Prology MDD-722T Service manual

SERVICE MANUAL

V1.0

SPECIFICATION

MDD-722T

Power requirement 12 V DC car battery (negative earth)

Dimensions Approx 165mm×178mm×50mm (W/H/D)

Operating temperature -10 ~+ć 60ć Storage temperature -30 ~ +80ćć

Operational humidity 45%~80%RH

Atmosphere pressure 860mbar~1060mbar

TABLE OF CONTENTS

1.SERVICEGUIDE____________________________________1-4

2. EXPLODING DRAWING ____________________________ 5-11

3. SCH DESIGN ____________________________________12-28

4. BOM____________________________________________29-44

CAR DVD PLAYER

The Service Guide of MDD-722T

1. The Unit can not be powered on.

1) Check whether there is a fuse in the filter box of power line or whether the fuse

has been blown.

2) If the unit can not be powered on yet, change the power line.

3) If the unit still can not be powered on, you should check whether the reset button

is pushed down by the front panel.

4) If the unit can not be powered on yet after the above operation, you should

change the mainboard part.

2. No display

1) Check whether the connection of video output is right.

2) If there is no display yet, change the video output line.

3) If there is no display yet, change the mainboard part.

4) If there is no display after the above operation, you should change the video

driver board part.

3. Shut down automatically

1) Check whether the power supply is accord with the specification.

2) Check whether the fuse in the filter box of the power line has been blown.

3) Check whether the ACC is connected to the high level (The ACC is connected to

the battery generally).

4) If the trouble is still not solved yet, check the connection between the front panel

and the mainboard. If necessary, change the connector.

5) If the unit shuts down automatically yet after the above operation, you should

change the mainboard part.

4. No audio output

1) Check whether the MUTE key is pressed.

2) Check whether the Fast Forward key or the Fast backward key is pressed.

3) Check whether now playing has audio.

4) Change the audio output line.

5) If there is no audio output yet, change the mainboard part.

6) If the trouble is not solved yet after the above operation, change the loader part.

5. AUX-IN function failure

1) Check whether the AUX-IN input line is available.

2) If the AUX-IN function is viod yet, change the mainboard part.

6. TV/NAVI function failure

1) Check whether the connection is right.

2) the TV/NAVI function is viod yet, change the mainboard part.

7. The fan can not work normally.

1) Check whether the power supply is turned on.

2) Check whether the power socket of the fan is connected firmly.

3) Chang a good fan.

4) If the fan can not turn yet after the above operation, chang the mainboard.

8. The color of TFT is abnormal

1) Check whether the video output of rear zone is normal.

2) If the video output of rear zone is normal, that is to say the decode works

normally, and you should check the connection between the mainboard and the

TFT unit.

3) If the video output of rear zone is abnormal, change the mainboard part.

4) If the color of TFT is abnormal yet after the above operation, change the video

driver board part.

9. White screen

1) Check the connection between the loader and the mainboard, the mainboard

and the power supply board of TFT, the power supply board of TFT and the TFT.

2) If the trouble is still not solved, change the power supply board of TFT.

3) If the trouble is still not solved after the above operation, change the Display

part.

10. Black screen(No display in the TFT)

1) Check the connection between the loader and the mainboard, the mainboard

and the power supply board of TFT, the power supply board of TFT and the TFT.

2) Check whether the background lights are illumed. If not, change the CCFL

board.

3) If there is no display in the TFT, change the display part.

4) If there is still no display in the TFT after the above operation, change the

mainboard part.

11. Blue screen

1) Check whether the video output of rear zone is normal.

2) Check whether the source can normally change. And have sound output

3) If yes,check the reverse detect line.

4) If not, change the mainboard part.

5) If not yet, change the video driver board part.

12. The icon of MUTE displays in the TFT at all times

1) Check whether there is any audio output.

2) If the audio output is normal, change the mainboard part. If the trouble is still not

solved, change the display part.

3) If the audio output is abnormal, change the mainboard part. If the trouble is still

not solved, change the loader part.

13. Beeper function failure

1) Check whether the beeper has turn off in the setup option.

2) Change the beeper.

3) If the trouble is not solved yet, change the mainboard part.

14. Key function failure

1) Check whether the key in the front panel is available.

2) Check the connection between the front panel and the mainboard. If necessary,

change the FFC connector.

3) If the key in the front panel is void, change the front panel part.

15. Remote controller function failure

1) Check whether the key in the front panel is valid.

2) If the key in the front panel is valid,that is to say the mainboard works normally.

Check whether the battery of the remote controller is available or change

another one good.

3) If the key in the front panel is viod, you should check the connection between the

front panel and the mainboard. If necessary, change the FFC conector.

4) If the trouble is still not solved yet, change the front panel.

5) If the trouble is still not solved yet, change the mainboard part.

16. No display in the LCD

1) Make sure the TFT unit is colsed.

2) If there is no display in the LCD also, you should change the LCD board.

17. Display in the LCD is abnormal

1) Check the connection between the mainboard and keypad .

2) If the display of LCD is abnormal, you should change the LCD board.

18. No volume display in the TFT

1) Check whether the volume knob is available.

2) Check whether there is volume display in the TFT using the remoter controller to

adjust the volume.

3) If there is volume display in the TFT using the remoter controller to adjust the

volume, that is to say the display part and the mainboard part work normally, you

should change the front panel part.

4) If there is no volume display in the TFT using the remoter controller to adjust the

volume, change the mainboard part.

5) If the trouble is still not solved yet, change the display part.

19. The picture of playback is not fluent

1) Check whether the disc is dirty, scratched or deformed.

2) Check whether the lens of pick-up is dirty and clean it.

3) If the picture of playback is not fluent yet, you should change the loader part.

20. Loading failure

1) Check whether the disc you want playback is accord with the specification.

2) Check the connection between the pick-up mechanism and the servo&MPEG

board. If necessary, chang the loader part.

21. Can not insert one disc

1) Check whether there is another disc in the unit.

2) Check the connection between the loader part and the mainboard part. If

necessary, change the connector.

3) If the trouble still exists, change the loader part.

4) If the trouble is still not solved after the above operation, change the mainboard

part.

22. Can not eject the disc

1) Check the connection between the front panel and the mainboard.

2) Check the connection between the mainboard and the loader.

3) If the trouble is still not be solved, chang the loader.

4) If the trouble is still not be solved after changing the loader, change the

mainboard.

23. Eject the disc automatically

1) Check the connection between the loader and the mainboard.

2) If the trouble still exists, change the loader.

3) If the trouble is not solved yet after changing the loader, you should change the

mainboard.

P PANGSNOIT

PCB REVISION:V02

P IR

C SED

SCH REVISION:V02

SHEET: 1 / 13

DRAWN BY CHECKED BY TECHNICS BY APPROVED BY

REF NO

MARKS

345

CHANGE

MODEL NO

DESCRIPTION

CODE NO:

MDD-722T.SCH

SGN APP

DESCRIPTION

REF NO

MARKS

345

CHANGE

DISC_SENSE1

R57

10k

R491

DGND

R492

4k7

R475

S3V3

R474

D5V

RF5V

R58

2R(0805)

103

C54

DGND

RFVCC

DGND

TC55

100uF/6V3

RFVCC

2N3904

Q135

VCC1

DVD_MD

CD_MD

R79

VR_CD

R80

DGND

C53

C52

102

VR_DVD

DGND

GAIN_SW

R145

4k7

10k

R144

RF5V

DGND

Q206

2N3904

R55

DSPVCC33

RF33V

18k

100uF/6V3

R50

DGND

100uF/6V3

TC56

3906

4k7

OPEN

DVD_LD

R59

220R

Q204

2SB1132

DVD_LD

CD_LD

FB19

100R

R54

TC59

4R7

R62

2N3904

R51

4k7

CD_LD

220R

100uF/6V3

TC57

R60

Q205

2SB1132

IN4148

104 C195 104 C130

FB18

R458

510k

R451

510k

DGND

18k

R56

4R7

R61

DGND

MDD-722T

MODEL NO

PCB REVISION:V02

SCH REVISION:V02

DRAWN BY CHECKED BY TECHNICS BY APPROVED BY

SHEET: 2 / 13

FRONT END

DESCRIPTION

CODE NO:

OPU_RF

CD_DVD

OPU_C

GAIN_SW2

OPU_B

OPU_D

OPU_E

OPU_A

OPU_F

MD5V

R49 100R

H1+

H1-

H2+

H3+

H2-

H3-

H-

SLED-/LOAD-

DGND

SLED+/LOAD+

104

C155

104

C153

104

C151

104

C147

104

C143

104

C142

104

C140

49484746454443

SLED-

CN1

4039383736353433323130292827262524232221201918

H1-

H1+

H2+

VH-

H3-

H3+

H2-

VH+

DGND

RFVCC

DGND

TACT+

TR+

FACT+

FO+

TACT-

DVDLD

FACT-

VCC

FO-

TR-

RFGND

DVDLD

RFGND

SW5

SW3

SW4

SW2/SW1

VCC1

HOME_SW

VCC1

SW3

SW4

SW5

SW6

DGND

SW2/SW1

2k2

R44

CDLD

VR_DVD

VR_CD

R45

3k3

R40

1716151413121110987654321

VREF

CDLD

DVDVR

A/A

CCDVR

RFGND

F2/E4+F4

F1/E1+F1

D/D

SW2RFSW1

RFVCC

2k2

FB4 CBY601

R46

R48

2k2

104

C51

DGND

TC1

47uF/6V3

102

C67

DGND

C47

102

DGND

VCC

C/C

B/B

RFGND

E1/E2+F2

E2/E3+F3

TO S_CONNECT

CDLD

DVDLD

C90

OPU_F

33p

C89

OPU_E

33p

OPU_D

C86

33p

OPU_C

33p

C84

OPU_B

33p

C83

OPU_A

DGND

33p

C82

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