37LH40, 37LH41 (CHASSIS:LA92G) - LG TV Service Manual (repair manual). Page 17

C

2009

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• RS-232C Command used during auto-adjustment

Ex) wb 00 00 -> Begin white balance auto-adj.

wb 00 10 -> Gain adj.
ja 00 ff -> Adj. data
jb 00 c0
...
...
wb 00 1f -> Gain adj. complete
*(wb 00 20(Start), wb 00 2f(End)) -> Off-set adj.

wb 00 ff -> End white balance auto-adj.

5.2.5 Adjustment method

5.2.5.1 Auto adjustment method

1) Set TV in adj. mode using POWER On Key

2) Zero calibrate probe then place it on the center of the

Display

3) Connect Cable(RS-232C)
4) Select mode in adj. Program and begin adj.
5) When adj. is complete (OK Sign), check adj. status per

mode (Warm, Medium, Cool)

6) Remove probe and RS-232C cable to complete adj.

• adj. must begin w/ command “Wb 00 00”, and end w/”wb

00 ff” and adjustment offset if needed.

5.2.5.2 Manual adj. method

1) Set TV in adj. mode using POWER On Key
2) Press ADJ key Æ EZ adjust using adj. R/C
3) Using CH + / - KEY, select 7.TEST PATTERN then press

Enter to place inHEAT RUN mode and wait for 5
minutes.

4) Zero calibrate the probe of Color Analyzer, then place it

on the center of LCD module within 10 cm of the surface.

5) Press ADJ key Æ 6. White-Balance then press the cursor

to the right (KEY

)

(When

is pressed Full White internal pattern will be

displayed)

6) One of R Gain / G Gain / B Gain should be fixed at 192,

and the rest will be lowered to meet the desired value.

7) Adjustment is performed in COOL, MEDIUM, WARM 3

modes of color temperature

• If internal pattern is not available, use RF input(Full white

216 gray) In EZ Adjustment menu 6.White Balance, you
can select one of 2 options: Test pattern ON, Test pattern
OFF. Default is “ON” By selecting “OFF”, you can adjust
using RF signal.

• Adjustment condition and cautionary items

1) Lighting condition in surrounding area Surrounding

lighting should be lower than 10 lux.

Try to isolate adj. area into dark surrounding.

2) Probe location

- Color Analyzer (CA-210) probe should be within 10cm

and perpendicular of the module surface (80°~ 100°)

- B/L on should be checked using no signal or Full white

Pattern

5.2.6 Reference 

(White Balance adj. coordinate and color temperature)

• Luminance: Full white 216 Gray
• Standard color coordinate and temperature using CS-1000

• 37/42/47LH40-UA (N-America)

Standard color coordinate and temperature using CA-210(CH 09) 

5.3 Manual V-Com adjustment Method

* V-Com needs to be adjusted.(Default value is “450”)

1) Set TV in adj. mode using POWER On Key
2) Press ADJ key -> EZ adjust using adj. R/C
3) Using CH + / - KEY, select “10.V-Com”
4) Store the optimized default value “440” if there is not flicker

on the picture.

5) But is there flicker on the picture, Adjust V-Com using VOL

+ / - KEY

6) Stop adjusting V-Com if green pattern doesn’t show flicker.

and then stored current value and exit.

5.4 Option selection per country

America due to rating

• Applied model: LA92G Chassis applied None USA

Model(Canada, Mexico)

5.4.2 Method
1) Press ADJ key on the Adjustment R/C, then select Country

Group Menu

2) Depending on destination, select KR or US, then on the

lower option, select US, CA, MX. Selection is done using
+, - KEY

Coordinate 

Mode 

x y 

Temp uv

∆

Cool 0.276 0.283  11000K  0.0000

Medium 0.285  0.293 

9300K 

0.0000

Warm 0.313  0.329 

6500K  0.0000

Coordinate 

Mode 

x y 

Temp uv

∆

Cool 0.276±0.002 0.283±0.002 11000K 0.0000

Medium 0.285±0.002  0.293±0.002 

9300K 

0.0000

Warm 0.313±0.002  0.329±0.002  6500K  0.0000

EZ ADJUST

0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Country Group
5. ADC Calibration
6. White Balance
7. Test pattern

8. EDID D/L

9. Sub B/C

10. V-Com

11. P-Gamma

CMD

ID DATA

Explanation

wb 

00 

00 

Begin White Balance adj.

wb

00 

ff

End White Balance adj. 

(internal pattern disappears)