White Balance Adjustment; Initialization; Ad Calibration; White Balance - Sony FWD-50PX3 Service Manual

2-2. White Balance Adjustment

2-2-1. Initialization

Initialize all information stored in EEPROM.
1. Start the service mode. (Refer to Section 2-1-1.)
2. Select Initialization menu and run FILL 0xFF.
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When the setting is completed, the unit becomes ON
state automatically after power ON/OFF.

2-2-2. AD Calibration

1. Start the service mode. (Refer to Section 2-1-1.)
2. Select the "Source" menu. Input the "Component",
"RGB", "Video" and "YUV" color bar signal respec-
tively, and then perform the AD calibration adjust-
ment.

2-2-3. White Balance

After aging the set about 30 min., adjust color matrix of
each color temperature 11000K/9300K/6500K.
Preparation for adjustment
Required equipment
. Signal generator (ex: VG-828)
. Color analyzer (ex: CS1000)
Signals
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If want to know detail timing. Refer to Sony Timing Spec.
. PC WXGA (1360 x 768@60 Hz)
. 1080I (Y/Pb/Pr)
. 480P (Y/Pb/Pr)
. PAL composite
Signal level
700 mV p-p
Signal pattern
. 255-level (75IRE) full white pattern
FWD-50PX3
Color matrix adjustment
Run the following program sequence in order PC → 1080i
→ 480p → Composite.
1. After input each signal, adjust Sub Offset.
. Input 16-Gray Pattern.
. Start the service mode and select White Balance
menu.
. Change SUB-OFFSET and adjust Brightness of 2/16
gray level into under 0.8cd/m
(SUB-OFFSET: ± 10)
2. Input Full White Pattern.
3. Setup R-GAIN and R/G/B-OFFSET values of the
WHITE BALANCE menu into the following TABLE
value.
PC
R Gain 33
G Gain 32
B Gain 31
R Offset 61
G Offset 60
B Offset 63
4. Change G-GAIN and B-GAIN values and adjust color
matrix. (Refer to Sony Color Matrix Spec.)
11000K: x = 276 (± 15), y = 282 (± 15)
9300K: x = 283 (± 15), y = 298 (± 15)
6500K: x = 313 (± 15), y = 329 (± 15)
5. Adjust each color temperature 11000K/9300K/6500K
in order repeating steps 3 and 4.
Shipment condition setting
Set up the shipment condition.
1. Start the on service mode.
(Refer to Section 2-1-1.)
2. After selecting For Test menu, run Init Good.
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When the setting is completed, the unit becomes ON
state automatically after power ON/OFF.
2
.
1080i 480p PAL
34 34 34
33 33 33
32 32 32
61 61 61
60 60 60
63 63 63
2-3