VESTEL MB300 User manual

MB300 IDTV
SERVICE MANUAL

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Table of Contents
1. INTRODUCTION ..................................................................................................................................................2
2. TUNER ...................................................................................................................................................................3
A.Digital and Analog TV Tuner: (Si2151 / U6) ...............................................................................................................3
B. Digital Satellite Tuner (AV2018 / U27)....................................................................................................................... 5
3. LNB SUPPLY AND CONTROL IC (MPS8126 / U26) ........................................................................................ 7
4. DEMODULATOR STAGE (Si2169 / U5)............................................................................................................. 9
5. AUDIO AMPLIFIER STAGES ........................................................................................................................... 13
A.MAIN AMPLIFIER (AD82587D / U13) (10W) ............................................................................................................13
B. SUBWOOFER AMPLIFIER (AD82586C / U14) (12 W)................................................................................................16
C. HEADPHONE AMPLIFIER (AD22657B / U23) ............................................................................................................ 18
D.SUBWOOFER PREAMPLIFIER (AD22657B / U22) ..................................................................................................... 20
E. SCART AUDIO AMPLIFIER (TL062 / U12) ..................................................................................................................21
6. POWER STAGE................................................................................................................................................... 23
A.NTGS3446 (Q47) ...................................................................................................................................................... 24
B. FDS4685 (Q41) ......................................................................................................................................................... 24
C. TPS54528 (U30)........................................................................................................................................................ 24
D.TPS54628 (U28)........................................................................................................................................................ 26
E. TPS54821 (U29-U35)................................................................................................................................................28
F. RT7278G (U44)......................................................................................................................................................... 30
G.APL5910 (U31-U32-U33).......................................................................................................................................... 32
H.LM1117 (U36) ..........................................................................................................................................................34
7. MICROCONTROLLER (MEDIATEK MT5827P / U1) ..................................................................................... 35
8. VIDEO BACK-END PROCESSOR (MSTAR – MST7410FE / U3) .................................................................. 47
9. 4Gb DDR3 SDRAM (K4B4G1646D / U7-U8-U9-U10-U11) ............................................................................. 50
10. 32Mb SPI FLASH (W25Q32FVSSIG / U4) ........................................................................................................ 52
11. EMMC MEMORY (MTFC16GAKAECN-2MWT / U24) .................................................................................. 55
12. USB INTERFACE................................................................................................................................................ 58
TPS2553 (U16-U17-U18-U19-U39) ..........................................................................................................................58
13. RESET IC (MAX809 / U41) ................................................................................................................................ 60
14. SOFTWARE UPDATE ........................................................................................................................................ 61
15. TROUBLESHOOTING........................................................................................................................................ 64
A.No Backlight Problem .............................................................................................................................................. 64
B. CI Module Problem ..................................................................................................................................................65
C. StayIng In Standby Mode .........................................................................................................................................66
D.IR Problem................................................................................................................................................................67

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E. Keypad Touchpad Problems ....................................................................................................................................68
F. USB Problems........................................................................................................................................................... 68
G.No Sound Problem ...................................................................................................................................................69
H.Standby On/Off Problem .........................................................................................................................................70
İ. No Signal Problem....................................................................................................................................................70
16. GENERAL BLOCK DIAGRAM ......................................................................................................................... 73
1.INTRODUCTION
17MB300 main board is driven by Mediatek SOC. This IC is a single chip Android TV with built in digital
tuner solution that supports channel decoding, MPEG decoding, and media-center functionality enabled by a
high performance AV CODEC and CPU. This IC also supports 4K2K (UHD).
Key Features:
Worldwide multi-standard analog TV demodulator
ATSC/DVB-T/DVB-C demodulators
True 120Hz Full HD MJC
Powerful CPU core
D graphic support OpenGL ES 3.0, DirectX DX11
A transport de-multiplexer
A muti-standard video decoder (including VP9)
Rich format audio codec
H.264 encoder
HDMI 1.4a/2.0 receiver with 3D support
MHL 2.0 & Standby Charging
2D/3D converter
Ethernet MAC+PHY
Local dimming (LED backlight)
TCON
Panel overdrive control
four-link LVDS, mini-LVDS, V-by-one, EPI
Supported Peripherals are:
1 RF input VHF I, VHF III, UHF
1 Satellite input
1 Side AV (CVBS, R/L_Audio)
1 SCART socket(Common)
1 YPbPr / Back S-Video(Common)
1 PC input(Common)
4 HDMI input(2xHDMI1.4 and 2xHDMI2.0) (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)
1x USB3.0 and 2xUSB2.0
1 Ethernet-RJ45

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2.TUNER
A. DIGITAL AND ANALOG TV TUNER: (SI2151 / U6)
Description
The Si2151 is Silicon Labs' sixth-generation hybrid TV tuner supporting all worldwide terrestrial and cable
TV standards. Requiring no external balun, SAW filters, wirewound inductors or LNAs, the Si2151 offers the
lowest-cost BOM for a hybrid TV tuner. Also included are an integrated power-on reset circuit and an option
for single power supply operation. As with prior-generation Silicon Labs TV tuners, the Si2151 maintains very
high linearity and low noise to deliver superior picture quality and a higher number of received stations when
compared to other silicon tuners. The Si2151 offers increased immunity to WiFi and LTE interference,
eliminating the need for external filtering. For the best performance with next-generation digital TV standards,
such as DVB-T2/C2, the Si2151 delivers industry-leading phase noise performance.
Features
Worldwide hybrid TV tuner
-Analog TV: NTSC, PAL/SECAM
-Digital TV: ATSC/QAM, DVBT2/T/C2/C, ISDB-T/C, DTMB
-1.7 MHz, 6 MHz, 7 MHz, 8 MHz, and 10 MHz channel bandwidths
-42-1002 MHz frequency range
Industry-leading margin to A/74, NorDig, DTG, ARIB, EN55020, OpenCable™, DTMB
Lowest BOM for a hybrid TV tuner
-No balun, SAW filters, or external inductors required
-Increased ESD protection on 4pins
Best-in-class real-world reception
-Lowest phase noise
-High Wi-Fi and LTE immunity
Low power consumption
-3.3 V and 1.8 V power supplies
-Integrated 1.8 V LDO for 3.3 V single supply operation
Integrated power-on reset circuit
Standard CMOS process
3x3 mm, 24-pin QFN package
RoHS compliant
Figure 1: Pin Assignment

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Table 1: Pin Description
Figure 2: Functional Block Diagram

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Table 2: Recommended Operating Conditions
B. DIGITAL SATELLITE TUNER (AV2018 / U27)
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

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Figure 3: Pin Assigment
Table 3: Pin Description
Figure 4: Functional Block Diagram

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Table4: Absolute Maximum Ratings
3.LNB SUPPLYAND CONTROL IC (MPS8126 / U26)
Description
The MP8126 is a voltage regulator designed to provide efficient, low-noise power to a satellite receiver’s RF
LNB (Low Noise Block) converter. It connects using a coaxial cable through a link that is compatible with the
European EUTELSAT specification (DiSEqC) 1.x that receives instructions from a dedicated controller.
The MP8126 integrates a current-mode boost regulator followed by a tracking linear regulator. The boost
regulator provides a clean and quiet power source that will not contaminate the lownoise RF signal as it is
down-converted to the receiver. The tracking linear regulator protects the output against overloads or shorts.
The MP8126 provides a number of features described in the DiSEqC, including voltage selection of
horizontal or vertical LNB polarization directions, and selectable VOUT compensation for substantial voltage
drops on long coaxial cable. In accordance with DiSEqC, the part can detect a 22kHz signal and output a
shaped signal.
The MP8126 is available in a thermally enhanced TSSOP16EP and 24-pin QFN (4X4mm) packages.
Features
DiSEqC 1.x Compatibility
Up to 550mA Output Current
Programmable Current Limit
8V-to-14V Input Voltage
Boost Converter with Internal Switch
Low-Noise LDO Output
Built-In 22kHz Signal Shaper
1V Line-Drop Compensator
Adjustable Soft-Start Time
POK Indicator
Figure 5: Pin Assignment
Short-Circuit Protection
Over-Temperature Protection
TSSOP16 Exposed Pad and 24-pin QFN (4X4mm) Packages

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Table 5: Pin Description
Figure 6: Functional Block Diagram
Table 6: Recommended Operating Conditions

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4.DEMODULATOR STAGE (SI2169 / U5)
Description
The Si2169 integrates DVB-T2, DVB-T, DVB-C, DVB-S and DVB-S2 digital demodulators into a single
advanced CMOS technology mixed-signal die for new generation terrestrial, cable, and satellite TV standards.
Leveraging Silicon Labs’ proven digital demodulation architecture, the Si2169 achieves excellent reception
performance for each media while significantly minimizing front-end design complexity, cost, and power
dissipation. Connecting the Si2169 to a terrestrial and cable hybrid TV tuner, such as Silicon Labs’ Si214x,
Si215x, and Si217x, results in a high performance and cost optimized TV front-end solution.
Features
Flexible tuner interface
-Accepts standard or lo IF input for DVB-T2/T/C
-ZIF for DCB-S2/S and DSS
DVB-T2 (ETSI EN 302 755)
-COFDM demodulator FEC (LDP/BCH) decoder
-NorDig Unified ver.2.2.1 and D-Book 7.0 compliant
-Supports single and multiple PLPs
-Supports SISO and MISO transmission
-Fully automatic acquisition
-Automatic L1 signaling parsing
-Short locking time
DVB-T (ETSI EN 300 744)
-COFDM demodulator and FEC decoder
-NorDig Unified 2.2.1, D-Book 7.0 compliant
-Supports all C.R.; G.I.; LP AND HP streams
DVB-C (ETSI EN 300 429/ITU J.83 Annex A/C)
-QAM demodulator end FEC decoder
-1 to 7.2 MSymbol/s
-C-Book compliant
DVB-S (ETSI EN 300 421)
-QPSK demodulator end FEC decoder
-1 to 45 MSymbol/s
DVB-S2 (ETSI EN 302 307 and TR102-376)
-QPSK/8PSK demodulator end FEC (LDPC/BCH) decoder
-Broadcast profile: CCM, 64800bit frame, single TS
-1 to 45 MSymbol/s
-Roll-off factors: 0.35 / 0.25 / 0.20
-DIRECTVTM AMC compatible
DIRECTVTM (DSS) compliant
DiSEqCTM 2.0 interface, Unicable support
DSP-base synchronization and demodulation control
-Embedded ROM/NVM-coded firmware avoids code download and allows immediate operation at
startup
-Supports firmware patch code downloads for if-field upgradeability