26LF15R (CHASSIS:LP81A) - LG TV Service Manual (repair manual). Page 11

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* Before HDCP Download, you have to Set the Configuration

that CMD delay.
-> Configuration -> Option-> I2C delay(Write Byte : 0.5 ms,
Read Byte : 0.5ms, Read CMD Byte : 0.5ms)

* Change the DDC -> After Write Data delay Time 20ms ,also

Change the After Send Read Command delay Time 20ms.

* Check the Communication Clock -> 45KHz.

(1) Connect D-sub Signal Cable to D-Sub Jack
(2) Input HDCP key with HDCP-key- in-program
(3) HDCP Key value is stored on EEPROM(AT24C64) which

is From “0x80” addresses of 0xA0 page

(4) AC off/ on and on HDCP button of MSPG925 and confirm

whether picture is displayed or not of using MSPG925

(5) HDCP Key value is different among the sets.

- 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.

- Adjustment mode : Two modes - Cool and Warm

(Medium data is automatically calibrated by the Cool data)

1) Remote controller for adjustment 
2) Color Analyzer : CA100+ or CA-210 or same product (ch:9)
3) Auto W/B adjustment instrument(only for Auto adjustment)

(1) Connecting diagram of equipment for measuring (For

Automatic Adjustment

1) Enter the adjustment mode of DDC

- Set command delay time : 50ms
- Enter the DDC adjustment mode at the same time

heat-run mode when pushing the power on by power
only key

- Maintain the DDC adjustment mode with same

condition of Heat-run (Maintain after AC off/on in status
of Heat-run pattern display)

2) Release the DDC adjustment 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.

- 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 200cd/m

2

≥ in the cool mode (For LCD)

(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, PDP : CH10)

(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.)

2) Push “Exit” key.
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

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.

(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

(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

- Standard color coordinate and temperature when using the

CA100+ or CA210 equipment

To check the Coordinates of White Balance, you have to
measure at the below conditions.
Picture Mode : User 1
XD : Manual – XD Contrast : Off, XD Colour : Off
(If you miss the upper condition, the coordinates of W/B can
be lower than the spec.)

Mode

Color coordinate

Temp

∆uv

X

Y

Cool

0.276±0.002

0.283±0.002

11,000K 0.000

Warm

0.313±0.002

0.329±0.002

6,500K

0.003