Vestel 17MB90 Schematic

Table of Contents

1. INTRODUCTION........................................................................................................................... 3

2. TUNER............................................................................................................................................ 4

3. AUDIO AMPLIFIER STAGES...................................................................................................... 8

A. MAIN AMPLIFIER ................................................................................................................... 8

B. LINE-OUT and HEAD-PHONE AMPLIFIER STAGE .......................................................... 12

C. SUBWOOFER AMPLIFIER STAGE ..................................................................................... 13

4. POWER STAGE ........................................................................................................................... 17

5. MICROCONTROLLER ............................................................................................................... 25

6. VIDEO BACK-END PROCESSOR ............................................................................................ 29

7. 1Gb DDR3 SDRAM (for Mstar) .................................................................................................. 31

8. 1Gb G-die DDR3 SDRAM (for FRC) .......................................................................................... 32

9. 2Gbit (256x8 bit) NAND Flash Memory ..................................................................................... 34

10. 16M-BIT (16Mx1) CMOS Serial Flash Eeprom .......................................................................... 10

11. USB Interface................................................................................................................................ 39

12. CI Interface.................................................................................................................................... 41

13. Demodulator Stage........................................................................................................................ 42

14. LNB supply and control IC ........................................................................................................... 47

15. Software Update............................................................................................................................ 49

16. Troubleshooting............................................................................................................................. 49

A. No Backlight Problem........................................................................................................... 49

B. CI Module Problem............................................................................................................... 52

C. Staying in Stand-by Mode..................................................................................................... 53

D. IR Problem ............................................................................................................................ 54

E. Keypad Touchpad Problems.................................................................................................. 55

F. USB Problems....................................................................................................................... 56

G. No Sound Problem ................................................................................................................ 56

H. Standby On/Off Problem....................................................................................................... 57

I. No Signal Problem ................................................................................................................ 57

17. Service Menu Settings................................................................................................................... 58

18. General Block Diagram................................................................................................................. 63

1. INTRODUCTION

17MB90-2 main board is driven by MStar SOC. This IC is a single chip iDTV solution that supports channel decoding, MPEG decoding, and media-center functionality enabled by a high performance AV CODEC and CPU. Key features includes,

 Combo Front-End Demodulator  A multi standart A/V format decoder  The MACEpro video processor  Home theatre sound processor  Internet and Variety of Connectivity Support  Dual-stream decoder for 3D contents  Mılti-purpose CPU for OS and multimedia  Peripheral and power management

Supported peripherals are:

 1 RF input VHF I, VHF III, UHF  1 Satellite input  1 Side AV (CVBS, R/L_Audio)  2 SCART socket(Common)  1 YPbPr (Common)  1 Side S-Video(Common)  1 PC input(Common)  4 HDMI input(Common)  1 Common interface(Common)  1 Optic S/PDIF output(Common)  1 Stereo audio input for PC(Common)  1 Subwoofer output(Common)  1 Headphone(Common)  2 USB(Common) and 2 Optional for Air mause and Wi-Fi dongle  1 Ethernet-RJ45 (Common)  1 External Touchpad(Common)

2. TUNER

A. SI2156 Terrestrial and Cable TV Tuner:

A.1. Description:

The Si2156 integrates a complete hybrid TV tuner supporting all worldwide terrestrial and cable TV standards. Leveraging Silicon Labs’ field proven digital low-IF architecture, the Si2156 maintains the unmatched performance and design simplicity of the Si2153 while further reducing footprint size and bill of materials cost. No external LNAs, tracking filters, wirewound inductors, or SAW filters are used.

Compared with competing silicon tuners and discrete MOPLL-based tuners, the Si2156 delivers superior picture quality and a higher number of received stations in crowded and near/far real-world reception conditions. The high linearity and low noise RF front-end delivers superior blocking performance and higher sensitivity in the presence of strong undesired channels and interference.

The Si2156 integrates the complete signal path from antenna input to IF outputs for both analog and digital transmission standards. Compared to traditional discrete MOPLL-based tuners, the Si2156 eliminates hundreds of external components including external LNAs, tracking filter varactors and inductors (unlike competing silicon tuners), and SAW filters, resulting in the simplest, lowest-cost BOM for a hybrid TV tuner.

Interfacing the Si2156 seamlessly with the Si2165 DVB-T/C demodulator creates a complete terrestrial and cable DVB-T/C receiver plus PAL/SECAM tuner.

A.2. Features:

- Worldwide hybrid TV tuner

- Analog TV: NTSC, PAL/SECAM

- Digital TV: ATSC/QAM, DVB-T/T2/C, ISDB-T/C, DTMB

- 42-1002 MHz frequency range

- Compliance to A/74, NorDig, D-Book, C-Book, ARIB, EN55020, OpenCable™

specifications

- Best-in-class real-world reception

- Exceeds discrete MOPLL-based tuners

- Highly integrated, lowest BOM

- No SAW filters or wirewound inductors required

- Integrated LNAs and complete tracking filters

- No alignment, tuning or calibration required

- Digital low-IF architecture

- Integrated channel select filters

- Flexible output interface

- ALIF to analog TV demodulator or SoC

- DLIF to digital TV demodulator or SoC

- 3.3 and 1.8 V power supplies

- Standard CMOS process technology

- 5 x 5 mm, 32-pin QFN package

- RoHS compliant

Figure: Pin description.

Table: Pin functions.

B. M88TS2022 Satellite Tuner

B.1. Features and General Description

B.1. Pin Assigment

B.3. Absolute Maximum Ratings and Recommended Operating

Conditions

3. AUDIO AMPLIFIER STAGES

A. MAIN AMPLIFIER (TAS5719)

a. General Description

The TAS5717/TAS5719 is a 10-W/15-W, efficient,digital audio-power amplifier for driving stereo bridge-tied speakers. One serial data input allows processing of up to two discrete audio channels and seamless integration to most digital audio processors and MPEG decoders. The device accepts a wide of input data and data rates. A fully programmable data path routes these channels to the internal speaker drivers.

The TAS5717/9 is a slave-only device receiving all clocks from external sources. The TAS5717/TAS5719 operates with a PWM carrier between a 384-kHz switching rate and a 352-KHz switching rate, depending on the input sample rate. Oversampling combined with a fourth-order noise shaper provides a flat noise floor and excellent dynamic range from 20 Hz to 20 kHz.

b. Features

• Audio Input/Output

– TAS5717 Supports 2×10 W and TAS5719 Supports 2×15 W Output

– Wide PVDD Range, From 4.5 V to 26 V

– 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 24-dB to Mute

– Programmable Two-Band Dynamic Range Control

– 14 Programmable Biquads for Speaker EQ

– Programmable Coefficients for DRC Filters

– DC Blocking Filters

– 0.125-dB Fine Volume Support

• 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

– AD, BD, and Ternary PWM-Mode Support

– Thermal and Short-Circuit Protection

• Benefits

– EQ: Speaker Equalization Improves Audio Performance

– DRC: Dynamic Range Compression. Can Be Used As Power Limiter. Enables

Speaker Protection, Easy Listening, Night-Mode Listening

– DirectPath Technology: Eliminates Bulky DC Blocking Capacitors

– Stereo Headphone/Stereo Line Drivers: Adjust Gain via External Resistors, Dedicated

Active Headpone Mute Pin, High Signal-to-Noise Ratio

– Two-Band DRC: Set Two Different Thresholds for Low- and High-Frequency

Content

c. Pin descriptions and functions:

Figure : Pin description.

Table: Pin functions.

Table: Recommended operating conditions.

B. HEAD-PHONE AMPLIFIER STAGE

Head-phone is a SoC (single on chip) configuration in mainboard, Design scheme is shown in figure 3.

Figure: Head-phone

C. SUBWOOFER AMPLIFIER STAGE

1. PREAMPLIFIER (DRV632)

a. Description

The DRV632 is a 2-VRMS pop-free stereo line driver designed to allow the removal of the output dc-blocking capacitors for reduced component count and cost. The device is ideal for single-supply electronics where size and cost are critical design parameters.

Designed using TI’s patented DirectPath™ technology, The DRV632 is capable of driving 2 VRMS into a 10-kΩ load with 3.3-V supply voltage. The device has differential inputs and uses external gain-setting resistors to support a gain range of ±1 V/V to ±10 V/V, and gain

can be configured individually for each channel. Line outputs have ±8-kV IEC ESD protection, requiring just a simple resistor-capacitor ESD protection circuit. The DRV632 has built-in active-mute control for pop-free audio on/off control. The DRV632 has an external undervoltage detector that mutes the output when the power supply is removed, ensuring a pop-free shutdown.

Using the DRV632 in audio products can reduce component count considerably compared to traditional methods of generating a 2-VRMS output. The DRV632 does not require a power supply greater than 3.3 V to generate its 5.6-Vpp output, nor does it require a split-rail power supply. The DRV632 integrates its own charge pump to generate a negative supply rail that provides a clean, pop-free ground-biased 2-VRMS output.

The DRV632 is available in a 14-pin TSSOP.

b. Features

• Stereo DirectPath™ Audio Line Driver

– 2 Vrms Into 10 kΩ With 3.3-V Supply

• Low THD+N < 0.01% at 2 Vrms Into 10 kΩ

• High SNR, >90 dB

• 600-Ω Output Load Compliant

• Differential Input and Single-Ended Output

• Adjustable Gain by External Gain-Setting Resistors

• Low DC Offset, <1 mV

• Ground-Referenced Outputs Eliminate DC-Blocking Capacitors

– Reduce Board Area – Reduce Component Cost – Improve THD+N Performance – No Degradation of Low-Frequency Response Due to Output Capacitors

• Short-Circuit Protection

• Click- and Pop-Reduction Circuitry

• External Undervoltage Mute

• Active Mute Control for Pop-Free Audio On/Off Control

• Space-Saving TSSOP Package

Figure: PW package.

Table: Pin functions.

Table: Recommended operating conditions.

2. SUB WOOFER MAIN AMPLIFIER (TPA3112D1)

a. Description

The TPA3112D1 is a 25-W efficient, Class-D audio power amplifier for driving a bridge tied speaker. Advanced EMI Suppression Technology enables the use of inexpensive ferrite bead filters at the outputs while meeting EMC requirements. SpeakerGuard™ speaker protection system includes an adjustable power limiter and a DC detection circuit. The adjustable power limiter allows the user to set a "virtual" voltage rail lower than the chip supply to limit the amount of current through the speaker. The DC detect circuit measures the

frequency and amplitude of the PWM signal and shuts off the output stage if the input capacitors are damaged or shorts exist on the inputs.

The TPA3112D1 can drive a mono speaker as low as 4Ω. The high efficiency of the TPA3112D1, > 90%, eliminates the need for an external heat sink when playing music.

The outputs are fully protected against shorts to GND, VCC, and output-to-output. The short-circuit protection and thermal protection includes an auto-recovery feature.

b. Features

• 25-W into an 8-Ω Load at < 0.1% THD+N From a 24V Supply

• 20-W into an 4-Ω Load at 10% THD+N From a 12-V Supply

• 94% Efficient Class-D Operation into 8-

• Wide Supply Voltage Range Allows Operation from 8 to 26 V

• Filter-Free Operation

• SpeakerGuard™ Speaker Protection Includes Adjustable Power Limiter plus DC Protection

• Flow Through Pin Out Facilitates Easy Board Layout

• Robust Pin-to-Pin Short Circuit Protection and Thermal Protection with Auto-Recovery Option

• Excellent THD+N/ Pop Free Performance

• Four Selectable, Fixed Gain Settings

• Differential Inputs

Ω Load Eliminates Need for Heat Sinks

Applications:

• Televisions

• Consumer Audio Equipment

Table: Recommended operating conditions.

Figure: PWP (TSSOP) Package

Table: Pin Functions.

4. POWER STAGE

Figure: Power socket and options.

Power socket is used for taking voltages which are 3.3V, 12V, 5V and 24V(VDD_Audio). These voltages are produced in power card. Also socket is used for giving dimming, backlight and standbye signals with power card. İt is shown in figure 7.

Figure: General illustration of voltage stages on main board.

24V(VDD_Audio) goes directly to the audio side, through power socket other incoming voltages from power card are converted several voltages, shown in figure 8.

List of the components are:

 SW1 and SW2 → FDC642P  DC/DC3, DC/DC1 and DC/DC4 → TPS65251  DC/DC2 → MP1484  LDO1 → APL5910  LDO2 → LM1117

FDC642P

General Description and Features

TPS65251

a) General Description

The TPS65251 features three synchronous wide input range high efficiency buck converters. The converters are designed to simplify its application while giving the designer the option to optimize their usage according to the target application.

The converters can operate in 5-, 9-, 12- or 15-V systems and have integrated power transistors. The output voltage can be set externally using a resistor divider to any value between 0.8 V and close to the input supply. Each converter features enable pin that allows a delayed start-up for sequencing purposes, soft start pin that allows adjustable soft-start time by choosing the soft-start capacitor, and a current limit (RLIMx) pin that enables designer to adjust current limit by selecting an external resistor and optimize the choice of inductor. The current mode control allows a simple RC compensation.

The switching frequency of the converters can either be set with an external resistor connected to ROSC pin or can be synchronized to an external clock connected to SYNC pin if needed. The switching regulators are designed to operate from 300 kHz to 2.2 MHz. 180° out of phase operation between Buck 1 and Buck 2, 3 (Buck 2 and 3 run in phase) minimizes the input filter requirements.

TPS65251 features a supervisor circuit that monitors each converter output. The PGOOD pin is asserted once sequencing is done, all PG signals are reported and a selectable end of reset time lapses. The polarity of the PGOOD signal is active high.

TPS65251 also features a light load pulse skipping mode (PSM) by allowing the LOW_P pin tied to V3V. The PSM mode allows for a reduction on the input power supplied to the system when the host processor is in stand-by (low activity) mode.

b) Features

• Wide Input Supply Voltage Range (4.5 V - 18 V)

• 0.8 V, 1% Accuracy Reference

• Continuous Loading: 3 A (Buck 1), 2 A (Buck 2 and 3)

• Maximum Current: 3.5 A (Buck 1), 2.5 A (Buck 2 and 3)

• Adjustable Switching Frequency 300 kHz - 2.2 MHz Set By External Resistor

• Dedicated Enable for Each Buck

• External Synchronization Pin for Oscillator

• External Enable/Sequencing and Soft Start Pins

• Adjustable Current Limit Set By External Resistor

• Soft Start Pins

• Current-Mode Control With Simple Compensation Circuit

• Power Good

• Optional Low Power Mode Operation for Light Loads

• QFN Package, 40-Pin 6 mm x 6 mm RHA

APPLICATIONS

• Set Top Boxes

• Blu-ray DVD

• Security Camera

• Car Audio/Video

• DTV

• DVR

Table: Recommended operating conditions

Figure: Pin Description

Table: Pin functions.

MP1484

a) General Description

The MP1484 is a monolithic synchronous buck regulator. The device integrates top and bottom input voltage of 4.75V to 18V. Current mode control provides fast transient response and cycle-by-cycle current limit.

supply The MP1484 is PIN compatible to the MP1482 2A/18V/Synchronous Step-Down Converter.

• 3A Continuous Output Current

• Wide 4.75V to 18V Operating Input Range

• Integrated 85mΩ Power MOSFET Switches

• Output Adjustable from 0.925V to 20V

• Up to 95% Efficiency

• Programmable Soft-Start

• Stable with Low ESR Ceramic Output Capacitors

• Fixed 340KHz Frequency

• Cycle-by-Cycle Over Current Protection

• Input Under Voltage Lockout

• Thermally Enhanced 8-Pin SOIC Package

85mΩ MOSFETS that provide 3A of continuous load current over a wide operating

An adjustable soft-start prevents inrush current at turn-on and in shutdown mode, the

current drops below 1μA.

b) Features

APPLICATIONS

• FPGA, ASIC, DSP Power Supplies

• LCD TV

• Green Electronics/Appliances

• Notebook Computers

Figure: General description

Table: Pin functions.

APL5910

a) General Description

The APL5910 is a 1A ultra low dropout linear regulator. The IC needs two supply voltages, one is a control voltage (VCNTL) for the control circuitry, the other is a main supply voltage (VIN) for power conversion, to reduce power dissipation and provide extremely low dropout voltage. The APL5910 integrates many functions. A Power-On- Reset (POR) circuit monitors both supply voltages on VCNTL and VIN pins to prevent erroneous operations. The functions of thermal shutdown and current-limit protect the device against thermal and current over-loads. A POK indicates that the output voltage status with a delay time set internally. It can control other converter for power sequence. The APL5910 can be enabled by other power systems. Pulling and holding the EN voltage below 0.4V shuts off the output.

The APL5910 is available in a SOP-8P package which features small size as SOP-8 and an Exposed Pad to reduce the junction-to-case resistance to extend power range of applications.

b) Features

 Ultra Low Dropout

- 0.12V (Typical) at 1AOutput Current

 0.8V Reference Voltage  High Output Accuracy

- ±1.5%over Line, Load, and Temperature Range

 Fast Transient Response  Adjustable Output Voltage  Power-On-Reset Monitoring on Both VCNTL and VIN Pins  Internal Soft-Start  Current-Limit and ShortCurrent-Limit Protections

 Thermal Shutdown with Hysteresis  Open-Drain VOUT Voltage Indicator (POK)  Low Shutdown Quiescent Current (< 30mA )  Shutdown/Enable Control Function  Simple SOP-8P Package with Exposed Pad  Lead Free and Green Devices Available (RoHS Compliant)

APPLICATIONS

 Motherboards, VGA Cards  Notebook PCs  Add-in Cards

Figure: Pin configuration.

Table: Recommended operating conditions.

Table: Pin description.

LM1117

a) General Description

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 LLP, TO-263, SOT-223, TO-220, and TO-252 D-PAK packages. A minimum of 10µF tantalum capacitor is required at the output to improve the transient response and stability.

b) Features

 Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable Versions  Space Saving SOT-223 and LLP Packages  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

- 2.85V Model for SCSI-2 Active Termination

- Post Regulator for Switching DC/DC Converter

- High Efficiency Linear Regulators

- Battery Charger

- Battery Powered Instrumentation

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