Related Manuals for THOMSON MT31AS
Summary of Contents for THOMSON MT31AS
- Page 1 THOMSON Service Manual For MT31AS Product Support Office 2014/6/11 Model:T28ED12DU-01B;T32ED13DU-01B;T24E12DHU-01B;T24 E12DHU-01W...
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Page 2: Table Of Contents
Service manual of MT31AS Explanation ............................1 1. Important Information ........................2 1.1. Important Safety Instructions ....................2 2. Product Specification ........................4 2.1. Features ............................. 4 2.2. USB multimedia playback format ....................5 2. The physical picture of 28M1300 ....................5 3. -
Page 3: Explanation
Explanation This manual has definite generality. The directory of Main board test is aiming at MT31AS. It is also used in T32ED13DU-01B, T24E12DHU-01B and T24E12DHU-01W. The test of Main board includes three parts: Power unit, flow of signals and specific circuits’... -
Page 4: Important Information
Service manual of MT31AS 1. Important Information 1.1. Important Safety Instructions 1. Read and follow all instructions. 2. Keep these instructions. 3. Heed these warnings. 4. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions. 5. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. - Page 5 Service manual of MT31AS 13. Refer all servicing to qualified service personnel. Service is required when the component is damaged in any way, such as power supply cord or plug damage, liquid spilled on or objects failing onto the component, rain or moisture exposure, abnormal operation, or if the component has been dropped.
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Page 6: Product Specification
Service manual of MT31AS 2. Product Specification 2.1. Features CHIPSET MT5531 MT5531+ATBM7811 Panel Type TFT LCD With LED Backlight PANEL Interface Dual/Single LVDS Interface Resolution(max) 1920×1080 Receiving Range 48.25MHz~863.25MHz 75Ω Input impedance Video System PAL,SECAM Sound System BG,DK,I Max Storage Channels 199CH... -
Page 7: Usb Multimedia Playback Format
Service manual of MT31AS 2.2. USB multimedia playback format Codec Media File Ext. Remark Video Audio VC1,MPEG-1/2/4,DiviX,H.264 .avi ,VP8，AVS MP3, WMA, Max Resolution And Frame .mp4 MPEG-1/2/4,DiviX, H.264 AAC, Rate:1920×1080@30fps .ts/.trp MPEG-1/2/4,H.264 MP2, PCM, Max Data Rate: 20 Mbps .mkv/.mov MPEG-4,H.264... - Page 8 Service manual of MT31AS Back view: Inner view:...
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Page 9: The Exploded View Of 28M1300
Service manual of MT31AS 3. The Exploded view of 28M1300 Please refer to the attachment 1. 4. The Schematic diagram of Main board Please refer to the attachment 2. 5. The Test Guides of Main Board The physic picture of main board:... - Page 10 Service manual of MT31AS The main board can be divided into three parts: Power, BL driver, Decode and input/output. Power includes EMC, Wave filtering, full wave rectifier and DC-DC power unit. The BL driver use constant current source realized by the DC-DC to illumine the light. It can supply constant...
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Page 11: Power Unit
Service manual of MT31AS brightness light source for TV. The part of Decode and input/output can realize the input ports for TV, and decode the signals. The video signals are outputted to panel by LVDS. The sound signals driver the speaker by AMP. It is easy to solve the problem quickly if you are familiar with the main board’s elements because you can deduce the issue components by badness phenomenon. -
Page 12: Back Light Driver Units
Service manual of MT31AS The Schematic diagram of secondary coil 5.2. Back light driver units Back light driver units supply constant currents for LED in module. Constant current source is designed as DC-DC power. It can realize the brightness of BL adjustable and self-protect by appropriative BL driver IC. -
Page 13: Decode And I/O Units
Service manual of MT31AS The waveform of MOS’S The Schematic diagram of BL driver 5.3. Decode and I/O Units 5.3.1. The flow of low voltage power supply Checking the low voltage power supply is principal step when you are maintaining the badness. - Page 14 Service manual of MT31AS The flow of low voltage power supply Test the power supply of Main board when power is on. Test the DS1’s cathode voltage to GND is +12V for debarring the power unit abnormal. 5V_STB and 3.3V_STB are get from +12V by U3 and UA3.
- Page 15 Service manual of MT31AS The comparison fig of standby power supply Main IC uses enable control signals such as POWER_ON, LVDS_PWR_EN, BL_EN and MUTE to control MOS and switch IC to insure Main board work normal. The definition of each enable signal.
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Page 16: Small Signal Process
Service manual of MT31AS The comparison fig of power on supply 5.3.2 Small signal process Decode and I/O part‘s core is main IC (MTK 5531 series chip). IC is used to decoding analog TV signals such as DVB-T and ATSC code. It supports many kinds of standard video signals, HDMI 1.2a, many kinds of audio format codes, panel driver control, T-CON function, two LVDS,... -
Page 17: Control Bus
Service manual of MT31AS The flow of small signal 5.3.3. Control BUS HDMI interface includes three groups of differential data, a group of differential clock transmits media data, and a group of I2C control bus used to EDID and HDCP protocol communication. -
Page 18: Module Circuits Test
Service manual of MT31AS The sketch map of control bus 5.4. Module Circuits Test 5.4.1. The audio power amplifier The IC adopts RICHTEK’s RT9108 chip using 28PIN project. The small sound signals enter IC after separated. The signals are outputted after power amplifier. -
Page 19: Troubleshooting Flow Chart
Service manual of MT31AS The waveform of hardware mute （CH1：QI01 c pole, CH2：PIN SD) The Schematic diagram of AMP IC’s peripheries The Schematic diagram of hardware mute 6. Troubleshooting Flow Chart These flow charts may not match every single defeat TV set, but they can give you useful advices when you meet the same defeats described on the titles below. -
Page 20: Abnormal Display
Service manual of MT31AS Not work Both Check 3.3VSTB and 12V/24V Both have Only Check Power Unit 3.3VSTB Check each Abnormal Check each DC-DC and there DC-DC unit’s terminal voltage outputs, and the Check P_ON, DIM, regulator unit. power supply of BL_ON. - Page 21 Service manual of MT31AS Abnormal display Some of the sources All of the sources defeat defeat Check panel Check the relative parameter; check video signals circuits panel Check the signal circuit between main IC and LVDS socket (resistance, inductance and via holes);...
- Page 22 Service manual of MT31AS Abnormal sound Some of the sources defeat All of the sources defeat Check AMP’s outputs Check abnormal source's audio signal has been inputted into Main IC Check the filter Check the signals from correctly; Check the HDMI...