LG 32LC4D (CHASSIS:LT73A) Service Manual ▷ View online
- 9 -
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet is applied to all of the LT73A chassis
manufactured at LG TV Plant all over the world.
manufactured at LG TV Plant all over the world.
2. Specification.
1) Because this is not a hot chassis, it is not necessary to use
an isolation transformer.
However, the use of isolation transformer will help to
protect test instruments
However, the use of isolation transformer will help to
protect test instruments
2) Adjustment must be done in the correct sequence.
3) The adjustment must be performed at 25±5°C temperature
3) The adjustment must be performed at 25±5°C temperature
and 65±10% relative humidity if there is no specified
designation.
designation.
4) The input voltage of the receiver must be kept between
100-220V~, 50/60Hz.
5) Before adjustment, execute Heat-Run for 30 minutes at RF
no signal.
3. EDID
* Caution
1) Use the proper signal cable for EDID Download
- Analog EDID : Pin3 exists
- Digital EDID : Pin3 exists
- Digital EDID : Pin3 exists
2) Never connect HDMI & D-sub Cable at the same time.
3) Use the proper cables below for EDID Writing.
4) Download HDMI1, HDMI2 separately because HDMI1 is
3) Use the proper cables below for EDID Writing.
4) Download HDMI1, HDMI2 separately because HDMI1 is
different from HDMI2.
3.1. EDID Data
3.2. Data
(1) ANALOG (128 bytes)
(2) HDMI 1 (256 bytes)
(3) HDMI 2 (256 bytes)
- Product ID
- Serial No: Controlled on production line.
- Month, Year: Controlled on production line:
- Serial No: Controlled on production line.
- Month, Year: Controlled on production line:
ex) Monthly : ‘01’ -> ‘01’
Year : ‘2007’ -> ‘11’
- Model Name(Hex):
- Checksum: Changeable by total EDID data.
- Checksum: Changeable by total EDID data.
D-sub to D-sub
DVI-D to HDMI or HDMI ro HDMI
For HDMI EDID
For Analog EDID
Item
Manufacurer ID
Version
Revision
Condition
GSM
Digital : 1
Digital : 3
Data(Hex)
1E6D
01
03
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F
0x00 00
FF
FF
FF
FF
FF
FF
00
1E
6D
Product ID
Serial No
0x01 Month/Year 01
03
01
46
27
78
EA
D9
B0
A3
57
49
9C
25
0x02 11
49
4B
A5
6E
00
31
40
45
40
61
40
D1
C0
01
01
0x03 01
01
01
01
01
01
1B
21
50
A0
51
00
1E
30
48
88
0x04 35
00
BC
86
21
00
00
1C
26
36
80
A0
70
38
1F
40
0x05 50
20
85
04
BC
86
21
00
00
18
00
00
00
FC
00
4C
0x06 47
20
54
56
0A
20
20
20
20
20
20
20
00
00
00
FD
0x07 00
3C
4B
1D
43
0E
00
0A
20
20
20
20
20
20
00
C/S
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F
0x00 00
FF
FF
FF
FF
FF
FF
00
1E
6D Product ID
Serial No
0x01
Month/Year
01
03
80
46
27
78
EA
D9
B0
A3
57
49
9C
25
0x02 11
49
4B
A5
6E
00
31
40
45
40
61
40
D1
C0
01
01
0x03 01
01
01
01
01
01
02
3A
80
18
71
38
2D
40
58
2C
0x04 45
00
C4
8E
21
00
00
1E
1B
21
50
A0
51
00
1E
30
0x05 48
88
35
00
BC
86
21
00
00
1C
00
00
00
FC
00
4C
0x06 47
20
54
56
0A
20
20
20
20
20
20
20
00
00
00
FD
0x07 00
32
4B
1C
43
0F
00
0A
20
20
20
20
20
20
01
C/S
0x00 02
03
21
F1
4E
02
11
01
03
12
13
04
14
05
21
1F
0x01 20
22
10
23
09
07
07
83
01
00
00
65
03
0C
00
10
0x02 00
01
1D
00
BC
52
D0
1E
20
B8
28
55
40
C4
8E
21
0x03 00
00
1E
01
1D
00
72
51
D0
1E
20
6E
28
55
00
C4
0x04 8E
21
00
00
1E
01
1D
80
D0
72
1C
16
20
10
2C
25
0x05 80
C4
8E
21
00
00
9E
8C
0A
D0
90
20
40
31
20
0C
0x06 40
55
00
C4
8E
21
00
00
18
4E
1F
00
80
51
00
1E
0x07 30
40
80
37
00
BC
88
21
00
00
18
00
00
00
00
C/A
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D0x0E 0x0F
0x00 00
FF
FF
FF
FF
FF
FF
00
1E
6D Product ID Serial No
0x01 Month/Year 01
03
80
46
27
78
EA
D9
B0
A3
57
49
9C
25
0x02 11
49
4B
A5
6E
00
31
40
45
40
61
40
D1
C0
01
01
0x03 01
01
01
01
01
01
02
3A
80
18
71
38
2D
40
58
2C
0x04 45
00
C4
8E
21
00
00
1E
1B
21
50
A0
51
00
1E
30
0x05 48
88
35
00
BC
86
21
00
00
1C
00
00
00
FC
00
4C
0x06 47
20
54
56
0A
20
20
20
20
20
20
20
00
00
00
FD
0x07 00
32
4B
1C
43
0F
00
0A
20
20
20
20
20
20
01
C/S
0x00 02
03
21
F1
4E
02
11
01
03
12
13
04
14
05
21
1F
0x01 20
22
10
23
09
07
07
83
01
00
00
65
03
0C
00
20
0x02 00
01
1D
00
BC
52
D0
1E
20
B8
28
55
40
C4
8E
21
0x03 00
00
1E
01
1D
00
72
51
D0
1E
20
6E
28
55
00
C4
0x04 8E
21
00
00
1E
01
1D
80
D0
72
1C
16
20
10
2C
25
0x05 80
C4
8E
21
00
00
9E
8C
0A
D0
90
20
40
31
20
0C
0x06 40
55
00
C4
8E
21
00
00
18
4E
1F
00
80
51
00
1E
0x07 30
40
80
37
00
BC
88
21
00
00
18
00
00
00
00
C/A
* Before AV ADC Calibration, should be executed the “Tool option”
4. Select LCD module size and tool
1) Press ADJ Key in the Adjust remote control.
2) Select “Tool option 1” by using
2) Select “Tool option 1” by using
D
/
E
(CH+/-) key, and press
A
(ENTER).
3) Change “Inch” and “Tool” according to the inch of model
4) After changing the panel size, push he EXIT key.
tool option 1 - 76
tool option 2 - 1665
tool option 2 - 1665
5. ADC Calibration
* Caution
- System control RS-232 host should be “PC” for adjustment.
- Before AV ADC calibration, execute the “Panel size selection”.
- Before AV ADC calibration, execute the “Panel size selection”.
5.1. Adjustment of RF/AV/S-VIDEO
(1) Required Equipments
1) Remote controller for adjustment
2) MSPG-925FS pattern generator (Which has Video
2) MSPG-925FS pattern generator (Which has Video
Signal : 7 Color Bar Pattern shown in Fig. 1)
=> Model: 207 / Pattern: 65
=> Model: 207 / Pattern: 65
(2) Method of Auto RF/AV/S-VIDEO Color Balance.(NTSC-J)
1) Input the Video Signal: 7 Color Bar signal into AV4
2) Set the PSM to Dynamic mode in the Picture menu
2) Set the PSM to Dynamic mode in the Picture menu
3) Press IN-START key on R/C for adjustment.
4) Press the
4) Press the
G
(Vol.+) key to operate the set, then it
becomes automatically.
5) Auto-RGB OK means the adjustment is completed.
5.2. Adjustment of Component
(1) Required Equipments
1) Remote controller for adjustment
2) MSPG-925FS pattern generator (Which has 720p/60Hz
2) MSPG-925FS pattern generator (Which has 720p/60Hz
YPbPr output Pattern shown in Fig. 1)
=> Model: 216 / Pattern: 65
=> Model: 216 / Pattern: 65
(2) Method of Auto Component Color Balance
1) Input the Component 720p/60Hz 7 Color Bar(MSPG-
925FS model:216, pattern:65) signal into Component.
2) Set the PSM to Dynamic mode in the Picture menu
3) Press the IN-START key on R/C for adjustment.
4) Press the
3) Press the IN-START key on R/C for adjustment.
4) Press the
G
(Vol.+) key to operate the set, then it
becomes automatically.
5) Auto-RGB OK means the adjustment is completed.
5.3. Adjustment of RGB
(1) Required Equipments
1) Remote controller for adjustment
2) MSPG-925FS Pattern Generator (Which has XGA
2) MSPG-925FS Pattern Generator (Which has XGA
[1024*768] 60Hz 8 Color Bar 100% pattern shown in
Fig. 1)
Fig. 1)
(2) Method of Auto RGB Color Balance
1) Input the PC 1024x768@60Hz 7 Color Bar (MSPG-
925FS model: 37, pattern: 33) signal into RGB. (Using
D-sub to D-sub cable)
D-sub to D-sub cable)
2) Set the PSM to Dynamic mode in Picture menu.
3) Press the IN-START key on R/C for adjustment.
4) Press the
3) Press the IN-START key on R/C for adjustment.
4) Press the
G
(Vol.+) key operate To set , then it becomes
automatically.
5) Auto-RGB OK means adjustment is completed.
- 10 -
ADC
RF/AV/S-VIDEO
Component
RGB-PC
MSPG925FS NTSC-J
Model:217 (720P)
Model: 3
INPUT SELECT AV1
Pattern:33
(1024*768 60Hz)
Model: 207 (NTSC-J)
720P/60Hz 100%
Pattern : 65
Pattern : 65
7 Color Bar
7 Color Bar
[Fig.1]
* Before adjusting White-balance, the AV ADC should be done.
6. White Balance
6.1. Test Equipment
(1) Color Analyzer (CA-110)
When you adjust LCD color temperature, on Color analyzer
(CA-210), you should use Channel 9 which is Matrix
compensated (White, Red, Green, Blue revised) by CS-
1000 and adjust in accordance with White balance
adjustment coordinate which is specified on the next.
(CA-210), you should use Channel 9 which is Matrix
compensated (White, Red, Green, Blue revised) by CS-
1000 and adjust in accordance with White balance
adjustment coordinate which is specified on the next.
1) Color temperature standards according to CSM and Module.
2) White balance ajdustment coordinate and color temperature
3) PC (for communication through RS-232C) -> UART Baud
rate : 115200 bps
4) Luminance Y AV : upper 200 cd/m
2
) -> Applying to Cool
(2) Connecting picture of the measuring instrument(Automatic)
- Inside Pattern is used when W/B is controlled. Connect to
auto controller or push control R/C IN START -> Enter the
mode of White-Balance, the pattern will come out.
mode of White-Balance, the pattern will come out.
(3) Auto-control interface and directions
1) Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10 lux).
2) Adhere closely the color analyzer(CA-210) to the module
less than 10cm distance, keep it with the surface of the
module and color analyzer’s prove vertically.(80-100°).
module and color analyzer’s prove vertically.(80-100°).
3) Aging time
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 15 minutes.
- In case of LCD, using ‘no signal’ or ‘full white pattern’
or the others, check the back light on.
6.2. Manual white Balance
One of R Gain / G Gain / B Gain should be kept on 80, and
others are controlled lowering from 80
1) Press ‘power on’ of the control R/C, set heat run to white by
others are controlled lowering from 80
1) Press ‘power on’ of the control R/C, set heat run to white by
pressing
G
, and heat run over 15 minutes.
(Set: RS-233 Host: PC, Baud Rate: 115200bps, Download:
Cortez)
Cortez)
2) Zero Calibrate CA-210, and when controlling, stick the
sensor to the center of LCD module surface.
3) Double click In-start key on Controlling R/C and get in ‘white
balance’.
4) Set test-pattern on and display inside pattern. Control is
carried out on three color temperature, COOL, MEDIUM,
WARM. (Control is carried out three times,)
WARM. (Control is carried out three times,)
5) When the R/G/B GAIN is 80 on OSD, it is the FULL
DYNAMIC Range of the Module. In order to control white
balance without the saturation of FULL DYNAMIC Range
and DATA, one of R Gain / G Gain / B Gain should be kept
on 80, and other two is controlled lowering from 80.
balance without the saturation of FULL DYNAMIC Range
and DATA, one of R Gain / G Gain / B Gain should be kept
on 80, and other two is controlled lowering from 80.
* Color Temperature: Cool, Medium, Warm
- When R GAIN is set to 80
-> Control G GAIN and B GAIN by lowering from 80.
- When B GAIN is set to 80
-> Control R GAIN and G GAIN by lowering from 80.
- When G GAIN is set to 80
-> Control R GAIN and B GAIN by lowering from 80.
One of R Gain / G Gain / B Gain should be kept on 80, and
adjust other two lower than 80.
(When R/G/B GAIN are all 80, it is the FULL DYNAMIC
Range of Module)
adjust other two lower than 80.
(When R/G/B GAIN are all 80, it is the FULL DYNAMIC
Range of Module)
- 11 -
CSM
Color Temp.
Cool
11,000K
Medium
9,300K
Warm
6,500K
CS-1000
CA-210(CH 9)
Cool
x
0.276
0.276±0.002
y
0.283
0.283±0.002
Δμv
0.000
0.000
CS-1000
CA-210(CH 9)
Medium
x
0.285
0.285±0.002
y
0.293
0.293±0.002
Δμv
0.000
0.000
CS-1000
CA-210(CH 9)
Warm
x
0.313
0.313±0.002
y
0.329
0.329±0.002
Δμv
0.003
0.003
Type
LT73A
Baud Rate
Data bit
Stop bit
Parity
115200
8
1
None
Protocol
Index
Cmd 1
Cmd 2
Min Value
Max Value
Setting
R-Gain_Normal
j
a
00(00)
128(80)
G-Gain_Normal
j
b
00(00)
128(80)
B-Gain_Normal
j
c
00(00)
128(80)
R-Gain_Warm
d
00(00)
128(80)
G-Gain_Warm
j
e
00(00)
128(80)
B-Gain_Warm
j
f
00(00)
128(80)
R-Gain_Cool
g
00(00)
128(80)
G-Gain_Cool
j
h
00(00)
128(80)
B-Gain_Cool
j
i
00(00)
128(80)
R-Offset_Normal
l
j
00(00)
128(80)
G-Offset_Normal
l
k
00(00)
128(80)
B-Offset_Normal
l
l
00(00)
128(80)
R-Offset_Warm
l
m
00(00)
128(80)
G-Offset_Warm
l
n
00(00)
128(80)
B-Offset_Warm
l
o
00(00)
128(80)
R-Offset_Cool
l
p
00(00)
128(80)
G-Offset_Cool
l
q
00(00)
128(80)
[Fig.2] Connection picture(On Automatic Control)
- 12 -
TROUBLESHOOTING
1. No power
(1) Symptom
1) Minute discharge does not occur at module.
2) Front LED does not activate.
2) Front LED does not activate.
(2) Check following
Plug in the power cord.
No
Yes
Is the power
cord plugged in?
Connect the cable.
No
Yes
Are the Line Filter
and Power Board cable
connected?
Replace the fuse.
No
Yes
Is the fuse(F100) of
Power Board normal?
Connect the cable.
After the cable connect is removed to Power Board(except the CN101
connection cable), the AC voltage marking is authorized on manual.
If ST-BY 5V is not operated, replace Power Board.
connection cable), the AC voltage marking is authorized on manual.
If ST-BY 5V is not operated, replace Power Board.
No
Yes
Is it
Power Board and
13-14pin cable connected
to the VSC board
cable?
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