White Balance, Sub-Brightness And G2 Adjustments; White Balance Adjustment - Sony TRINITRON KD-34XBR2 Service Manual

SECTION 8. WHITE BALANCE, SUB-BRIGHTNESS AND G2 ADJUSTMENTS
Perform White Balance and Sub-brightness adjustments as necessary. Perform G2 adjustment whenever the CRT or D-board is replaced,
and whenever tinting or faint lines are seen in all-black areas of the screen.
Required equipment:
NTSC generator with white raster and gray-scale pattern (color bar pattern with chroma turned off is OK).
NOTE: Throughout these adjustment procedures you will be instructed to "Write the data to memory". To do this, follow this procedure:
1. Press the "MUTE" button ("WRITE" appears in green letters at the top right corner of the screen).
2. Press the "ENTER" button ("WRITE" changes from green to red, then "WRITE" changes to "SERVICE").

8-1. WHITE BALANCE ADJUSTMENT

SET-UP CONDITION:
Picture mode: PRO mode at factory default (press the RESET button
while in PRO mode adjustment menu), then set COLOR to 50%.
PROCEDURE:
1. Select the video-1 input.
2. Enter the service mode.
3. Set the following initial data:
Device Name Adj. Item #
2150P-1 4
2150P-1 7
2150P-1 1
2150P-1 2
2103-1 20
2103-1 21
2103-2 20
2103-2 21
4. Display a gray-scale pattern (or color bars with the chroma turned
off) and closely observe the 2 darkest gray bars (not including the
black bar).
5. Display a white raster again, and adjust the pattern generator's output
level so that raster level is in the middle of the level of the 2 darkest
gray bars observed in the previous step.
Name Data
RDRV 45
RCUT 41
CBOF 34
CROF 32
CBOF 34
CROF 32
CBOF 33
CROF 33
— 31 —
6. Alternately adjust category 2150P-1 items # 8 "GCUT" and 9 "BCUT"
to obtain the purest gray (no color tint). Use the center area of the
screen to make your judgment.
7. Write the data to memory.
8. Display a 480i (NTSC) white raster through the video-1 input.
9. Alternately adjust category 2150P-1 items # 5 "GDRV" and 6 "BDRV"
to obtain the purest white (no color tint). Use the center area of the
screen to make your judgment.
10. Write the data to memory.
11. Alternately repeat steps 6 through 9 until the dark gray and white
rasters do not show any evidence of color tinting.
12. Write the data to memory.
13. Change the set from the video-1 mode to the DTV mode as follows:
a) Turn the set on and select the VHF-UHF antenna.
b) Tune the TV to channel 2.1 ("two point one" not "twenty one"). Use
the decimal point button on the remote. It's OK if there is no signal
on channel 2.1.
c) Turn the TV off.
d) Enter the service mode.
14. Change white balance offset data for the DTV mode as follows:
Device Name Adj. Item #
2150P-1 1
2150P-1 2
15. Write the data to memory.
16. Change the set from DTV mode to TWIN (P&P) mode.
17. Change white balance offset data for the TWIN mode as follows:
Device Name Adj. Item #
2150P-1 1
2150P-1 2
18. Write the data to memory.
19. Change the set from TWIN mode to video-5 mode. An input signal
is not necessary.
KD-34XBR2
Name Data
CBOF 26
CROF 26
Name Data
CBOF 36
CROF 36