LG 55LH85 - - 54.6" LCD TV, Service Manual, Page: 13 / 76

5.2. White Balance Adjustment
5.2.1 Overview
• W/B adj. Objective & How-it-works
- Objective: To reduce each Panel’s W/B deviation
- How-it-works: When R/G/B gain in the OSD is at 192, it
means the panel is at its Full Dynamic
Range. In order to prevent saturation of
Full Dynamic range and data, one of
R/G/B is fixed at 192, and the other two is
lowered to find the desired value.
5.2.2 Equipment
1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12)
2) Adj. Computer(During auto adj., RS-232C protocol is
needed)
3) Adjust Remocon
4) Video Signal Generator MSPG-925F 720p/216-Gray
(Model:217, Pattern:78)
-> Only when internal pattern is not available
• Color Analyzer Matrix should be calibrated using CS-1000
5.2.3 Equipment connection
5.2.4 Adj. Command (Protocol)
- LEN : Number of Data Byte
- CMD : Command
- VAL : Value of FOS Data
- CS : Checksum
- A : Acknowledge
Ex) [Send: JA_00_DD] / [Ack: A_00_okDDX}
• RS-232C Command(Automatic adjustment)
Ex) wb 00 00 : Start Auto-adjustment of white balance.
wb 00 10 : Start Gain Adjustment (Inner pattern)
ja 00 ff : Adjustment data
jb 00 c0 :
…
…
wb 00 1f : End of Gain adjustment
* (wb 00 20(start), wb 00 2f(end)) -> In the case of Off-
set adjustment
wb 00 ff : End of white balance adjustment
• Adjustment Map
- 13 - LGE Internal Use Only Copyright LG Electronics. Inc. All right reserved.
Only for training and service purposes
Co lo r An alyzer
Co m p ut er
Pat t ern Gen erat o r
RS -232C
RS -232C
RS -232C
Probe
Signal Source
* If TV internal pattern is used, not needed
Connection Diagram of Automatic Adjustment
START 6E 50 03 00 CS LEN CMD VAL STOP A A A A A A A A
RS-232C COMMAND
Meaning
[CMD ID DATA]
wb 00 00 White Balance adjustment start.
wb 00 10 Start of adjust gain (Inner white pattern)
wb 00 1f End of gain adjust
wb 00 20 Start of offset adjust(Inner white pattern)
wb 00 2f End of offset adjust
wb 00 ff End of White Balance adjust(Inner pattern disappeared)
ITEM Command Data Range Default
(Hex.) (Decimal)
Cmd 1 Cmd 2 Min Max
Cool R-Gain j g 00 C0 TBD
G-Gain j h 00 C0 TBD
B-Gain j i 00 C0 TBD
R-Cut TBD
G-Cut TBD
B-Cut TBD
Medium R-Gain j a 00 C0 TBD
G-Gain j b 00 C0 TBD
B-Gain j c 00 C0 TBD
R-Cut TBD
G-Cut TBD
B-Cut TBD
Warm R-Gain j d 00 C0 TBD
G-Gain j e 00 C0 TBD
B-Gain j f 00 C0 TBD
R-Cut TBD
G-Cut TBD