DOWNLOAD LG 47LH85 (CHASSIS:LA92F) Service Manual ↓ Size: 39.68 MB | Pages: 76 in PDF or view online for FREE

Model
47LH85 (CHASSIS:LA92F)
Pages
76
Size
39.68 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
47lh85-chassis-la92f.pdf
Date

LG 47LH85 (CHASSIS:LA92F) Service Manual ▷ View online

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 -
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
5-3. Adjustment of White Balance
5.3.1 Automatic Adjustment
1) The adjustment condition should be set by the Power On
key.
2) Perform the zero calibration of the Color Analyzer and
place the probe close to the display center.
3) Connect the communication cable (RS-232C).
4) Select the desired model of the adjustment program and
perform the adjustment.
5) After the adjustment is ended (check the OK sign), check
the adjustment condition for each mode of the set.
(Warm, Medium, Cool)
6) Disconnect the probe and the communication cable to end
the adjustment.
* The adjustment should be started with "wb 00 00" and
ended with "wb 00 ff", and the offset should be adjusted
when necessary.
5.3.2 Manual adj. method
1) Set TV in Adj. mode using POWER ON
2) Press the ADJ of the R/C to enter into ‘EZ-ADJUST’.
3) Select ‘10.TEST PATTERN’ with the CH +/- key and press
the Enter key for 30 minutes or longer to perform the heat
run.
4) Perform the zero calibration of the Color Analyzer and fix
the sensor with the 10cm or less distance at the center of
the LCD module surface when adjusting.
5) Press the ADJ of the R/C to select ‘7.White-Balance’ of the
Ez-Adjust and press the right arrow key(
G
) to enter into the
adjustment mode. (As soon as you press ‘
G
’, the screen is
entered into the full white inner pattern.)
6) Fix one of the R/G/B gains to 192 and decrease the
remaining two gains to adjust not to exceed 192.
7) The adjustment is done at three white balances of Cool,
Medium and Warm
* Adjustment environment and reference
1) Environment illuminance
Adjust it to 10 LUX or less at the place where the light
source such as lamp should be blocked at maximum.
2) Probe location
: Maintain the Color Analyzer (CA-210) close to the
module surface by 10cm or less and keep the probe of
the Color Analyzer perpendicular to the module
surface (80°~ 100°).
3) Aging time
- Keep the power on after the aging start (with no power
off) to perform the heat run for 15 minutes or longer.
- Make sure that the back light is turned on by using no
signal and the full white pattern or others.
• Standard color coordinate and temperature using CS-
1000 (over 26 inch)
• Standard color coordinate and temperature using CA-
210(CH 9)
5.4 Option selection per country
(1) Overview
- Option selection is only done for models in Non-USA
- Applied model: LA92A Chassis applied None USA
model(CANADA, MEXICO)
(2) Method
1) Press ADJ key on the Adj. R/C, then select Country
Group Menu
2) Depending on destination, select KR or US, then on the
lower Country option, select US, CA, MX. Selection is
done using +, - KEY
• TV
- Adjust directly if it's not a Wireless/Wired state 
- Adjust after changing to HDMI5 on the Wireless/Wired state
• Media-Box  
- Adjust on the Wireless/Wired state that is excepted the
HDMI5. 
- 14 -
Mode
Color Coordination
Temp
UV
x
y
COOL
0.276
0.283
11000K
0.0000
MEDIUM
0.285
0.293
9300K
0.0000
WARM
0.313
0.329
6500K
0.0000
Mode
Color Coordination
Temp
UV
x
y
COOL
0.276±0.002
0.283±0.002
11000K
0.0000
MEDIUM
0.285±0.002
0.293±0.002
9300K
0.0000
WARM
0.313+0.002
0.329±0.002
6500K
0.0000
- 15 -
6. EYE-Q function check
Step 1) Turn on TV
Step 2) Press EYE key of Adj. R/C
Step 3) Cover the Eye Q II sensor on the front of the using
your hand and wait for 6 seconds
Step 4) Confirm that R/G/B value is lower than 10 of the
“Raw Data (R: G: B: )” .
If after 6 seconds, R/G/B value is not lower than 10,
replace Eye Q II sensor
Step 5) Remove your hand from the Eye Q II sensor and wait
for 6 seconds
Step 6) Confirm that “B. Light(xxx)” value increases from 0.
If change is not seen, replace Eye Q II sensor
< step 2>                         < step 3>                         < step 4>
< step 5>                        < step 6>
7.1 Method
- Check that Power Cord is fully inserted to the set
(If loose, re-insert)
- Unit w/ fully inserted power cord and A/V arrives to the auto-
check process.
- Connect D-terminal AV JACK TESTER
- Auto CONTROLLER(GWS103-4) ON
- Perform GND TEST
- If NG, Buzzer will sound to inform the operator
- If OK, changeover to I/P check automatically
(Remove CORD,A/V from AV Jack Box)
- Perform I/P test
- If NG, Buzzer will sound to inform the operator
- If OK, Good lamp will lit up and the stopper will allow the
pallet to move on to next process.
7.2 Checkpoint
NEUTRAL
• LEAKAGE CURRENT: At 0.5mArms
Green Eye-Check 
Sensor Data:
      1 
Backlight:     0
 
O.K 
Green Eye-Check 
Sensor Data:   215 
Backli ght :     100 
- 16 -
EXPLODED VIEW
300
200
200T
810
803
804
400
520
540
805
900
550
802
530
801
121
120
510
570
500
560
310
700
710
770
780
790
720
730
750
740
760
A2
LV1
A10
LV2
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by       in the Schematic Diagram and EXPLODED VIEW. 
It  is  essential  that  these  special  safety  parts  should  be  replaced  with  the  same  components  as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards. 
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
Media Box
521
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