White Balance Adjustment - LG 50LN54 Series Service Manual

4. Total Assembly line process

4.1. White Balance adjustment

▪ W/B Equipment condition
CA210 : LED -> CH14, Test signal: Inner pattern(80IRE)
▪ Above 5 minutes H/run in the inner pattern. ("power on" key
of adjust remote control)
▪ If it is executed W/B adjustment in 2~3 minutes H/run, it is
adjusted by Target data.
(For OS LED / Direct LED module)
Mode Temp
Cool 13,000 K
Medium 9,300 K
Warm 6,500 K
▪ Normal line
Aging time
NetCase4 X
(Min)
269
1 0-2 280
2 3-5 279
3 6-9 277
4 10-19 276
5 20-35 274
6 36-49 272
7 50-79 271
8 80-119 270
9 Over 120 269
* Aging chamber
Aging time
NetCase4 X
(Min)
269
1 0-2 276
2 3-5 274
3 6-9 273
4 10-19 272
5 20-35 271
6 36-49 270
7 50-79 266
8 80-119 264
9 Over 120 263
* Connecting picture of the measuring instrument
(On Automatic control)
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push Adjustment R/C POWER ON →
Enter the mode of White-Balance, the pattern will come out.
Full White Pattern
RS-232C Communication
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Coordinate spec Target
X=0.269 (±0.002) X=0.271
Y=0.273 (±0.002) Y=0.276
X=0.285 (±0.002) X=0.287
Y=0.293 (±0.002) Y=0.296
X=0.313 (±0.002) X=0.315
Y=0.329 (±0.002) Y=0.332
Cool Medium Warm
y x y x
273 285 293 313
287 296 307 320
285 295 305 319
284 293 304 317
283 292 303 316
280 290 300 314
277 288 297 312
275 287 295 311
274 286 294 310
273 285 293 309
Cool Medium Warm
y x y x
273 285 293 313
282 292 302 316
280 290 300 314
278 289 298 313
276 288 296 312
274 287 294 311
272 286 292 310
269 282 289 306
267 280 287 304
266 279 286 303
CA-210
COLOR
ANALYZER
TYPE : CA-210
* Auto-control interface and directions
(1) Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10 lux).
(2) Adhere closely the Color analyzer(CA210) to the module
less than 10 cm distance, keep it with the surface of the
Module and Color analyzer's prove vertically.(80° ~ 100°).
(3) Aging time
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 5 minutes.
- Using 'no signal' or 'POWER ONLY' or the others, check
the back light on.
▪ Auto adjustment Map(using RS-232C to USB cable)
RS-232C COMMAND
[CMD ID
Wb 00
Wb 00
RS-232C COMMAND
[CMD ID DATA]
Cool Mid
y
R Gain jg Ja
329
G Gain jh Jb
337
B Gain ji Jc
335
R Cut
334
333
G Cut
330
B Cut
327
325
<Caution>
Color Temperature : COOL, Medium, Warm.
324
One of R Gain/G Gain/ B Gain should be kept on 0xC0, and
323
adjust other two lower than C0.(When R/G/B Gain are all
C0, it is the FULL Dynamic Range of Module)
y * Manual W/B process using adjust Remote control.
329
▪ After enter Service Mode by pushing "ADJ" key,
▪ Enter White Balance by pushing " ► " key at "8. White
332
Balance".
330
EZ ADJUST
328
0. Tool Option1
326
1. Tool Option2
324
2. Tool Option3
3. Tool Option4
322
4. Tool Option5
5. Tool Option Commercial
319
6. Country Group
317
7. Area Option
8. ADC Calibration
316
9. White Balance
10. 10 Point WB
11. Test Pattern
12 EDID D/L
13. Sub B/C
14. Ext. Input Adjust
* CASE Cool Mode
First adjust the coordinate far away from the target
value(x, y).B.
1) x, y > target
2) x, y < target
3) x >target, y < target
4) x < target, y > target
- Every 4 case have to fit y value by adjusting B Gain
and then fit x value by adjusting R-Gain.
- In this case, increasing/decreasing of B Gain and R
Gain can be adjusted.
- 12 -
DATA]
00 White Balance Start
ff White Balance End
CENTER
(DEFAULT)
MIN
Warm Cool Mid
jd 00 172 192
je 00 172 192
jf 00 192 192
64 64
64 64
64 64
Whit Balance
Color Temp.
R-Gain
G-Gain
B-Gain
R-Cut
G-Cut
B-Cut
Test-Pattern
Backlight
Reset
LGE Internal Use Only
MAX
Warm
192 192
192 192
172 192
64 128
64 128
64 128
◄ ►
Cool
172
172
192
64
64
64
ON
100
To Set