Hitachi 49HK6T74U, 49293DLB Schematic

HITACHI

49HK6T74U

49293DLB

MB120

SERVICE MANUAL

Table of Contents

1. INTRODUCTION .......................................................................................................................................................... 2

2. TUNER ........................................................................................................................................................................... 3

A. SI2151 Terrestrial and Cable TV Tuner: ..................................................................................................................... 3

B. M88TS2022 Satellite Tuner ........................................................................................................................................ 5

3. AUDIO AMPLIFIER STAGES ...................................................................................................................................... 6

A. MAIN AMPLIFIER (U8) (10W/12W options) ............................................................................................................... 6

B. SUBWOOFER AMPLIFIER (U9) (12 W) ........................................................................................................................ 8

C. HEADPHONE AMPLIFIER (U59) ................................................................................................................................ 10

D. SUBWOOFER PREAMPLIFIER (U30) .......................................................................................................................... 12

E. SCART AUDIO AMPLIFIER (U31) ............................................................................................................................... 12

4. POWER STAGE ........................................................................................................................................................... 12

A. TPS54528 ................................................................................................................................................................. 13

B. TPS54628 ................................................................................................................................................................. 15

C. TPS54821 ................................................................................................................................................................. 17

D. FDS4685 ................................................................................................................................................................... 19

E. NTGS3446 ................................................................................................................................................................ 20

F. APL5910 ................................................................................................................................................................... 21

G. LM1117 .................................................................................................................................................................... 23

5. MICROCONTROLLER (MSTAR MSD95M0D) ........................................................................................................ 24

6. VIDEO BACK-END PROCESSOR (MSTAR) ........................................................................................................... 31

MST7410FE ................................................................................................................................................................... 31

7. 2Gb DDR3 SDRAM ..................................................................................................................................................... 34

Hynix H5TQ2G63GFR .................................................................................................................................................... 34

8. 4Gb DDR3L SDRAM ................................................................................................................................................... 35

Hynix H5TQ4G63GFR .................................................................................................................................................... 35

9. 32GBIT (4G X 8 BIT) NAND FLASH MEMORY ..................................................................................................... 37

MT29F4G08ABAEAWP .................................................................................................................................................. 37

10.

16M-BIT [16M x 1] CMOS SERIAL FLASH EEPROM ............................................................................................ 39

A. MX25L1606E SPI Flash ............................................................................................................................................. 39

B. M25Q32FV SPI Flash ................................................................................................................................................ 41

11. DEMODULATOR STAGE .......................................................................................................................................... 43

12. LNB SUPPLY AND CONTROL IC ............................................................................................................................ 46

TPS65233 ...................................................................................................................................................................... 46

13. SOFTWARE UPDATE ................................................................................................................................................ 47

Main SW update ........................................................................................................................................................... 47

14. TROUBLESHOOTING ................................................................................................................................................ 48

A. No Backlight Problem .............................................................................................................................................. 48

B. CI Module Problem .................................................................................................................................................. 50

C. Staying in Stand-by Mode ........................................................................................................................................ 52

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

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

F. USB Problem s ............................................................................................................... ............................................ 56

G. No Sound Problem ................................................................................................................................................... 57

H. Standby On/Off Problem ......................................................................................................................................... 58

İ. No Signal Problem ........................................................................................................... ......................................... 58

15. GENERAL BLOCK DIAGRAM ................................................................................................................................. 59

1. INTRODUCTION

17MB120 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. This IC also supports 4K2K (UHD).

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  Multi-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)  1 SCART socket(Common)  1 YPbPr / Back 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)  1x USB3.0 and 2xUSB2.0(Common)  1 Ethernet-RJ45 (Common)  1 External Touchpad(Common)

2. TUNER

A. SI2151 TERRESTRİAL AND CABLE TV TUNER:

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

o Analog TV: NTSC, PAL/SECAM o 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

o No balun, SAW filters, or external inductors required o Increased ESD protection on 4pins

 Best-in-class real-world reception

o Lowest phase noise o High Wi-Fi and LTE immunity

 Low power consumption

o 3.3 V and 1.8 V power supplies o Integrated 1.8 V LDO for 3.3 V singlesupply operation

 Integrated power-on reset circuit  Standard CMOS process  3x3 mm, 24-pin QFN package  RoHS compliant

Figure 1.1 Si2151 Pin description

Table 1.1 Pin Functions

B. M88TS2022 SATELLİTE TUNER

Features and General Description

Pin Assigment

Absolute Maximum Ratings and Recommended Operating Conditions

3. AUDIO AMPLIFIER STAGES

A. MAIN AMPLIFIER (U8) (10W/12W OPTİONS)

Description

AD82587D is a digital audio amplifier capable of driving a pair of 8 ohm, 20W or a single 4 ohm, 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, DRC (dynamic range control), 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 I  PSNR & DR(A-weighting) Loudspeaker: 97dB (PSNR), 105dB (DR) @ 24V  Multiple sampling frequencies (Fs)

 32kHz / 44.1kHz / 48kHz and  64kHz / 88.2kHz / 96kHz and  128kHz/176.4kHz/192kHz

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

 256x~1024x Fs for 32kHz / 44.1kHz / 48kHz  128x~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

S, Left-alignment and Right-alignment data format

 Loudspeaker output power for Stereo@ 24V

 10W x 2ch into 8_ @ 0.16% THD+N  15W x 2ch into 8_ @ 0.18% THD+N  20W x 2ch into 8_ @ 0.24% THD+N

 Loudspeaker output power for Mono@ 24V

 20W x 1ch into 4_ @ 0.17% THD+N  30W x 1ch into 4_ @ 0.2% THD+N  40W x 1ch into 4_ @ 0.24% THD+N

 Sounds processing including:

 Volume control (+24dB~-103dB, 0.125dB/step)  Dynamic range control  Power clipping  Channel mixing  User programmed noise gate with hysteresis window

 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 3.2: Pin description

Figure 3.3: Functional Block Diagram

Table3.1: Absolute Maximum Ratings

Table3.2: Recommended Operating Conditions

B. SUBWOOFER AMPLIFIER (U9) (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.

Features

 16/18/20/24-bits input with I

S, Left-alingment and Right-alingment 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

 I

C 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

Figure 3.4: Pin description

Figure 3.5: Functional Block Diagram

Table 3.3: Absolute Maximum Ratings

Table 3.4: Recommended Operating Conditions

C. HEADPHONE AMPLIFIER (U59)

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 popless device.

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

Features

 Operation Voltage: 3V to 3.6V  Cap-less Output

 Eliminates Output Capacitors  Improves Low Frequency Response  Reduces POP/Clicks

 Low Noise and THD

 Typical SNR 107dB  Typical Vn 7uVrms  Typical THD+N < 0.02%

 Maximum Output Voltage Swing into 2.5k Load

 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

Figure 3.6: Pin description

Table 3.5: Pin functions

Table3.6: Recommended operating conditions

D. SUBWOOFER PREAMPLIFIER (U30)

AD22657B is used for subwoofer out, as well.

E. SCART AUDIO AMPLIFIER (U31)

AD22657B is used for scart audio amplifier, as well.

4. POWER STAGE

Figure 4.1: Power socket and options.

Power socket is used for taking voltages which are 12V, 5V and VDD_Audio. These voltages are produced in power board. Also socket is used for giving dimming, backlight and standby signals with power board. It is shown at figure 4.1.

Figure 4.2: General illustration of voltage stages on main board.

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:

 TPS54528  TPS54628  TPS54821  FDS4685  NTGS3446  APL5910  LM1117

A. TPS54528

General Description

The TPS54528 is an adaptive on-time D-CAP2 mode synchronous buck converter.The TPS54528 enables 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 TSP54528 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 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 V

Input Voltage Range: 4.5 V to 18 V

 Output Voltage Range: 0.76 V to 6 V  Highly Efficient Integrated FETs Optimized for Lower Duty Cycle Applications- 65 mOhm (High Side)

and 36 mOhm (Low Side)

 High Efficiency, less than 10 mikroAmper at shutdown  High Initial Bandgap Reference Accuracy  Adjustable Soft Start  Pre-Biased Soft Start  650-kHz Switching Frequency (f

)

 Cycle By Cycle Over Current Limit  Auto-Skip Eco-mode for High Efficiency at Light Load

Applications

 Wide Range of Applications for Low Voltage System  Digital TV Power Supply  High Definition Blu-ray Disc Players  Networking Home Terminal  Digital Set Top Box(STB)

Table 4.1: Recommended operating conditions

Figure 4.3: Pin Description

Table 4.2: Pin functions.

B. TPS54628

General Description

The TPS54628 is an adaptive on-time D-CAP2 mode synchronous buck converter.The TPS54628 enables 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 TPS54628 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 TSP54628 to maintain high efficiency during lighter load conditions. The TPS54628 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 7 V. The device also features an adjustable soft start time. The TPS54628 is available in the 8-pin DDA and 10-pin DRC packages, and is designed to operate over the ambient temperature range of -40C to 85C.

Features

 D-CAP2 Mode Enables Fast Transient Response  Low Output ripple and Allows Ceramic Output Capacitor  Wide V  Output Voltage Range: 0.76 V to 7 V  Highly Efficient Integrated FETs Optimized for Lower Duty Cycle Applications- 36 mOhm (High Side)

and 28 mOhm (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 (f  Cycle By Cycle Over Current Limit  Auto-Skip Eco-mode for High Efficiency at Light Load

Input Voltage Range: 4.5 V to 18 V

)

Applications

 Wide Range of Applications for Low Voltage System  Digital TV Power Supply  High Definition Blu-ray Disc Players  Networking Home Terminal  Digital Set Top Box(STB)

Table 4.3: Recommended operating conditions

Figure 4.4: Pin Description

Table 4.4: Pin functions.

C. TPS54821

General Description

The TPS54821 in thermally enhanced 3.5 mm x 3.5 mm QFN package is a full featured 17 V, 8 A synchronous step down converter which is optimized for small designs through high efficiency and integrating the high-side and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces component count, and by selecting a high switching frequency, reducing the inductor's footprint. The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and the open drain power good pins. Cycle by cycle current limiting on the high-side FET protects the device in overload situations and is enhanced by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit which turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection will be triggered if the overcurrent condition has persisted for longer than the preset time. Thermal hiccup protection disables the device when the die temperature exceeds the thermal shutdown temperature and enables the part again after the built-in thermal shutdown hiccup time.

Features

 Integrated 26 mΩ / 19 mΩ MOSFETs  Split Power Rail: 1.6 V to 17 V on PVIN

 200 kHz to 1.6 MHz Switching Frequency  Synchronizes to External Clock

 0.6V ±1% Voltage Reference Over Temperature  Low 2 μA Shutdown Quiescent Current

 Monotonic Start-Up into Pre-biased Outputs  –40°C to 125°C Operating Junction Temperature Range  Adjustable Input Undervoltage Lockout

 Adjustable Slow Start/Power Sequencing  Power Good Output Monitor for Undervoltage and Overvoltage  Adjustable Input Undervoltage Lockout

Applications

 Digital TV Power Supplies  Set Top Boxes  Blu-ray DVDs  Home Terminals

Table 4.5: Recommended operating conditions

Figure 4.5: Pin Description

Table 4.6: Pin functions.

D. FDS4685

General Description

This P-Channel MOSFET is a rugged gate version of Fairchild Semiconductor’s advanced PowerTrench process. It has been optimized for power management applications requiring a wide range of gate drive voltage ratings (4.5V – 20V).

Features

 –8.2 A, –40 V R

DS(ON)

 Fast switching speed  High performance trench technology for extremely lowRDS(ON)  High power and current handling capability

= 0.027  @ VGS = –10 V

DS(ON)

= 0.035  @ V

= –4.5 V

Figure 4.6: Pins

Table 4.7: Absolute maximum ratings

E. NTGS3446

Features

 Ultra Low R  Higher Efficiency Extending Battery Life  Logic Level Gate Drive  Diode Exhibits High Speed, Soft Recovery  Avalanche Energy Specified  IDSS Specified at Elevated Temperature  PbFree Package is Available

Applications

 Power Management in portable and batterypowered products, i.e. computers, printers, PCMCIA cards,

cellular and cordless

 Lithium Ion Battery Applications  Notebook PC

DS(on)

Figure 4.7: Pin description

Table 4.8: Maximum ratings

F. APL5910

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.

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 4.9: Recommended operating conditions.

Table 4.10: Pin description.

G. LM1117

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.

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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