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VESTEL MB300 User Manual

VESTEL MB300
90 pages
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MB300 IDTV
SERVICE MANUAL
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VESTEL MB300 Specifications

General IconGeneral
BrandVESTEL
ModelMB300
CategoryTV
LanguageEnglish

Summary

1. Introduction

2. Tuner

Digital and Analog TV Tuner (Si2151 / U6)

Silicon Labs' sixth-generation hybrid TV tuner supporting all worldwide terrestrial and cable TV standards.

Digital Satellite Tuner (AV2018 / U27)

Highly integrated silicon tuner for DVB-S2 standard, integrating synthesizer, crystal oscillator, LDO, etc.

3. LNB Supply and Control IC (MPS8126 / U26)

4. Demodulator Stage (Si2169 / U5)

5. Audio Amplifier Stages

Main Amplifier (AD82587D / U13) (10W)

Digital audio amplifier capable of driving a pair of 8 ohm, 20W or a single 4 ohm, 40W speaker.

Subwoofer Amplifier (AD82586C / U14) (12 W)

Digital audio amplifier capable of driving a pair of 8 ohm, 20W operating at 24V supply.

Headphone Amplifier (AD22657B / U23)

2-Vrms cap-less stereo line driver, ideal for single supply electronics.

Subwoofer Preamplifier (AD22657B / U22)

Used for subwoofer out, as well.

SCART Audio Amplifier (TL062 / U12)

JFET-input operational amplifiers, low-power versions of TL08x series.

6. Power Stage

NTGS3446 (Q47)

MOSFET with ultra low RDS(on) for higher efficiency and longer battery life.

FDS4685 (Q41)

P-Channel MOSFET optimized for power management applications.

TPS54528 (U30)

Adaptive on-time D-CAP2 mode synchronous buck converter with cost-effective design.

TPS54628 (U28)

Adaptive on-time D-CAP2 mode synchronous buck converter for various power buses.

TPS54821 (U29-U35)

Synchronous stepdown converter optimized for small designs with high efficiency.

RT7278G (U44)

Synchronous DC/DC step-down converter delivering up to 3A output current.

APL5910 (U31-U32-U33)

1A ultra low dropout linear regulator with integrated functions.

LM1117 (U36)

Series of low dropout voltage regulators with a dropout of 1.2V at 800mA.

7. Microcontroller (MEDIATEK MT5827P / U1)

8. Video Back-End Processor (MSTAR – MST7410FE / U3)

9. 4GB DDR3 SDRAM (K4B4G1646D / U7-U8-U9-U10-U11)

10. 32MB SPI FLASH (W25Q32FVSSIG / U4)

11. EMMC Memory (MTFC16GAKAECN-2MWT / U24)

12. USB Interface

TPS2553 (U16-U17-U19-U39)

Power-distribution switches for applications requiring precision current limiting.

13. Reset IC (MAX809 / U41)

14. Software Update

15. Troubleshooting

No Backlight Problem

Troubleshooting for issues where the TV is working but has no picture or backlight.

CI Module Problem

Troubleshooting for when the CI module is not working after insertion.

Staying in Standby Mode

Troubleshooting for when the TV stays in standby mode and does not operate.

IR Problem

Troubleshooting for when the LED or IR remote is not working.

Keypad Touchpad Problems

Troubleshooting for when the keypad or touchpad is not functioning.

USB Problems

Troubleshooting for USB not working or no USB detection.

No Sound Problem

Troubleshooting for no audio output at the main TV speaker.

Standby On/Off Problem

Troubleshooting for when the device cannot boot or hangs in standby mode.

No Signal Problem

Troubleshooting for no signal in DVB-T/T2 or DVB-S/S2 modes.

16. General Block Diagram

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