LG 37LT760H (CHASSIS:LD2FF) Service Manual ▷ View online
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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
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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 setting at MENU Mode of TV(Instart -> menu ->
Network Setup)
▪ Setting automatic IP
▪ Setting state confirmation
▪ 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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