LG 37LT760H (CHASSIS:LD2FF) Service Manual ▷ View online
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No.
Item
Specification
Remarks
4
Scart Input (1EA)
PAL, SECAM
Scart jack is Full scart and support
ATV/DTV-Out
(not support MNT-Out)
5
RS-232C
SVC, Control, Power outlet
(Selectable 12V/1A or 5V/2A)
6
RGB Input (1EA)
RGB-PC
Analog (D-SUB 15PIN)
7
HDMI Input (3EA)
HDMI1-DTV
HDMI2-DTV
HDMI3-DTV
HDMI1 : ARC Support(HDMI Version 1.4)
Support HDCP
8
Audio Input (1EA)
RGB/DVI Audio
L/R Input
9
SPDIF out (1EA)
SPDIF out
10
USB (2EA)
EMF, DivX HD,
For SVC (download)
JPEG, MP3, DivX HD
11
Ethernet Connect(2EA)
Ethernet Connect
WOL Support
12
CI Slot(1EA)
CI
EU PPV CH. Support
13
Clock LED
Clock LED
Clock Display
14
Ext. Speaker out(1EA)
Ext. Speaker out
Stereo 1W / 8Ω, Variable
Ext. Volume control(1EA) Ext. volume control
5. RGB input (PC)
No.
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remark
1
720*400
31.468
70.08
28.321
For only DOS mode
2
640*480
31.469
59.94
25.17
VESA
Input 848*480 60Hz, 852*480 60Hz
→ 640*480 60Hz Display
3
800*600
37.879
60.31
40.00
VESA
4
1024*768
48.363
60.00
65.00
VESA(XGA)
5
1360*768
47.72
59.8
84.75
WXGA
6
1920*1080
66.587
59.93
138.625
WUXGA
FHD model
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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
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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
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