Final Assembly Adjustment; White Balance Adjustment - LG 49UF6700 Service Manual

5. Final Assembly Adjustment

5.1. White Balance Adjustment

5.1.1. Overview
5.1.1.1. W/B adj. Objective & How-it-works
(1) Objective: To reduce each Panel's W/B deviation
(2) How-it-works: When R/G/B gain in the OSD is at 192, it
means the panel is at its Full Dynamic Range.
● Case : Cool Mode
- To adjust the white balance without the saturation, G gain
should be adjust at least 172 and change the others (R,B
Gain)
▪ When R or B gain is over 255, G gain can be adjust below
172)
● Case : Medium / Warm Mode
- To adjust the white balance without the saturation, Fix the
one of R/G/B gain to 192 (default data) and decrease the
others.
(3) Adj. condition: normal temperature
- Surrounding Temperature: 25 ± 5 °C
- Warm-up time: About 5 Min
- Surrounding Humidity: 20% ~ 80%
- Before White balance adjustment, Keep power on status,
don't power off
5.1.1.2. Adj. condition and cautionary items
(1) Lighting condition in surrounding area surrounding lighting
should be lower 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
(90 ° ± 2.5 °)
(3) Aging time
- After Aging Start, Keep the Power ON status during 5
Minutes.
- In case of LCD, Back-light on should be checked using no
signal or Full-white pattern.
5.1.2. Equipment
(1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED:
CH14)
(2) Adj. Computer (During auto adj., RS-232C protocol is
needed)
(3) Adjust Remocon
(4) Video Signal Generator MSPG-925F 720p/204-Gray
(Model: 217, Pattern: 49)
→ Only when internal pattern is not available
※ Color Analyzer Matrix should be calibrated using CS-1000
5.1.3. Equipment connection
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5.1.4. Adjustment Command (Protocol)
(1) RS-232C Command used during auto-adj.
RS-232C COMMAND
CMD DATA ID
Wb 00 00
Wb 00
(2) Adjustment Map
Adj. item Command
Cool R Gain
G Gain
B Gain
Medium R Gain
G Gain
B Gain
Warm R Gain
G Gain
B Gain
5.1.5. Adjustment method
5.1.5.1. Auto WB calibration
(1) Set TV in ADJ mode using P-ONLY key (or POWER ON
key)
(2) Place optical probe on the center of the display
- It need to check probe condition of zero calibration before
adjustment.
(3) Connect RS-232C Cable
(4) Select mode in ADJ Program and begin a adjustment.
(5) When WB adjustment is completed with OK message,
check adjustment status of pre-set mode (Cool, Medium,
Warm)
(6) Remove probe and RS-232C cable.
▪ W/B Adj. must begin as start command "wb 00 00" , and
finish as end command "wb 00 ff", and Adj. offset if need
5.1.5.2. Manual adjustment
(1) Set TV in Adj. mode using POWER ON
(2) Zero Calibrate the probe of Color Analyzer, then place it on
the center of LCD module within 10cm of the surface..
(3) Press ADJ key → EZ adjust using adj. R/C → 8. White-
Balance then press the cursor to the right (KEY►).
(When KEY(►) is pressed 204 Gray(80IRE) internal
pattern will be displayed)
(4-a) Adjust modes (Cool) : Fix the G gain at least 172 and
change the others (R/B Gain).
▪ If R or B gain is over 255, G gain can be adjust below 172.
(4-b) Adjust two modes ( Medium / Warm) : Fix the one of
R/G/B gain to 192 (default data) and decrease the others
- 13 -
Explanation
Begin White Balance adj.
ff End White Balance adj.
(internal pattern disappears )
Data Range
(lower caseASCII) (Hex.)
CMD1 CMD2 MIN
j g 00
j h 00
j i 00
j a 00
j b 00
j c 00
j d 00
j e 00
j f 00
LGE Internal Use Only
MAX
C0
C0
C0
C0
C0
C0
C0
C0
C0