DOWNLOAD LG 37LT760H (CHASSIS:LD2FF) Service Manual ↓ Size: 6.97 MB | Pages: 55 in PDF or view online for FREE

Model
37LT760H (CHASSIS:LD2FF)
Pages
55
Size
6.97 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
37lt760h-chassis-ld2ff.pdf
Date

LG 37LT760H (CHASSIS:LD2FF) Service Manual ▷ View online

- 8 -
6. HDMI Input
6.1. DTV mode
No.
Resolution
H-freq.(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Proposed
1.
720*480
31.469 / 31.5
59.94 / 60
27.00/27.03
SDTV 480P
2.
720*576
31.25
50
54
SDTV 576P
3.
1280*720
37.500
50
74.25
HDTV 720P
4.
1280*720
44.96 / 45
59.94 / 60
74.17/74.25
HDTV 720P
5.
1920*1080
33.72 / 33.75
59.94 / 60
74.17/74.25
HDTV 1080I
6.
1920*1080
28.125
50.00
74.25
HDTV 1080I
7.
1920*1080
26.97 / 27
231.97 / 24
74.17/74.25
HDTV 1080P
FHD model
8.
1920*1080
33.716 / 33.75
29.976 / 30.00
74.25
HDTV 1080P
FHD model
9.
1920*1080
56.250
50
148.5
HDTV 1080P
FHD model
10.
1920*1080
67.43 / 67.5
59.94 / 60
148.35/148.50
HDTV 1080P
FHD model
6.2. PC mode
No.
Resolution
H-freq.(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Proposed
1.
720*400
31.468
70.08
28.321
HDCP
2.
640*480
31.469
59.94
25.17
VESA
HDCP
3.
800*600
37.879
60.31
40.00
VESA
HDCP
4.
1024*768
48.363
60.00
65.00
VESA(XGA)
HDCP
5.
1360*768
47.72
59.8
84.75
WXGA
HDCP
6.
1280*1024
63.595
60.0
108.875
SXGA
HDCP / FHD model
7.
1920*1080
67.5
60.00
138.625
WUXGA
HDCP / FHD model
- 9 -
ADJUSTMENT INSTRUCTION
1. Application Range
This  spec.  sheet  applies  to  LD2FF  Chassis  applied  LCD TV 
all models manufactured in TV factory.
2. Designation
(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 °C ± 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 AC  100-240 
V~, 50/60 Hz.
(5)  The receiver must be operated for about 5 minutes prior to 
the adjustment when module is in the circumstance of over 
15.
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. MAIN PCBA Adjustments
3.1. ADC Calibration
3.1.1. Overview
ADC  adjustment  is  needed  to  find  the  optimum  black  level 
and gain in Analog-to-Digital device and to compensate RGB 
deviation.
3.1.2. Equipment & Condition
(1) USB to RS-232C Jig
(2)  MSPG-925  Series  Pattern  Generator  (MSPG-925FA, 
pattern - 65)
- Resolution : 1080P Comp1
 
1920*1080 RGB
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7 ± 0.1 Vp-p
- Image
3.1.3. Adjustment method
(1) Adjustment method
-  Don’t need to adjust ADC because there is data in OTP 
and adjusted initially.
3.2. MAC address D/L, CI+ D/L
3.2.1. Equipment & Condition
1) Play file: keydownload.exe
3.2.2. Communication Port connection
1) Key Write: Com 1,2,3,4 and 115200 (Baudrate)
2) Barcode: Com 1,2,3,4 and 9600 (Baudrate)
3.2.3. Download process
1) Select the download items.
2) Mode check: Online Only
3) Check the test process
- DETECT -> MAC -> CI+
4) Play: START
5) Check of result: Ready, Test, OK or NG
6) Printer Out (MAC Address Label)
3.2.4. Communication Port connection
Connect: PCBA Jig → RS-232C Port== PC → RS-232C Port
3.2.5. Download
3.2.6. Inspection
- In INSTART menu, check these keys.
Play: Start 
- 10 -
3.3. LAN Inspection
3.3.1. Equipment & Condition
▪ Each other connection to LAN Port of IP Hub and Jig
3.3.2. LAN inspection solution
▪ LAN Port connection with PCB
▪  Network  setting  at  MENU  Mode  of  TV(Instart  ->  menu  -> 
Network Setup)
▪ Setting automatic IP
▪ Setting state confirmation
→  If automatic setting is finished, you confirm IP and MAC 
Address.
3.4. LAN PORT INSPECTION(PING TEST)
3.4.1. Equipment setting
(1) Play the LAN Port Test PROGRAM.
(2) Input IP set up for an inspection to Test Program.
*IP Number : 12.12.2.2
Connect SET → LAN port == PC → LAN Port
3.4.2. LAN PORT inspection(PING TEST)
(1) Play the LAN Port Test Program.
(2) Connect each other LAN Port Jack.
(3) Play Test (F9) button and confirm OK Message.
(4) Remove LAN cable.
3.5. Model name & Serial number Download
3.5.1. Model name & Serial number D/L
 Press "Power on" key of service remote control.
(Baud rate : 115200 bps)
 Connect RS232 Signal Cable to RS-232 Jack.
 Write Serial number by use RS-232.
 Must check the serial number at Instart menu.
3.5.2. Method & notice
(1) Serial number D/L is using of scan equipment.
(2)  Setting  of  scan  equipment  operated  by  Manufacturing 
Technology Group.
(3)  Serial number D/L must be conformed when it is produced 
in production line, because serial number D/L is mandatory 
by D-book 4.0.
* Manual Download (Model Name and Serial Number)
If the TV set is downloaded by OTA or service man, sometimes 
model name or serial number is initialized.(Not always)
It  is  impossible  to  download  by  bar  code  scan,  so  It  need 
Manual download.
1) Press the "Instart" key of Adjustment remote control.
2) Go to the menu "7.Model Number D/L" like below photo.
3)  Input the Factory model name(ex 42LT760H-ZA) or Serial 
number like photo.
4)  Check  the  model  name  Instart  menu.  →  Factory  name 
displayed. (ex 42LT760H-ZA)
5)  Check  the  Diagnostics.(DTV  country  only)  →  Buyer 
model displayed. (ex 42LT760H-ZA)
3.6. CI+ Key checking method
- Check the Section 3.2
Check  whether  the  key  was  downloaded  or  not  at  ‘In  Start’ 
menu. (Refer to below).
=> Check the Download to CI+ Key value in LGset.
SET
PC
- 11 -
3.6.1. Check the method of CI+ Key value
(1) Check the method on Instart menu
(2) Check the method of RS232C Command 
1) Into the main ass’y mode(RS232: aa 00 00)
2) Check the key download for transmitted command
    (RS232: ci 00 10)
3) Result value
- Normally status for download : OKx
- Abnormally status for download : NGx
3.6.2. Check the method of CI+ key value(RS232)
1) Into the main ass’y mode(RS232: aa 00 00)
2) Check the mothed of CI+ key by command
    (RS232: ci 00 20)
3) Result value
i 01 OK 1d1852d21c1ed5dcx
3.7. WIFI MAC ADDRESS CHECK
(1) Using RS232 Command
(2) Check the menu on in-start
4. Manual Adjustment
*  ADC  adjustment  is  not  needed  because  of  OTP(Auto ADC 
adjustment)
4.1.  EDID(The  Extended  Display  Identification 
Data)/DDC(Display Data Channel) download
4.1.1. Overview
It is a VESA regulation. A PC or a MNT will display an optimal 
resolution  through  information  sharing  without  any  necessity 
of user input. It is a realization of "Plug and Play".
4.1.2. Equipment
-  Since  embedded  EDID  data  is  used,  EDID  download  JIG, 
HDMI cable and D-sub cable are not need.
- Adjustment remote control
4.1.3. Download method
(1)  Press  "ADJ"  key  on  the Adjustment  remote  control  then 
select "12.EDID D/L", By pressing "Enter" key, enter EDID 
D/L menu.
(2)  Select  "Start"  button  by  pressing  "Enter"  key,  HDMI1/ 
HDMI2/ HDMI3/ HDMI4/ RGB are writing and display OK 
or NG.
4.1.4. EDID DATA
▪ HDMI_EDID DATA_2D
▪ RGB_EDID
H-freq(kHz)
V-freq.(Hz)
Transmission
[A][I][][Set ID][][20][Cr]
[O][K][X] or [NG]
CMD 1
CMD 2
Data 0
A
A
0
0
CMD 1
CMD 2
Data 0
C
I
1
0
CMD 1
CMD 2
Data 0
A
A
0
0
CMD 1
CMD 2
Data 0
C
I
2
0
 
CI+ Key Value
For Analog
For HDMI EDID
D-sub to D-sub
DVI-D to HDMI or HDMI to HDMI
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
A0
5A
78
0A
EE
91
A3
54
4C
99
26
0x02 0F
50
54
A1
08
00
31
40
45
40
61
40
71
40
81
80
0x03 01
01
01
01
01
01
02
3A
80
18
71
38
2D
40
58
2C
0x04 45
00
A0
5A
00
00
00
1E
66
21
50
B0
51
00
1B
30
0x05 40
70
36
00
A0
5A
00
00
00
1E
00
00
00
FD
00
3A
0x06 3E
1F
53
10
00
0A
20
20
20
20
20
20
0x07
01 ⓔ1
0x00 02
03
26
F1
4E
10
9F
04
13
05
14
03
02
12
20
21
0x01 22
15
01
26
15
07
50
09
57
07
0x02
E3
05
00
00
00
1D
80
18
71
1C
16
20
58
2C
0x03 25
00
A0
5A
00
00
00
9E
01
1D
00
80
51
D0
1A
20
0x04 6E
88
55
00
A0
5A
00
00
00
1A
02
3A
80
18
71
38
0x05 2D
40
58
2C
45
00
A0
5A
00
00
00
1E
66
21
50
B0
0x06 51
00
1B
30
40
70
36
00
A0
5A
00
00
00
1E
00
00
0x07 00
00
00
00
00
00
00
00
00
00
00
00
00
00
00 ⓔ2
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
68
A0
5A
78
0A
EE
91
A3
54
4C
99
26
0x02 0F
50
54
A1
08
00
31
40
45
40
61
40
71
40
81
80
0x03 01
01
01
01
01
01
02
3A
80
18
71
38
2D
40
58
2C
0x04 45
00
A0
5A
00
00
00
1E
66
21
50
B0
51
00
1B
30
0x05 40
70
36
00
A0
5A
00
00
00
1E
00
00
00
FD
00
3A
0x06 3E
1E
53
10
00
0A
20
20
20
20
20
20
0x07
00 ⓔ3
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