LG 42LY99-ZC (CHASSIS:LD75C) Service Manual ▷ View online
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3. Chroma & Brightness (LCD Module)
4. Component Video Input (Y, P
B
, P
R
)
No
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel clock(MHz)
Proposed
1
720*480
15.73
59.94
13.500
SDTV, DVD 480I(525I)
2
720*480
15.75
60.00
13.514
SDTV, DVD 480I(525I)
3
720*576
15.625
50.00
13.500
SDTV, DVD 576I(625I)
4 720*480
31.47
59.94
27.000
SDTV
480P
5 720*480
31.50
60.00
27.027
SDTV
480P
6 720*576
31.25
50.00
27.000
SDTV
576P
7 1280*720
44.96
59.94
74.176
HDTV
720P
8 1280*720
45.00
60.00
74.250
HDTV
720P
9 1280*720
37.50
50.00
74.25
HDTV
720P
10 1920*1080
33.72
59.94
74.176
HDTV
1080I
11 1920*1080
33.75
60.00
74.250
HDTV
1080I
12
1920*1080
28.125
50.00
74.250
HDTV 1080I
13
1920*1080
67.50
60.00
148.50
HDTV 1080P
No
Item
Min.
Typ.
Max
Unit
Remark
1
Viewing Angle<CR>10>
R/L
178
U/D
178
2.
White average brightness
400
500
-
cd/m
- 100IRE Full White Pattern (255 gray)
- Picture : Dynamic (Cool)
3.
Brightness uniformity
1.3
cd/m
- 100IRE Full White Pattern (255 gray)
- Picture : Dynamic (Cool)
4.
Color Coordinate
White
X
Typ
0.279
Typ
- 85IRE Full White Pattern (216 gray)
Y
-0.03
0.292
+0.03
- Picture : Dynamic (Cool)
Red
X
0.663
Y
0.324
Green
X
0.194
Y
0.659
Blue
X
0.141
Y
0.082
5.
Color coordinate uniformity
-0.03
Average
+0.03
- 85IRE Full White Pattern (216 gray)
- Picture : Dynamic (Cool)
6.
Contrast Ratio
CR with
7000 : 1
10000 :1
- Full white(100IRE)
at dark room
PWM-Dimming
- Full black(0IRE) pattern
CR without
7000 : 1
10000 :1
- Picture : Dynamic (Cool)
PWM-Dimming
- Input : TV/DTV/AV1,2,3/Comp/HDMI1,2
-> CR with PWM-Dimming
RGB/HDMI-PC
-> CR without PWM-Dimming
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5. RGB PC INPUT (PC)
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remarks
1.
720*400
31.468
70.08
28.32
2.
640*480
31.469
59.94
25.17
VESA
848*480 60Hz, 852*480 60Hz
37.500
75.00
31.50
-> Display 640*480 60H
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)
56.476
70.00
75.00
60.023
75.03
78.75
6
1280*768
47.693
59.99
80.125
WXGA
7
1360*768
47.649
59.94
84.625
WXGA
8
1366*768
47.649
59.94
84.625
WXGA
9
1280*1024
63.595
60.0
108.875
SXGA
10
1400*1050
65.160
60.0
122.50
SXGA
11
1920*1080
66.647
59.988
138.625
WUXGA
Reduced Blanking Timing
6. HDMI input (DTV)
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remarks
1.
720*480
31.47
59.94
27.00
SDTV 480P(4:3)
PC mode -> Display 640*480
2.
720*480
31.50
60
27.027
SDTV 480P(4:3)
3.
640*480
31.469
59.94
25.175
SDTV 480P(4:3)
4.
640*480
31.469
60.00
25.20
SDTV 480P(4:3)
5.
720*480
31.47
59.94
27.000
SDTV 480P(16:9)
6.
720*480
31.50
60.00
27.027
SDTV 480P(16:9)
7.
720*576
31.25
50.00
27.000
SDTV 576P
8.
1280*720
37.50
50.00
74.176
HDTV 720P
9.
1280*720
44.96
59.94
74.176
HDTV 720P
PC mode ->
10.
1280*720
45.00
60.00
74.250
HDTV 720P
Display 1280*768 60Hz
11
1920*1080
33.72
59.94
74.176
HDTV 1080I
12
1920*1080
33.75
60.00
74.250
HDTV 1080I
13
1920*1080
28.125
50.00
74.250
HDTV 1080I 50Hz
14
1920*1080
27.000
24.00
74.250
HDTV 1080P 24Hz
15
1920*1080
56.250
50
148.500
HDTV 1080P 50Hz
16
1920*1080
67.433
59.94
148.352
HDTV 1080P
PC mode ->
17
1920*1080
67.500
60
148.500
HDTV 1080P
Display 1920*1080 60Hz
- 9 -
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remarks
1.
720*400
31.468
70.08
28.32
2.
640*480
31.469
59.94
25.17
VESA
DTV mode -> Display 480p
37.500
75.00
31.50
848*480 60Hz, 852*480 60Hz
:Display 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
Mcintosh
5
1024*768
48.363
60.00
65.00
VESA(XGA)
56.476
70.00
75.00
60.023
75.03
78.75
6
1280*768
47.693
59.99
80.125
WXGA
7
1360*768
47.649
59.94
84.625
WXGA
8
1366*768
47.649
59.94
84.625
WXGA
9
1280*1024
63.595
60.0
108.875
SXGA
10
1400*1050
65.160
60.0
122.50
SXGA
11
1600*1200
74.077
60.0
130.375
UXGA
Reduced Blanking Timing
Input 1920*1200 60Hz ->No Signal
12
1920*1080
66.647
59.988
138.625
WUXGA
Reduced Blanking Timing
DTV mode -> 1080P Display
7. HDMI input (PC)
- 10 -
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet is applied to all of the LD75C 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 “System Control 3” by using
2) Select “System Control 3” by using
D
/
E
(CH+/-) key, and
press
A
(ENTER).
3) Select “Channel Recover” by using
D
/
E
(CH+/-) key, and
press
G
(VOL+).
4) When Channel Recover is completed, set will be turned off
and LED light og to stand-by model.
Tool option 1 and 2 are fixed. So, you need not chaange
these munbers.
these munbers.
4. ADC Calibration
- This process should be done at insert process. If ADC Cal. is
not done at whole assembly line , you should do this
process again.
process again.
<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”.
4.1. 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.
4.2. Adjustment of Component.
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925FS Pattern Generator (Which has 720p/60Hz
- MSPG-925FS Pattern Generator (Which has 720p/60Hz
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.
Model Name Tool option 1 Tool option 2 Maker Inch
Tool
42LY99
228087
1733
WCG
42
LY99
ADC
RF/AV/S-VIDEO
Component
RGB-PC
MSPG925FS PALJ
Model:215 (720P) Model: 3
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
<Fig. 1>
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