LG du-37lz30 Service Manual page 10

4.3 Adjust Color Temperature (White Balance)
(1) Devices Used
`
Color analyzer (CA-100 or equivalent)
Automatic adjustment device (Necessary for automatic adjustment. Should
be compatible with RS-232C communication.)
AV pattern generator
(2) Instrument Interconnection (For automatic adjustment)
High Light Adjustment
High Light Adjustment
RS-232C
(3) Method of Adjustment
Perform zero calibration on CA-100, which should remain perfectly
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attached to the LCD module surface during adjustment
Manual adjustment should be done in the following sequence.
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1) Press the Power On remote controller key.
2) Press the IN-START remote controller key. Then, select '4. UART
Control' to see if the baud rate is 115200.
3) Press the ADJ remote controller key to enter the 'Ez Adjust' mode.
4) Select '7. WHITE PATTERN' using CH + / - key and press the OK key
for a heat run longer than 15 minutes.
5) The AV Pattern Generator supplies the Window pattern signal. (external
input mode)
6) Set the image control state to "Normal image."
7) Put the sensor close to the center of the screen and press the ADJ
remote controller key. Then, select '5. White-Balance' in 'Ez Adjust' and
press the right arrow key (▶) to start the adjustment mode.
8) Adjust High Light using R Gain / B Gain.
9) Use the volume + or – key for adjustment.
(G Gain: 127 / R Cut: 63 are the fixed value.)
Brightness value: High Light = 150± 10 Cd
Color coordinate: X = 0.271 ±0.003, Y = 0.279 ±0.003
Color temperature: 12,000。 K ±500。 K
10) Press the OK (■) key to move to the 'Ez Adjust' screen when
adjustment is completed. Then, press the ADJ key to exit from the
adjustment mode.
4.4 Adjust Main and Sub Color
This adjustment will reduce color difference between the main and sub
displays in PIP, POP, and SPLIT screen modes.
1) Input the in-house signal, wait one second or longer after signal
reception, get to 'Ez-Adjust'by pushing ADJ KEY, select '2.
VPX3226' and get to the adjustment mode by pushing the right-hand
side (▶) key.
2) Get to the adjustment mode, and the display will automatically become a
TV 6CH SPLIT screen. A window will appear as follows.
COLOR
ANALYZER
TYPE; CA-100
CVBS Signal Input
LCD TV
Window
MSPG-2100 or
MSTG-5200
<Fig .2>
VPX3226
1. Contrast(MAIN) ◀ 31▶
2. Contrast(Sub) ◀ 31▶
US 6CH
3) At first adjust '1. Contrast (Main)' in such a way that the characters "US
6CH"on the left-hand side of the main display are most distinct and
clear (and not saturated), and then
Adjust '2. Contrast (Sub)' in such a way that the brightness of the sub
display on the right-hand side is the same as the main display. Use the
volume＋/- key for adjustment.
4) When adjustment is completed, escape adjustment mode by pushing
ADJ KEY.
※SERVICE OPTION DEFAULT
EZ ADJUST
1. AD9883A-Set
2. VPX3226
3. White-Balance
4. DVCO-Set
5. White-Pattern
1. AD9883A-Set
R-Gain adjustment value (default 128)
G-Gain adjustment value (default 128)
B-Gain adjustment value (default 128)
R-Offset adjustment value (default 64)
G-Offset adjustment value (default 64)
B-Offset adjustment value (default 64)
2. VPX3226
Contrast(Main)
Contrast(Sub)
3. White Balance
R-Gain adjustment value (default 127)
G-Gain adjustment value (default 127)
B-Gain adjustment value (default 127)
R-Cut adjustment value (default 63)
G-Cut adjustment value (default 63)
B-Cut adjustment value (default 63)
4. DVCO-Det
5. White-Pattern
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US 6CH
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31