Videocon Mstar MST719, Mstar MST719DU Service Manual

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MST719 Service Manual

[SERVICE

MANUAL]

Mstar MST719DU

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Summary of Contents for Videocon Mstar MST719, Mstar MST719DU

Page 1 MST719 Service Manual [SERVICE MANUAL] Mstar MST719DU...
Page 2: Table Of Contents
MST719 Service Manual Contents 1. Introduction chassis block diagram ----------------------------------4 2. MST719 IC Introduction ------------------------------------------5 1) Features description ------------------------------------------5 2) Pins function description -- -----------------------------------7 3. TAS5707 IC Introduction -----------------------------------------13 1) Features description -----------------------------------------13 2) Pins function description --------------------------------------15 4. TDA9885TS IC Introduction ---------------------------------------17 1) Features description -----------------------------------------17 2) Pins function description --------------------------------------21 5.
Page 3 MST719 Service Manual ！ 1. warning! High voltage , don’t touch it when it’s working 2. Please confirm the power to Panel is +5V when change main board, if not ,the panel can’t work or be damage...
Page 4: Introduction Chassis Block Diagram
MST719 Service Manual 1. Introduction chassis block diagram MST719 chassis is composed of power management,Tuning circuit, IF Amplifier circuit, TDA9885 is the IF-PLL demodulators, CVBS and Sound decode,video processing circuit. The MST719DU is the main IC combines the functions of 2D comb filter Decode and 2De-Interlacing ,µ-controller.
Page 5: Mst719 Ic Introduction
MST719 Service Manual .MST719 IC Introduction 1)．features description...
Page 6 MST719 Service Manual...
Page 7: Pins Function Description
MST719 Service Manual 2) Pins function description...
Page 8 MST719 Service Manual...
Page 9 MST719 Service Manual...
Page 10 MST719 Service Manual...
Page 11 MST719 Service Manual...
Page 12 MST719 Service Manual ...
Page 13: Tas5707 Ic Introduction
MST719 Service Manual 3. TAS5707 IC Introduction 1) Features description ...
Page 14 MST719 Service Manual...
Page 15: Pins Function Description
MST719 Service Manual 2). Pins function description...
Page 16 MST719 Service Manual...
Page 17: Tda9885Ts Ic Introduction
MST719 Service Manual 4. TDA9885 IC Introduction features description 1) ...
Page 18 MST719 Service Manual Block diagram:...
Page 19 MST719 Service Manual...
Page 20 MST719 Service Manual...
Page 21: Pins Function Description
MST719 Service Manual 2). Pins function description SYMBOL DESCRIPTION Number VIF1 VIF differential input 1 VIF2 VIF differential input 2 Output port 1; open-collector FMPLL FM-PLL for loop filter DEEM de-emphasis output for capacitor AF decouping input for capacitor DGND Digital ground Audio output Tuner AGC TakeOver Point (TOP) for resistor adjustment...
Page 22: Pcm1808 Adc Ic Introduction
MST719 Service Manual PCM1808 ADC IC Introduction For all sound source ADC.
Page 23: Sn74Lvc1Gx04Dck Ic Introduction
MST719 Service Manual SN74LVC1GX04DCK IC Introduction...
Page 24: En25F40 Ic Introduction
MST719 Service Manual 7. EN25F40 IC Introduction...
Page 25: Cs4344 Ic Introduction
MST719 Service Manual 8. CS4344 IC Introduction (HDMI Sound DAC)
Page 26: Other Ics Introduction
MST719 Service Manual 9. Other ICs Introduction a) 74HC4052D (U14,U15) for external audio source switch. b) PI5V330 (U6) for option external module DVD or USB with YPbPr signal switch,If not use DVD or USB function this IC no need install. c) RC4558 (U4) for AV output audio amplifier, because the external audio signal by 74hc4502D switched the audio level not enough(under 620MVrms).
Page 27: Connectors And Electronics Parameter
MST719 Service Manual Connectors and electronics parameter 1) System connection block diagram as follow: Note: S-Video&YPbPr Audio input Common AV1 Audio sockets input.
Page 28 MST719 Service Manual (POWER AND Inverter CONN ) CN21 Symbol Function Electronic parameter POWER 4.75~5.25V POWER 4.75~5.25V +5V Sb POWER 4.75~5.25V On≈4.5V Off=0~0.6V ON/OFF +12V POWER 10.8~13.2V +12V POWER 10.8~13.2V BLK_ADJ Back lamp brightness adjust (0.07~4.4V) 0.07V= Max. brightness BLK_EN Back lamp ON: ≈4.3V;...
Page 29 MST719 Service Manual (For HDMI EDID Loading) CN17 Symbol Function Electronic parameter ( Panel Power supply Selection ) CN20 Symbol Function Electronic parameter +12V Option +12V Optional panel VCC Select power to panel power supply Option +5V +3.3V Option +3.3V ( Panel LVDS CONN ) CN14 Symbol...
Page 30: Usual Fault
MST719 Service Manual 6. Usual fault 1), Can’t work(fault description: LED is off or red LED is always on ) Check the 5V_STB have +5V or not. If OK Firstly confirm if the AC power supply please check main chassis. mains Switch is ok, and then Check if the 2.
Page 31: Back Lamp Can't Be
MST719 Service Manual 2). Back lamp can’t be on Firstly check if the power supply Check if the voltage of the CN21 pin4 STB output 12V, 5VS and 5V_STB is ok. on/off is high level to 4.5V Check the pin voltage of the Check the component Q7 and the relevant connector CN21 pin 11 Bright on/off circuit work normal.
Page 32: Image Abnormity
MST719 Service Manual 3),Image abnormity ( white screen or no picture) First check the LVDS line connect Change the LVDS line. from main board to panel interface 2. If have not +5V power supply, is OK, then check the panel supply Check U3 5V switch and MST719 power +5V I/O control circuit.
Page 33: No Sound
MST719 Service Manual 4). No Sound Check the power supply board. Firstly Check if audio Source input is ok. Check if the power supply FB8 12V Check the CN21 pin 8,9 power is ok, FB5,FB16 +3.3V is OK. supply output 12V OK or not. Check if the U16 TAS5707 pin 19 Check the Q23,Q21 and the I2C voltage is high to 3.6V, Check the...