Read LG 22LF15R (CHASSIS:LP81K) Service Manual online
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5. Adjustment of White Balance
5-1. Purpose and Principle for adjustment
of the color temperature
- Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
- Principle : To adjust the white balance without the saturation,
Fix the one of R/G/B gain to C0 and decrease the
others.
others.
Adjustment mode : Two modes of Cool and Warm
(Medium data is automatically calibrated by the Cool data)
(Medium data is automatically calibrated by the Cool data)
5-2. Required Equipment
(1) Remote controller for adjustment
(2) Color Analyzer : CA100+ or CA-210 or same product
(2) Color Analyzer : CA100+ or CA-210 or same product
- LCD TV( ch : 9 ),
(3) Auto W/B adjustment instrument(only for Auto adjustment)
5-3. Connecting diagram of equipment for
measuring(For Automatic Adjustment)
(1) Enter the adjustment mode of DDC
1) Set command delay time : 50ms
2) Enter the DDC adjustment mode at the same time heat-
2) Enter the DDC adjustment mode at the same time heat-
run mode when pushing the power on by power only key
3) Maintain the DDC adjustment mode with same condition
of Heat-run ->Maintain after AC off/on in status of Heat-
run pattern display
run pattern display
(2) Release the DDC adjustment mode
1) Release the adjust mode after AC off/on or std-by off/on
in status of finishing the Hear-run mode
2) Release the Adjust mode when receiving the aging off
command(F3 00 00) from adjustment equipment
3) Need to transmit the aging off command to TV set after
finishing the adjustment.
4) Check DDC adjust mode release by exit key and release
DDC adjust mode
(3) Enter the adjust mode of white balance
- Enter the white balance adjustment mode with aging
command(F3, 00, FF)
* Luminance min value is 190cd/m2 in the cool mode (For LCD)
5-4. Adjustment of White Balance
(for Manual adjustment)
(1) Adjustment mode : Two modes (Cool and Warm)
(Medium data is automatically calibrated by the Cool data)
(2) Color analyzer(CA100+, CA210) should be used in the
calibrated ch by CS-1000 (LCD : CH9)
(3) Operate the zero-calibration of the CA100+ or CA-210,
then stick sensor to the module when adjusting.
(4) For manual adjustment, it is also possible by the following
sequence.
1) Select white pattern of heat-run by pressing “POWER
ON” key on remote control for adjustment then operate
heat run longer than 15 minutes. (If not executed this
step, the condition for W/B may be different.)
heat run longer than 15 minutes. (If not executed this
step, the condition for W/B may be different.)
2) Push “Exit” key.
3) Change to the AV mode by remote control.(Push front-
3) Change to the AV mode by remote control.(Push front-
AV or Input key)
4) Input external pattern(85% white pattern)
5) Push the ADJ key two times (entering White Balance
5) Push the ADJ key two times (entering White Balance
mode)
6) Stick the sensor to the center of the screen and select
each items (Red/Green/Blue Gain and Offset) using
D
/
E
(CH +/-) key on R/C.
7) Adjust R/ G/ B Gain using
F
/
G
(VOL +/-) key on R/C.
8) Adjust two modes (Cool and Warm)
(Fix the one of R/G/B and change the others)
9) When adjustment is completed, Exit adjustment mode
using EXIT key on R/C.
* CASE
- First adjust the coordinate far away from the target value(x, y).
(1) x, y > target
1) Decrease the R, G.
(2) x, y < target
1) First decrease the B gain,
2) Decrease the one of the others.
2) Decrease the one of the others.
- In case of decreasing the x, decreasing the R : fix G
- In case of decreasing the y , decreasing the G : fix R
- In case of decreasing the y , decreasing the G : fix R
(3) x > target, y < target
1) First decrease B, so make y a little more than the target.
2) Adjust x value by decreasing the R
2) Adjust x value by decreasing the R
(4) x < target , y > target
1) First decrease B, so make x a little more than the target.
2) Adjust x value by decreasing the G
2) Adjust x value by decreasing the G
A
Standard color coordinate and temperature when using the
CA100+ or CA210 equipment)
CA100+ or CA210 equipment)
Mode
Color coordinate
Temp
∆uv
X
Y
Cool
0.285±0.002
0.293±0.002
9,300K
0.000
Warm
0.313±0.002
0.329±0.002
6,500K
0.003
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