LG 32LT75 / 32LT76 (CHASSIS:LD74A) Service Manual ▷ View online
- 9 -
7. HDMI input (PC Mode)
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remark
1.
720*400
31.468
70.08
28.321
2.
640*480
31.469
59.94
25.17
VESA
DTV mode --> 480p Display
37.684
75.00
31.50
848*480 60Hz, 852*480 60Hz Ë No signal
3
800*600
37.879
60.31
40.00
VESA
46.875
75.00
49.50
4.
832*624
49.725
74.55
57.283
Macintosh
5.
1024*768
48.363
60.00
65.00
VESA(XGA)
56.470
70.00
75.00
60.123
75.029
78.75
6
1280*768
47.78
59.87
79.5
WXGA
PC mode only
7
1360*768
47.72
59.8
84.75
WXGA
8
1366*768
47.56
59.6
84.75
WXGA
9
1280*1024
63.595
60.0
108.875
SXGA
FHD Model only
10
1400*1050
65.160
60.0
122.50
SXGA
FHD Model only
11
1600*1200
74.077
60.0
130.375
UXGA
Reduced Blanking Timing, FHD Model only
Input 1920*1200 60Hz --> No Signal
12
1920*1080
66.647
59.988
138.625
WUXGA
Reduced Blanking Timing
DTV mode --> 1080P Display
- 10 -
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet is applied to all of the LD74A 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. Channel Memory
1) Press ADJ key in Adjust remote control.
2) Select “Channel Recover” by using
2) Select “Channel Recover” by using
D
/
E
(CH+/-) key, and
press
G
(VOL+).
3) The set is turned off automatically.
4) Press ‘power’ key of Adjust Remote control.
4) Press ‘power’ key of Adjust Remote control.
4. 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.
4.1. EDID Data
4.2. Data
(1) ANALOG (128 bytes)
(2) HDMI 1 (256 bytes)=>
=> Detail EDID Options are below (a, b, c, d, e-1, e-2, f-1, f-2)
(3) HDMI 2 (256 bytes)
=> Detail EDID Options are below (a, b, c, d, e-1, e-2, f-1, f-2)
ⓐ 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 : ‘09’ -> ‘09’
Year : ‘2006’ -> ‘10’
ⓓ Model Name(Hex):
ⓔ-1, ⓔ-2, ⓕ-1, ⓕ-2 Checksum: Changeable by total
EDID data.
ⓔ-1, ⓔ-2, ⓕ-1, ⓕ-2 Checksum: Changeable by total
EDID data.
Item
Manufacurer ID
Version
Revision
Condition
GSM
Digital : 1
Digital : 3
Data(Hex)
1E6D
01
03
D-sub to D-sub
DVI-D to HDMI or HDMI ro HDMI
For HDMI EDID
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
ⓐ
ⓑ
0x01
ⓒ
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
ⓓ
0x06
ⓓ
00
00
00
FD
0x07 00
3C
4B
1D
43
0E
00
0A
20
20
20
20
20
20
00
ⓔ-1
For Analog EDID
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
ⓐ
ⓑ
0x01
ⓒ
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
ⓓ
0x06
ⓓ
00
00
00
FD
0x07 00
32
4B
1C
43
0F
00
0A
20
20
20
20
20
20
01
ⓔ-2
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
3
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
ⓕ-1
0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F
0x00
0
FF
FF
FF
FF
FF
FF
0
1E
6D
ⓐ
ⓑ
0x01
ⓒ
1
3
80
46
27
78
EA
D9
B0
A3
57
49
9C
25
0x02 11
49
4B
A5
6E
0
31
40
45
40
61
40
D1
C0
1
1
0x03
1
1
1
1
1
1
2
3A
80
18
71
38
2D
40
58
2C
0x04 45
0
C4
8E
21
0
0
1E
1B
21
50
A0
51
0
1E
30
0x05 48
88
35
0
BC
86
21
0
0
1C
ⓓ
0x06
ⓓ
0
0
0
FD
0x07
0
32
4B
1C
43
0F
0
0A
20
20
20
20
20
20
1
ⓔ-2
0x00
2
3
21
F1
4E
2
11
1
3
12
13
4
14
5
21
1F
0x01 20
22
10
23
9
7
7
83
1
0
0
65
3
0C
0
10
0x02
0
1
1D
0
BC
52
D0
1E
20
B8
28
55
40
C4
8E
21
0x03
0
0
1E
1
1D
0
72
51
D0
1E
20
6E
28
55
0
C4
0x04 8E
21
0
0
1E
1
1D
80
D0
72
1C
16
20
10
2C
25
0x05 80
C4
8E
21
0
0
9E
8C
0A
D0
90
20
40
31
20
0C
0x06 40
55
0
C4
8E
21
0
0
18
4E
1F
0
80
51
0
1E
0x07 30
40
80
37
0
BC
88
21
0
0
18
0
0
0
0
ⓕ-2
- 11 -
* Before AV ADC Calibration, should be executed the “Tool option 1”
5. Select method of Tool option 1
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)Select “Maker” by using
D
/
E
(CH+/-) key, and change the
module maker and. applied module classification by using
F
/
G
(VOL+/-).
4) Select “Inch” by using
D
/
E
(CH+/-) key, and change the
module according to the inch of model.
5) Select “Tool” by using
D
/
E
(CH+/-) key, and change the
tool name according to the model.
(Inch of model : 26”, 32”, 37”, 42”, Applied module under the
classification)
classification)
6) After changing the Tool option 1, push the EXIT Key.
6. ADC Calibration
<Caution>
- System control RS-232 Host should be “PC” for adjustment.
- Before AV ADC Calibration, execute the “Module selection”.
- System control RS-232 Host should be “PC” for adjustment.
- Before AV ADC Calibration, execute the “Module selection”.
6.1. Adjustment of RF/AV/S-VIDEO
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925FS Pattern Generator (Which has Video
- MSPG-925FS Pattern Generator (Which has Video
Signal: 7 Color Bar Pattern shown in Fig. 1)
=> Model: 202 / Pattern: 65
=> Model: 202 / Pattern: 65
(2) Method of Auto RF/AV/S-VIDEO Color Balance.
1) Input the Video Signal: 7 Color Bar signal into AV3.
2) Set the PSM to Dynamic mode in the Picture menu.
3) Press IN-START key on R/C for adjustment.
4) Press the
2) Set the PSM to Dynamic mode in the Picture menu.
3) Press 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.
6.2. Adjustment of Component.
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925FS Pattern Generator (Which has 720p/50Hz
- MSPG-925FS Pattern Generator (Which has 720p/50Hz
YPbPr output Pattern shown in Fig. 1 )
=> Model:215/Pattern: 65
=> Model:215/Pattern: 65
(2) Method of Auto Component Color Balance
1) Input the Component 720p/50Hz 7 Color Bar(MSPG-
925FS model: 215, 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.
ADC
RF/AV/S-VIDEO
Component
RGB-PC
MSPG925FS PALJ
Model:215 (720P)
Model: 60
INPUT SELECT AV3
Pattern:65
(1024*768 60Hz)
Model: 202 (PAL-BGDHI) 720P/50Hz
Pattern: 65
Pattern: 65
7 Color Bar
PAL 7 Color Bar
Tool option1
Maker
Inch
Tool
2060
LPL
32
LT75
<Fig. 1>
- 12 -
6.3. Adjustment of RGB
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925FS Pattern Generator
- MSPG-925FS Pattern Generator
(Which has XGA [1024*768] 60Hz 8 Color bar 100%
pattern shown in Fig. 1)
pattern shown in Fig. 1)
(2) Method of Auto RGB Color Balance
1) Input the PC 1024x768@60Hz 100% Color Bar (MSPG-
925FS model:60, pattern:65) signal into RGB.
(Using D-sub to D-sub cable)
(Using 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.
* Before White-balance, the AV ADC should be done.
7. White Balance
* Test Equipment
Color Analyzer (CA-210/CH.9)
-> 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.
-> 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.
* Color temperature standards according to CSM and Module
Cool : 11,000k
Medium : 9,300k
Warm : 6,500k
Medium : 9,300k
Warm : 6,500k
* White balance adjustment coordinate and color temperature
- PC (for communication through RS-232C)
-> UART Baud rate : 115200 bps
- Luminance Y AV : upper 150 cd/m
2
(Typ : 350 cd/m
2
)
-> Applying to Cool, Medium, Warm mode
* Connecting picture of the measuring instrument (On
Automatic control)
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.
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.
* Auto adjustment Map (RS-232C)
* Auto-control interface and directions
1) Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10ux).
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°).
of the 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.
- Using ‘no signal’ or ‘full white pattern’ or the others,
check the back light on.
Cool
CS-1000
CA-210(CH 9)
x
0.276
0.276±0.002
y
0.283
0.283±0.002
∆uv
0.000
0.000
Medium
CS-1000
CA-210(CH 9)
x
0.285
0.285±0.002
y
0.293
0.293±0.002
∆uv
0.000
0.000
Warm
CS-1000
CA-210(CH 9)
x
0.313
0.313±0.002
y
0.329
0.329±0.002
∆uv
0.004
0.004
<Fig. 2> Connecting picture (On Automatic Control)
Type
LD74A
Baud Rate
Data bit
Stop bit
Parity
115200
8
1
None
Protocol
Index
Cmd 1 Cmd 2
Data 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
j
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
j
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)
B-Offset_Cool
l
r
00(00)
128(80)
w
b
00
W/B adjustment Start
w
b
10
w
b
ff
W/B adjustment end
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