Hitachi 32HB6T41U, 32284DLBN Schematic

HITACHI 32HB6T41U 32284DLBN

MB97

SERVICE MANUAL

TABLE OF CONTENTS

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

2. T/T2/C/A Tuner (U74) ................................................................................................................................................... 3

3. S/S2 TUNER & DEMODULATOR (U90) OPTIONAL ............................................................................................... 4

4. AUDIO AMPLIFIER STAGES ..................................................................................................................................... 7

A. MAIN AMPLIFIER (U62)(6-8-10 W option) ...................................................................................... ........................ 7

B. MAIN AMPLIFIER (U91)(2.5 W option) ................................................................................................................... 9

C. HEADPHONE AMPLIFIER (U85) ............................................................................................................................. 11

5. POWER STAGE .......................................................................................................................................................... 13

6. MICROCONTROLLER ............................................................................................................................................... 25

A. MSTAR MSD88RKM2 (U95) .................................................................................................................................. 25

7. 2Gb DDR3 SDRAM ..................................................................................................................................................... 30

A. Hynix H5TQ2G63FFR-PBC (U72) ........................................................................................................................... 30

8. 2Gbit (256M x 8 bit) NAND Flash Memory ................................................................................................................ 32

A. MT29F2G08ABAEAWP (U80) ................................................................................................................................ 32

9. 16M-BIT [16M x 1] CMOS SERIAL FLASH EEPROM ............................................................................................ 34

A. KH25L1606EM2-12G Macronix SPI Flash (U81) .................................................................................................... 34

10. USB Interface ............................................................................................................................................................... 35

A. CY7C65642 (U73) .................................................................................................................................................. 36

11. CI Interface ................................................................................................................................................................... 38

12. Software Update ........................................................................................................................................................... 38

A. Main SW update ................................................................................................................................................... 38

13. Troubleshooting ............................................................................................................................................................ 39

A. No Backlight Problem ........................................................................................................................................... 39

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

C. Staying in Stand-by Mode ..................................................................................................................................... 41

D. IR Problem ............................................................................................................................................................ 42

E. Keypad Touchpad Problems ................................................................................................................................. 42

F. USB Problems ........................................................................................................................................................ 43

G. No Sound Problem ................................................................................................................................................ 43

..................................... 40

H. Standby On/Off Problem ...................................................................................................................................... 44

İ. No Signal Problem ........................................................................................................... ...................................... 44

14. Service Menu Settings .................................................................................................................................................. 47

15. PLACEMENT OF BLOCKS ........................................................................................................................................ 52

16. General Block Diagram ................................................................................................................................................ 53

WARNING: It is necessary to remove the internal lead connector before removing the back cover of the TV completely!

1. INTRODUCTION

17MB97 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 include:

 Combo Front-End Demodulator  A multi standart A/V format decoder  The MACEpro video processor  Home theatre sound processor  Rich internet connectivity and completed digital home network solution  Dual-stream decoder for 3D contents  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 SCART socket(Common)  1 PC input(Common)  3 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(Common)  1 DVD(Optional)

2. T/T2/C/A TUNER (U74)

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

 Input power reporting  Open-drain General Purpose Output GPO available for controlling off-chip circuitry  I

applications

C compatible digital control interface

 RoHS compliance

Figure: Pin description

Table: Pin functions

3. S/S2 TUNER & DEMODULATOR (U90) OPTIONAL

Description

The M88RS6000 is highly single-Chip DVB-S2/S receiver. The device is consisting of tuner, a demodulator

and an LNB controller. It is fully compliant with the DVB-S2 and DVB-S standards by supporting

QPSK,(PSK,16APSK and 32APSK demodulator schemes.

The tuner is the device an RF signal in the frequency range from 950 Mhz to 2150 Mhz and down-convert the

signal directly to analog baseband signal, which will be converted to a digital signal in the advanced ADC.

After the ADC, the digital signal will be demodulated in the demodulator, related errors generated during

transmission will be corrected at this stage and finally an MPEG transport stream will be delivered in serial,

parallel or DVB-CI format.

Figure: Pin description

FEATURES

4. AUDIO AMPLIFIER ST AGES

A. MAIN AMPLIFIER (U62)(6-8-10 W option)

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 I  PSNR & DR(A-weighting) Loudspeaker: 97dB (PSNR), 105dB (DR) @ 24V  Multiple sampling frequencies (Fs)

o 32kHz / 44.1kHz / 48kHz and

S, Left-alignment and Right-alignment data format

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 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: Pin description

Figure: Functional Block Diagram

Table: Absolute Maximum Ratings

Table: Recommended Operating Conditions

B. MAIN AMPLIFIER (U91)(2.5 W option)

Description

The AD52010 is a 3.0W stereo, filter-less class-D audio amplifier. Operating with 5.0V loudspeaker driver

supply, it can deliver 3.0W output power into 4 ohm loudspeaker within 10% THD+N or 2.6W at 1% THD+N.

The AD52010 is a stereo audio amplifier with high efficiency and suitable for the notebook computer, and

portable multimedia device.

Features

 Supply voltage range: 2.5 V to 5.5 V  Support single-ended or differential analog input  Low Quiescent Current  Low Output Noise  Low shut-down current  Short power-on transient time  Internal pull-low resistor on shut-down pins  Short-circuit protection  Over-temperature protection  Loudspeaker power within 10% THD+N

o 1.78W/ch into 8 ohm loudspeaker

o >3W/ch into 4 ohm loudspeaker

 Loudspeaker efficiency

o 93% @ 8 ohm, THD+N=10% o 85% @ 4 ohm, THD+N=10%

 E-TSSOP-14L package  Integrated Feedback Resistor of 300kW

Figure: Pin description

Table:Pin functions

Table: Recommended operating conditions

C. HEADPHONE AMPLIFIER (U85)

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

Figure: Pin description

Table: Pin functions

Table: Recommended operating conditions

5. POWER STAGE

Power socket is used for taking voltages which are 12V_stby and 24V (VDD_Audio for 10W option). 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: Power socket and power options

List of the components are:

 SW1(Q56) → DMG6402LDM  SW2(Q44) → FDC642P

 STP1(U63) → RT7278G(12V panel option)  STP1(U63) → TPS54528(5V panel option)  STP2(U88) → MP2315  STP3(U70) → RT7257  STP4(U96) → RT7237  LDO1(U94) → LM1117  LDO3(U89) → APL5910  LDO4(U65) → APL5910

FDC642P

Description and Features

DMG6402LDM

Features

 Low RDS(ON)  Low Input Capacitance  Fast Switching Speed

Figure: Pin description

 Low Input/Output Leakage  Lead Free By Design/RoHS Compliant (Note 1)  Qualified to AEC-Q101 Standards for High Reliability

Figure: Pin description

TPS54528

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

Figure: Pin description

Table: Pin functions

RT7278

Description

The RT7278 is a synchronous step down converter with Advanced Constant On-Time (ACOTTM) mode

control. The ACOTTM provides a very fast transient response with few external components. The low

impedance internal MOSFET supports high efficiency operation with wide input voltage range from 4.5V to

17V. The proprietary circuit of the RT7278 enables to support all ceramic capacitors. The output voltage can be

adjustable between 0.8V and 8V. The soft-start is adjustable by an external capacitor.

Features

 ACOT

Mode Enables Fast Transient Response

 4.5V to 17V Input Voltage Range  3A Output Current  60mΩ Internal Low Site N-MOSFET

 Advanced Constant On-Time Control  Support All Ceramic Capacitors  Up to 95% Efficiency  700kHz Switching Frequency  Adjustable Output Voltage from 0.8V to 8V  Adjustable Soft-Start  Cycle-by-Cycle Current Limit  Input Under Voltage Lockout  Thermal Shutdown Protection  RoHS Compliant and Halogen Free

Figure: Pin description

Table: Pin functions

MP2315

Description

The MP2315 is a high frequency synchronous rectified step-down switch mode converter with built in internal

power MOSFETs. It offers a very compact solution to achieve 3A continuous output current over a wide input

supply range with excellent load and line regulation. The MP2315 has synchronous mode operation for higher

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

loop stabilization. Full protection features include OCP and thermal shut down. The MP2315 requires a

minimum number of readily available standard external components and is available in a space saving 8-pin

TSOT23 package.

Features

 Wide 4.5V to 24V Operating Input Range  3A Load Current  90mΩ/40mΩ Low Rds(on) Internal Power MOSFETs  Low Quiescent Current  High Efficiency Synchronous Mode Operation  Fixed 500kHz Switching Frequency  Frequency Sync from 200kHz to 2MHz External Clock  AAM Power Save Mode  Internal Soft Start  OCP Protection and Hiccup  Thermal Shutdown  Output Adjustable from 0.8V  Available in an 8-pin TSOT-23 package

Figure: Pin description

Table: Pin functions

RT7257

Description

The RT7257G is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to

3A output current from a 4.5V to 18V input supply. The RT7257G's current mode architecture and external

compensation allow the transient response to be optimized over a wide input voltage range and loads. Cycle-by-

cycle current limit provides protection against shorted outputs, and soft-start eliminates input current surge

during start-up. The RT7257G also provides under voltage protection and thermal shutdown protection. The

low current (<3uA) shutdown mode provides output disconnection, enabling easy power management in

battery-powered systems. The RT7257G is available in an SOP-8 (Exposed Pad) package.

Features

 ±1.5% High Accuracy Reference Voltage  4.5V to 18V Input Voltage Range  3A Output Current  Integrated N-MOSFET Switches  Current Mode Control  Fixed Frequency Operation: 800kHz  Output Adjustable from 0.8V to 12V  Up to 95% Efficiency  Programmable Soft-Start  Stable with Low ESR Ceramic Output Capacitors  Cycle-by-Cycle Current Limit

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