VESTEL MB82S User manual

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TABLE OF CONTENTS
1.INTRODUCTION ...................................................................................................................... 3
1.1.General Block Diagram .................................................................................................. 4
1.2.MB82S Placement of Blocks .......................................................................................... 5
1.TUNER(MXL601) ...................................................................................................................... 6
2.AUDIO AMPLIFIER STAGE ....................................................................................................7
TAS5721 (optional) ................................................................................................................... 7
2.1.General Description ........................................................................................................ 7
2.2.Features ........................................................................................................................... 7
2.3.Absolute Ratings ............................................................................................................. 8
2.3.1.Electrical Characteristics ............................................................................................ 8
2.3.2.Operating Specifications ........................................................................................... 10
2.4.Pinning .......................................................................................................................... 11
TS4962M (Optional 2,5W) ....................................................................................................... 14
3.POWER STAGE ....................................................................................................................... 15
3.1.Power Management ...................................................................................................... 17
4.MICROCONTROLLER – MediaTek ....................................................................................... 18
4.1.Description .................................................................................................................... 18
MT5820 (Main IC) (U1) ............................................................................................................... 18
4.2.MediaTek Block Diagram ............................................................................................. 24
4.3.Crystal Specification .....................................................................................................25 
5.USB INTERFACE .......................................................................................................................25
6.DDR3 SDRAM 1Gb G-Die ........................................................................................................ 26
Description: ................................................................................................................................... 26
Features: .................................................................................................................................... 26
7.SCALER AND LVDS SOCKETS ........................................................................................... 28
7.1.LVDS sockets Block Diagram ...................................................................................... 28
7.2.Panel Supply Switch Circuit ......................................................................................... 29
8.SPI FLASH MEMORY....................................................................................................................29
8.1EN25Q64 64 Megabit ................................................................................................ 29
8.1.1General Description ...................................................................................................... 29
8.1.2Features ......................................................................................................................... 30
8.1.3Block Diagram .............................................................................................................. 30
8.1.4Pinning .......................................................................................................................... 31
8.2EN25QH16 16 Megabit ..............................................................................................
8.2.1General Description ....................................................................................................... 
8.2.2Features ..........................................................................................................................
8.2.3Block Diagram ............................................................................................................... 
8.2.4Pinning .......................................................................................................................... 
9.I-LM1117/LM 800mA Low-Dropout Linear Regulator ........................................................ 
10.CONNECTORS .................................................................................................................... 
10.1.HDMI (CN707,CN708) ................................................................................................
10.2.USB(CN37, CN38) ....................................................................................................... 
10.3.VGA (CN711) ...............................................................................................................
10.4.SCART (SC1) ............................................................................................................... 
11.SERVICE MENU SETTINGS ............................................................................................. 38
11.1.Video Settings ............................................................................................................... 39

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11.2.Audio Settings ............................................................................................................... 40
11.3.Options .......................................................................................................................... 41
11.4.Tuning Settings ............................................................................................................. 43
11.5.Source Settings.............................................................................................................. 44
11.6.Diagnostic ..................................................................................................................... 45
11.7.USB Operations ............................................................................................................ 45
12.SOFTWARE UPDATE ........................................................................................................ 46
13.TROUBLESHOOTING ...................................................................................................... 466
13.1.No Backlight Problem ................................................................................................... 46
13.2.CI Module Problem....................................................................................................... 48
13.3.Led Blinking Problem ................................................................................................... 50
13.4.IR Problem .................................................................................................................... 51
13.5.Keypad Touchpad Problems ......................................................................................... 
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. GeneralBlockDiagram

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1.2. MB82SPlacementofBlocks

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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
–IntegratedCAP‐FreeHeadphoneAmplifier
–StereoHeadphone(Stereo2‐VRMSLineDriver)Outputs
• Audio/PWM Processing
– 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
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2.3. AbsoluteRatings
2.3.1 ELECTRICAL CHARACTERISTICS

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2.3.2 OPERATING SPECIFICATIONS