Daewoo DPC-7800 Schematic

OSDPC78001

(7 Inch) LCD Color Monitor &

DVD Player

DPC-7800NT (2708ED)

DEC. 2006

(7 Inch) LCD Color Monitor & DVD Player

MODEL : DPC-7800NT（2708ED）

CONTENTS

----------------

Specification.......................................................…...............................................…………….…..

Block Diagram...................................…................................................................…………….…..

General Alignment Instruction.......................................................................……….…….....…

2~3
4~5

6

Troubleshooting...........................................................................................…...……………...…..

Printed Circuit Board........................................................................................……………...…...

IC Block Diagram & Description.........................................................................…………..…..

Explode View........................................................................................................…………......….

Schematic Diagram.........................................................................................…………….....…..

7~8

9~13

14~31

32

33~42

SPECIFICATION

LCD

Description Condition Unit Limit Nominal

Headphone Output 1kHz 0dB mW 3±2 3

Headphone Noise No Signal mV <1mV <1mV

SPK MAX
Output(DVD)

SPK MAX Output(AV
IN)

LINE OUT Distortion 1kHz 0dB/8ohm % ≤0.3 0.3

REF THD 1kHz 0dB % 3 1

Headphone S/N Infinity zere/-dB/L&R∝ dB ≥50 ≥50

Luminance(MAX) White Signal LUX 300±50 300

Luminance(8step) White Signal LUX 250±50 250

Luminance(MIN) White Signal LUX 100±50 100

L 1kHz 0dB mW 600±100 600

R 1kHz 0dB mW 600±100 600

L 1kHz 0dB mW 600±100 600

R 1kHz 0dB mW 600±100 600

20Hz dB ±3 0

LINE OUT RESP(8ohm)

Headphone RESP

125Hz dB ±3 0

10kHz dB ±3 0

20kHz dB ±3 0

20Hz dB ±3 0

125Hz dB ±3 0

10kHz dB ±3 0

20kHz dB ±3 0

-2-

DVD

Description Condition Unit Limit Nominal

Video Signal Level Vp-p 0.7±0.1 0.7

SYNC Level Vp-p 0.3±0.1 0.3

Video out level

75% color bar/75ohm

Vp-p 1.0±0.2 1

Video out level(Unload) 75% color bar Vp-p 2.0±0.2 2

CD 1kHz/0dB/10K V 0.6±0.2 0.7

Audio out level

DVD 1kHz/0dB/10K V 2+0/-0.6 1.5

LINE OUT LEVEL 1kHz/0dB/10K V ≥2.8 3.6

20Hz dB ≤±3 0

FREQ RESP (DVD)
(20Hz~20kHz)

125Hz dB ≤±3 0

10kHz dB ≤±3 0

20kHz dB ≤±3 0

Signal-to-noise radio Infinity zere/-dB/L&R∝

dB ≥60 ≥60

Audio distortion&noise (DVD) 1kHz/0dB/L&R dB ≤-65 -65

Dynamic range (DVD) 1kHz/-60dB dB ≥85 ≥85

R/L Cross sound (DVD) 1kHz/0dB/L&R dB ≥45 ≥45

1kHz Channel unbalance 1kHz/0dB/L&R dB ≤3 0

Power Consumption Standby W ≤1 ≤1

DC 9V Rating W ≤12 ≤12

ECC Entircity A BEX TDV-552 um ≥100 100

Scratch A BEX TDV-541 mm ≥1.6 1.6

Black dot A BEX TDV-545 mm ≥ф0.8 0.8

Finger Print A BEX TDV-545 um ≥ф65 65

Vertical deviation A BEX TDV-533 mm ≥0.6 0.6

Note: Nominal specs represent the design specs. All units should be able to approximate these. Some will exceed
and some may drop slightly below these specs. Limit specs represent the absolute worst condition that might still
be considered acceptable. In no case should a unit fail to meet limit specs.

-3-

LCD

O

A

C

BLOCK DIAGRAM

DC T

R

G

B

SYNC

FRP

-13V

15V

5V

9V

7.5V

Y

9V

-4-

DVD

4332211DDCCBB

A

U

S TRACK

DRIVE

R

4

FE TE DRIVER

SPINDLE

5

SLED

A

5

-5-

GENERAL ALIGNMENT INSTRUCTION

The Main PCB of Monitor Modification:

1. Input voltage is 6.8V-16V, input signal is test circuit BY 5418.

2. Adjust VR1 to get horizontal phase shift and test point: 28.9MHz

3. Adjust VRB4 to get good performance..

The main PCB of DVD Modification:

1. Adjust the brightness to the brightest by VR, adjust video pattern’s color to white, test the screen
Brightness is 200±102 LUX.
With luminometer You can adjust R66 to get this standard.

-6-

LCD

SYMPTOM CAUSE REMEDY

LCD MONITOR PART

TROUBLESHOOTING

1) Picture distortion

2) No Picture

3) No Picture, Picture no
Good

4) Luminesce no good

5) Color is no good

6) SYNC no good

7) NO Picture

8) Picture no good

& Defective IC T110 (U301).

& Defective IC201 (D3031).

& Defective IC1 (CSC3414A). & Replace IC1 (CSC3414A).

& Defective IC201 MPS1029.

& Defective X201.

& Defective IC101 CSC1004D.

& Defective Q10 EL7630. & Replace Q10 EL7630.

& Defective CON4. & Replace CON4.

& Replace IC T110 (U301).

& Replace IC201 (D3031).

& Replace IC201 MPS1029.

& Replace X201.

& Replace IC101 CSC1004D.

9) Brightness no good

& Defective ICP1 SS9969. & Replace ICP1 SS9969..

-7-

DVD

DVD PART

SYMPTOM CAUSE REMEDY

1) No Power

2) No Picture

3) No Sound

4) Sound no good

& Power source is not correct.

The positive and negative does not
match the unit.

& Power button defective.

& Defective T3 (24C02).
& Defective IC MTK1389D E/E.

& Defective U8 (4558D).
& Defective U6 (TDA2822)
& Defective U26 (TEA2025B)

& Defective U8 (4558D).

& Replace power source.
& Charge the position of positive

and negative.

& Replace power button.

& Replace T3 (24C02).
& Replace IC MTK1389D E/E.

& Replace U8 (4558D).
& Replace U6 (TDA2822)
& Replace U26 (TEA2025B)

& Replace U8 (4558D).

5) Can not read DISC

6) No key function

7) No remote control
function

& Defective U6 (TDA2822)
& Defective U26 (TEA2025B)
& Defective U3 (AT5654H).
& PICK-up Laser is defective.

& Replace U6 (TDA2822)
& Replace U26 (TEA2025B)
& Replace U3 (AT5654H)
& Replace pick up.

& Defective IC MTK1389D E/E. & Replace IC MTK1389D E/E.

& Defective IR1.
& Key is Defective.

& Replace IR1.
& Replace keys.

-8-

IC201 D3031

INVIN

V

TBRIGHTBRIGHT

S/HS/HS/H

CIN

BLKFRPS/H PULSEGS/H PULSEGS/H PULSEG333534942303127283226292324

B DC DETB OUTG DC DETG OUTR DC DETR OUTSYNC.I

NSYNCOU

T

10BRIGHTBRIGHTSUBBSUB BRIGHTRRGBAMPLITUDE

γ1γ

γ γγγ

IC BLOCK DIAGRAM & DESCRIPTION

2

CONTRAST

PEAK LIMIT

21 2219 203637384846474561

S/H

INV

BRIGH

VREF

SEP

SYNC

SYNCSEP

PICTUREAGC

FILTER

OUT

AGC

CLAMP

COLOR

TRAPH FIL OUT

SW

BGPGEN

PICTURE

AGCAMP

AGCDET

COMP

TRAP

BGP

CLAMP

COLOR

Y/C

P

REG3

N

COMP

Y/C

HPF

P

KIL.LER

N

2

H.FILTER

3

REG2

REG1

41

ACC

COMP

5

ACC.DET

Y/C

APC

VCO

15

14

16

FADJ

VIDEO IN

ACC.FIL

APC.FH

VCO IN

VCO OUT

S/H

394041

EXT B IN

INT/EXTSW

7

SW

MATRIX

G-Y

B-Y

R-Y

DEMOD

P

N

IDENT

KILLER FIL

F/F

SHIFT

PHASE

TINT

13

PAL.SW

V

CC1

V

SYNC IN

1718 43 25 8 12

GNDV

from

4

TINT

IDENTFIL

CC1

V

EXT G IN

EXT R IN

CC1

V

PN

CC2

IE

-14-

IC BLOCK DIAGRAM & DESCRIPTION

APC FILTER

IC201 D3031

SYN C IN

S/H PUL S E B

S/H PUL S E G

S/H PUL S E R

BRI G HT

GAMM A 2

GAMM A 1

FRP

SUB BRI GH T B

SUB BRI GH T R

BLK

Vcc 2

252627282930313233343536

24
23

22
21
20
19

B OUT

B DC DET

G OUT
G DC DET
R OUT

R DC DFT

SYNC OUT

SYNC SEP

EXT B IN

EXT G IN

EXT R IN

CONTRAST

37
38

39
40

41
42

V

EE

Vcc1

F AD J

CLAMP

AGC FILTER

AGC OUT

PICTURE

43
44
45
46
47
48

1 2

TR AP

3

VIDEO IN

H FILTER OUT

5 6

4

C IN

COL OR

IDENT FILTER

8 9 10

7

SW

11 12

ACC FILT E R

KIL LER FILTER

PE A K LIMITT ER

RGB AMPLI TUDE

18

GND

17

V C0 OUT

16
15

Vc0 IN

14

TINT

13

R-Y/B-Y PHASE

1. TRAP 13. TINT 25. VCC 2 37. SYNC OUT

2. H FILTER OUT 14. VCO IN 26. BLK 38. SYNC SEP

3. VIDEO IN 15. APC FILTER 27. SUB BRIGHT R 39. EXT B IN

4. IDENT FILTER 16. VCO OUT 28. SUB BRIGHT B 40. EXT G IN

5. C IN 17. GND 29. FRP 41. EXT R IN

6. COLOR 18. VER 30. GAMMA1 42. CONTRAST

7. SW 19. R DC DET 31. GAMMA2 43. VCC1

8. KILLER FILTER 20. R OUT 32. BRIGHT 44. F ADJ

9. PEAK LIMITTER 21. G DC DET 33. S/H PULSE R 45. CLAMP

10. RGB AMPLITUDE 22. G OUT 34. S/H PULSE G 46. AGC FILTER

11. ACC FILTER 23. B DC DET 35. S/H PULSE B 47. AGC OUT

12. R-Y/B-Y PHASE 24. B OUT 36. SYNC IN 48. PICTURE

-15-

IC BLOCK DIAGRAM & DESCRIPTION

Q10 SS9969

-16-