LG 55LV4400 Schematic
MODEL : 55LV4400_LC550EUH-RDA2-8R1
P/NO：SG-0000039 (REV01) Printed in Taiwan
Table of Contents
CONTENTS PAGE
Sections
1. Features 1-1
2. Specifications 2-1
3. On Screen Display 3-1
4. Factory Preset Timings 4-1
5. Pin Assignment 5-1
6. Main Board I/O Connections 6-1
7. Theory of Circuit Operation 7-1
8. Waveforms 8-1
9. Trouble Shooting 9-1
10. Block Diagram 10-1
11. Spare parts list 11-1
12. Complete Parts List 12-1
Appendix
1. Main Board Circuit Diagram
2. Main Board PCB Layout
3. Assembly Explosion Drawing
55LV4400 Service Manual
Chapter 1 Features
1. Built in TV channel selector for TV viewing.
2. Simultaneous display of PC and TV images.
3. Connectable to PC’s analog RGB port.
4. Built in HDTV, composite video, HDMI, ATV and DTV, Audio line out, Audio
optical out.
5. Built in auto adjust function for automatic adjustment of screen display.
6. High quality 1920X1080 pixel by pixel display.
7. Smoothing function enables display of smooth texts and graphics even if
image with resolution lower than 1920X1080 is magnified.
8. Advanced video functions for personal favor.
9. Picture In Picture (PIP) function to show TV or VCR images.
10. Power saving to reduce consumption power too less than 1W.
11. On Screen Display: user can define display mode (i.e. color, brightness,
contrast, sharpness, backlight), sound setting, PIP, TV channel program,
aspect and gamma or reset all setting.
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Chapter 2 Specification
1. TFT-LCD CHARACTERISTICS
Model Name:
Active Screen Size 54.64 inches(1387.8mm) diagonal
Outline Dimension 1255.6(H) x 726.4(V) x 10.8 (D) (Typ.)
Pixel Pitch 0.630 mm x 0.630 mm
Pixel Format 1920 horiz. by 1080 vert. Pixels, RGB stripe arrangement
Color Depth
Drive IC Data Interface
Source D-IC
Gate D-IC Line on Glass (LOG) Through Source D-IC
Luminance, White 400 cd/m2 (Center 1point,Typ.)
Viewing Angle (CR>10) Viewing angle free ( R/L 178 (Min.), U/D 178 (Min.))
Power Consumption
Weight 14.5Kg (Typ.)
LGD LC550EUH-SDA1 (Vendor: LG. Philips LCD Co., Ltd)
Item Specification
8-bit, 16.7 M colors (
Output)
8-bit mini-LVDS, and control signals TTL
Total 126.1 W (Typ.) [(Logic=6.1W, Backlight=120W
(ExtVbr_B=100%))
※
1.06B colors @ 10 bit (D) System
Display Mode Transmissive mode, Normally black
Surface Treatment
Hard coating(3H), Anti-glare treatment of the front polarizer
(Haze 10%)
2. Input Connectors
1x Co-axial RF (ATSC/QAM/NTSC)
3x HDMI™** with HDCP
1x Component YPbPr plus Stereo Audio
(Composite Video/Audio share with component YPbPr)
1x RGB PC plus Stereo Audio
Service port (USB)
Multi Media (USB) (shared with Service port)
3. Output Connectors
SPDIF Out (Optical Audio) , Phone Jack (Audio OUT)
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4. POWER SUPPLY
Input Voltage Level: 100~240 Vac, 50/ 60 Hz
Power Consumption: 175W (Max.)
Power OFF: to less than 1W (Max.) (at 120 Vac)
5. SPEAKER
Built in Speakers:6Ω/10W (max) X 2 way.
6. ENVIRONMENT
Operating Temperature: 5℃~35℃ (Ambient)
Operating Humidity: Ta= 35℃, 90%RH(Non-condensing)
Operating Altitude: 0 - 14,000 ft
Non-Operating: 4000 ft
7. DIMENSIONS (Physical dimension)
(Unit: mm)
Display Module Display Module + Base
a. Height 796.4 850.0
b. Width 1287.9 1287.9
c. Depth 49.9 276.0
8. Weight
a. Net: 21.2 ±1.0 kg (without base)
23.5 ±1.0 kg (with base)
b. Gross: 28 ±1.0 kg
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9. Precautions
Please pay attention to the followings when you use this TFT LCD module.
9-1. Mounting Precautions
(1) You must mount a module using holes arranged in four cornersor four sides.
(2) You should consider the mounting structure so that uneven force (ex. Twisted
stress) is not applied to the module. And the case on which a module is
mounted should have sufficient strength so that external force is not
transmitted directly to the module.
(3) Please attach the surface transparent protective plate to the surface in order to
protect the polarizer. Transparent protective plate should have sufficient
strength in order to the resist external force.
(4) You should adopt radiation structure to satisfy the temperature specification.
(5) Acetic acid type and chlorine type materials for the cover case are not
desirable because the former generates corrosive gas of attacking the
polarizer at high temperature and the latter causes circuit break by
electro-chemical reaction.
(6) Do not touch, push or rub the exposed polarizers with glass, tweezers or
anything harder than HB pencil lead. And please do not rub with dust clothes
with chemical treatment. Do not touch the surface of polarizer for bare hand or
greasy cloth.(Some cosmetics are detrimental to the polarizer.)
(7) When the surface becomes dusty, please wipe gently with absorbent cotton or
other soft materials like chamois soaks with petroleum benzine.
Normal-hexane is recommended for cleaning the adhesives used to attach
front / rear polarizers. Do not use acetone, toluene and alcohol because they
cause chemical damage to the polarizer.
(8) Wipe off saliva or water drops as soon as possible. Their long time contact
with polarizer causes deformations and color fading.
(9) Do not open the case because inside circuits do not have sufficient strength.
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9-2. Operating Precautions
(1) The spike noise causes the mis-operation of circuits. It should be lower than
following voltage:
V=±200mV (Over and under shoot voltage)
(2) Response time depends on the temperature. (In lower temperature, it
becomes longer.)
(3) Brightness depends on the temperature. (In lower temperature, it becomes
lower.) And in lower temperature, response time(required time that brightness
is stable after turned on) becomes longer.
(4) Be careful for condensation at sudden temperature change. Condensation
makes damage to polarizer or electrical contacted parts. And after fading
condensation, smearor spot will occur.
(5) When fixed patterns are displayed for a long time, remnant image is likely to
occur.
(6) Module has high frequency circuits. Sufficient suppression to the
electromagnetic interference shall be done by system manufacturers.
Grounding and shielding methods may be important to minimized the
interference.
(7) Please do not give any mechanical and/or acoustical impact to LCM.
Otherwise, LCM can’t be operated its full characteristics perfectly.
(8) A screw which is fastened up the steels should be a machine screw. (if not, it
causes metallic foreign material and deal LCM afatal blow)
(9) Please do not set LCD on its edge.
9-3. Electrostatic Discharge Control
Since a module is composed of electronic circuits, it is not strong to electrostatic
discharge. Make certain that treatment persons are connected to ground through
wrist band etc. And don’t touch interface pin directly.
9-4. Precautions for Strong Light Exposure
Strong light exposure causes degradation of polarizer and color filter.
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9-5. Storage
When storing modules as spares for a long time, the following precautions are
necessary.
(1) Store them in a dark place. Do not expose the module to sunlight or
fluorescent light. Keep the temperature between 5°C and 35°C at normal
humidity.
(2) The polarizer surface should not come in contact with any other object. It is
recommended that they be stored in the container in which they were shipped.
9-6. Handling Precautions for Protection Film
(1) The protection film is attached to the bezel with a small masking tape. When
the protection film is peeled off, static electricity is generated between the film
and polarizer. This should be peeled off slowly and carefully by people who
are electrically grounded and with well ion- blown equipment or in such a
condition, etc.
(2) When the module with protection film attached is stored for a long time,
sometimes there remains a very small amount of glue still on the bezel after
the protection film is peeled off.
(3) You can remove the glue easily. When the glue remains on thebezel surface
or its vestige is recognized, please wipe them off with absorbent cotton waste
or other soft material like chamois soaked with normal- hexane.
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Chapter 3 On Screen Display
On Screen Display (OSD) is a friendly interface providing the function adjusting in our system.
Customers could operate it only by few buttons. There is the introduction of the OSD.
<Side>
A. LED indicator display on the front
LED indicator Status Remark
Off AC power off by disconnecting the power cord
Blue Power on
Red Standby/Power Off
B. Specification and explanation of user control panel on the side
Buttons 1 2 3 4 5 6 7 8
Name
i. Standby/power on
After AC on, by pressing button, LED indicator turns to blue to indicate
power on. To turn off this device, press this button again.
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ii. HOME operation
Press button to activate the OSD. Press button to exit.
iii. Channel Selection
By pressing and buttons, channel should be selected. At the
time, channel should increase with button and decrease with
button. When the “MENU” is activated, it can be navigated up by button
and down by button.
iv. Volume Adjustment
By pressing and buttons, volume should be available to change
from maximum to minimum. At the time, volume should increase with
button and decrease with button, and volume shift should be smooth.
When the “MENU” is activated, it can be navigated right by button and
left by button.
v. Input Change
This button is to cycle through the input sources by the following sequence:
TV , AV(Composite)*, COMPONENT, RGB ,HDMI1 , HDMI2, HDMI 3
vi. Enter Button
When any “MENU” is activated ,it can enter the sub menu or focus option. Or
show the content information.
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On Screen Display
Operation:
Main unit button
LGE 2011 UI Adjustment
Main Menu
Channel
Picture
Audio
Time
Option
Lock
Input
My Media
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Channel
Picture
A. Auto Tuning
B. Manual Tuning
a. Type: TV, CATV, DTV, CADTV
b. Channel
c. Add / Delete
d. Close
C. Channel Edit
a. Type: TV, CATV, DTV, CADTV
b. Channel Change
c. Add / Delete / Remove Favorite
A. Aspect Ratio (Set by Program, 4:3, 16:9, Zoom, Cinema
Zoom, Just Scan)
Source TV/AV/Comp/HDMI AV
Resolution 480i/p 720p, 1080i/p Only 480i
Set by Program
4:3
16:9
Zoom
Cinema Zoom
Just Scan
Yes Yes N/A
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
Yes Yes Yes
N/A Yes N/A
B. Energy Sa ving (Auto, Off, Minimum, Medium, Maximum,
Screen Off)
C. Picture Mode (Vivid, Standard, Cinema, Sport, Game)
a. Backlight (0 ~ 100) [80]
b. Contrast (0 ~ 100) [90]
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c. Brightness (0 ~ 100) [50]
d. Sharpness (0 ~ 100) [60]
e. Color (0 ~ 100) [60]
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f. Tint (R50 ~ G50) [0]
g. Advanced Control
g-1. Color T emperature (Cool, Medium, Warm)
g-2. Fresh Contrast (Off, Low, Medium, High)
g-3. Fresh Color (Off, Low, High)
g-4. Noise Reduction (Off, Low, Medium, High)
g-5. Gamma (Low, Medium, High)
g-6. Black Level (Low, High)
g-7. Eye Care (Off, On)
g-8. Real Cinema (Off, On)
g-9. TruMotion 120Hz (Off, Low, Medium, High)
h. Reset
D. Screen (RGB-PC)
a. Resolution (1024X768, 1280X768, 1360X768)
b. Auto Config.
c. Position (H Position, V Position)
d. Size (-30 ~ 30) [0]
Audio
e. Phase (-32 ~ 31) [0]
f. Reset
A. Balance (L50 ~ R50) [0]
B. Sound Mod e (Standard, Music, Cinema, Sport, Game)
a. Treble (0 ~ 100) [50]
b. Bass (0 ~ 100) [50]
c. Reset
C. TV Speaker (On, Off)
D. Digital Audio Out (Off, Dolby Digital, PCM)
E. Analog Audio Out (Fixed, Variable)
Time
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A. Clock (Auto, Manual)
a. Year (2011 ~ 2035)
b. Month (1 ~ 12)
c. Date (1 ~ 31)
d. Hour (12AM ~ 11PM)
e. Minute (0 ~ 59)
f. Time Zone (Eastern, Central, Mountain, Pacific,
Alaska, Hawaii) (US model and MX model)
g. Time Zone (Eastern, Central, Mountain, Pacific, New
Foundland, Atlantic) (Canada model only)
h. Daylight Saving (Auto, On, Off)
B. Off Time
a. Repeat (Off, Once, Everyday, Mon~Fri, Mon~Sat,
Weekend, Sunday, )
b. Hour (12AM ~ 11PM)
c. Minute (0 ~ 59)
C. On Time
a. Repeat (Off, Once, Everyday, Mon~Fri, Mon~Sat,
Weekend, Sunday)
b. Hour (12AM ~ 11PM)
c. Minute (0 ~ 59)
d. Input (TV, AV, Component, RGB-PC, HDMI1, HDMI2,
HDMI3 )
e. Channel
f. Volume (0 ~ 100)
D. Sleep Timer (Off, 10 min, 20 min, 30 min, 60 min, 90 min,
120 min, 180 min, 240 min)
E. Auto Sleep (Off, On)
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Option
A. Language
a. Menu (English, Spanish, French)
b. Audio (English, Spanish, French)
B. Input Label
a. AV (VCR, DVD, Set Top Box, Satellite, Cable Box,
Game, PC, HD-DVD, Blu-Ray)
b. Component (VCR, DVD, Set T op Box, Satellite, Cable
Box, Game, PC, HD-DVD, Blu-Ray)
c. RGB-PC (VCR, DVD, Set Top Box, Satellite, Cable
Box, Game, PC, HD-DVD, Blu-Ray)
d. HDMI1 (VCR, DVD, Set Top Box, Satellite, Cable
Box, Game, PC, HD-DVD, Blu-Ray)
e. HDMI2 (VCR, DVD, Set Top Box, Satellite, Cable
Box, Game, PC, HD-DVD, Blu-Ray)
f. HDMI3 (VCR, DVD, Set Top Box, Satellite, Cable
Box, Game, PC, HD-DVD, Blu-Ray)
C. Key Lock (Off, On)
D. Caption (Off, On)
a. Mode (CC1 ~ Text4, Service1 ~ Service6)
b. Digital Option (Set by Program, Custom)
b-1. Size (Small, Standard, Large)
b-2. Font (Font1 ~ Font8)
b-3. Text Color (White, Black, Red, Green, Blue,
Yellow, Magenta, Cyan)
b-4. Text Opacity (Solid, Flash, Translucent,
Transparent)
b-5. Bg Color (White, Black, Red, Green, Blue, Yellow,
Magenta, Cyan)
b-6. Bg Opacity (Solid, Flash, Translucent,
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Transparent)
b-7. Edge Type (None, Uniform, Raised, Depressed,
Left Shadow, Right Shadow)
b-8. Edge Color (White, Black, Red, Green, Blue,
Yellow, Magenta, Cyan)
E. Initial Setting (In Store, Home)
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Lock
A. Lock System (Off, On) (default password: 0000)
B. Set Password
a. New
b. Confirm
C. Block Channel
a. Type: TV, CATV, DTV, CADTV
b. Channel Change
c. Block, Un-block
D. Movie Rating (Off, X, NC-17, R, PG-13, PG, G)
E. TV Rating-Children (US model only)
a. Age (Off, TV-Y7, TV-Y)
b. Fantasy Violence (Off, TV-Y7)
F. TV Rating-General (US model only)
a. Age (Off, TV-MA, TV-14, TV-PG, TV-G)
b. Dialogue (Off, TV-14, TV-PG)
c. Language (Off, TV-MA, TV-14, TV-PG)
d. Sex (Off, TV-MA, TV-14, TV-PG)
e. Violence (Off, TV-MA, TV-14, TV-PG)
G. TV Rating-English (Off, E, C, C8+, G, PG, 14+, 18+)
(Canada model only)
H. TV Rating-French (Off, E, G, 8ans+, 13ans+, 16ans+,
18ans+) (Canada model only)
I. Downloadable Rating
J. Input Block
a. AV (Off, On)
b. Component (Off, On)
c. RGB-PC (Off, On)
d. HDMI1 (Off, On)
e. HDMI2 (Off, On)
f. HDMI3 (Off, On)
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Input
TV
AV
Component
RGB-PC
HDMI-1
HDMI-2
HDMI-3
My Media
A. Photo List
a. Slideshow Mode (Single, Sequence, Shuffle)
b. Repeat (Off, On)
c. Sort By (Photo Date, File Date, File A-Z)
d. Duration (5 ~ 32)
e. Slideshow Effect (Random, Dissolve, Wipe Right,
Wipe Left, Wipe Up, Wipe Down, Box In, Box Out)
f. Thumbnail Size (Small, Medium, Large)
g. Information (Off, On)
[5]
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QMenu
A. Aspect Ratio (Set By Program, 4:3, 16:9, Zoom, Cinema
Zoom, Just Scan)
B. Backlight (0 ~ 6)
C. Picture Mode (Vivid, Standard, Cinema, Sport, Game)
D. Sound Mode (Standard, Music, Cinema, Sport, Game)
E. Caption (Off, On)
F. Multi Audio (Mono, Stereo, SAP)
G. Sleep T imer (Off, 10 min, 20 min, 30 min, 60 min, 90 min,
120 min, 180 min, 240 min)
H. Del/Add/Fav (Add, Favorite, Delete)
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Chapter 4 Factory preset timings
This timing chart is already preset for the TFT LCD analog & digital display monitors.
PC analog preset modes
No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed
PC
1 640*350 31.468 70.09 25.17 EGA Х
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 1280*768 47.776 59.870 79.5
7 1360*768 47.712 60.015 85.50 VESA (WXGA) Х
8 1280*1024 63.981 60.020 108.00 VESA (SXGA) O
9 1600*1200 75.00 60.00 162 VESA (UXGA) X
10 1920*1080 66.587 59.934 148.5 HDTV 1080P O
CVT(WXGA)
DDC
Resolution through RGB (15-Pin D connector)
Parameters Horizontal Values (Pixels) Vertical Values (Lines)
Address 1920 1080
Х
Front Porch 48 3
Sync Width 32 5
Back Porch 80 23
Total 2080 1111
Frequency 66.587 KHz 59.934 Hz
Sync Polarity P N
Pixel Rate (MHz) 138.5
Refresh Rate (Hz) 60
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HD video digital preset modes at HDMI
Mode No. Resolution
1 480i
2 480p
3 720p
4 1080i
5 1080p
Video input
Mode No. Resolution
1 480i
2 480p
3 720p
4 1080i
5 1080p
Color temperature & Speciation
R.G.B. Color temperature:
13000K
(Cool)
x 0.269 0.285 0.313 ±0.030
y 0.273 0.293 0.329 ±0.030
Y N/A N/A N/A N/A
9300K
(Medium)
6500K
Tolerance
(Warm)
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Chapter 5 Pin Assignment
1 Video Graphics Array (VGA) connector pin assignment
The TFT LCD analog display monitors use a 15 Pin Mini D-Sub connector as video input
source.
Pin Description
1 Red
2 Green
3 Blue
4 Ground
5 Ground
6 R-Ground
7 G-Ground
8 B-Ground
9 +5V for DDC
10 Ground
11 No Connection
12 (SDA)
13 H-Sync (Composite Sync)
14 V-Sync
15 (SCL)
1
11
5
106
15
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2 High Definition Multimedia Interface (HDMI) connector pin assignment
PIN SIGNAL ASSIGNMENT
1 TMDS Data2+
2 TMDS Data2 Shield
3 TMDS Data2-
4 TMDS Data1+
5 TMDS Data1 Shield
6 TMDS Data1-
7 TMDS Data0+
8 TMDS Data0 Shield
9 TMDS Data0-
10 TMDS Clock+
11 TMDS Clock Shield
12 TMDS Clock-
13 CEC
14 Reserved (N.C on device)
15 SCL
16 SDA
17 DDC/CEC Ground
18 +5V Power
19 Hot Plug Detect
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3 Signal Specification
3.1 F-Type TV RF connector
a. Signal Level 70dBµV typical
b. System: NTSC
c. Frequency: 55~801MHz (NTSC)
3.2 PC connector 15 pin male D-sub connector
a. Pin Assignment Refer to Section 5.1
b. Signal Level Video (R, G, B): Analog 0.7Vp-p/75
Sync (H, V): TTL level
c. Sync Type TTL (Separate / Composite) or Sync. On Green
d. Sync polarity Positive or Negative
e. Video Amplitude RGB: 0.7Vp-p
f. Frequency H: support to 30K~70KHz
V: support to 60~85Hz
Pixel Clock: support to 162MHz
3.3 AV/Composite Video (CVBS)
a. Signal Level Video : Analog 1Vp-p/75
Video (sync): Analog 0.286p-p/75
Sync (H+V): 0.3V below Video (Y)
b. Frequency: H: 15.734Khz V: 60HZ (NTSC)
c. Connector type: RCA Jack
3.4 HDMI Signal:
a. Pin Assignment Refer to HDNI Pin Assignment
b. Type A
c. Polarity Positive or Negative
d. Frequency
H: 15.734KHz V: 60Hz (NTSC-480i)
H: 31KHz V: 60Hz (NTSC-480p)
H: 45KHz V: 60Hz (NTSC-720p)
H: 33KHz V: 60Hz (NTSC-1080i)
H: 67.5KHz V: 60Hz (NTSC-1080P)
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3.5 Component signal
a. Frequency H: 15.734KHz V: 60Hz (NTSC-480i)
H: 31KHz V: 60Hz (NTSC-480p)
H: 45KHz V: 60Hz (NTSC-720p)
H: 33KHz V: 60Hz (NTSC-1080i)
H: 67.5KHz V: 60Hz (NTSC-1080P)
b. Signal level Y: 1Vp-p; Pb: ±0.350Vp-p; Pr: ±0.350Vp-p
c. Impedance 75
d. Connector type: RCA Jack
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Chapter 6 Main Board I/O Connections
J1 CONNECTION [MAIN BD TO POWER BD]
Pin Description
1 +5VSB
2 +5VSB
3 +5VSB
4 GND
5 GND
6 GND
7 GND
8 +12V
9 +12V
10 POWER SW ON OFF
11 BL ON OFF
12 PWM DIM
J2 CONNECTION [DOWNLOAD AND DEBUGGING]
Pin Description
1 +3V3SB
2 U0RX
3 U0TX
4 GND
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J3 CONNECTION [JTAG INTERFACE]
Pin Description
1 AV33
2 TVTREF#1
3 GND
4 JTRST#
5 GND
6 JTDI
7 GND
8 JTMS
9 GND
10 JTCK
11 GND
12 Pull High AV33
J14 C
13 GND
14 JTDO
15 GND
16 N.C.
17 GND
18 JTAG DBGRQ
19 GND
20 JTAG DBGACK
ONNECTION
[Main Bd To IR/Light Sensor/LED Bd]
Pin Description
1 OIRI_in
2 5VSB
3 GND
4 LS_SCL
5 LS_SDA
6 DETECT
7 RED_LED
8 BLUE_LED
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J9 CONNECTION [ LVDS1 ]
Pin Description Pin Description
1 OPC_EN 21 R4CLKN
2 LVDSVDD 22 R4CN
3 LVDS_OPTION 23 R4BP
4 LVDSVDD 24 R4AP
5 BIT_SEL 25 R4BN
6 LVDSVDD 26 R4AN
7 VBR_OUT27 27 GND
8 LVDSVDD 28 GND
9 EXT_BR28 29 R3EP
10 PANEL_IO1 30 R3DP
11 SCAN_BLK2 31 R3EN
12 PANEL_IO3 32 R3DN
13 GND 33 R3CLKP
14 GND 34 R3CP
15 R4EP 35 R3CLKN
16 R4DP 36 R3CN
17 R4EN 37 R3BP
18 R4DN 38 R3AP
19 R4CLKP 39 R3BN
20 R4CP 40 R3AN
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J10 CONNECTION [ LVDS2 ]
Pin Description Pin Description
1 GND 16 GND
2 GND 17 R1EP
3 R2EP 18 R1DP
4 R2DP 19 R1EN
5 R2EN 20 R1DN
6 R2DN 21 R1CLKP
7 R2CLKP 22 R1CP
8 R2CP 23 R1CLKN
9
R2CLKN
10 R2CN 25 R1BP
11 R2BP 26 R1AP
12 R2AP 27 R1BN
13 R2BN 28 R1AN
14 R2AN 29 GND
15 GND 30 GND
J15 CONNECTION [MAIN BD TO SPEAKER ]
Pin Description
1 R+
2 R3 L+
4 L-
24
R1CN
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TCN3
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TCN4 CONNECTION
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