A. FDC642P (Q200) ...................................................................................................................................................... 13
B. NTGS3446 (Q100) ................................................................................................................................................... 13
C. RT7278G (U101) ...................................................................................................................................................... 15
D. TPS563200 (U100, U153, U125) .............................................................................................................................. 17
E. MP8774GQ-Z 12A QFN16 (U154) ............................................................................................................................ 19
F. LDO LM1117 (U130, U140) ...................................................................................................................................... 22
USB POWER SWITCH ADJ SAFE TPS25221 SOT23-6 (U117-U109) .......................................................................... 34
10. CI INTERFACE ................................................................................................................................................... 36
Main Software Update ............................................................................................................................................ 37
A. No Backlight Problem .............................................................................................................................................. 37
B. CI Module Problem .................................................................................................................................................. 39
C. IR Problem ................................................................................................................................................................ 40
D. Keypad Touchpad Problems .................................................................................................................................... 41
E. USB Problems ........................................................................................................................................................... 41
F. No Sound Problem ................................................................................................................................................... 42
G. Standby On/Off Problem ......................................................................................................................................... 43
H. No Signal Problem in DVB-S/S2 mode ..................................................................................................................... 43
İ. No Signal Problem in DVB-T mode ........................................................................................................................... 44
13. SERVICE MENU SETTINGS ............................................................................................................................. 45
14. GENERAL BLOCK DIAGRAM ......................................................................................................................... 46
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15. PLACEMENT OF BLOCKS ................................................................................................................................ 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
17MB170 main board is driven by MTK 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 board can be driven 50Hz UHD panels.
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
• Multi-purpose CPU for OS and multimedia
• Peripheral and power management
• Embedded DRAM (for connected option)
Supported peripherals are:
• 1 RF input VHF I, VHF III, UHF
• 1 Satellite input
• 1 Back AV (CVBS, R/L_Audio)
• 1 PC input(Common)
• 4x HDMI inputs (with ARC option from 2nd or 3rd input)
• 1 Common interface(Common)
• 1 Optic/ Quax S/PDIF output
• 1 Headphone(Common)
• 2 USB(2X Side) and 1x internal USB for Wifi/Bluetooth
• 1 Ethernet-RJ45
• 1 External Keypad/Tact Switch
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2. T/T2/C/A TUNER (U118)
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
• 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
4
Figure 1: Si2151 Pin description
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3. S/S2 TUNER (U3) OPTIONAL
Description
Figure 2: Pin description
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Features
Block Diagram
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4. AUDIO AMPLIFIER STAGES
Figure 3: The block diagram of the audio part
MAIN AMPLIFIER (U123) (8W/10W/12W OPTIONS)
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 I2S, Left-alignment and Right-alignment data format
− 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
9
Figure 4: Pin description
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Figure 5: Functional Block Diagram
Table 1: Absolute Maximum Ratings
10
Table 2: Recommended Operating Conditions
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5. POWER STAGE
Figure 6: Power Block Diagram
Figure 7: Power Socket and Power Options
Power socket is used for taking 12V_STBY voltage which is produced in power card. Also socket is used for
giving dimming, backlight and standby signals with power card. Power socket pinning is shown in above
figure.
12V_STBY is converted several different voltages on the mainboard which are shown in below figure.
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List of the components:
• SW-1(Q200) → FDC642P 4A/20V
• SW-2(Q100) → NTGS3446 5.1A/20V
• DC-DC-1(U101) → RT7278G ADJ/3A
• DC-DC-2(U100) → TPS563200 ADJ/3A
• DC-DC-3(U104) → RT6213BHGJ6F ADJ/3A
• DC-DC-4(U153) → TPS563200 ADJ/3A
• DC-DC-5(U125) → TPS563200 ADJ/3A
• DC-DC-6(U154) → MP8774GQ-Z 12A QFN16
• LDO-1(U130) → LDO LM1117
• LDO-2(U140) → LDO LM1117
Figure 8: Power Block Diagram
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A. FDC642P (Q200)
Figure 9: Pin description
B. NTGS3446 (Q100)
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)
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Figure 10: Pin description
Table 3: Maximum ratings
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C. RT7278G (U101)
Figure 11: Pin Assignment
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D. TPS563200 (U100, U153, U125)
Figure 12: Pin Assignment
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Electrical Characteristics
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E. MP8774GQ-Z 12A QFN16 (U154)
Figure 13: Pin Assignment
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F. LDO LM1117 (U130, U140)
Description
The LM1117 is a low power positive-voltage regulator designed to meet 1A output current and comply with
SCSI-II specifications with a fixed output voltage of 2.85V. This device is an excellent choice for use in
battery-powered applications, as active terminators for the SCSI bus, and portable computers. The LM1117
features very low quiescent current and very low dropout voltage of 700mV at a full load and lower as output
current decreases. LM1117 is available as an adjustable or fixed 1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, and
5.0V output voltages. The LM1117 is offered in a 3-pin surface mount package SOT-223 & TO-263. The
output capacitor of 10㎌ or larger is needed for output stability of LM1117 as required by most of the other
regulator circuits.
Features
● Output Current up to 1 A
● Low Dropout Voltage ( 700mV at 1A Output Current )
● Three Terminal Adjustable or Fixed 1.5V, 1.8V, 2.5V, 2.85V,
3.0V, 3.3V, 5.0V
● 2.85V Device for SCSI-II Active Terminator
● 0.04% Line Regulaion, 0.1% Load Regulation
● Very Low Quiescent Current
● Internal Current andTerminal Limit
● Logic-Controlled Electronics Shutdown
● Surface Mount Package SOT-223 & TO-263 (D2-Pack)
BACKLIGHT_ON/OFF pin should be high when the backlight is ON. Collector pin of Q113 must be low
when the backlight is OFF. If it is a problem, please check Q181. Also it can be tested in TP500 or Pin5 of CN2
in main board. Please also check panel cables.
Dimming pin should be high or square wave in open position. If it is low, please check S294 for MTK side.
It also can be checked at TP499. Please also check panel or power cables and connectors.
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Panel power supply should be in panel specs. Please check Q151, shown below; also it can be checked
TP276.
STBY_ON/OFF should be low for TV on condition, please check Q114’s collector.
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B. CI MODULE PROBLEM
Problem: CI is not working when CI module inserted.
Possible causes: Supply, supply control pin, detects pins, mechanical positions of pins.
• CI supply should be 5V when CI module inserted. If it is not 5V please check CI_PWR_CTRL, this pin
should be low.
• Please check mechanical position of CI module. Is it inserted properly or not?
• Detect ports should be low. If it is not low please check CI connector pins, CI module pins.
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C. IR PROBLEM
Problem: LED or IR not working
Check LED card supply on MB170 chasis.
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D. KEYPAD TOUCHPAD PROBLEMS
Problem: Keypad or Touchpad is not working
Check keypad supply on MB170.
E. USB PROBLEMS
Problem: USB is not working or no USB Detection.
Check USB Supply, It should be nearly 5V. Also USB Enable should be logic high.
USB Control is optional, so U109 and U117 may not be added. Check supply voltages only.
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F. NO SOUND PROBLEM
Problem: No audio at main TV speaker outputs.
Check supply voltages of 24V_VCC, VDD_AUDIO and 3V3_AMP with a voltage-meter. There may be a
problem in headphone connector or headphone detect circuit (when headphone is connected, speakers are
automatically muted). Measure voltage at HP_DETECT pin, it should be 3.3V.
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G. STANDBY ON/OFF PROBLEM
Problem: Device cannot boot, TV hangs in standby mode.
There may be a problem about power supply. Check main supplies with a voltage-meter. Also there may be
a problem about SW. Try to update TV with latest SW. Additionally it is good to check SW printouts via
Teraterm program. These printouts may give a clue about the problem. You can use VGA for Teraterm
program connection.
H. NO SIGNAL PROBLEM IN DVB-S/S2 MODE
Problem: No signal or Low signal in DVB-S/S2 mode.
Check signal cables and LNB voltage, if there is no problem, check M88TS6011 (U3) supply voltages;
3V3_VCC_SAT.
If the above measurements are OK, then measure the voltage from the PIN1 of U3.
If the PIN9 voltage is equal to 0V, please check i2c waveforms and software. If the PIN9 voltage is lower
than 1V(e.g: 0.8Vor 0.3V), change the U3 with a new part.
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İ. NO SIGNAL PROBLEM IN DVB-T MODE
Problem: No signal or Low signal in DVB-T mode.
Check signal cables and LNB voltage, if there is no problem, check SI2151 (U118) supply voltages;
3V3_TUNER.
If the above measurements are OK, then change the U118 with a new part.
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13. SERVICE MENU SETTINGS
In order to reach service menu, first chose Channel, then press “MENU” buton, press “Advanced Options”
then write “4725” by using remote controller.
You can see the service menu main screen below. You can check SW releases by using this menu under
Diagnostic title. In addition, you can make changes on video settings, audio settings, DAP Parameters etc. using
regarding titles. You may also use USB Operations for SW update and update Unique Keys and Configuration
files.
Service Menu
Diagnostic
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14.GENERAL BLOCK DIAGRAM
PANEL_VCC
51 pi ns Vby ONE SOCKET
1V5_VCC
1V5_VCC
2Gb DDR3
MEMORY
1V5_VCC
2Gb DD R3
MEMORY
TUNER_SCL
TUNER_SDA
HP_DETECT
DISEQC_OU T
3D_ SYNC
BACKL IGH T_ON/OFF _OUT
TOUCHPAD_SDA
TOUCHPAD_SCL
STR_EN
WOWL _DET
WOWL _EN
LED1
LED2
AUX_RESE T
BACK LIG HT _DI M
KEYBO ARD
PANEL_VCC_ON/OFF
AMP_RST
TS_CLK_ D2
TS_SY NC_ D2
WIFI/BT _ENABLE
SYS_SCL
SYS_SDA
ESMT
AD82587D
2X6W/8W/
10W AMP
SPEAKERs
Speak. Connector
12V_VCC
LNBP
TI
TPS65233
5V_VCC
SYS_SCL
CI SOCKET
SAT TUNER
Montage
M88TS6011
RF
Bypass
Opt
DVB S/S 2
Rese tN
3V3_VCC
3V3_VCC
BUFFER _EN
BUF
BUFFER _EN
BUF
TUNE R
Si2151
CY7C65632
USB HUB
AD22657B
HP AMP.
24MH z
12V/24V_VC C
BAV AUDIO IN
Keyboard Socket
Led/IR Socke t
HP_OUT_R
HP_OUT_L
SPDIF OUT
VGA
HEADPHONE
IN
Y/CVBS PbPr
HDMI 5V
RAM BUS
I2C
ARC
ADDRESSDATA
HDMI 3
I2C
HDMI 5V
HDMI 4
I2C
GPIOs
HP_RIGHT
HP_LEFT
SAV_R_IN
SAV_L_IN
AUDI O I/ OsVID EO I/Os
SPDIF_OUT
VGA HS/VS
BAV_ CVB S
IN
YPbPr
XTAL
2
PWR
STBY
NAND
HDMI 5V
3V3_VCC
1V8_VCC
3V3_VCC
Keybo ard
IR – Led1/2
GPIOs
KEYBOARD
STBY_ON/
OFF
DATA
TS_IN
8 Lane VbyONE
LVDS/VbyONE
PWR
3
TS B LOC K
TS_OUT
SERIAL T S
IN
DIGIT AL
DEM OD
SAT
PWR
4
ETHERNET
ET_T
ET_R
SYS_SCL
SYS_SDA
USB_4 _DP
USB_4 _DN
Bypass
Opt
DEM OD
2.0
USB 3
DIGIT AL/
ANALOG
USB 4
USB 1
USB 2
2.0
US B_WIFI _DP
US B_WIFI _DN
2.0
2.0
USB2_ DP
USB2_ DN
USB1 _DP
USB1 _DN
Mstar
G22
23X23
HDMI 1HDMI 2
I2C
HDMI 5V
CEC
46
5V_V CC
USB 3
USB 2
5V_VCC
USB 1
5V_VCC
eMM C 8 GB
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15. PLACEMENT OF BLOCKS
LAN
Internal
Connector
Key
LED
CON
Speaker
Power
Con.
V
B
Y
O
N
E
C
O
N
RAM
MAIN
IC
CI
USB
EMMC
47
LNB
HDMI
Connectors
S/PDIF
board
CON
VGA
BAV IN
Audio
Amp
ANT.
Con.
Wifi& BT
USB
HDMI
HP
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