13.6. USB Problems ............................................................................................................... 52
13.7. No Sound Problem .........................................................................................................
13.8. No Sound Problem at Headphone ................................................................................. 54
13.9. Standby On/Off Problem ...............................................................................................
13.10.No Signal Problem .................................................................................................... 55
1. INTRODUCTION
17MB82S mainboard is driven by MediaTek MT5820. This IC is capable of handling Video
and audio processing, Scaling-Display processing, 3D comb filter, OSD and text
processing, LVDS/mini-LVDS transmitting, channel and MPEG2/4 decoding, integrated
DVB-T/C demodulator and media center functionality.
TV supports PAL, SECAM, NTSC colour standards and multiple transmission standards as
B/G, D/K, I/I’, and L/L’ including German and NICAM stereo. Also DVB T, DVB-C are
supported internal demoulators of MediaTek IC and DVB-S/S2 is supported with externall
demodulator.
Sound system output is supplying max. 2x8W ( less 10%THD at max output) for stereo
8 speakers.
Supported peripherals are:
1 RF input VHF I, VHF III, UHF @ 75Ohm(Common)
1 Side AV (CVBS, R/L_Audio)
1 SCART socket(Common)
1 PC input(Common)
2 HDMI 1.3 input(1 HDMI input is common, 1 input is optional)
1 S/PDIF output(Optional)
1 Headphone(Optional)
1 Common interface(Common)
2 USB(1 USB input is common, 1 USB input is optional)
1 On-board Keypad(Optional)
1 External TouchPad(Optional)
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1.1. GeneralBlockDiagram
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1.2. MB82SPlacementofBlocks
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1. TUNER(MXL601)
MxL601 is a highly integrated low-power silicon tuner IC targeting all global analog and
digital cable standards as well as digital terrestrial reception standards. Broadband input
filtering and channel filtering have been completely integrated on-chip. This integration
enables a very compact design requiring a small footprint, low bill-of-materials cost, and low
power
consumption. A signal at the 753 RF input is filtered and converted to a programmable IF
output up to 44MHz. Automatic gain control, LO generation, and channel selectivity
functions are completely integrated on the chip, which simplifies boardlevel design. All
functions of the IC can be controlled via I2C interface. MxL601 is available in a 4 x 4 mm2
24-pin QFN package.
Features :
Tuning range from 44MHz to 1002MHz
Programmable channel bandwidths of 6, 7,and 8MHz
Integrated channel filtering requiring noexternal SAW filter for digital applications
Low power consumption with 3.3V and1.8V dual-supply operation351 mW (Digital
Terrestrial)
On-chip voltage regulator enables singlesupply 3.3V operation
Programmable IF frequency and IF spectrum inversion
Reference clock output available for re-use by demodulators and additional tuners in
multi-channel applications
Input power reporting
General purpose open-drain output GPO available for controlling off-chip circuitry
Integrated on-chip programmable loading capacitors for the reference crystal
I2C-compatible digital control interface
RoHS compliance
BLOCK DIAGRAM
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2. AUDIO AMPLIFIER STAGE
TAS5721 (optional)
2.1. General Description
The TAS5721 is a 15-W stereo or 2x10 W + 1x15 W2.1 device, efficient, digital audio-power
amplifier fordriving stereo bridge-tied speakers. One serial datainput allows processing of
up to two discrete audiochannels and seamless integration to most digitalaudio processors
and MPEG decoders. The deviceaccepts a wide range of input data and data rates. Afully
programmable data path routes these channelsto the internal speaker drivers.The TAS5721
is a slave-only device receiving allclocks from external sources. The TAS5721 operateswith
a PWM carrier between a 384-kHz switching rateand a 352-KHz switching rate, depending
on the inputsample rate. Oversampling combined with a fourth- order noise shaper provides
a flat noise floorand excellent dynamic range from 20 Hz to 20 kHz.
2.2. Features
• Audio Input/Output
– 15Wx2 into 8
– Supports Single Device 0.1, 2.0, 2.1 Modes
– Wide PVDD Range, From 4.5 V to 26 V Performance
– Efficient Class-D Operation Eliminates Need for Heatsinks
– Requires Only 3.3 V and PVDD
– One Serial Audio Input (Two Audio Channels)
– I2C Address Selection via PIN (Chip Select)
– Supports 8-kHz to 48-kHz Sample Rate (LJ/RJ/I2S)
– External Headphone-Amplifier Shutdown Signal
– Independent Channel Volume Controls With The 24-dB to Mute
– Separate Dynamic Range Control for Satellite and Sub Channels
– 21 Programmable Biquads for Speaker EQ
– Programmable Coefficients for DRC Filters
– DC Blocking Filters
– Support for 3D Effects
• General Features
– Serial Control Interface Operational Without MCLK
– Factory-Trimmed Internal Oscillator for Automatic Rate Detection
– Surface Mount, 48-Pin, 7-mm × 7-mm HTQFP Package
– Thermal and Short-Circuit Protection
1
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2.3.AbsoluteRatings
2.3.1 ELECTRICAL CHARACTERISTICS
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2.3.2 OPERATING SPECIFICATIONS
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2.4. Pinning
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TS4962M (optional 2,5W)
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3. POWER STAGE
The DC voltages required at various parts of the chassis and panel are provided by a main
power supply unit. MB82S chassis can operate with PW05, IPS60, IPS70, IPS16, IPS17,
IPS19, PW25, PW26, PW82-3, PW03, PW04, PW06, PW07 as main power supply and
also with 12V adaptor.
Which power board can be used for board to board or cable connection?
The power supplies generate 24V, 12V, 5V, 3,3V and 12V, 5V, 3.3V stand by mode DC
voltages. Power stage which is on-chassis generates 5V, 3V3 stand by voltage and 12V,
8V, 5V, 3V3, 2.5V, 1,8V and 1,2V supplies for other different parts of the chassis. Chassis
block diagram is indicated below.
The blocks on power block diagram is using dependent to main supply. For PW26 and
PW27 just common blocks are enough for proper operation.
Short CCT Protection Circuit
Short circuit protection is necessary for protecting chassis and main IC against damages
when any Vcc supply shorts to ground. Protect pin should be logic high while normal
operation. When there is a short circuit protect pin shold be logic low. After any short
detection, SW forces LEDs on LED card to blink.
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3.1. Power Management
IPS
or
12V_ VC 12V_VCC
PW
or
ADAPTER
1V2_MT5820
MOSFET
SW1
STP1
TPS54329E
5V_STBY
3V_STBY
STP2
TPS54528
BJT
BC848B
COMMON
5V_VCC
MOSFET
SW2
3.3V_VCC
TLV62065
COMMON
1.2V_AVCC
LD03
APL5910
1.5V_VCC
OR
TLV62065
COMMON
3.3V_AVCC
LD01
LM117
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4. MICROCONTROLLER – MediaTek
4.1. Description
MT5820 (Main IC) (U1)
The MediaTek MT5820 family consists of a backend decoder and a TV controller and
offers high integration for advanced applications. It combines a transport de-multiplexer, a
high definition video decoder, an audio decoder, a dual-link LVDS transmitter, a mini-LVDS
transmitter, an EPI transmitter and an NTSC/PAL/SECAM TV decoder with a 3D comb filter
(NTSC/PAL). The MT5820 enables consumer electronics manufactures to build high
quality, low cost and feature-rich DTV.
World-Leading Audio/Video Technology: The MT5820 supports Full-HD
MPEG1/2/4/h.264/DiviX/VC1/RM/AVS/VP6/VP8 (option) video decoder standards, and
JPEG. The MT5820 also supports MediaTek MDDiTM de-interlace solution can reach very
smooth picture quality for motions. A 3D comb filter added to the TV decoder recovers great
details for still pictures. The special color processing technology provides natural, deep
colors and true studio quality video. Also, the MT5820 family has built-in high resolution and
high-quality audio codec.
Rich Features for High Value Products: The MT5820 family enables true single-chip
experience. It integrates high-quality HDMI1.4a, high speed VGA ADC, LVDS, mini-LVDS,
EPI, USB2.0 receiver, TCON (option), panel overdrive (option).
WW Common Platform Capability: Reserved transport stream input is for external
demodulator for other countries or areas. TV maker can easily port the same UI to
worldwide TV models. Excellent adjacent and co-channel rejection capability grants
customers never miss any wonderful stream. Professional error-concealment provides
stable, smooth and mosaic-free video quality.
Key Features:
1. Worldwide multi-standard analog TV demodulator
2. Powerful CPU core
3. A transport de-multiplexer
4. A muti-standard video decoder
5. Rich format audio codec
6. HDMI1.4a receiver
7. Local dimming (LED backlight) (option)
8. TCON (option)
9. Panel overdrive control (option)
10. LVDS, mini-LVDS, EPI
Note: All packages are lead free
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General Features:
Host CPU
ARM11 single core 700MHz
Floating Point Unit
16K I-Cache and 16K D-Cache for ARM11 core
128K L2 Cache
Boot ROM
Boot from serial flash, NAND flash
Supports security boot
JTAG ICE interface
Watch Dog timers
Transport Demultiplexer
New generation 2 demux design for transport stream (TS) process
Supports 1 serial TS input
Supports DVB-T/T2, DVB-C, DVB-S/S2, ARIB and DTMB TS input data rate and format
Supports multi standard hardware engines for TS encryption or decryption
Up to12 even/odd keys for playback decryption use; 4 even/odd keys for playback for
record encryption
Supports 80 PID filters for playback use and another 64 PID filters for record use
Supports 80 section filters with bit-wise positive / negative mask
Supports hardware CRC-32 check
Supports PCR recovery function without VCXO
Supports a micro-processor for stream processing and video start code detection
General Copy Protection Unit
Supports CPPM/CPRM
Supports AES with 128/192/256 bit key
Supports AACS
Supports DES/3DES
Supports SHA-1/224/256
Supports MD5
Supports CSS
Supports RC4
Random number generator
Supports multiple color modes
Point, horizontal/vertical line primitive drawings
Rectangle fill and gradient fill functions
Bitblt with transparent options
Alpha blending and optional pre-multiplied alpha composition Bitblt
Stretch Bitblt
YCbCr to RGB color space conversion
Supports index to direct mode bitblt
Image Resizer
Supports 16bpp/32bpp direct color format
Supports 420/422 video format
Supports 420/422/444 JPEG format
Arbitrary ratio vertical/horizontal scaling of video, from 1/128X to 128X
Simple DMA
Supports MMU in OSD mode
OSD Plane
Three linking list OSDs with multiple color mode and all of them have up-scaler
Supports stereo OSD
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Video Plane
Supports video freeze and over scan
Flesh tone management
Gamma correction
Color Transient Improvement (CTI)
2D Peaking
Saturation/hue adjustment
Brightness and contrast adjustment
Black and White level extender
Adaptive Luma management
Automatic detect video, film and mixed-mode source
3:2/2:2 pull down source detection
Supports FHD motion-adaptive de-interlace
Supports excellent low angle image processing
Brilliant boundary shaping for moving object
Advanced non-linear panorama scaling
Programmable zoom viewer
Progressive scan output
Supports alpha blending for OSD on video plane
Dithering processing for flat panel display
Frame rate conversion
Supports FHD panel and VGA dot-to-dot
Supports PIP/POP, (dual de-interlace, one HD and one SD)
OD (option)
Supports 60Hz Full-HD and WXGA panel over drive
TCON (option)
Flexible timing control with programmable timing
Horizontal timing control
Vertical timing control
Multi-line timing control
Multi-frame timing control
Supports gate power modulation timing
Supports command-based timing
Supports POL inversion every 30 seconds
Supports 1/2/4/8 frame inversion, 1-line inversion, 2-line inversion, and could up to 255line dot inversion
Local Dimming
Block division: up to 800 total blocks, up to 100 horizontal blocks
Supports 50K ~ 50M SPI clock rate
Supports 512Mb or 1Gb or 2Gb DDR2 and DDR3 DRAM device
Supports DDR2-1066/DDR3-1333/DDR3-1600 device
Audio DSP
Supports AC-3 (Dolby Digital) decoding and E-AC3 (Dolby Digital Plus) decoding (option)
MPEG-1 layer I/II decoding
Supports WMA / HE-AAC (option)
Support Dolby DDCO, and MS10 (option)
Dolby Prologic II (option)
Audio output: 5.1ch + 2ch (down mix) + 2ch(bypass)
Pink noise and white noise generator
Equalizer
Bass management
3D surround processing with virtual surround
Audio and video lip synchronization
Supports bass/treble
Automatic volume control
Supports 5-bit (10-channel) main audio I2S output interface, each of these channels is up
to 24-bit resolution
S/PDIF interface
Supports SPDIF in bypass
SPDIF out
Analog TV IF Demodulator
Supports world-wide analog TV standard
Accept direct IF and low IF
Full digital AGC control and carrier recovery
Embedded SAW filter and IF Amplifier. Cost effective TV front-end structure and no more
cost on:
External analog SAW filters (Video/Audio)
External analog IF demodulator
External peripheral circuit on CVBS signal data path
External SAW filter and IF VGA on tuner
Peripherals
Three built-in UARTs with Tx and Rx FIFO
Ten basic serial interfaces: one is for the tuner, four are the masters for general purpose
and two of them can be
active in standby mode, one is the slave for VGA DDC, the other four extra slave serial
interfaces used for HDMI
EDID data
Five PWMs, two of them can be active in standby mode
IR receiver
Real-time clock and watchdog controller
Built-in 2-link USB2.0/1.1, both of them support external hub with 16 endpoints.
Built-in uP for standby mode
Supports SDIO interface
Supports smart card interface
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Supports two serial flash or one serial and one NAND flash
Supports 4-input low-speed ADC
Supports boundary scan (JTAG)
IC Outline
LQFP Package 256 pins with E-pad
3.3V/1.2V and 1.8V for DDR2 or 1.5V for DDR3
4.2. MediaTek Block Diagram
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4.3.CrystalSpecification
5. USB INTERFACE
Main Concept IC has integrated 2 USB 2.0 interface. One of them is used for ethernet
function, the other one is used for USB connectivity for last user. Last user can play video,
picture and audio files. Also digital channels can be record to externall storage device by
this interface. All SW files can be updated with interface.
USB circuit has 3 main parts
Integrated USB 2.0 Host interface of D3K
Protection IC
Over Curent Protection IC
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6. DDR3 SDRAM 1Gb G-die
6.1 Description:
The 1Gb DDR3 SDRAM G-die is organized as a 8Mbit x 16 I/Os x 8banks device. This
synchronous device achieves high speed double-data-rate transfer rates of up to
2133Mb/sec/pin(DDR3-2133)for general applications. The chip is designed to comply with
the following key DDR3 SDRAM features such as posted CAS, Programmable CWL,
Internal (Self) Calibration, On Die Termination using ODT pin and Asynchronous Reset . All
of the control and address inputs are synchronized with a pair of externally supplied
differential clocks. Inputs are latched at the crosspoint of differential clocks (CK rising and
CK falling). All I/Os are synchronized with a pair of bidirectional strobes (DQS and DQS) in
a source synchronous fashion. The address bus is used to convey row, column, and bank
address information in a RAS/CAS multiplexing style. The DDR3 device operates with a
single 1.5V ± 0.075V power supply and 1.5V ± 0.075V VDDQ. The 1Gb DDR3 G-die device
is available in 96ball FBGA(x16).
6.2 Features
• JEDEC standard 1.5V ± 0.075V Power Supply
• VDDQ = 1.5V ± 0.075V
• 533MHz fCK for 1066Mb/sec/pin, 667MHz fCK for 1333Mb/sec/pin,
800MHz fCK for 1600Mb/sec/pin, 933 MHz fCK for 1866Mb/sec/pin,
1066 MHz fCK for 2133Mb/sec/pin
This switch is used to open and close panel supply of TCON. It is controlled by port of main
ucontroller. Also with this circit panel sequency could be adjusted correctly. 3 panel supplys
are connected to this circuit. All of them are optional according to panels.
8. SPI FLASH MEMORY
8.1 EN25Q64 64 Megabit Serial Flash Memory with 4Kbyte Uniform
Sector
8.1.1 General Description
The EN25Q64 is a 64 Megabit (8192K-byte) Serial Flash memory, with advanced write
protection mechanisms. The EN25Q64 supports the standard Serial Peripheral Interface
(SPI), and a high performance Dual output as well as Quad I/O using SPI pins: Serial
Clock, Chip Select, Serial DQ0(DI), DQ1(DO), DQ2(WP#) and DQ3(NC). SPI clock
frequencies of up to 50MHz are supported allowing equivalent clock rates of 100MHz for
Dual Output and 200MHz for Quad Output when using the Dual/Quad Output Fast Read
instructions. The memory can be programmed 1 to 256 bytes at a time, using the Page
Program instruction. The EN25Q64 is designed to allow either single Sector/Block at a time
or full chip erase operation. The EN25Q64 can be configured to protect part of the memory
as the software protected mode. The device can sustain a minimum of 100K program/erase
cycles on each sector or block.
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8.1.2 Features
8.1.3 Block Diagram
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8.1.4 Pinning
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8.2 EN25QH16 16 Megabit Serial Flash Memory with 4Kbyte Uniform
Sector
8.2.1 General Description
The EN25QH16 is a 16 Megabit (2,048 K-byte) Serial Flash memory, with enhanced write
protection mechanisms. The EN25QH16 supports the standard Serial Peripheral Interface
(SPI), and a high performance Dual/Quad output as well as Dual/Quad I/O using SPI pins:
Serial Clock, Chip Select, Serial DQ0(DI), DQ1(DO), DQ2(WP#) and DQ3(HOLD#). SPI
clock frequencies of up to 80MHz are supported allowing equivalent clock rates of 160MHz
(80MHz x 2) for Dual Output and 320MHz (80MHz x 4) for Quad Output when using the
Dual/Quad I/O Fast Read instructions. The memory can be programmed 1 to 256 bytes at a
time, using the Page Program instruction. The EN25QH16 is designed to allow either single
Sector/Block at a time or full chip erase operation. The EN25QH16 can be configured to
protect part of the memory as the software protected mode. The device can sustain a
minimum of 100K program/erase cycles on each sector or block.
8.2.2 Features
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8.2.3 Block Diagram
8.2.4 Pinning
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9. I-LM1117/LM 800mA Low-Dropout Linear Regulator
The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA
of load current. It has the same pin-out as National Semiconductor’s industry standard
LM317.
The LM1117 is available in an adjustable version, which can set the output voltage from
1.25V to 13.8V with only two external resistors. In addition, it is also available in five fixed
voltages, 1.8V, 2.5V, 2.85V, 3.3V, and 5V. The LM1117 offers current limiting and thermal
shutdown. Its circuit includes a zener trimmed bandgap reference to assure output voltage
accuracy to within ±1%. The LM1117 series is available in SOT-223, TO-220, and TO-252
D-PAK packages. A minimum of 10F tantalum capacitor is required at the output to
improve the transient response and stability.
Features
Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable
Versions
-- Space Saving SOT-223 Package
-- Current Limiting and Thermal Protection
-- Output Current 800mA
-- Line Regulation 0.2% (Max)
-- Load Regulation 0.4% (Max)
-- Temperature Range
— LM1117 0°C to 125°C
— LM1117I 40°C to 125°C
Applications
n 2.85V Model for SCSI-2 Active Termination
n Post Regulator for Switching DC/DC Converter
n High Efficiency Linear Regulators
n Battery Charger
n Battery Powered Instrumentation
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10. CONNECTORS
10.1. HDMI (CN707,CN708)
10.2. USB(CN37, CN38)
PinNameCable color
VBUSRed
1
2 D-
D+Green
3
White (gold*) Data
4 GNDBlack
Description
5 V
Data+
Ground
(blue*)
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10.3. VGA (CN711)
10.4. SCART (SC1)
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11. SERVICE MENU SETTINGS
In order to reach service menu, First Press “MENU” Then press the remote control code
two times, which is “4725”.
In first screen following items can be seen (MB8x is same as MB6x service menu):
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11.1. Video Settings
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11.2. Audio Settings
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11.3. Options
Options-1
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Options-2
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11.4. Tuning Settings
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11.5. Source Settings
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11.6. Diagnostic
11.7 USB Operations
USB operations option can not be used directly. It can be used for updating panel tool, hw
congiguration etc.
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12. SOFTWARE UPDATE
In MB82 project there is only one software. From following steps software update procedure
can be seen:
1. MB82.bin directly inside of a flash memory(not in a folder).
2. Put flash memory to the tv when tv is powered off.
3. Power on the and pree OK button on the remote control when the tv is opened.
4. If First Time Installition screen comes, it means software update procedure is succesful.
13. TROUBLESHOOTING
13.1.NoBacklightProblem
Problem
Possible couses
Backlight pin should be high in open position. If it is low, please check Q30 and panel
cables.
: If TV is working, led is normal and there is no picture and backlight on the panel.
Dimming pin should be high or square wave in open position. If it is low, please check S16
for Mstar side and panel or power cables, connectors.
Backlight power supply should be in panel specs. Please check CN4 for MB82, related
connectors for power supply cards.
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STBY_ON/OFF should be low for standby on condition, please check R2090.
13.2CIModuleProblem
Problem: CI is not working when CI module inserted.
Possible couses: Supply, suply control pin, detect pins, mechanical positions of pins
CI supply shoul be 5V when CI module inserted. If it is not 5V please check
CI_POWER_CTRL, this pin should be low.
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Please check mechanical positions of CI module.
Detect ports should be low. If it is not low please check CI connector pins, CI module pins
and 3V3_VCC on MB82.
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13.3 Led Blinking Problem
Problem: LED blinking, no other operation
This problem indicates a short on Vcc voltages. Protect pin should be logic high while
normal operation. When there is a short circuit protect pin will be logic low. If you detect
logic low on protect pin, unplug the TV set and control voltage points with a multimeter to
find the shorted voltage to ground.
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13.4 IR Problem
Problem: LED or IR not working
Check LED card supply on MB82 chasis.
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13.5 Keypad Touchpad Problems
Problem: Keypad or Touchpad is not working
Check keypad supply and KEYBOARD pin on MB82
13.6 USB Problems
Problem: USB is not working or no USB Detection.
Check USB Supply, It should be nearly 5V.
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13.7 No Sound Problem
Problem: No audio at main TV speaker outputs.
Check supply voltages of VDD_AUDIO, 5V_VCC or 12V_VCC with a voltage-meter.
There may be a problem in headphone connector or headphone detect circuit (when
headphone is connected, speakers are automatically muted). Measure voltage at
HP_DETECT pin, it should be 3.3v.
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13.8 No Sound Problem at Headphone
Problem: No audio at headphone output.
Check HP detect pin, when headphone is. Check 5V_VCC and 3V3_VCC with a voltagemeter.
13.9 Standby On/Off Problem
Problem:
Device cannot boot, TV hangs in standby mode.
There may be a problem about power supply. Check 12V_VCC, 5V_VCC and 3V3_VCC
with a voltage-meter. Also there may be a problem about SW. Try to update TV with latest
SW. Additionally it is goood to check SW printouts via hyper-terminal (or Teraterm). These
printouts may give a clue about the problem.
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13.10 No Signal Problem
Problem: No signal in TV mode.
Check tuner supply voltage; 3V3_TUN. Check tuner options are correctly set in Service
menu. Check AGC voltage at IF_AGC pin of tuner.