODE to VIVID
COLOR to minimum (0)
PICTURE to max (63)
BRIGHT to center (31)
SHARPNESS to minimum (0)
TINT to center (31)
NATURAL COLOR to OFF
COLOR TEMPERATURE to COOL
1. Enter service mode.
2. Apply a black and white pattern to one of the video inputs (see above note) color bar with no color.
3. Enter service mode menu, select C_OFF register and change value from 00 to 01 to display green color only.
4. Adjust screen VR until bars with 7 and 5 IRE do not have any difference tone between them.
5. Select C_OFF register and change value from 01 to 02 to display red color only.
6. Adjust screen VR until bars with 7 and 5 IRE do not have any difference tone between them.
7. Select C_OFF register and change value from 02 to 03 to display blue color only.
8. Adjust screen VR until bars with 7 and 5 IRE do not have any difference tone between them.
9. Select C_OFF register and change value from 03 to 03 to display all three colors and check white color.
17.12.1 High light white balance adjustment
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Gray bar pattern.