Videocon Mstar MST719, Mstar MST719DU User manual

MST719 Service Manual
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[SERVICE MANUAL]
Mstar MST719DU

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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. PCM1808 ADC IC Introduction--------------------------------------22
6. SN74LVC1GX04DCK IC Introduction ---------------------------------23
7. EN25F40 IC Introduction ------------------------------------------24
8. CS4344 IC Introduction ------------------------------------------25
9. Other ICs introduction ------------------------------------------26
10. Connectors and electronics parameter-------------------------------27
11. Usual fault-------------- -------------------------------------30
1) Can’t work-------------------------------------------------30
2) Back lamp can’t be on----------------------------------------31
3) Image abnormity --------------------------------------------32
4) No sound--------------------------------------------------33

MST719 Service Manual
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！
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

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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. ADC and Scaling . Integration one HDMI. TAS5707 is the sound processor and Sound amplifier.
The block diagram as follow:
24C04
HDCP
DVD socket
PI5V330
DVD socket
U19
CVBS
YPbPr
YPbPr CVBS_Out CVBS
CVBS
Y / C
Audio R&L
Audio R&L
Audio Out AMP
HDMI DAC
CS4344
DVD R&L
Audio out
Audio R&L Out
TV Audio
IF
NXP
LCD Panel
Connect LIPS
Power
IR
LED
KEY Board
IR Board
Speaker
2Dinterlace
2DCombfilter
MSTAR IC
U26
U14
U10
U20
U21
U16
U27
U18
U4
U7 U8
U9
U6
U13
24C32
FLASH
EN25F40
EEPROM
CN21
RC4558
AV2&AV_OUT
Tuner
S-Video YPbPr&AV1 HDMI VGA
VGA_Auido
Headphone_Out
U28
SN74LVC1GX04DCK
X2
X1
CN8
CN10
BG/DK
PAL/SECAM
VGA_AI
HP
processor&AMP
Sound
Audio switch
DVD switch
Audio switch
K9656M30
74HC4052D74HC4052D
MST719DU
K3953M30
CVSB
TDA9885TS ADC
PCM1808 TAS5707
24C04
2 X 5W
24C04

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2.MST719 IC Introduction
1)．features description

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2) Pins function description

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3. TAS5707 IC Introduction
1)Featuresdescription

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2). Pins function description

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4. TDA9885 IC Introduction
1)features description

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Block diagram:

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