LG 42LB7DF (CHASSIS:LJ81A) Service Manual ▷ View online
7. Adjustment Color Temperature
(White Balance)
7-1. Using Instrucments
(1) Color Analyzer: CA-210 (CH 9)
- Using LCD color temperature, Color Analyzer (CA-210)
must use CH 9, which Matrix compensated (White, Red,
Green, Blue compensation) with CS-2100. See the
Coordination bellowed one.
Green, Blue compensation) with CS-2100. See the
Coordination bellowed one.
(2) Auto-adjustment Equipment (It needs when Auto-
adjustment - It is availed communicate with RS-232C :
Baud rate: 115200)
Baud rate: 115200)
(3) Video Signal Generator MSPG-925F 720p, 216Gray
(Model: 217, Pattern 78)
7-2. Connection Diagram(Auto Adjusment)
(1) Using Inner Pattern
(2) Using HDMI input
7-2. White Balance Adjusment
(1) If you can’t adjust with inner pattern, then you can adjust it
using HDMI pattern. You can select option at “Ez-Adjust
Menu - 7. White Balance” there items “NONE, INNER,
HDMI”. It is normally setting at inner basically. If you can’t
adjust using inner pattern you can select HDMI item, and
you can adjust.
Menu - 7. White Balance” there items “NONE, INNER,
HDMI”. It is normally setting at inner basically. If you can’t
adjust using inner pattern you can select HDMI item, and
you can adjust.
(2) In manual Adjust case, if you press ADJ button of service
remocon, and enter “Ez-Adjust Menu - 7. White Balance”,
then automatically inner pattern operates. (In case of
“Inner” originally “Inner” will be selected.
1) Connect all cables and equipments like Pic.5)
2) Set Baud Rate of RS-232C to 115200. It may set
then automatically inner pattern operates. (In case of
“Inner” originally “Inner” will be selected.
1) Connect all cables and equipments like Pic.5)
2) Set Baud Rate of RS-232C to 115200. It may set
115200 orignally.
3) Connect RS-232C cable to set
4) Connect HDMI cable to set
5) Select LA75A Chassis at Adjustment equipment, and
4) Connect HDMI cable to set
5) Select LA75A Chassis at Adjustment equipment, and
adjust.
A
RS-232C Command(Commonly apply)
- Wb 00 00 Start Auto-adjustment of white balance
- Wb 00 10 Start Gain adjustment (Inner pattern)
- Jb 00 c0
- …
- Wb 00 1f End of Adjustment
* If it needs, offset adjustment(wb 00 20-Start, wb 00 2f-End)
- Wb 00 ff End of white balance adjustment
- Wb 00 10 Start Gain adjustment (Inner pattern)
- Jb 00 c0
- …
- Wb 00 1f End of Adjustment
* If it needs, offset adjustment(wb 00 20-Start, wb 00 2f-End)
- Wb 00 ff End of white balance adjustment
(Inner pattern disappear)
* Notice!
Adjustment Mapping information.
- When Color temperature (White balance) Adjustment.
(Automatically)
1) Press “Power only key” of service remocon and operatie
automatically adjustment.
2) Set BaudRate to 115200.
- You must start “wb 00 00” and finish it “wb 00 ff”.
- If it needs, then adjustment “Offset”.
- If it needs, then adjustment “Offset”.
- 17 -
Color Analyer
RS-232C
Full White Pattern
(Inner pattern)
(Inner pattern)
<Fig. 5> Connection diagram for Adjusment White balance
216Gray White Pattern
(HDMI Pattern)
(HDMI Pattern)
Color Analyer
MSPG-925FS
MSPG-925FS
Video Signal Generator
Video Signal Generator
ideo Signal Generator
Model : 217
Model : 217
Pattern : 78
Pattern : 78
Pattern : 78
RS-232C
RS-232C
Baud Rate : 1
Baud Rate : 1
Baud Rate : 115200
15200
Meaning
RS-232C Command
[CMD ID DATA]
wb
wb
wb
wb
wb
wb
00
00
00
00
00
00
00
10
1f
20
2f
ff
Start white balance adjustment
End Gain adjustment
End Offset adjustment
R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
jg
jh
ji
Cool
ja
jb
jc
Mid
RS-232C COMMAND
[CMD ID DATA]
CENTER
(DEFAULT)
jd
je
jf
00
00
00
192
192
192
127
127
127
Warm
Min
Max
184
187
192
64
64
64
Cool
192
183
161
64
64
64
Mid
192
159
95
64
64
64
Warm
7-3. White Balance Adjusment
(Manual adjustment)
(1) Test Equipment: CA-210
1) Using LCD color temperature, Color Analyzer (CA-210)
must use CH 9, which Matrix compensated (White, Red,
Green, Blue compensation) with CS-2100. See the
Coordination bellowed one.
Green, Blue compensation) with CS-2100. See the
Coordination bellowed one.
(2) Manual adjustment sequence is like bellowed one.
1) Turn to “Ez-Adjust” mode with press ADJ button of
service remocon.
2) Select “10.Test Pattern” with CH+/- button and press
enter. Then set will go on Heat-run mode. Over 30
minutes set let on Heat-run mode.
minutes set let on Heat-run mode.
3) Let CA-210 to zero calibration and must has gap more
10cm from center of LCD module when adjustment.
4) Press “ADJ” button of service remocon and select
“7.White-Balance” in “Ez-Adjust” then press “ G” button
of navigation key.
of navigation key.
(When press “ G” button then set will go to full white
mode)
5) Adjust at three mode (Cool, Medium, Warm)
6) If “Medium” and “Warm” mode.
6) If “Medium” and “Warm” mode.
- Let R-Gain to 192 and R, G, B-Cut to 64 and then
control G, B gain adjustment High Light adjustment.
7) With volume button (+/-) you can adjust.
8) After all adjustment finished, with Enter (
8) After all adjustment finished, with Enter (
A
key) turn to
Ez-Adjust mode. Then with ADJ button, exit from
adjustment mode.
adjustment mode.
(3) Using CS-1000 Equipment.
(4) Using CS-210 Equipment.(9CH)
- Contrast value : 216Gray
7-4. Test of RS-232C control
- Press In-Start button of Service Remocon then set the
“4.Baud Rate” to 115200. Then check RS-232C control.
7-5. Selection of Country option
model (Not allowed Korean model). It is selection of Country
about Rating and Time Zone.
about Rating and Time Zone.
(1) Models: All models which use LA75A Chassis (See the
first page.)
(2) Press “In-Start” button of Service Remocon, then enter the
“Option” Menu with “PIP CH-” Button.
(3) Select one of these three (USA, CANADA, MEXICO)
defends on its market using “Vol. +/-” button.
8. GND and ESD Testing
8-1. Prepare GND and ESD Testing
- Check the connection between set and power cord.
8-2. Operate GND and ESD auto-test
(1) Fully connectd(Between set and power cord) set enter the
Auto-test sequence.
(2) Connect D-Jack AV jack test equipment.
(3) Turn on Auto-controller(GWS103-4)
(4) Start Auto GND test.
(5) If its result is NG, then notice with buzzer.
(6) If its result is OK, then automatically it turns to ESD Test.
(7) Operate ESD test
(8) If its result is NG, then notice with buzzer.
(9) If its result is OK, then process next steps. Notice it with
(3) Turn on Auto-controller(GWS103-4)
(4) Start Auto GND test.
(5) If its result is NG, then notice with buzzer.
(6) If its result is OK, then automatically it turns to ESD Test.
(7) Operate ESD test
(8) If its result is NG, then notice with buzzer.
(9) If its result is OK, then process next steps. Notice it with
Good lamp and STOPER Down.
8-3. Check Items
(1) TEst Voltage
1) GND : 1.5KV/min at 100mA
2) Signal : 3KV/min at 100mA
2) Signal : 3KV/min at 100mA
(2) Test time : just 1 second.
(3) Test point
(3) Test point
1) GND test: Test between Power cord GND and Signal
cable metal GND.
2) ESD test: Test between Power cord GND and Live and
neutral.
(4) Leakage current: Set to 0.5mA(rms)
- 18 -
Color temperature Color analyzer
Color coordinate
X
Y
COOL
CA-210
0.276±0.002
0.283±0.002
MEDIUM
CA-210
0.285±0.002
0.293±0.002
WARM
CA-210
0.313±0.002
0.329±0.002
Color Temperature
COOL
MEDIUM
WARM
Remark
T=11000K, ∆uv=0.000, X=0.276, Y=0.283
T= 9300K, ∆uv=0.000, X=0.285, Y=0.293
T= 6500K, ∆uv=0.000, X=0.313, Y=0.329
9. Default Service option
9-1. ADC-Set
(1) R-Gain adjustment Value (default 128)
(2) G-Gain adjustment Value (default 128)
(3) B-Gain adjustment Value (default 128)
(4) R-Offset adjustment Value (default 64 )
(5) G-Offset adjustment Value (default 64 )
(6) B-Offset adjustment Value (default 64 )
(2) G-Gain adjustment Value (default 128)
(3) B-Gain adjustment Value (default 128)
(4) R-Offset adjustment Value (default 64 )
(5) G-Offset adjustment Value (default 64 )
(6) B-Offset adjustment Value (default 64 )
9-2. White balance. Value
9-3. Temperature Threshold
(1) Threshold Down Low
20
(2) Threshold Up Low
23
(3) Threshold Down High
70
(4) Threshold Down High
75
10. Default Service option
- 19 -
Input Mode
Volume Level
Mute
Aspect Ratio
Picture Picture Mode
User1
Back Light
Contrast
Bright
Sharpness
Color
Tint
Color Temperature
Picture Reset
Audio
Sound Mode
Auto Volume
Clear Voice
Front Surrround
Balance
TV Speaker
Time
Clock
Off Timer / On Timer
Sleep Timer / Auto Off
Option Language(Menu/Audio)
SimpLink
Key Lock
Caption
Set ID
Channel Memory
1
2
3
4
5
6
7
8
9
TV02CH
10
Off
16:9
Vivid
100
100
50
70
70
0
Medium
Standard
Off
Off
Off
0
On
Auto
Off
Portugues
On
Off
Off
1
RF : 2,3,4,5,6,7,8,9,10,11,
12,13,14,30,51,63
CATV : 15,16,17
Item
Condition
No
R Gain
G Gain
B Gain
R Cut
G Cut
B Cut
CENTER(DEFAULT)
Max
184
189
192
64
64
64
192
184
161
64
64
64
192
150
84
64
64
64
192
192
192
127
127
127
Cool
Mid
Warm
- 20 -
Flash
(32MB)
DDR1(128MB)
(16Mx16x4)
DDR1(128MB)
(16Mx16x4)
TEA6420
Audio
SW
MTV416
(M
icom
)
NTP3000
(Digital AMP)
64Bit I/F
RGB-PC
HDMI
1/2/3
COMP 1
COMP 2
AV1
AV2
RGB-PC
I2S
MCLK
Digital out
COMP1
COMP2
AV1
AV2
BCM7412
(MPEG4
Decoder)
Analog
/Digital
Tuner
TC90512
DVI
I2S
SIF
SPDIF Out
CVBS
CVBS/Y/C
Y/
Cb
/Cr
R/G/B
DDR1
(64MB)
CS5340
L/R
Serial TP
20bits
12bit YC 4:2:2
NIM TUNER
TMDS_RX+-
EPM240F
MNT out (Audio Only)
TMDS341A
(3x1,S/W)
CVBS/Y/C
MC33078
(AMP)
L/R
RS232
RX/TX
DVI
4:2:2 20bit YC
Full HD(1080P)
WXGA(768P)
RF
Switch
DM1/DP1
Serial
TP
74HC04
SPDIF Out
(Coaxial)
Video
Front
End
Dual
HDMI
Rx
HD/SD
Video
Encoder
Audio
DSP
USB2.0
PKT
HSX
PCI/
EBI
HD-DVI
IB0
Parse2
RSBUF
XCBUF
RMX0
BCM3553
Local KEY
24C16
74LVC14APW
X-tal(54M)
Reset
KIA7029
NVRAM
I2C
TROUBLESHOOTING
1. Power-Up Boot Fail
1-1. Block Diagram of Troubleshooting
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