VESTEL MB185 IDTV Service Manual
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VESTEL MB185 IDTV Service Manual

VESTEL MB185 IDTV Service Manual

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MB185 IDTV
SERVICE MANUAL

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Summary of Contents for VESTEL MB185 IDTV

  • Page 1 MB185 IDTV SERVICE MANUAL...

  • Page 2: Table Of Contents

    Table of Contents 1. INTRODUCTION ..................................2 SSB LAYOUT ....................................3 2. T/T2/C/A TUNER (U107) ................................4 3. S/S2 TUNER (U3) OPTIONAL ..............................6 4. AUDIO AMPLIFIER STAGES ..............................8 MAIN AMPLIFIER (U118) (8W/10W/12W options)........................ 8 SUB-WOOFER AMPLIFIER (U1) ............................11 5.

  • Page 3: Introduction

    1. INTRODUCTION 17MB185 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: ...

  • Page 4: Ssb Layout

    SSB LAYOUT Subwooferr Con. Subwoofer Power Con. ANT. EMMC MAIN S/PDIF Audi Speaker Internal Con. Wifi& BT Connector...

  • Page 5: T/T2/C/A Tuner (U107)

    2. T/T2/C/A TUNER (U107) 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.

  • Page 7: S/S2 Tuner (U3) Optional

    3. S/S2 TUNER (U3) OPTIONAL Description Figure 2: Pin description...
  • Page 8 Features Block Diagram...

  • Page 9: Audio Amplifier Stages

    4. AUDIO AMPLIFIER STAGES Figure: The block diagram of the audio part A. MAIN AMPLIFIER (U118) (8W/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.
  • Page 10  10V~26V for loudspeaker driver  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 ...
  • Page 11 Figure 4: Functional Block Diagram Table 1: Absolute Maximum Ratings Table 2: Recommended Operating Conditions...

  • Page 12: Sub-Woofer Amplifier (U1)

    B. SUB-WOOFER AMPLIFIER (U1)

  • Page 15: Power Stage

    5. POWER STAGE Figure: Power Block Diagram Figure: 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.
  • Page 16 Figure: Power Block Diagram List of the components:  SW-1(Q103) → FDS4685 8.2A/40V  SW-2(Q104) → DMG8402LDM 4.2A/30V  DC-DC-1(U101) → TPS54528 ADJ/5A  DC-DC-2(U102) → TPS563201 ADJ/3A  DC-DC-3(U105) → TPS563201 ADJ/3A  DC-DC-4(U106) → TPS563201 ADJ/3A  DC-DC-5(U113) → TPS562201 ADJ/2A ...

  • Page 17: Fds4685 8.2A/40V (Q103)

    A. FDS4685 8.2A/40V (Q103) Figure: Pin description...

  • Page 18: Dmg8402Ldm (Q104)

    B. DMG8402LDM (Q104) Features  Low RDS(ON)  Low Input Capacitance  Fast Switching Speed  Low Input/Output Leakage  Lead Free By Design/RoHS Compliant (Note 1)  Qualified to AEC-Q101 Standards for High Reliability Pin description...

  • Page 19: Tps54528 (U101)

    Electrical Characteristics & Maximum ratings C. TPS54528 (U101) 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.
  • Page 20  Highly Efficient Integrated FETs Optimized for Lower Duty Cycle Applications – 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 ...

  • Page 21: Tps563200 (U102,U105, U106)

    Functional Pin Description & Electrical Characteristics D. TPS563200 (U102,U105, U106) General Description The TPS562200 and TPS563200 are simple, easy-to- use, 2 A and 3 A synchronous step-down (buck) converters in SOT-23 package. The devices are optimized to operate with minimum external component counts and also optimized to achieve low standby current.
  • Page 22  Cycle-By-Cycle Hiccup Over-current Limit  Non-latch OVP, UVLO and TSD Protections  Fixed Soft Start: 1 ms APPLICATIONS  Digital TV Power Supply  High Definition Blu-ray Disc™ Players  Networking Home Terminal  Digital Set Top Box (STB) Recommended Operating Conditions Table 3: Recommended operating conditions Pin Description...
  • Page 23 Electical Characteristics Pin functions and Electrical Characteristics...

  • Page 24: Mp8774Gq-Z 12A Qfn16 (U122)

    E. MP8774GQ-Z 12A QFN16 (U122) Pin Assignment...

  • Page 27: Microcontroller

    6. MICROCONTROLLER MTK G31 (U108) Description...
  • Page 28 Features...
  • Page 36 Recommended operating condition...

  • Page 37: Emmc

    7. 8 GB EMMC SAMSUNG EMMC 8GB KLM8G1GETF-B041 BGA153 (U128) Description SAMSUNG eMMC is an embedded MMC solution designed in a BGA package form. eMMC operation is identical to a MMC device and therefore is a sim-ple read and write to memory using MMC protocol v5.1 which is a industry standard.

  • Page 38: Usb Interface

    8. USB INTERFACE USB POWER SWITCH ADJ SAFE TPS25221 SOT23-6 (U117-U109)

  • Page 39: Ci Interface

    9. CI INTERFACE 17MB185 Digital CI ve Smart Card Interface Block diagram: Figure: CI interface...

  • Page 40: Software Update

    10. SOFTWARE UPDATE MAIN SOFTWARE UPDATE In 17MB185 project, please follow software update procedure: Method-1 1. Copy MstarUpgrade.bin to USB stick (root directory, FAT32) 2. Enter M-Boot console first (Long press "ENTER" key on Tera Term Console when your device reboot then do AC On) 3.
  • Page 41 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.

  • Page 42: Ci Module Problem

    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.

  • Page 44: Ir Problem

    C. IR PROBLEM Problem: LED or IR not working Check LED card supply on 17MB185 chasis.

  • Page 45: Keypad Touchpad Problems

    D. KEYPAD TOUCHPAD PROBLEMS Problem: Keypad or Touchpad is not working Check keypad supply on 17MB185. 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.

  • Page 46: No Sound Problem

    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).

  • Page 47: Standby On/Off Problem

    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.

  • Page 48: İ. No Signal Problem In Dvb-T Mode

    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.

  • Page 49: Service Menu Settings

    12. 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.

  • Page 50: General Block Diagram

    13. GENERAL BLOCK DIAGRAM...
  • Page 51 C370 C380 C378 C376 100n 100n 100n 100n 100n 100n Close to Mstar Side Close To TS6011 VESTEL VESTEL 17MB185 17MB185 PROJECT NAME : PROJECT NAME : SCH NAME : SCH NAME : TUNER_SAT_LNB TUNER_SAT_LNB T. SHT: T. SHT: <YOUR NAME HERE>...
  • Page 52 12V_VCC Q109 Value Description R273 PANEL_VCC_ON/OFF 3'b010 ARM boot from ROM; outer storage is eMMC BC848B needs GND shielding VESTEL 17MB185 C141 3'b011 ARM boot from ROM; outer storage is NAND PROJECT NAME : UART DEBUG SCH NAME : VBYONE T.
  • Page 53 USB_ENABLE_1 R353 R351 3v3_HUB Decoupling CN117 F134 3V3_VCC 3V3_HUB C393 C400 C413 C392 C414 C416 100n 100n 100n 100n 100n VESTEL 17MB185 PROJECT NAME : SCH NAME : T. SHT: <YOUR NAME HERE> DRAWN BY : 14/07/2021:17:44 A X M...
  • Page 54 R334 5V_STBY BC848B 5V_VCC TP11 100n HDMI1_5V C356 220R R445 R325 Q134 JK101 BC848B C364 VESTEL 17MB185 PROJECT NAME : R444 TP145 Q133 HOTPLUG1 HOTPLUG1 BC848B SCH NAME : HDMI_GPIO T. SHT: R333 <YOUR NAME HERE> DRAWN BY : 10/05/2021:14:09...
  • Page 55 CI_IRQA TS0_VALID CI_A1 TS0_SYNC CI_A0 TS0_D0 CI_D0 R163 R118 TS0_D1 CI_D1 TS0_D2 CI_D2 PCM_CD2 3V3_VCC CI_PWR R108 R109 R117 VESTEL 17MB185 PROJECT NAME : SCH NAME : CI_EMMC T. SHT: <YOUR NAME HERE> DRAWN BY : 04/05/2021:12:30 A X M...
  • Page 56 S160 TP143 HP_OUT_L HP_DETECT JK102 F102 60R R330 3V3_VCC 3V3_AMP_SW C312 R327 C102 100n HP_OUT_R C374 C369 220p VESTEL 17MB185 PROJECT NAME : SCH NAME : AUDIO AMPs T. SHT: <YOUR NAME HERE> DRAWN BY : 10/05/2021:14:01 A X M...
  • Page 57 AVDD_DRAM_A, 2 pins 150mA,20mil R226 1V5_DRAM DRAM_VREF_A R227 TP136 IO_CAL_AF]PLRF^ TP135 IO_CAL_BF]PHRF^ MT9685LAAJAC U108 GS100 1V5_DRAM DRAM_VREF_B GS101 R225 VESTEL 17MB185 PROJECT NAME : SCH NAME : MAIN_POWER T. SHT: <YOUR NAME HERE> DRAWN BY : 19/04/2021:11:16 DRAM__VREF_A A X M...
  • Page 58 VFB_1V_CPU Vout=0.6x(1+(R1/R2)) C178 C435 100n R463 100n 120K 12V_VCC R1=20k R2=30k Vout=1V MAX809LTR C462 U124 VESTEL 17MB185 PROJECT NAME : LNB_FAULT R437 SCH NAME : POWER T. SHT: S216 <YOUR NAME HERE> DRAWN BY : 03/05/2021:16:01 CORE_RESET A X M...

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