TABLE OF CONTENTS |
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1. |
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INTRODUCTION...................................................................................................................... |
3 |
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1.1. |
General Block Diagram.................................................................................................. |
4 |
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1.2. |
MB8 Placement of Blocks............................................................................................ |
5 |
1. |
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TUNER(S 2156) ........................................................................................................................ |
6 |
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M88TS2022 (Optional)...................................................................................................................... |
7 |
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M88DS3002 (Optional)...................................................................................................................... |
9 |
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2. |
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AUDIO AMPLIFIER STAGE................................................................................................. |
11 |
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STA381BWS............................................................................................................................ |
11 |
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2.1. |
General Description...................................................................................................... |
11 |
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2.2. |
Features ........................................................................................................................ |
11 |
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2.3. |
Absolute Ratings .......................................................................................................... |
13 |
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2.3.1. |
Electrical Characteristics.......................................................................................... |
13 |
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2.3.2. |
Operating Specifications .......................................................................................... |
13 |
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2.4. |
Pinning ......................................................................................................................... |
14 |
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TS4962M (Optional 2,5W) ...................................................................................................... |
17 |
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3. |
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POWER STAGE...................................................................................................................... |
18 |
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3.1. |
Power Management...................................................................................................... |
20 |
4. |
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MICROCONTROLLER MediaTek...................................................................................... |
21 |
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4.1. |
Description ................................................................................................................... |
21 |
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MT5365 (Main IC) (U1) .............................................................................................................. |
21 |
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4.2. |
MediaTek Block Diagram............................................................................................ |
28 |
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4.3. |
Reset Circuit................................................................................................................. |
29 |
5. |
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CI INTERFACE....................................................................................................................... |
29 |
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CI Interface Power Switch: ...................................................................................................... |
29 |
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6. |
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USB INTERFACE ................................................................................................................... |
30 |
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7. DDR3 SDRAM NTC-DDR3-1Gb-D-R12........................................................................... |
30 |
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Description: .................................................................................................................................. |
30 |
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Features: ................................................................................................................................... |
31 |
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8. |
SCALER AND LVDS SOCKETS........................................................................................... |
33 |
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8.1. |
LVDS sockets Block Diagram ..................................................................................... |
33 |
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8.2. |
Panel Supply Switch Circuit ........................................................................................ |
34 |
9. |
NAND FLASH MEMORY K9F1G08U0D.......................................................................... |
34 |
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9.1. |
General Description...................................................................................................... |
34 |
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9.2. |
Features ........................................................................................................................ |
35 |
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9.3. |
Pinning ......................................................................................................................... |
35 |
10. I-LM1117/LM 800mA Low-Dropout Linear Regulator...................................................... |
36 |
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11. |
CONNECTORS ................................................................................................................... |
37 |
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11.1. |
SCART (SC1) .............................................................................................................. |
37 |
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11.2. |
HDMI (CN707,CN708) ............................................................................................... |
37 |
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11.3. |
VGA (CN711).............................................................................................................. |
38 |
12. |
SERVICE MENU SETTINGS............................................................................................. |
39 |
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12.1. |
Video Settings .............................................................................................................. |
40 |
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12.2. |
Audio Settings.............................................................................................................. |
41 |
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12.3. |
Options ......................................................................................................................... |
42 |
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12.4. |
Tuning Settings ............................................................................................................ |
44 |
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12.5. |
Source Settings............................................................................................................. |
45 |
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12.6. |
Diagnostic..................................................................................................................... |
46 |
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12.7. |
USB Operations............................................................................................................ |
47 |
13. |
SOFTWARE UPDATE........................................................................................................ |
47 |
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14. |
TROUBLESHOOTING....................................................................................................... |
47 |
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14.1. |
No Backlight Problem.................................................................................................. |
47 |
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14.2. |
CI Module Problem...................................................................................................... |
49 |
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14.3. |
Led Blinking Problem .................................................................................................. |
50 |
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14.4. |
IR Problem ................................................................................................................... |
51 |
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14.5. |
Keypad Touchpad Problems ........................................................................................ |
52 |
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14.6. |
USB Problems.............................................................................................................. |
52 |
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14.7. |
No Sound Problem ....................................................................................................... |
53 |
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14.8. No Sound Problem at Headphone ................................................................................ |
53 |
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14.9. |
Standby On/Off Problem.............................................................................................. |
53 |
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14.10. |
No Signal Problem ................................................................................................... |
54 |
1. INTRODUCTION
17MB8
mainboard is driven by MediaTek MT5356. This IC is capable of handling Video and audio processing, Scaling-Display processing, 3D comb filter, OSD and text processing, LVDS/mini-LVDS transmitting, channel and MPEG2/4 decoding, integrated DVB-T/C demodulator and media center functionality.
TV supports PAL, SECAM, NTSC colour standards and multiple transmission standards as B/G, D/K, I/I , and L/L including German and NICAM stereo. Also DVB T, DVB-C are supported internal demoulators of MediaTek IC and DVB-S/S2 is supported with externall demodulator.
Sound system output is supplying max. 2x8W ( less 10%THD at max output) for stereo 8
speakers.
Supported peripherals are:
1 RF input VHF I, VHF III, UHF @ 75Ohm(Common) 1 Side AV (CVBS, R/L_Audio)
1 SCART socket(Common)
1 YPbPr (Optional)
1 PC input(Common)
2 HDMI 1.3 input(1 HDMI input is common, 1 input is optional) 1 S/PDIF output(Optional)
1 Headphone(Optional)
1 Common interface(Common)
1 USB input is 
ommon)
1 On-board Keypad(Optional)
1 External Keypad(Optional)
1 External TouchPad(Optional)
1.1.General Block Diagram
1. TUNER(S
2156)
The Si2156 integrates a complete hybrid TV tuner supporting all worldwide terrestrial and cable TV standards. Leveraging Silicon Labs field proven third generation digital low-IF architecture, the Si2156 maintains the unmatched performance and design simplicity of the original Si2153 while further reducing footprint size. No external LNAs, tracking filters, 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 realworld conditions due to its very high linearity and low noise. Interfacing the Si2156 seamlessly with the Si2165 DVB-T/C demodulator creates a DVB-T/C receiver plus PAL/SECAM tuner. The Si2156 is pin-compatible with the Si2176 hybrid TV tuner with analog demodulator, providing customers unparalleled design flexibility.
Features :
BLOCK DIADRAM
M88TS2022 (Optional)
M88DS3002 (Optional)
2. AUDIO AMPLIFIER STAGE
STA381BWS
2.1.General Description
The STA381BWS is an integrated solution embedding digital audio processing, digital amplification,
FFXTM power output stage, headphone and 2 Vrms line outputs. It is part of the Sound Terminal® family and provides full digital audio streaming from the source to the speaker, offering cost effectiveness, low power dissipation and sound enrichment.
The STA381BWS input section consists of a flexible digital input serial audio interface, feeding the digital processing unit, and an analog 1 Vrms input for a seamless connection with pure analog sources. The serial audio data input interface supports many formats, including the popular IIS format.
The STA381BWS is based on an FFXTM (Fully Flexible Amplification) processor, an STMicroelectronics proprietary technology. FFXTM is the evolution of the ST ternary technology: the advanced processor is available for ternary, binary, binary differential and phase shift PWM modulation. STA381BWS embeds the ternary, binary and binary differential implementations, a subset of the full capability of the FFXTM processor.
The STA381BWS power section consists of four independent half-bridges. These can be configured via digital control to operate in different modes. A 2.1 channel setup can be implemented with two half-bridges (L/R) together with a single full-bridge (subwoofer).
Alternatively, the 2.0 channel setup can be done with two full-bridges. When using this configuration an external amplifier, for the SW channel, can be also driven through the PWM output. The STA381BWS is able to deliver 2 x 20 W (ternary) into an 8 W load at 18 V or 2 x 9 W (binary) into a 4 W load plus 1 x 20 W (ternary) into an 8 W load at 18 V. The STA381BWS also provides a capless headphone out (with embedded negative charge pump), able to deliver up to 40 mW into a 32 W load or, alternatively, can be configured as a 2 Vrms line output.
The STA381BWS digital processing unit includes up to 12 programmable biquads (EQs) allowing perfect sound equalization and offering advanced noise-shaping techniques.
Moreover, the coefficient range ensures a great variety of filter shapes (low/high-pass, low/high shelf, peak, notch, band-pass). The equalization engine is fully compatible with the ST speaker compensation technology embedded into the APWorkbench suite. A state-ofthe- art multi-band DRC, STCompressorTM, equalizes the system to provide active speaker protection with full audio quality preservation against sudden sound peaks. Moreover, STSpeakerSafeTM technology offers reliable speaker protection under any condition. The master clock can be from stable BICKI (64xfs, 50% duty cycle) or external XTI.
2.2.Features
Features
Wide-range supply voltage
4.5 V to 25.5 V (operating range)
27 V (absolute maximum rating)
I2C control with selectable device address
Full IC protection embedding:
Manufacturing short-circuit protection (out vs. gnd, out vs. vcc, out vs. out)
Thermal protection
Overcurrent protection
Undervoltage protection
1 Vrms stereo analog input
I2S interface, sampling rate 32 kHz ~ 192 kHz, with internal sampling frequency converter for fixed processing frequency
Three output power stage configurations
2.0 mode, L/R full bridges
2.1 mode, L/R two half-bridges, subwoofer full bridge
2.1 mode, L/R full bridges, PWM output for external subwoofer amplifier
Driving load capabilities
2 x 20 W into 8 W ternary modulation
2 x 9 W into 4 W + 1 x 20 W into 8 W
FFXTM 100 dB dynamic range
Fixed output PWM frequency at any input sampling frequency
Embedded RMS meter for measuring real-time loudness
Two analog outputs:
Selectable headphone / line out driver with adjustable gain via external resistors
Auxiliary F3XTM analog output for external driver
Headphone:
Embedded negative charge pump
Full capless output configuration
Driving load capabilities: 40 mW into 32 W
Line out:
2 Vrms line output capability
Up to 12 user-programmable biquads with noise-shaping technology
Direct access to coefficients through I2C shadowing mechanism
Fixed (88.2 kHz / 96 kHz) internal processing sampling rate
Two independent DRCs configurable as a dual-band anticlipper or independent limiters/compressors (B2DRC)
Digital gain/att +48 dB to -80 dB with 0.125 dB/step resolution
Independent (fade in, fade out) soft volume update with programmable rate 48 ~ 1.5 dB/ms 
Bass/treble tones control
Audio presets:15 crossover filters, 5 anticlipping modes, nighttime listening mode
STSpeakerSafeTM protection circuitry:
Pre and post processing DC blocking filters
Checksum engine for filter coefficients
PWM fault self-diagnosis
STCompressorTM dual-band DRC
2.3.Absolute Ratings
2.3.1.Electrical Characteristics
2.3.2.Operating Specifications
2.4.Pinning
TS4962M (Optional 2,5W)
3. POWER STAGE
The DC voltages required at various parts of the chassis and panel are provided by a main power supply unit. MB8
chassis can operate with PW05, IPS60, IPS70, IPS16, IPS17, IPS19, PW25, PW26, PW82-3, PW03, PW04, PW06, PW07 as main power supply and also with 12V adaptor.
Which power board can be used for board to board or cable connection?
Board to board (BTB) : PW05, IPS60, IPS70, IPS16, IPS17, IPS19
Power Cable : PW25, PW26, PW82-3, PW03, PW04, PW06, PW07
The power supplies generate 24V, 12V, 5V, 3,3V and 12V, 5V,3.3V stand by mode DC voltages. Power stage which is on-chassis generates 5V, 3V3 stand by voltage and 12V, 8V, 5V, 3V3, 2.5V, 1,8V and 1,2V supplies for other different parts of the chassis. Chassis block diagram is indicated below.
The blocks on power block diagram is using dependent to main supply. For PW26 and PW27 just common blocks are enough for proper operation.
Short CCT Protection Circuit
Short circuit protection is necessary for protecting chassis and main IC against damages when any Vcc supply shorts to ground. Protect pin should be logic high while normal operation. When there is a short circuit protect pin shold be logic low. After any short detection, SW forces LEDs on LED card to blink.
3.1.Power Management
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