Dvd Portatil Daewoo Dpc 7400

8/14/2019 Dvd Portatil Daewoo Dpc 7400

1/34

Service Manual

Portable DVD Player

Model: DPC-7400 Series

S/ M No. : OSPC740001

May. 2005

Caution

: In this Manual, some parts can be changed for improving,

their performance without notice in the parts list.


2/34

Revision Record

Date Rev No Section Description

17/Oct./ 2005 0.1 New edition

Design and specifications are subject to change without notice. All trademarks used in the specifications are the property of their respective owners.


3/34

1. Gen er al Descr ip t io n s

1.1. Model Features.

1.2. Information

2. Elect r ical Ch ar act er ist ics

2.1. Optical Characteristics

2.2. Electrical Characteristics..

2.3. System Block Diagram.

3 . Pow er .3.1. Power Supply.

3.2. Rechargeable Battery. .

4. Dim ensi on & Phy sical Char act er is t ics.

4.1. Outline Dimension.

4.2. Physical Characteristics..

4.3. Exploded View

5. Regu lat or y Sta n da r ds.. 5.1. Safety..

5.2. EMI.

5.3. Ergonomics.

6. Ser vi ce Tools and Equi pm ent .

6.1. Service Tools and Equipment ..

6.2. Storing and Handling Test Discs..

6.3. Notes..

7 . Spar e Par t s.

7.1. key Parts List..

8. Tro u bl e sh oo t in g

8.1. Error Code Table ..

8.2. Debug & Trouble Shooting ..

1

1

2

3

3

3

4

1 1

11

11

1 3

13

13

14

1 5

15

15

15

1 6

16

16

17

1 9

19

2 0

20

21


4/34

- 1 -

1 General Descriptions1.1 Model Features

Video: DVD Playback, MPEG4(option) ,DivX(DivX Model),Kodak Picture CD compatible& JPEG readable

Audio: CD, CD-R, CD-RW, MP3, WMA Playback

Firmware Upgradable

Dolby Digital Output 7" active-matrix TFT screen, 16:9 wide aspect ratio Composite Video Output Ultra dimension & light weight: 200mm(L) x 155mm(W) x 38mm(H) / 900g (around) Slim size wireless remote control Rechargeable battery pack 12-volt car cigarette lighter cable Universal AC/DC power adapter Audio/video cable for TV connection Built-in stereo speakers

Two Stereo headphone jack

Parental Lock Anti Shock Protection


5/34

- 2 -

1.2 Information

Disk Format DVD, VCD, CD, MP3, CD-R, CD-RW, MPEG4 (OPTION),JPEG,

Kodak Picture CD, DivX(DivX Model),WMA

Video System NTSC / PAL/Auto

Video Decompression MPEG-2 (ISO/IEC-13818), MPEG-1

Video Output 800~1200mVpp/75 ohm

Audio Characteristic 2-Channel Analog

Analog Output 1.0~2.0Vrms/10K ohm

Frequency Response DVD: 48kHz Sampling: 20Hz-20kHz

CD: 20Hz-20kHz

S/N Ratio


6/34

- 3 -

2 Electrical Characteristics2.1 Optical Characteristics

Parameter Specifications Unit

Screen Size 7.0 (16:9 diagonal) inch

Display Format 1400 (H) 234 (V) dot

Active Area 154.08 (H) 86.08 (V) mm

Dot Pitch 0.107 (H) 0.370 (V) mm

Pixel Configuration StripeOutline Dimension 166.0 (W) 100.0 (H) 7.2 (D)(typ.) mm

Surface Treatment Anti-Glare and Hard Coating

Weight 180 10 g

2.2 Electrical Characteristics

DVD/ SVCD/ VCD/ CD system decoding, packeted element streams and audio, video elementstreams.

Fully digital servo processing (focusing, tracking, sledge and spindle servo control) Fully digital calibration (focusing/ tracking offset and balance) Digital phase lock loop with phase equalizer Support Audio/ Video/ Photograph decoding and programming

Programmable Y/C delay relationship

Embedded micro-controller, up to 50MHz operating frequency 1.8V and 3.3V dual power supply, 208 pin PQFP


7/34

- 4 -

2.3 System Block Diagram

2.3.1. The System Block Diagram & the Block's Function Description

DC To DC

MP1580

1. Loader

DM-520A

2. Servo +MPEG

MT1389D/MT1389C

DISPLAY

7 TFT LCD

PW070XU3

INVERTER

TFT LCD Driver

IR3Y29B +HX8806


8/34

- 5 -

2.3.2 Schematic Circuit Diagram

( 1 ) P O W E R _ M P S

1

DELETA

9VIN

+3.3V +

5V

NCTR_5V

CTR_5V

LDO_AV33

RFV33

NCTR

_5V

9VIN

+5V

+3.3V

CTR_5V

NCTR_5V

+3.3V

RFV33

+3.3V

LDO_AV33

RM4

39K

QM1

OPEN/3904

1

2 3

UM1

MPS1580

1234

8765

BSVinVsw

GND

Sync

EN

CompFB

CM7

220uF/6.3V/LU

D1LED1

1

3

2

C135

2

2uF

C410

uF

UM2

MPS1580

1234

8765

BS

Vin

Vsw

GND

Sync

EN

CompFB

LM4

6.8uH

RM7

OPEN

R13

30O

+

C120

22

0uF/6.3V/lu

RM3

30.9K

RM12

OPEN/10K

CB59

0.1uF

RM11

4.7K/open

+

C121

22

0uF/6.3V/lu

L26

FB

RM110K1%

R156

4.7k/open

CB60

0.1uF

RM10

10K

RM8

16.9K

L27

FB

RM9

OPEN

RM2

33R

Q1

3904

1

2 3

CM3

0.022uF

CM1

0.01uF

CM5

100pF

CM10

100pF C

M9

0.022uF

CM8

0.01uF

RM610K1%

LM2

6.8uH

RM5

10K

C136

22uF

C119

10uF

DM1

DIODE

1 2

CM2

100uF/10V/LU

DM2

DIODE

1 2

LM122

uH

LM322

uH

R2

330O


9/34

- 6 -

(2) POWER FOR TFT

1

11

1

1

-10V_TFT

+15V_TFT

+7.5V_TFT

VSYNC#

POWDET_MCU

+3.3V_TFT

+5V_TFT

+5V_TRAN

VIN

+3.3V

+5V

V18

+3.3V_TFT

+

5V_TRAN

9VIN

VOUT

9VIN

CTR_LOAD

CTR_AUDIO

POWDET_MPEG

CTR_TFT5V

POWDET_MCU

+5V_TRAN

HSYNC#

VCC

+5V_TFT

+7.5V_TFT

+3.3V_TFT

-10V_TFT

VCC

+15V_TFT

+3.3V

V18

+3.3V

+5V

9VIN

POWDET_MCU

POWDET_MPEG

CTR_LOA

D

CTR_AUD

IO

POWDE

T_MCU

POWDE

T_MPEG

CTR_TFT5V

+5V_TRAN

CTR_TFT

5V

+3.3V

+5V

+7.5V_TFT

+5V_TRAN

-10V_TFT

+

15V_TFT

+3.3V

+3.3V

+3.3V

+

C13

47uF/25V/LU

C15

0.1uF

C118

0.1uF

+ -

U3A

LM393

3 2

1

84

C7

100uF/10V/LU

R3

10k(8.2K)

R8

0(1.8K)

R9

3.9K

L2

20uH

Q2

BSH1051

32

C1

100uF/6.3V/LU

R15

1.6M

U1

RT9167A-185CS

1 2

34

5

6

7

8

SHDN-

IN

OUT

BP

GND

GND

GND

GND

R6

3.3K

R18

560K

C18

0.1uF

+ -

U3B

LM393

5 6

7

84

C

17

1

000pF

D

4

1

N5819

1

2

L1

20uH

Q18

OPEN/3904

1

2 3

C2

0.1uF

C11

22uF/25V/LU

J1

POWERJACK 132

C5

0.01uF

R11

20K

R158

330O

C10

47uF/25V/LU

CON1

BATTERY 21 3 4

VIN

GND

OUT

PDET

R5

3K

+

C9

47uF/25V/LU

U6

BA05SFP

45

3

21

6 VOUT

NC

GND

VIN

CTL

GND

R7

3K

+

C16

100uF/16V/LU

R157

OPEN/10K

D2

RB053L-30

1

2

R159

4.7K/open

R13

20K

R160

4.7k/open

C3

47uF/25V/LU

D3

1N5819

1

2

C6

100uF/6.3V/LU

R12

220R

C12

0.1uF

U22

RT9262

1

2

3 4

5

6

7

8

GND EXT

LFB

LDOO

FB

VDD

LX

CE

R4

47K

U5

TER9.5*100M

1

3

6

5

7

8

1

3

6

5

7

8

R16

0R

R10

47K

R14

1M

R17

200K

D

5

1

N5819

1

2

C14

0.1uF


10/34


11/34

- 8 -

(4) SDRAM&FLASH&EEPROM

TSOP4

8

pin

IIC D

RAM

FLASH

16Mb

32Mb

8M1

6M

32MFLA

SH

delete

DQ[0..1

5]

AD

[0..7

]

BA

[0..1

]

DQM

[0..1

]

MA

[0..11

]

A[0..21

]

A9

A3

AD

3

A1

A1

9

A4

AD

6

AD1

A17

A1

6

A1

3

A14

AD

0

A2

A6

A8

A1

8

AD7

A7

AD

5

A12

A1

5

A1

0

AD2

AD4

A11

A5

A0

RA

S#

PCE

#CA

S#

PRD

#D

CKE

SDA DC

LK

SCL

PWR

#

CS#

WE

#

DCS#

DCA

S#

DRA

S#

DWE

#

WE

#

RA

S#

CS#

CA

S#

BA

0

DCKE

BA1

DCLK

SD

CKE

DBA

0

DBA1

SD

CLK

A2

0

AA2

0

PCE

#

PRD

#

PWR

# AA2

0

AA21

SCL

SDA

VCC DV

33

DQ9

MA7

MA

3

MA

9

DCS#

DQ0

DQ12

MA

8

MA4

MA

0

DWE

#

DQ11

DQM

0

DQ4

DQ1

3

DBA

0

MA

5

DQ1

DCA

S#

DQ5

MA2

DQ6

DQ8

DQ14

DQ1

5

SD

CKE

DQ7

DQ2

MA1

MA1

0

DQM1

DQ3

SD

CLK

DRA

S#

MA

6

DQ1

0DQ0

MA

6

DCA

S#

DQ5

SD

CLK

DQ1

0

DRA

S#

DBA

0

DWE

#

DQ1

MA

9

MA4

DBA1

DQ7

MA1

MA2

DQM

0

DQM1

MA1

0

DQ6

DQ11

DQ1

5

MA7

DCS#

DQ1

3

DQ8

SD

CKE

DQ4

DQ14

DQ2

DQ3

MA

3

MA

5

MA

0

DQ9

MA

8

MA11

DQ12

AA21

A21

DQ6

SD

CKE

DQ1

DQ1

5

DQ9

DQM

0

MA

5

DBA

0

DQ0

DQ1

0

DQM1

DCA

S#

DQ11

DQ8

MA4

DQ14

MA

8

DRA

S#

DWE

#

DQ3

DBA1

DQ7

GND

MA2

DQ2

MA7

MA1

SD

33

MA

3

DQ1

3

SD

CLK

DQ5

DQ12

MA

6

MA

0

MA

9

MA1

0

DQ4

SDA

[2

]

DQM

[0..1

]

[2

]

BA

[0..1

]

[2

]

WE

#

[2

]

PCE

#

[2

]

CA

S#

[2

]

AD

[0..7

]

[2

]

CS#

[2

]

DCKE

[2

]

PRD

#

[2

]

SCL

[2

]

DCLK

[2

]

PWR

#

[2

]

MA

[0..11

]

[2

]

DQ[0..1

5]

[2

]

RA

S#

[2

]

A[0..21

]

[2

]

VCC

[1

]

GND

[1

,2,3,4,5]

DV

33

[1

]

SD

33

D

V33

SD

33

SD

33

SD

33

FLA

SH

_V

CC

FLA

SH

_V

CC

FLA

SH

_V

CC

SD

33

V

CC

FLA

SH

_V

CC

DV3

3

SD

33

SD

33

SD

33

SD

33

SD

33

SD

33

R68

680

CB

38

0.1

uF

L2

3

FB

CB

52

0.1

uF

CB42

0.1

uF

R64

33

CB4

5

0.1

uF

L24

NO_USE

R66

33

CB

50

0.1

uF

R2

54

680

U8ES

MTM12L1

61

61A-7 1 234 567 891

011

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

VCC

DQ0

DQ1

VSSQ

DQ2

DQ3

VCCQ

DQ4

DQ5

VSSQ

DQ6

DQ7

VCCQ

DQML

WE

CA

S

RA

S

CS

BA

/A11

A1

0

A0

A1

A2

A3

VCC

VSS

A4

A5

A6

A7

A8

A9

NC

CKE

CLK

DQMH

NC

VCCQ

DQ8

DQ9

VSSQ

DQ1

0

DQ11

VCCQ

DQ12

DQ1

3

VSSQ

DQ14

DQ1

5

VSS

CB

54

0.1

uF

CB

37

0.1

uF

CB41

0.1

uF

U9ES

MTM12L

641

64A

/N.C

TSOP

54

1 2412

579 810

46

11

13

15

16

17

18

19

35

22

23

24

25

26

14

41

29

30

31

32

33

34

36

37

38

39

40

43

42

44

52

45

47

49

48

50

51

53

54

20

21

36 27

28

VCC

DQ0

DQ1

VSSQ

DQ2

DQ3

VCCQ

DQ4

DQ5

VSSQ

DQ6

DQ7

DQML

WE

CA

S

RA

S

CS

A11

A1

0/AP

A0

A1

A2

A3

VCC

VSS

A4

A5

A6

A7

A8

A9

NC

CKE

CLK

DQMH

NC

VCCQ

DQ8

DQ9

VSSQ

DQ1

0

DQ11

VCCQ

DQ12

DQ1

3

DQ14

DQ1

5

VSS

BA

0/A1

3

BA1

/A12

VCCQ

VSSQ

VCC

VSS

R67

10k

CB4

9

0.1

uF

RN1

33x4

1

2

3

4

5

6

7

8

+

CE2

3

22

0uF

/16V

CB4

8

0.1

uF

R62

R

CB

36

0.1

uF

+

CE22

22

0uF

/16V

CB4

0

0.1

uF

U12

EEPR

OM24

C1

6

SOP-8

1234

5 6 7 8

NC

NC

NC

GND

SDA

SCL

WP

VCC

CB44

0.1

uF

CB

53

0.1

uF

CB47

0.1

uF

U7ES

MTM12L1

61

61A-7 1 234 567 891

011

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

VCC

DQ0

DQ1

VSSQ

DQ2

DQ3

VCCQ

DQ4

DQ5

VSSQ

DQ6

DQ7

VCCQ

DQML

WE

CA

S

RA

S

CS

BA

/A11

A1

0

A0

A1

A2

A3

VCC

VSS

A4

A5

A6

A7

A8

A9

NC

CKE

CLK

DQMH

NC

VCCQ

DQ8

DQ9

VSSQ

DQ1

0

DQ11

VCCQ

DQ12

DQ1

3

VSSQ

DQ14

DQ1

5

VSS

L2

5

FB

CB

51

0.1

uF

CB

39

0.1

uF

U11

STM2

9W1

60/MX2

9LV

800(160)

25

24

23

22

21

20

19

188

10

28

47

16

29

31

33

35

72

6

38

40

42

44

30

32

14

36

39

41

43

45

37

27

11 9

34

46

64 53214

817

12

A0

A1

A2

A3

A4

A5

A6

A7

A8

A2

0

OE

BYTE

A1

8

D0

D1

D2

D3

A9

CE

D4

D5

D6

D7

D8

D9

WP

/ACC

D11

D12

D1

3

D14

D1

5

VCC

GND1

WE

A1

9

D1

0

GND2

A1

0

A12

A11

A1

3

A14

A1

5

A1

6

A17

RE

SET

R7

0

10k

CB4

3

0.1

uF

+

CE24

47

uF

/16V

CB4

6

0.1

uF

R65

33

R63

33

R61

R

+

CE2

5

47

uF

/16V


12/34

- 9 -

(5) VIDEO OUTPUT

1

1

TFTI/O

2N3904

3

C

E

2

B

1

TFT

_CVB

S

-10V

_TFT

9VIN

+3.3V

_TFT

+7.5V

_TFT

+1

5V

_TFT

+5V

_TFT

ASPDIF

Y[3

..6]

CVB

S_TFT

VIDE

O_TV

INT

/EXT

P/N

ASPDIF

+5V

_TRAN

TFT

_OUT

TFT

_CVB

S

SVIDE

O_Y

SVIDE

O_C

SCALE

VIDE

O_TV

TFT

_OUT

CVB

S_TFT

CVB

S_OUT

P/N

SCALE

+5V

_TRAN

+5V

_TFT

+5V

Y3

Y

4Y

5

CVB

S_OUT

Y

6

CVB

S_OUT

+1

5V

_TFT

9VIN

+5V

_TFT

-10V

_TFT

+7.5V

_TFT

+3.3V

_TFT

ASPDIF

Y[3

..6]

INT

/EXT

P/NSC

ALE

TFT

_OUT

CVB

S_TFT

CVB

S_OUT

+5V

_TRAN

+5V

_TFT

+5V

+5V

+5V

F2

FB

C1

32

330

pF

F1

FB

C1

31

0.1

uF

F4

FB

F5

FB

F6

FB

F7

FB

F8

FB

F9

FB

R1

54

100R

F11

FB

F12

FB

L22

1.8

uH

L4

30

L1

8

1.8

uH

R14

6

150R

C4

3

47

pF

L4

5

1.8

uH

R14

9

150R

C44

47

pF

L44

0

J1

0

VIDE

O

/COAXIAL

5 4 2 3 1

GN

D

GN

D

VID

EO

CO

AXIAL

VID

EO

C12

9

OPEN

C4

6

27

0p

F

C1

30

330

pF-OPEN

C4

5

27

0p

F

F1

0

FB

CON4

109874321 5 6

11

12

13

VIDE

O

NT

SC/PAL

GND

-10V

_TFT

+5V

_TFT

+7.5V

_TFT

+1

5V

_TFT

HV

GND

+3.3V

+9VP

OWER

VGND

MODE

SCALE

C51

47

pF

R1

51

150R

C124

330

pF-OPEN

Q17

3904

1

2 3

F3

FB

C4

8

47

pF

C12

8

47

pF

R1

50

4.7K

R1

52

75R

C122

47

pF

C4

9

47

pF

R14

8

4.7K

L21

1.8

uH

Q1

6

3904

1

2 3

C11

3

47

pF

R14

5

4.7K

J7

S_VIDE

O

5 4 2 3 1

GND

GND

S_Y

S_C

S_Y

L1

9

2.7

uH

L2

0

2.7

uH

R147

4.7K

C1

33

27

0p

F

+

C12

6

330uF

/6.3V

C12

3

OPEN

C1

34

47

0p

F

C127

0.1

uF

F1

3

FB

R

153

100R


13/34


14/34

- 11 -

3 Power

3.1 Power Supply

Input voltage:Normal voltage: 100 to 240 Vac.

Variation range: 90 to 264 Vac.

Input frequency:Normal frequency: 50 to 60 Hz.Variation range: 47 to 63 Hz.

Input current: 0.6 arms max. at any input voltage and max. DC output rated load. Inrush current: 70 amps max. cold start at 240 Vaz. Input, with rated load and 25 ambient. AC leakage current: 0.25 mA max. at 240 Vac. Input.

3.2 Rechargeable Battery

Output Voltage8.4~6.0V Cut-off Voltage5.7~6.0V Charge voltageThe battery pack should be charged when the input voltage is from11V to 15V Chargera.) Hiteker DC12V/2.7A adaptor.

b.)Hiteker DC12V/2.7A adaptor and Portable DVD LED is in red color when the battery pack is in charging; and turns into green color when

batter pack is full. If the battery pack is in Full status, no matter use adaptor charge directly or link DVD to

charge again, the LED must be turn into green color in 15 min.

The cycle life of battery pack has more than 300 cycles. Charge: The battery pack must be able to charge when used the Hiteker DC12V/2.7A adaptor or

Hiteker DC12V/2.7A adaptor and portable DVD (power off status).

Discharge: Using the battery pack as the power source for portable DVD that in DVD discplaying mode, the discharging time must be exceed 2.5hrs.

3.2.1 Electrical Protection

The battery pack shall be capable of withstanding a continuous short circuit output without damage.


15/34

- 12 -

The battery pack shall return to normal operation only after the fault has been removed. A thermal fuse must be added on the surface of cell body to protect the battery pack. A polyswitch must be add to protect the battery pack. Charge & Play Time of Battery Pack

Charge Time

(hr)

DVD Title

Play Time (hr)

Styling

Ni-MH2400mAh

(6S1P)4~5 2.5

For DPC-7400 Series


16/34

- 13 -

4 Dimension & Physical Characteristics

4.1 Outline Dimension

200mm(L) x 155mm(W) x 38mm(H)

4.2 Physical Characteristics


17/34

Drawn:

NO

- 14 -

4.3 Exploded View


18/34

- 15 -

5 RegulatoryStandards

5.1 Safety

UL FDA

5.2 EMI

CE FCC

5.3 Ergonomics

Dolby

LVD


19/34

- 16 -

6Service Tools and Equipment

6.1Service Tools and Equipment Table

Application Name

DVD Testing DiscGeneral

General Tools screwdriver etc.

CD Testing DiscConfirm

VCD Testing Disc

Oscillograph

Probes

AV Cables

Adjust

TV Monitor

Searing-iron

Antistatic wrist strapGrounding for electrostatic breakdown

Conductive material steel sheet

6.2 Storing and Handling Test Discs

It is important for a DVD testing disc keeping its surface precise. Please

care for storing and using it.

1. Do not place the disc on worktable directly after using.2. Do not store discs in places subject to direct sunlight or near heat sources.


20/34

3. Do not place the disc on a glass surface. It may damage the disc. If this happened,please use a new testing disc adjust DVD player precision.

6.3 Notes

PLEASE READ ALL NOTES GIVEN IN THIS MANUAL.

Locate Place the unit on a firm, flat surface. Do not place in a high temperature (upwards of 40 ) or high wet (upwards of 80 percent) area.

Do not place in an area with a lot of dust. Keep away from direct sunlight &domestic heating equipment. Do not fall any objects into the unit. Care should be taken so that liquids are not spilled into the unit openings.

Such situations could result in fire or electrical shock.

Keep the DVD video player away from any magnetic articles such as speaker etc.

Superposition Please place the DVD player horizontally. Do not place a heavy object

(amplifier, receiver) on it. The object may fall, causing serious personal injury

- 17 -


21/34

- 18 -

or death.

This unit should be situated away from heat source, such as amplifiers, radiators,stoves or any other units producing heat.

CondensationLens could be moistening in these cases.

Turn on heater shortly, In a very wet room, Move the player from a cold environment to a heat environment quickly.

Being moisture inside the play could operate normally. Please turn on power and

wait about an hour for drying the moisture.


22/34


23/34


24/34

- 21 -

T33 MP3 abnormal sound

T34 Audio no waveform (sound) or waveform (sound) abnormal

Earphone Test

T41 Earphone no sound or the sound has pause, abnormal sound, noise, echo

T42 Earphone (right) no sound or the sound has pause, abnormal sound, noise

T43 Earphone (left) no sound or the sound has pause, abnormal sound, noise

Function Key Test

T51 Video cant be still or stop

T52 Cant execute fast forward or rewind

T53 Panel button

System Setting Test

T61 Cant enter the system setting

T62 The system can not be played or it is down after the system is set

TFT Test

T71 TFT image and color error

T72 TFT image is black and white

T73 TFT image shakes and is distorted

T74 TFT PAL color strip

6.2 Debug & Trouble Shooting

CB for any missing components and bad soldering T01No Power

Main BoardA. Check for components on the Main Boardto see if there are any short circuits.B. Check for the power adapter to see if the 12v power is abnormal.

C. Check for components C6,C7,CE100,C3 on the Main Boardto see if there are

any short circuits.D. Check for component CN1 on the Main Board to see if the switch have function.

E. If none of the above actions is effective, please change Main Board. T02Power LED indicator not on or insufficient brightness

Main BoardA. Open the cover of the portable DVD-player to inspect if LEDfunctionsnormally.

T75 TFT ripple

B. Measure the base electrode of Q1 to see if the voltage is high_and the emitter of

Q1 must be high voltage.Q1 is a NPN 3904 type transistor. If it is abnormal ,


25/34

- 22 -

Please replace with a good one.

D. Disassemble F/W, replace with a good one or re-plug it to see if the LED lightsup when Power ON.

E. If the above actions are not working, replace the Main Board. T03Loading time too long

Main BoardA. Check the flat cable to see if it is adhibited to the right place.B. Remove the cover to see if the resistors or resistor-array adjacent to U38 and or

U17, to see if there is any cold soldering, hollow soldering, misplaced soldering,

or wrong part.

T04Remote control bad sensing or sensing not functional Remote control

C. If the above actions are not working, replace the Main Board.

A. If the main body of the system works normally, then making sure that the

battery of the Remote control has sufficient power, if it is not, replace the battery.

Main BoardA. Remove the top cover and the panel. Check to see ifIR1 has short circuit,

broken circuit, hollow soldering, or other problems. Also check if the pins 1 of

IR1 have power.B. If the above actions are not working, replace the Main Board.

T05Stay in the Run In condition after power on, cant be tested Main Board

A. The same refer to T03.B. If the above actions are not working, replace the Main Board.

T06System down at power on Main Board

A. Remove the top cover, check all flat cables in the system to see if they are correctlyplugged to the fixed positions, or re-plug them.

B. Check the pin 1 of U3 to see if it is low voltage. If not , disassemble R5 or pull it tolow voltage with a lead.

C. If the above actions are not working, replace the Main Board. T07System down during play

Main BoardA. Exclude the condition of using battry. (The system will down when the

voltage is too low.)

B. Disassemble U17 F/W, replace with a good one or re-plug it to see if thesymptom will disappear.


26/34

- 23 -

C. Remove the top cover, check all flat cables in the system to see if they arecorrectly plugged to the fixed positions, or re-plug them.

D. Check the capacitors C19 and the diode D6 to see if the reset circuit works normally.

E. If the above actions are not working, replace the Main Board. DVD ROM

A. Check the loader to see if it is not stable (any condition that some of the discscant be played). If so, replace the loader.

DVD DISCA. Check the Test Disc to see if there is any serious scratch or ring shape, circular

shape scratches, if so, replace the Test Disc and test again.

T08Power on unstable Main Board

A. Remove the top cover, check all flat cables in the system to see if they arecorrectly plugged to the fixed positions, or re-plug them.

B. Check the LDO Q3 to see if it works normally with a 1.8V output voltage.C. Check the reset circuit refer to the title T07-D.

D. If the above actions are not working, replace the Main Board. T09Abnormal sound in the machine base (Power on abnormal sound)

DVD ROMA. Check the loader to see if it is the source of the abnormal sound. If so, replace the loader.B. If the abnormal sound comes from the audio speakers, check the audion PNP3906

T11Disc drive cant read (NO DISC) Main Board

A. Remove the top cover, check the 28-pin flat cable in the system to see if theyare correctly plugged to the fixed positions, or re-plug them.

B. Check the resistors or resistor-array adjacent to U38 and U17 to see if there isany hollow soldering or cold soldering.

type Q16 and NPN 3904 type Q8/9/10/12/13/15 to confirm the mute circuit works

normally. If not ,change the audion.

C. If the above actions are not working, replace the Main Board. If it is still notworking, replace the loader.

DVD ROMA. Check the loader to see if it cant read. If so, replace the loader.

T12Disc drive no action or locked Main Board

A. Remove the cover. Check to see if it is caused by mis-assembly.B. Check the resistors or capacitors adjacent to U38 to see if there is any hollow

soldering or cold soldering.

C. If the above actions are not working, replace the loader. If it is still not working,


27/34

- 24 -

replace the main board.

T13Disc drive scratches disc Main Board

A.

Check the resistors or capacitors adjacent to IC(U17) to see if there is any hollowsoldering, cold soldering, wrong part, or misplaced soldering.

B. If the above actions are not working, replace the loader. If it is still not working,replace the main board.

DVD ROMA. Check the loader to see if it is the cause of disc scratching. If so, replace the

loader.

T14Not every disc can be played Main Board

A. Check the resistors or capacitors adjacent to IC(U17) to see if there is any hollowsoldering, cold soldering, wrong part, or misplaced soldering.

B. If the above actions are not working, replace the loader. If it is still not working,replace the main board.

T15Head does not work Main Board

A.

Remove the top cover, check the 28-pin flat cable and the 2-pin cable in thesystem to see if they are correctly plugged to the fixed positions, or re-plug them.

B. Check the resistors or capacitors adjacent to IC(U17) to see if there is any hollowsoldering, cold soldering, wrong part, or misplaced soldering.

C. If the above actions are not working, replace the loader. If it is still not working,replace the main board.

T16Spindle does not work. Main Board

A. Remove the top cover, check the 4-pin flat cable in the system to see if theyare correctly plugged to the fixed positions, or re-plug them.

B. Check the resistors or capacitors adjacent to IC(U17) to see if there is any hollowsoldering, cold soldering, wrong part, or misplaced soldering.

C. If the above actions are not working, replace the loader. If it is still not working,replace the main board.

T21no video / abnormal Main Board

A. Remove the top cover, check all flat cables in the system to see if they are


28/34

- 25 -

correctly plugged to the fixed positions, or re-plug them.

B. Use oscilloscope to measure if Y1 generates 27MHz. If it does not generatesaid frequency, and the problems such as cold or hollow soldering have been

ruled out, it maybe Y1 work abnormally . Replace Y1 with a 27MHzfundamental frequency oscillater.

C. Check if U17(F/W) IC has any problem.D. Check if switch for TFT on/offis normal; replace a new one if necessary.E. If the above actions are not working, replace the Main Board.

Driver Board

B. Adjust VR4,VR6,VR1,VR7,VR5 to the appropriate value.A. Check VR6,VR4,VR1,VR7,VR5 is using the correct component. Also check if

its damaged.

DVD ROM (less likely to happen)A. If it is useless to change the main board, then replace the loader.

T22Video no video / abnormal Main Board

A. Remove the cover. Check the main board to see if there is any cold or hollowsoldering and rule out the problem.

B. Remove the top cover, check all flat cables in the system to see if they arecorrectly plugged to the fixed positions, or re-plug them.

C. Check RLC following CVBS to see if there is any wrong parts, cold and hollowsoldering, short circuit, broken circuit, broken parts and rule out the problem.

D. If the above actions do not work, then check U17Pin175 and Pin182 to see ifthere is CVBS signals.

E. If the above actions are not working, replace the Main Board.

T23S-Video no video / abnormal or black & white Main Board

A. Remove the cover. Check the main board to see if there is any cold or hollowsoldering and rule out the problem.

B. Remove the top cover, check all flat cables in the system to see if they arecorrectly plugged to the fixed positions, or re-plug them.

C. Check RLC following Y and C to see if there is any wrong parts, cold andhollow soldering, short circuit, broken circuit, broken parts and rule out the

problem.


29/34

- 26 -

D. If the above actions do not work, then check U17 Pin179 and Pin181 to seeif there is Y and C signals.

E. If the above actions are not working, replace the Main Board.

T24VCD abnormal picture Main Board

A. Check main board to see if there is any cold or hollow soldering and shortcircuit problem and rule out the problem.

B. Check the resistors or capacitors components or those adjacent to IC to seeif there is any hollow soldering, cold soldering, wrong part, or misplaced soldering.

C. If the above actions are not working, replace the Main Board. DVD ROM

A. If the abnormal picture is the problem of pause or skipping tracks, then makingsure if the disc has any scratches or dirt, if no such problems then replace the

loader.

T25DVD abnormal picture Main Board

A. Check U17 to see if there is any cold or hollow soldering and short circuitproblem and rule out the problem.

B. Check the resistors or capacitors components or those adjacent to IC to seeif there is any hollow soldering, cold soldering, wrong part, or misplaced soldering.

C. If the above actions are not working, replace the Main Board. DVD ROM

A. If the abnormal picture is the problem of pause or skipping tracks, then makingsure if the disc has any scratches or dirt, if no such problems then replace the

loader.

T26Picture subtitle abnormal display or no display Main Board

A. Remove the top cover and dis-assemble F/W (U17). Replace it with a goodF/W or re-plug it, then check if the action is normal. Otherwise replace the F/W.

B. Check U17 to see if there is any cold or hollow soldering and short circuitproblem and rule out the problem.

C. If the above actions are not working, replace the Main Board. T27Setting menu abnormal picture

Main BoardA. Check U17 to see if there is any cold or hollow soldering and rule out the problem.


30/34


31/34


32/34

- 29 -

Main BoardA. Check U17 to see if there is any cold or hollow soldering and reverse soldering

of IC or parts missing.

B. If the above actions do not work after the inspection, it means the main board orF/W is bad.

C. If the disk is abnormal, ask for a new version software . T62System cant play or system down after setting

Main BoardA. Check U17 to see if there is any cold or hollow soldering and reverse soldering

of IC or parts missing.

B. If the above actions do not work after the inspection, it means the main board orF/W is bad. Replace the main board or re-burn the F/W (U11).

T71TFT image and color error Main Board

A. Check the 11-pin cable connected to the driver board to see if there is anyproblem of plugging. Rule out the problem.

B. Check devices after Y/C signal to see if there is any cold or hollow solderingand reverse soldering of IC or parts missing.

C. Check U17 to see if there is any cold or hollow soldering and reverse solderingof IC or parts missing.

D.

If the above actions are not working, replace the Main Board. Driver Board

A. Measure the voltages ofVGH,VGE,VCC,VDD,VIN and VSS to see if they arecorrect.

B. Check VC1 to see if there is any cold or hollow soldering and reverse solderingof IC or parts missing.

C. CheckY1,Y2 to see if there is any cold or hollow soldering and reverse solderingof IC or parts missing.

D. If the above actions are not working, replace the Driver Board. T72TFT image is black and white

Main BoardA. Check the 11-pin cable connected to the driver board to see if there is any

problem of plugging. Rule out the problem.

B. Check devices after Y/C signal to see if there is any cold or hollow solderingand reverse soldering of IC or parts missing.


D. If the above actions are not working, replace the Main Board. Driver Board


33/34

- 30 -

A. Measure the voltages of VGH,VGE,VCC,VDD,VIN and VSS to see if they arecorrect.


C. Check the devices surrounding U1 and U201 to see if there is any cold or hollowsoldering and reverse soldering of IC or parts missing.

D. CheckY1,Y2 to see if there is any cold or hollow soldering and reverse solderingof IC or parts missing.

E. If the above actions are not working, replace the Driver Board. T73TFT image shakes or is distorted

Main BoardA. Check the 11-pin cable connected to the driver board to see if there is any

problem of plugging. Rule out the problem.B. Check devices after Y/C signal to see if there is any cold or hollow soldering

and reverse soldering of IC or parts missing.


D. If the above actions are not working, replace the Main Board. Driver Board

A. Measure the voltages of VGH,VGE,VCC,VDD,VIN and VSS to see if they arecorrect.



D. CheckY1,Y2 to see if there is any cold or hollow soldering and reverse solderingof IC or parts missing.

E. If the above actions are not working, replace the Driver Board. T74TFT PAL color strip

Driver BoardA. Measure the voltages of VGH,VGE,VCC,VDD,VIN and VSS to see if they are

correct.



D. CheckY1,Y2 to see if there is any cold or hollow soldering and reverse soldering


34/34

Documents

Dvd Portatil Daewoo Dpc 7400