DOWNLOAD LG 42LM3700 (CHASSIS:LA21B) Service Manual ↓ Size: 5.94 MB | Pages: 43 in PDF or view online for FREE

Model
42LM3700 (CHASSIS:LA21B)
Pages
43
Size
5.94 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lm3700-chassis-la21b.pdf
Date

LG 42LM3700 (CHASSIS:LA21B) Service Manual ▷ View online

- 6 -
7. HDMI Input
No.
Resolution
H-freq(kHz)
V-freq.(kHz)
Pixel clock(MHz)
         Proposed
Remarks
PC (DVI)
DDC
1
640*350
31.468
70.09
25.17
EGA
X
2
720*400
31.469
70.08
28.32
DOS
O
3
640*480
31.469
59.94
25.17
VESA(VGA)
O
4
800*600
37.879
60.31
40.00
VESA(SVGA)
O
5
1024*768
48.363
60.00
65.00
VESA(XGA)
O
6
1152*864
54.348
60.053
VESA
O
7
1280*1024
63.981
60.020
108.0
VESA (SXGA)
O
Full HD model Only
8
1360*768
47.712
60.015
85.50
VESA (WXGA)
O
9
1920*1080
67.50
60.00
148.5
HDTV 1080P
O
Full HD model Only
DTV
1
720*480
31.47
60.00
27.027
SDTV 480P
2
720*480
31.47
59.94
27.00
SDTV 480P
3
1280*720
45.00
60.00
74.25
HDTV 720P
4
1280*720
44.96
59.94
74.176
HDTV 720P
5
1920*1080
33.75
60.00
74.25
HDTV 1080I
6
1920*1080
33.72
59.94
74.176
HDTV 1080I
7
1920*1080
67.50
60.00
148.50
HDTV 1080P
8
1920*1080
67.432
59.94
148.352
HDTV 1080P
9
1920*1080
27.00
24.00
74.25
HDTV 1080P
10
1920*1080
26.97
23.976
74.176
HDTV 1080P
11
1920*1080
33.75
30.00
74.25
HDTV 1080P
12
1920*1080
33.71
29.97
74.176
HDTV 1080P
- 7 -
8. 3D Mode (LM5800//LM4600/ CM565 models)
8.1. RF 3D Input(DTV)
8.3. HDMI Input(1.3)
- Connect the HDMI cable & receiving the HDMI signal
- Press “3D” key of remote control & select 3D format below.
No.
Resolution
H-freq(kHz) V-freq.(kHz)
Pixel clock(MHz)
Proposed
3D input proposed mode
1
1280*720
89.9 / 90
59.94/60
148.35/148.5
HDTV 720P
Frame packing (720 60p)
2
1280*720
45
60
74.25
HDTV 720P
Side by Side(half), Top & Bottom
3
1920*1080
53.95 / 54
23.98 / 24
148.35/148.5
HDTV 1080P
Frame packing (1080 24p)
4
1920*1080
67.5
60
148.5
HDTV 1080P
Side by Side(half), Top & bottom
5
1920*1080
33.7
60
74.25
HDTV 1080i
Side by Side(half), Top & Bottom
6
1920*1080
27
24
74.25
HDTV 1080P
Side by Side(half), Top & Bottom
7
1920*1080
33.7
30
74.25
HDTV 1080P
Side by Side(half), Top &Bottom
No.
Resolution H-freq(kHz) V-freq.(Hz)
Pixel clock(MHz)
Proposed
3D input proposed mode
1
1280*720
45.00
60.00
74.25
HDTV 720P
Side by Side, Top & Bottom
2
1920*1080
33.75
60.00
74.25
HDTV 1080I
Side by Side, Top & Bottom
3
1920*1080
27.00
24.00
74.25
HDTV 1080P
Side by Side, Top & Bottom
4
1920*1080
33.75
30.00
74.25
HDTV 1080P
Side by Side, Top & Bottom
5
1920*1080
67.50
60.00
148.5
HDTV 1080P
Side by Side, Top & Bottom, 
Single Frame Sequential
No.
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
3D input proposed mode
1
1280*720
37.5
50
74.25
HDTV 720P
Side by Side, Top & Bottom
2
1920*1080
28.125
50
74.25
HDTV 1080I
Side by Side, Top & Bottom
8.2. HDMI Input (V1.4a)
- When connect the cable on TV or change the input mode, 3D display on automatically
- Display OSD information -> 1920x2205 [1080p 24], 1280x1470 [720p 60
]
- 8 -
8.6. 3D Input mode
8.5. RGB-PC Input
No.
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
3D input proposed mode
1
1920*1080
66.587
59.93
138.625
HDTV 1080P
Side by Side, Top & Bottom
No.
Side by Side
Top & Bottom
Single Frame Sequential
Frame Packing
1
8.4. USB Input
(1) Movie
No.
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
3D input proposed mode
Proposed
1
1920*1080
33.75
30
74.25
Side by Side
HDTV 1080P
Top & Bottom
(2) MPO Picture 3D : when selecting the MPO file, Automatically 3D on
(3) 3D Demo in store mode
No.
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
3D input proposed mode
1
1920*1080
33.75
30.00
74.25
HDTV 1080P
Side by Side
 
 
LLLLL
 
8.7. DLNA
No.
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remark
1
1920*1080
33.75
30
74.25
HDTV 1080P
Side by Side, Top & Bottom
- 9 -
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet applies to LA21B/C Chassis applied LCD TV 
all models manufactured in TV factory.
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 protect test instrument.
(2) Adjustment must be done in the correct order. 
(3)  The adjustment must be performed in the circumstance of 
25 ±5 °C of temperature and 65±10% of relative humidity if 
there is no specific designation.
(4)  The  input  voltage  of  the  receiver  must  keep  100~240V, 
50/60Hz.
(5)  At first Worker must turn on the SET by using Power Only 
key.
(6)  The receiver must be operated for about 5 minutes prior to 
the adjustment when module is in the circumstance of over 
15 °C
      In case of keeping module is in the circumstance of 0°C, it 
should be placed in the circumstance of above 15°C for 2 
hours
      In case of keeping module is in the circumstance of below 
-20°C,  it  should  be  placed  in  the  circumstance  of  above 
15°C for 3 hours.
[Caution] 
When  still  image  is  displayed  for  a  period  of  20  minutes  or 
longer (especially where W/B scale is strong.
Digital  pattern  13ch  and/or  Cross  hatch  pattern  09ch),  there 
can some afterimage in the black level area
3. Adjustment items
3.1. Main PCBA Adjustments
(1)  ADC  adjustment:  Component  480i,  1080p  /  RGB-PC 
1080p
(2) EDID download: HDMI and RGB-PC
●  Above  adjustment  items  can  be  also  performed  in  Final 
Assembly  if  needed.  Both  Board-level  and  Final  assembly 
adjustment  items  can  be  check  using  In-Start  Menu  (1.
Adjust  Check).  Component  1080p  and  RGB-PC Adjust  will 
be calculated by 480i adjust value.
3.2. Final assembly adjustment
(1) White Balance adjustment
(2) RS-232C functionality check
(3) Factory Option setting per destination
(4) Shipment mode setting (In-Stop)
(5) GND and HI-POT test
3.3. Appendix
(1) Shipment conditions
(2) Tool option menu
(3) USB Download (S/W Update, Option and Service only)
(4) Preset CH Information
4. MAIN PCBA Adjustments
4.1. ADC Adjustment
4.1.1. Overview
▪  ADC  adjustment  is  needed  to  find  the  optimum  black  level 
and gain in Analog-to-Digital device and to compensate RGB 
deviation.
4.1.2. Equipment & Condition
(1) Protocol: RS-232C
(2) Inner Pattern
- Resolution : 1080p(Comp) / 1024*768(RGB)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
4.1.3. Adjustment
4.1.3.1. Adjustment method
-  Connect  to  Jig  by  using  RS-232,  adjust  Component  and 
RGB
● Manual adj (If needed in Final Assembly)
- Required equipment : Adjustment R/C
- Enter Service Mode by pushing “ADJ” key,
Calibration]
4.1.3.2. Adj. protocol
-  Connect  to  Jig  by  using  RS-232,  adjust  Component  and 
RGB
Protocol CMD 1 CMD 2 Data 1 Data 2
Remark
Enter 
adj 
mode
a
a
00
00
When 
transfer 
the  ‘Mode 
In’,Carry the 
command.
Start 
ADC adj
a
d
00
10
Automatically 
adjustment 
(Use internal 
pattern)
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