Vestel 17MB230 Schematic

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MB230 IDTV

SERVICE MANUAL

Table of Contents

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

2. T/T2/C/A Tuner (U1) .............................................................................................................................................. 4

3. S/S2 TUNER (U142) .............................................................................................................................................. 6

4. AUDIO AMPLIFIER STAGES ............................................................................................................................. 8

A. MAIN AMPLIFIER (U9)(6-8-10 W option) ................................................................................................................... 8

B. SUBWOOFER AMPLIFIER (U8) (12 W) ...................................................................................................................... 10

C. HEADPHONE AMPLIFIER (U5) .................................................................................................................................. 13

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14. Service Menu Settings .......................................................................................................................................... 43

15. General Block Diagram ........................................................................................................................................ 47

IMPORTANT

Before removing the rear cover from the TV for servicing, make sure that no cables are fixated to the cover. Release the cables from their clamps and disconnect (if any). Failure to do so may damage the wires and/or other components of the TV.

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1. INTRODUCTION

17MB230 main board is driven by Novatek SOC. This IC is a single chip iDTV solution which compliants

with variety ATV as NTSC, PAL and SECAM, and DTV standards as ISDB-T, DVB-T/-T2/-C/-S/-S2/-S2X,

ITU-T J.83B, 8VSB, DTMB, integrates DTV and multi-media AV decoder, SIF demodulator, and support A/V

post-processing.

Key features include:

• DTMB, DVB-T,T2,DVB-C, DVB-S/S2/S2X demodulators

• A multi standart A/V format decoder

• 5th generation Advanced Scaling Up Engine

• Embedded dual 10 bit LVDS transmitter

• Dedicated dual DSP to decode compressed audio and post-processing

• 4K2K 60p HDMI input

• Mılti-purpose CPU for OS and multimedia

• Peripheral and power management

• Embedded DRAM

Supported peripherals are:

• 1 RF input VHF I, VHF III, UHF

• 1 Satellite input

• 1 Side AV (CVBS, R/L_Audio)

• 1 BAV-IN socket(Common)

• 1 PC input(Common)

• 4 HDMI input

• 1 Common interface(Common)

• 1 Optic/ Quax S/PDIF output

• 1 Headphone(Common)

• 2 USB(1x common, 1x optional) and 2x internal USB for Wifi/Bluetooth

• 1 Ethernet-RJ45

• 1 External Touchpad/ Keyboard/Magic Button

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2. T/T2/C/A TUNER (U1)

Description

The MxL661 is a highly integrated low-power silicon tuner IC that targets all global and digital cable

standards. Broadband input filtering and channel filtering have been completely integrated on-chip. This

integration enables a compact design resulting in small footprint, low Bill-Of-Material (BOM) cost, and low-

power consumption.

A signal at the 75ohm RF input is filtered and converted to a programmable IF output frequency. Automatic

Gain Control (AGC), LO generation, and channel selectivity functions are completey integrated on the chip. All

functions of the IC can be controlled using the I2C interface.

The MxL is available in a 4 mm x 4mm x 0.85mm3, 24-pin QFN package.

Features

• Tuning range from 44MHz to 1002MHz

• Programmable channel bandwidths of 6, 7, and 8MHz

• Integrated channel filtering

• Low power consumption with 3.3V and 1.8V dual-supply operation - 351 mW (digital terrestrial)

• On-chip voltage regulator enables single supply 3.3V operation

• Programmable IF frequency and IF spectrum inversion

• Programmable RF to IF delay for ATV scrambling systems that relies on the H-Sync method

• Optioanl balun-less application note for cost-sensitive applications

• Reference clock output available for re-use by demodulators and additional tuners in multi-channel

applications

• Input power reporting

• Open-drain General Purpose Output GPO available for controlling off-chip circuitry

• I2C compatible digital control interface

• RoHS compliance

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Figure 1 Pin description

Table 1 Pin functions

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3. S/S2 TUNER (U142)

Description

The AV2018 is a highly integrated silicon tuner for DVB-S2 standard. It integrates a synthesizer, crystal oscillator, LDO, loop through path, and a direct conversion receiver including LNA, RF variable gain amplifiers, Mixer, programmable channel filter, and PGA.

The low noise figure of the receiver and loop through path eliminates the need of an external LNA. The integrated crystal oscillator can provide a reference clock for demodulator. The LDO supplies all the internal blocks the only an external voltage source is required. The AV2018 requires only a small number of external components, thus enables very competitive design.

The AV2018 implements an automatic gain control mechanism that only an analog control signal from the demodulator is required to from a close-loop gain control. The mechanism will arrange the gain of the receiver blocks to achieve best performance according to the control signal voltage. The embedded automatic calibration mechanism provides precise control of channel filter bandwidth and DC offset, no additional calibration procedure is required.

Features

• Input RF Frequency: 950Mhz to 2150Mhz

• Single +3.3V power Supply

• Embedded LNA, Mixer, VCO, crystal oscillator, and LDO

• Low Noise Figure: 5 dB, typical

• Embedded DC offset Cancellation Circuit

• Programmable channel filter with bandwith from 4MHz to 40MHz

• Automatic gain control

• Embedded RF signal loop through path

• Single-ended I/Q interface

• QFN3*3mm 16pin package

Figure 2 Pin Assigment

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Table 2 Pin Description

Figure 3 Functional Block Diagram

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4. AUDIO AMPLIFIER STAGES

A. MAIN AMPLIFIER (U9)(6-8-10 W OPTION)

Table 3 Absolute Maximum Ratings

Description

AD82587D is a digital audio amplifier capable of driving a pair of 8 ohm, 20W or a single 4ohm, 40W

speaker, both which operate with play music at a 24V supply without external heat-sink or fan requirement.

Using I2C digital control interface, the user can control AD82587D’s input format selection, mute and volume control functions. AD82587D has many built-in protection circuits to safeguard AD82587D from connection errors.

Features

• 16/18/20/24-bit input with I2S, Left-alignment and Right-alignment data format

• PSNR & DR(A-weighting) Loudspeaker: 97dB (PSNR), 105dB (DR) @ 24V

• Multiple sampling frequencies (Fs)

o 32kHz / 44.1kHz / 48kHz and

o 64kHz / 88.2kHz / 96kHz and

o 128kHz/176.4kHz/192kHz

• System clock = 64x, 128x, 256x, 384x, 512x, 768x,1024x Fs

o 256x~1024x Fs for 32kHz / 44.1kHz / 48kHz

o 128x~512x Fs for 64kHz / 88.2kHz / 96kHz

o 64x~256x Fs for 128kHz /176.4kHz/192kHz

• Supply voltage

o 3.3V for digital circuit

o 10V~26V for loudspeaker driver

• Loudspeaker output power for Stereo@ 24V

o 10W x 2ch into 8_ @ 0.16% THD+N

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o 15W x 2ch into 8_ @ 0.18% THD+N

o 20W x 2ch into 8_ @ 0.24% THD+N

• Loudspeaker output power for Mono@ 24V

o 20W x 1ch into 4_ @ 0.17% THD+N

o 30W x 1ch into 4_ @ 0.2% THD+N

o 40W x 1ch into 4_ @ 0.24% THD+N

• Sounds processing including:

o Volume control (+24dB~-103dB, 0.125dB/step)

o Dynamic range control

o Power clipping

o Channel mixing

o User programmed noise gate with hysteresis window

o DC-blocking high-pass filter

• Anti-pop design

• Short circuit and over-temperature protection

• I2C control interface with selectable device address

• Internal PLL

• LV Under-voltage shutdown and HV Under-voltage

• detection

• Power saving mode

• Dynamic temperature control

Figure 4 Pin description

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Figure 5 Functional Block Diagram

Table 4 Absolute Maximum Ratings

Table 5 Recommended Operating Conditions

B. SUBWOOFER AMPLIFIER (U8) (12 W)

Description

AD82586C is a digital audio amplifier capable of driving a pair of 8 ohm, 20W operating at 24V supply

without external heat-sink or fan requirement with play music.

AD82586C has 20 bands EQ function and can operate 20W stereo or 40W mono optionally.

AD82586C can provide advanced audio processing capabilities, such as volume control, 20 bands speaker

EQ, audio mixing, 3D surround and DRC (dynamic range control). These functions are fully programmable via

a simple I2C control interface.

Robust protection circuits are provided to protect AD82586C from damage due to accidental erroneous

operating condition. AD82586C is more tolerant to noise and PVT (Process, Voltage, and Temperature)

variation than the analog Class-AB or Class-D audio amplifier counterpart implemented by analog circuit

design. AD82586C is pop free during instantaneous power switch because of its built-in, robust anti-pop circuit.

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Features

• 16/18/20/24-bits input with I2S, Left-alignment and Right-alignment data format

• PSNR & DR (A-weighting) Loudspeaker: 99dB (PSNR), 104dB (DR) @24V

• Multiple sampling frequencies (Fs)

32kHz / 44.1kHz / 48kHz and

64kHz / 88.2kHz / 96kHz and

128kHz / 176.4kHz / 192kHz

• System clock = 64x, 128x, 192x, 256x, 384x, 512x, 576x, 768x, 1024x Fs

64x~1024x Fs for 32kHz / 44.1kHz / 48kHz

64x~512x Fs for 64kHz / 88.2kHz / 96kHz

64x~256x Fs for 128kHz / 176.4kHz / 192kHz

• Supply voltage

3.3V for digital circuit

10V~26V for loudspeaker driver

• Loudspeaker output power at 24V

10W x 2CH into 8 ohm @0.17% THD+N for stereo

20W x 2CH into 8 ohm @0.26% THD+N for stereo

• Sound processing including:

20 bands parametric speaker EQ

Volume control (+24dB~-103dB, 0.125dB/step)

Dynamic Range Control (DRC)

Dual band DRC

Power clipping

3D surround sound

Channel mixing

Noise gate with hysteresis window

Bass/Treble tone control

DC-blocking high-pass filter

• Anti-pop design

• Short circuit and over-temperature protection

• I2C control interface with selectable device address

• Support hardware and software reset

• Internal PLL

• LV Under-Voltage shutdown and HV Under-Voltage detection

• Power saving mode

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Figure 6 Pin Description

Figure 7 Functional Block Diagram

Table 6 : Absolute Maximum Ratings

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Table 7 Recommended Operating Conditions

C. HEADPHONE AMPLIFIER (U5)

Description

The AD22657B is a 2-Vrms cap-less stereo line driver. The device is ideal for single supply electronics.

Cap-less design can eliminate output dc-blocking capacitors for better low frequency response and save cost.

The AD22657B is capable of delivering 2-Vrms output into a 10k ohm load with 3.3V supply. The gain

settings can be set by users from 1V/V to 10V/V externally. The AD22657B has under voltage protection to

prevent POP noise. Build-in shutdown control and de-pop control sequence also help AD22657B to be a pop-

less device.

The AD22657B is available in a 10-pin MSOP package.

Features

• Operation Voltage: 3V to 3.6V

• Cap-less Output

o Eliminates Output Capacitors

o Improves Low Frequency Response

o Reduces POP/Clicks

• Low Noise and THD

o Typical SNR 107dB

o Typical Vn 7uVrms

o Typical THD+N < 0.02%

• Maximum Output Voltage Swing into 2.5k Load

o 2Vrms at 3.3V Supply Voltage

• Single-ended Input

• External Gain Setting from 1V/V to 10V/V

• Fast Start-up Time: 0.5ms

• Integrated De-Pop Control

• External Under Voltage Protection

• Thermal Protection

• Less External Components Required

• +/-8kV IEC ESD Protection at line outputs

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Figure 8 Pin description

Table 8 Pin functions

Table 9 Recommended operating conditions

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5. POWER STAGE

Power socket is used for taking voltages which are 12V_stby and 24V (VDD_Audio for 10W option via

power_pin1). These voltages are produced in power card. Also socket is used for giving dimming, backlight

and stand-by signals with power card. It is shown in figure.

Figure 9 Power socket and power options

Figure 10 Power Distrubution

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List of the components are:

• SW1(Q61-Q2) → UPA1919TE

• SW2(Q77) → DMG6402LDM

• DC-DC1 (U63) → TPS54528

• DC-DC2(U4) → TPS54528

• DC-DC3 (U128) → MP1470HGJ

• DC-DC4 (U10) → MP8774GQ-Z

• LDO1(U143) → APL5910

A. UPA1919TE

Description and Features

B. DMG6402LDM

Features

• Low RDS(ON)

• Low Input Capacitance

• Fast Switching Speed

• Low Input/Output Leakage

• Lead Free By Design/RoHS Compliant (Note 1)

• Qualified to AEC-Q101 Standards for High Reliability

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C. TPS54528

Description

The TPS54528 is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS54528 enables

Figure 11 Pin description

system designers to complete the suite of various end-equipment power bus regulators with a cost effective, low

component count, low standby current solution. The main control loop for the TPS54528 uses the D-CAP2™

mode control that provides a fast transient response with no external compensation components. The adaptive

on-time control supports seamless transition between PWM mode at higher load conditions and Eco-mode™

operation at light loads. Eco-mode™ allows the TPS54528 to maintain high efficiency during lighter load

conditions. The TPS54528 also has a proprietary circuit that enables the device to adopt to both low equivalent

series resistance (ESR) output capacitors, such as POSCAP or SP-CAP, and ultra-low ESR ceramic capacitors.

The device operates from 4.5-V to 18-V VIN input. The output voltage can be programmed between 0.76 V

and 6.0 V. The device also features an adjustable soft start time. The TPS54528 is available in the 8-pin DDA

package, and designed to operate from –40 C to 85 C.

Features

• D-CAP2™ Mode Enables Fast Transient Response

• Low Output Ripple and Allows Ceramic Output Capacitor

• Wide VIN Input Voltage Range: 4.5 V to 18 V

• Output Voltage Range: 0.76 V to 6.0 V

• Highly Efficient Integrated FETs Optimized for Lower Duty Cycle Applications

o 65 mΩ (High Side) and 36 mΩ (Low Side)

• High Efficiency, less than 10 μA at shutdown

• High Initial Bandgap Reference Accuracy

• Adjustable Soft Start

• Pre-Biased Soft Start

• 650-kHz Switching Frequency (fSW)

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• Cycle By Cycle Over Current Limit

• Auto-Skip Eco-mode™ for High Efficiency at Light Load

Figure 12 Pin Description

Table 10 Pin Functions

D. MP1470HGJ

Description

The MP1470 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with internal

power MOSFETs. It offers a very compact solution to achieve a 2A continuous output current over a wide input

supply range, with excellent load and line regulation. The MP1470 has synchronous-mode operation for higher

efficiency over the output current-load range. Current-mode operation provides fast transient response and

eases loop stabilization. Protection features include over-current protection and thermal shutdown. The MP1470

requires a minimal number of readily-available, standard, external components and is available in a space-

saving 6-pin TSOT23 package.

Features

• Wide 4.7V-to-16V Operating Input Range

• 163mΩ/86mΩ Low-RDS(ON) Internal Power MOSFETs

• Proprietary Switching-Loss–Reduction Technique

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• High-Efficiency Synchronous-Mode Operation

• Fixed 500kHz Switching Frequency

• Internal AAM Power-Save Mode for High Efficiency at Light Load

• Internal Soft-Start

• Over-Current Protection and Hiccup

• Thermal Shutdown

• Output Adjustable from 0.8V

• Available in a 6-pin TSOT-23 package

Figure 13 Pin Description

Table 11 Pin Functions

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E. MP8774GQ-Z

Description

The MP8774 is a fully integrated high-frequency, synchronous, rectified, step-down, switch-mode converter

with internal power MOSFETs. The MP8874 offers a very compact solution that achieves 12A of continuous

output current with excellent load and line regulation over a wide input range. The MP8774 uses synchronous

mode operation for higher efficiency over the output current load range. Constant-on-time (COT) control

operation provides very fast transient response, easy loop design, and very tight output regulation. Full

protection features include short-circuit protection (SCP), over-current protection (OCP), under-voltage

protection (UVP), and thermal shutdown. The MP8774 requires a minimal number of readily available,

standard, external components and is available in a space-saving QFN-16 (3mmx3mm) package.

Features

• Output Adjustable from 0.6V

• Wide 3V to 18V Operating Input Range

• 12A Output Current

• 16mΩ/5.5mΩ Low RDS(ON) Internal Power MOSFETs

• 100μA Quiescent Current

• High-Efficiency Synchronous Mode Operation

• Pre-Biased Start-Up

• Fixed 700kHz Switching Frequency

• External Programmable Soft Start-Up Time

• Enable (EN) and Power Good (PG) for Power Sequencing

• Over-Current Protection (OCP) and Hiccup

• Thermal Shutdown

• Available in a QFN-16 (3mmx3mm) Package

Figure 14 Pin Descriptions

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Table 12 Pin Functions

F. APL5910

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.

Features

• Ultra Low Dropout

o 0.12V (Typical) at 1AOutput Current

• 0.8V Reference Voltage

• High Output Accuracy

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

• Fast Transient Response

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• 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)

Figure 15 Pin Description

Table 13 Pin Functions

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6. MICROCONTROLLER

NOVATEK NT72671TBG

Description

NT72671TBG is an integrated digital TV system-on-chip which complaints with variety ATV standards

(NTSC, PAL and SECAM), and DTV standards (ISDB-T, DVB-T/-T2/-C/-S/-S2/-S2X, ITU-TJ.83B, 8VSB,

and DTMB), and integrates DTV and multi-media AV decoder, SIF demodulator, and support A/V post-

processing. The integrated video ADC and video decoder support PC VGA port, YPbPr or SCART, CVBS and

SCART S-Video Input. The video decoder supports universal TV video format. The integrated audio ADC

supports stereo audio input corresponding to video input sources. The integrated TV sound decoder supports

universal TV sound format. The advanced picture quality and color engine create more vivid image impression

than ever. The HDMI receiver v2.0 supports deep color, CEC features and 3D input formats. The USB high

speed host supports updating firmware code, multi-media playback from the external USB flash devices.

The standby controller can operate solely from the main system, powered by the standby powersource from power module, consumes as low current as possible. It meets the requirement of Green appliance.

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