LG Electronics 47LM765S/765T White Balance Adjustment, Overview, Equipment, Adj. Command Protocol

4.2. White Balance Adjustment

4.2.1. Overview

▪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. 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.

(3)Adjustment condition : normal temperature

1)Surrounding Temperature : 25 °C ± 5 °C

2)Warm-up time: About 5 Min

3)Surrounding Humidity : 20 % ~ 80 %

4.2.2. Equipment

(1)Color Analyzer: CA-210 (LED Module : CH 14)

(2)Adjustment Computer(During auto adj., RS-232C protocol is needed)

(3)Adjustment Remote control

(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-100.

4.2.3. Equipment connection MAP

		Color Analyzer
Probe		RS-232C
		Computer
	RS -232C	RS-232C
		Pattern Generator
	Signal Source
	* If TV internal pattern is used, not needed

4.2.4. Adj. Command (Protocol)

<Command Format>

START 6E A 50 A LEN A 03 A CMD A 00 A VAL A CS STOP

-LEN: Number of Data Byte to be sent

-CMD: Command

-VAL: FOS Data value

-CS: Checksum of sent data

-A: Acknowledge

Ex) [Send: JA_00_DD] / [Ack: A_00_okDDX]

▪ RS-232C Command used during auto-adjustment.

RS-232C COMMAND			Explantion
[CMD	ID	DATA]
wb	00	00	Begin White Balance adjustment
wb	00	10	Gain adjustment(internal white pattern)
wb	00	1f	Gain adjustment completed
wb	00	20	Offset adjustment(internal white pattern)
wb	00	2f	Offset adjustment completed
wb	00	ff	End White Balance adjustment
			(internal pattern disappears )

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. completed

*(wb 00 20(Start), wb 00 2f(end)) → Off-set adj. wb 00 ff → End white balance auto-adj.

▪ Adj. Map

	Adj. item	Command		Data Range		Default
		(lower caseASCII)		(Hex.)		(Decimal)
		CMD1	CMD2	MIN	MAX
	R Gain	j	g	00	C0
	G Gain	j	h	00	C0
Cool	B Gain	j	i	00	C0
	R Cut
	G Cut
	B Cut
	R Gain	j	a	00	C0
	G Gain	j	b	00	C0
Medium	B Gain	j	c	00	C0
	R Cut
	G Cut
	B Cut
	R Gain	j	d	00	C0
	G Gain	j	e	00	C0
Warm	B Gain	j	f	00	C0
	R Cut
	G Cut

4.2.5. Adj. method

(1)Auto adj. method

1)Set TV in adj. mode using P-Only key.

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

3)Connect Cable.(RS-232C to USB)

4)Select mode in adj. Program and begin adj.

5)When adj. is complete (OK Sign), check adj. status pre mode. (Warm, Medium, Cool)

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

▪W/B Adj. must begin as start command “wb 00 00” , and finish as end command “wb 00 ff”, and Adj. offset if need.

(2)Manual adjustment. method

1)Set TV in Adj. mode using P-Only key.

2)Zero Calibrate the probe of Color Analyzer, then place it on the center of LCD module within 10 cm of the surface.

3)Press ADJ key → EZ adjust using adj. R/C → 7. White- Balance then press the cursor to the right(key ►). (When right key(►) is pressed 216 Gray internal pattern will be displayed)

4)One of R Gain / G Gain / B Gain should be fixed at 192, and the rest will be lowered to meet the desired value.

5)Adjustment is performed in COOL, MEDIUM, WARM 3 modes of color temperature.

▪If internal pattern is not available, use RF input. In EZ Adj. menu 7.White Balance, you can select one of 2 Test-pattern: ON, OFF. Default is inner(ON). By selecting OFF, you can adjust using RF signal in 216 Gray pattern.

Copyright ©	LG Electronics. Inc. All rights reserved.	- 14 -	LGE Internal Use Only
Only for training and service purposes