Daewoo 2708ED User manual

(7 Inch) LCD Color Monitor &

DVD Player

DEC. 2006

DPC-7800NT (2708ED)

OSDPC78001

(7 Inch) LCD Color Monitor & DVD Player

MODEL : DPC-7800NT 2708ED）

CONTENTS

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

Specification....................................................... ............................................... ...

2~3

Block Diagram................................... ................................................................ ...

4~5

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

Troubleshooting........................................................................................... ... ... ..

7~8

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

9~13

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

14~31

Explode View........................................................................................................ ...... .

Schematic Diagram......................................................................................... ..... ..

33~42

-2-

SPECIFICATION

LCD

Description Condition Unit Limit Nominal

Headphone Output 1kHz 0dB mW 3±23

Headphone Noise No Signal mV <1mV <1mV

L1kHz 0dB mW 600±100 600

SPK MAX

Output(DVD) R1kHz 0dB mW 600±100 600

L1kHz 0dB mW 600±100 600

SPK MAX Output(AV

IN) R1kHz 0dB mW 600±100 600

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

REF THD 1kHz 0dB %31

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

20Hz dB ±30

125Hz dB ±30

10kHz dB ±30

LINE OUT RESP(8ohm)

20kHz dB ±30

20Hz dB ±30

125Hz dB ±30

10kHz dB ±30

Headphone RESP

20kHz dB ±30

-3-

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 V0.6±0.2 0.7

Audio out level DVD 1kHz/0dB/10K V2+0/-0.6 1.5

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

20Hz dB ≤±30

125Hz dB ≤±30

10kHz dB ≤±30

FREQ RESP (DVD)

(20Hz~20kHz)

20kHz dB ≤±30

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 ≤30

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.

-4-

BLOCK DIAGRAM

LCD

15V

-13V

SYNC

FRP

7.5V

DC T

-5-

DVD

SLED

FE TE DRIVER

SPINDLE

-6-

GENERALALIGNMENT 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.

-7-

TROUBLESHOOTING

LCD

SYMPTOM CAUSE REMEDY

LCD MONITOR PART

1) Picture distortion &Defective IC T110 (U301).

&Replace IC T110 (U301).

2) No Picture &Defective IC201 (D3031).

&Replace IC201 (D3031).

3) No Picture, Picture no

Good

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

4) Luminesce no good &Defective IC201 MPS1029.

&Replace IC201 MPS1029.

5) Color is no good &Defective X201.

&Replace X201.

6) SYNC no good &Defective IC101 CSC1004D.

&Replace IC101 CSC1004D.

7) NO Picture

&Defective Q10 EL7630. &Replace Q10 EL7630.

8) Picture no good

&Defective CON4. &Replace CON4.

9) Brightness no good

&Defective ICP1 SS9969. &Replace ICP1 SS9969..

-8-

DVD

SYMPTOM CAUSE REMEDY

DVD PART

1) No Power &Power source is not correct.

The positive and negative does not

match the unit.

&Power button defective.

&Replace power source.

&Charge the position of positive

and negative.

&Replace power button.

2) No Picture &Defective T3 (24C02).

&Defective IC MTK1389D E/E.

&Replace T3 (24C02).

&Replace IC MTK1389D E/E.

3) No Sound &Defective U8 (4558D).

&Defective U6 (TDA2822)

&Defective U26 (TEA2025B)

&Replace U8 (4558D).

&Replace U6 (TDA2822)

&Replace U26 (TEA2025B)

4) Sound no good &Defective U8 (4558D).

&Defective U6 (TDA2822)

&Defective U26 (TEA2025B)

&Replace U8 (4558D).

&Replace U6 (TDA2822)

&Replace U26 (TEA2025B)

5) Can not read DISC &Defective U3 (AT5654H).

&PICK-up Laser is defective.

&Replace U3 (AT5654H)

&Replace pick up.

6) No key function &Defective IC MTK1389D E/E. &Replace IC MTK1389D E/E.

7) No remote control

function

&Defective IR1.

&Key is Defective.

&Replace IR1.

&Replace keys.

-14-

IC BLOCK DIAGRAM & DESCRIPTION

IC201 D3031

VREF INV

BRIGH

S/H

INT/EXTSW

MATRIX

DEMOD

R-Y

G-Y

B-Y

IDENT

F/F

PAL.SW

PHASE

SHIFT

TINT

VCO

APC

ACC.DET

ACC

REG1 REG2 REG3

TRAP

COLOR

COMP

Y/C

CLAMP

AGCAMP

AGCDET

PICTURE

SW SYNCSEP

BGPGEN

BGP

Y/C

from SYNC IN

IDENTFIL

TINT

VCO OUT

VCO IN

APC.FH

ACC.FIL

CIN

Y/C

COMP

FADJ

VIDEO IN

21 2219 203637384846474561

1718 43 25 8 12 7

SW 394041

EXT R IN

EXT G IN

EXT B IN

PN VCC1

HPF

KIL.LER

SYNC

SEP

PICTUREAGC

FILTER

AGC

OUT

CLAMP

COLOR

TRAPH FIL OUT

COMP

H.FILTER

VCC1

CC1

GNDV

IE V

CC2 KILLER FIL

CONTRAST

PEAK LIMIT

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