VESTEL MB185 IDTV Service Manual Download Page 15 | Manualshive

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14

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.

12V_STBY is converted several different voltages on the mainboard which are shown in below figure.

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Summary of Contents for MB185 IDTV

Page 1: ...MB185 IDTV SERVICE MANUAL...

Page 2: ...SWITCH ADJ SAFE TPS25221 SOT23 6 U117 U109 37 9 CI INTERFACE 38 10 SOFTWARE UPDATE 39 Main Software Update 39 11 TROUBLESHOOTING 39 A No Backlight Problem 39 B CI Module Problem 41 C IR Problem 43 D K...

Page 3: ...eatre 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...

Page 4: ...3 SSB LAYOUT Power Con MAIN IC CI LAN LNB ANT HDMI HP USB USB S PDIF Internal Wifi BT Connector LED CON T C O N B O A R D EMMC Audio Amp Speaker Con HDMI HDMI Subwoofer Amp Subwooferr Con...

Page 5: ...eed 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 T...

Page 6: ...5...

Page 7: ...6 3 S S2 TUNER U3 OPTIONAL Description Figure 2 Pin description...

Page 8: ...7 Features Block Diagram...

Page 9: ...lection 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 I2 S...

Page 10: ...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...

Page 11: ...10 Figure 4 Functional Block Diagram Table 1 Absolute Maximum Ratings Table 2 Recommended Operating Conditions...

Page 12: ...11 B SUB WOOFER AMPLIFIER U1...

Page 13: ...12...

Page 14: ...13...

Page 15: ...s 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 12...

Page 16: ...omponents 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 T...

Page 17: ...16 A FDS4685 8 2A 40V Q103 Figure Pin description...

Page 18: ...02LDM 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 de...

Page 19: ...ions 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 t...

Page 20: ...gh Side and 36 m Low Side High Efficiency less than 10 A at shutdown High Initial Bandgap Reference Accuracy Adjustable Soft Start Pre Biased Soft Start 650 kHz Switching Frequency fsw Cycle By Cycle...

Page 21: ...ivalent series resistance ESR output capacitors such as specialty polymer and ultra low ESR ceramic capacitors with no external compensation components TPS562200 and TPS563200 operate in Advanced Eco...

Page 22: ...VLO 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 Condition...

Page 23: ...22 Electical Characteristics Pin functions and Electrical Characteristics...

Page 24: ...23 E MP8774GQ Z 12A QFN16 U122 Pin Assignment...

Page 25: ...24...

Page 26: ...25...

Page 27: ...26 6 MICROCONTROLLER MTK G31 U108 Description...

Page 28: ...27 Features...

Page 29: ...28...

Page 30: ...29...

Page 31: ...30...

Page 32: ...31...

Page 33: ...32...

Page 34: ...33...

Page 35: ...34...

Page 36: ...35 Recommended operating condition...

Page 37: ...ntroller insulates NAND technology from the host This leads to faster product development as well as faster times to market The embedded flash management software or FTL Flash Transition Layer of eMMC...

Page 38: ...37 8 USB INTERFACE USB POWER SWITCH ADJ SAFE TPS25221 SOT23 6 U117 U109...

Page 39: ...38 9 CI INTERFACE 17MB185 Digital CI ve Smart Card Interface Block diagram Figure CI interface...

Page 40: ...of the USB ports on your TV 3 Power on TV and wait until you see the bootlogo 4 You should see logs like below 11 TROUBLESHOOTING A NO BACKLIGHT PROBLEM Problem If TV is working led is normal and ther...

Page 41: ...40 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: ...tects 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...

Page 43: ...42...

Page 44: ...43 C IR PROBLEM Problem LED or IR not working Check LED card supply on 17MB185 chasis...

Page 45: ...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 option...

Page 46: ...s 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 automat...

Page 47: ...ts 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 v...

Page 48: ...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 chang...

Page 49: ...te 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 P...

Page 50: ...49 13 GENERAL BLOCK DIAGRAM...

Page 51: ...C361 27p LNB_OUT C386 50V 1n 0p5 C382 50V 50V C384 1n C387 50V 1n C385 50V 3p3 1n 50V C383 C388 50V 1n LNB_ENABLE SYS_SDA SYS_SCL SYS_SDA SYS_SCL 13 10 9 11 12 5 16 15 14 M88TS6011 6 2 7 8 1 3 4 U114...

Page 52: ...U5 C4 A20 J5 D17 B3 A3 H5 P7 B2 E17 B1 E18 A6 Y8 C3 J4 E14 B4 Y3 B20 B5 C5 V5 H6 AC5 D14 C2 A5 AC9 P2 B6 C6 B10 B9 E2 B15 A19 F4 B7 B8 C8 A9 B12 C12 C13 B14 E5 C17 F6 C9 C14 A10 C10 D18 D2 B11 F5 C11...

Page 53: ..._HUB_DP USB_HUB_DN S175 S174 S171 S169 C408 18p 50V C420 50V 18p 2 4 1 3 X103 24MHz 1M R369 R346 100k 100k R347 100k R348 2 R321 4k7 1 2 1 R320 4k7 1 4k7 R319 2 DAA_SPDIF CN116 2 8 7 6 5 4 3 1 60R F13...

Page 54: ...15 14 13 12 11 10 9 8 7 6 5 4 3 2 33R R262 100R R308 33R R332 R315 33R 3n3 C322 S143 C323 3n3 S144 16V 100n C296 F126 220R 33R R257 33R R261 CN109 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5...

Page 55: ..._D1 TS1_D2 TS1_D3 TS1_D4 TS1_D5 TS1_D6 TS1_D7 TS1_CLK TS1_VLD TS1_SYNC PCM2_WAIT_N 2 U108 AD18 R28 T26 R26 V27 W26 U27 V26 T27 R27 U26 T28 AB22 AC19 AB18 AC22 AE20 AD20 AC20 AB20 AE21 AB19 AD19 AD17 A...

Page 56: ...R265 33k R267 10k 1 2 AMP_EN 100k R269 1 2 BC848B Q116 3 2 1 R279 100k 1 2 16V C317 100n 4k7 R253 AMP_MUTE 5V_VCC 4k7 R252 R290 10k1 2 10k R278 1 10k R289 1 2 100u C343 16V 1 2 VDD_AUDIO S150 1 2 10k...

Page 57: ...AF3 AE25 AE16 AE10 AE9 AE7 AE4 AE2 AD26 AD10 AD6 AD5 AD4 AC10 AB14 AA2 W10 W9 W8 V11 V12 V18 K27 K10 K9 J12 J10 J9 J8 J7 H26 H25 H21 H20 H19 H18 H16 H15 H14 H13 H4 G26 G25 G24 G22 G21 N22 N21 N20 N19...

Page 58: ...2 F105 60R S103 F106 60R CN102 12 11 10 9 8 7 6 5 4 3 2 1 CN103 12 11 10 9 8 7 6 5 4 3 2 1 TP111 1 TP113 1 TP112 1 TP114 1 power_pin1 power_pin1 power_pin9 power_pin9 Backlight On Off Circuit NC R2 n...

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