Adjustment Mode - LG 42PC51 Service Manual

12. Adjustment of White Balance
12-1. Purpose and Principle for adjustment
of the color temperature
(1) Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
(2) Principle : To adjust the white balance without the
saturation, Fix the one of R/G/B gain to 80 and decrease
the others.

12-2.Adjustment mode

: Two modes of Cool and Warm.(Medium data is
automatically calibrated by the cool data)
12-3. Required Equipment
(1) Remote control for adjustment.
(2) Color Analyzer.(CA-110 or same product) - CH : 10
(3) Auto W/B adjustment instrument.(only for Auto adjustment)
12-4. Connecting diagram of equipment for
measuring
(For Automatic Adjustment)
(1) Enter the DDC adjust mode.
- Enter the white balance adjustment mode at the same
time heat-run mode when pushing the power on by power
only key.
- Maintain the white balance adjustment mode with same
condition of Heat-run.
-> Maintain after AC off/on in status of Heat-run pattern display.
(2) Release the DDC adjust mode.
- Release the adjust mode after AC off/on or std-by off/on
in status of finishing the Hear-run mode.
- Release the Adjust mode when receiving the aging off
command(F3 00 00) from adjustment equipment.
- Need to transmit the aging off command to TV set after
finishing the adjustment.
* Standard color coordinate and temperature when using the
CA-110 or CA210 equipment.
Color Coordinate
Mode
x
COOL 0.276±0.002
MEDIUM 0.285±0.002
WARM 0.313±0.002
* Synchronization relation between PSM and CSM.
PSM CSM
Dynamic Cool
Standard
Normal
Mild
Warm
Temp
y
0.283±0.002 11,000K
0.293±0.002 9,300K
0.329±0.002 6,500K
Remark
(3) DDC adjustment support command set.
Adjustment
Aging On/Off
Input select
R GAIN
G GAIN
B GAIN
R GAIN
G GAIN
B GAIN
R GAIN
G GAIN
B GAIN
* R/G/B GAIN max value : 80
12-5. Adjustment of White Balance
(For Manual adjustment)
- Adjustment mode : Two modes of Cool (Dynamic) and
Warm(Mild).
(Medium data is automatically calibrated by the cool data)
- Color analyzer(CA110, CA210) should be used in the
calibrated ch by CS-1000.(PDP : CH10)
- Operate the zero-calibration of the CA-110 or CA-210, then
stick sensor to the module when adjusting.
- For manual adjustment, it is also possible by the following
sequence.
(1) Select RF no signal by pressing "POWER ON" key on
remote control for adjustment then operate heat run more
than 15 minutes.
(If not executed this step, the condition for W/B will be differ.)
(2) Changing to the av mode by pushing the input or front av
key.(av mode : av1 or av2 or av3)
(3) Display the internal pattern of the VCT-Pro IC by pushing
the IN-START.
(4) Stick sensor to center of the screen and select each items
(Red/Green/Blue Gain and Offset) using
uv
on R/C.
(5) Adjust R Gain / B Gain using
0.000
(6) Adjust two modes of Cool(Dynamic) and Warm(Mild) as
0.000
below figure.
(Fix the one of R/G/B and change the others)
0.003
1. Push the one time the in-start key : Dynamic(Cool)
2. Push the two more the in-start key : Mild(Warm)
Mode
COOL
MEDIUM
WARM
- 14 -
CMD(HEX) ADR VALUE
F3 00 FF/00
F4 00
16 00 00 - FE
00 - FE
18
1A 00 - FE
00 - FE
16 01
18 00 - FE
1A 00 - FE
00 - FE
16 02
18 00 - FE
00 - FE
1A
F G
/
Color Coordinate
x y
0.276±0.002 0.283±0.002
0.285±0.002 0.293±0.002
0.313±0.002 0.329±0.002
Detail
OO : OFF
01 : ON
FF : WB Ready
0x10 : TV
0x20 : AV1
0x21 : AV2
0x23 : AV3
0x40 : Component1
0x50 : RGB DTV
0x60 : RGB PC
0x90 : HDMI1 DTV
GAIN adjustment
CSM COOL
GAIN adjustment
CSM NORMAL
GAIN adjustment
CSM WARM
D E
/ (CH+/-) key
(VOL+/-) key on R/C.
Temp uv
11,000K 0.000
9,300K 0.000
6,500K
0.003