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....................................................................... ...... 6
Troubleshooting........................................................................................... ... ... .. 7~8
Printed Circuit Board........................................................................................ ... ... 9~13
IC Block Diagram & Description......................................................................... .. .. 14~31
Explode View........................................................................................................ ...... . 32
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
G
B
9V
Y
9V
SYNC
FRP
5V
R
7.5V
DC T
O
A
C

-5-
DVD
5 5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
U
S
T
R
A
C
K
SLED
D
R
I
V
E
R
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
I
N
V
I
N
V
BRIGH
T
B
R
I
G
H
T
B
R
I
G
H
T
S/H
S
/
H
S
/
H
S
/
H
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
N
Y/C
N
P
N
from SYNC IN
IDENTFIL
TINT
VCO OUT
VCO IN
APC.FH
ACC.FIL
CIN
Y/C
COMP
FADJ
VIDEO IN
B
L
K
F
R
P
S
/
H
P
U
L
S
E
G
S
/
H
P
U
L
S
E
G
S
/
H
P
U
L
S
E
G
3
3
3
5
3
4
9
4
2
3
0
3
1
2
7
2
8
3
2
2
6
2
9
2
3
2
4
21 2219 203637384846474561
2
3
41
5
15 14 16 13
4
1718 43 25 8 12 7
SW 394041
EXT R IN
EXT G IN
EXT B IN
PN VCC1
HPF
KIL.LER
B
D
C
D
E
T
B
O
U
T
G
D
C
D
E
T
G
O
U
T
R
D
C
D
E
T
R
O
U
T
S
Y
N
C
.
I
N
S
Y
N
C
O
U
T
SYNC
SEP
PICTUREAGC
FILTER
AGC
OUT
CLAMP
COLOR
TRAPH FIL OUT
COMP
H.FILTER
VCC1
V
CC1
GNDV
IE V
CC2 KILLER FIL
P
P
1
0
B
R
I
G
H
T
B
R
I
G
H
T
S
U
B
B
S
U
B
B
R
I
G
H
T
R
R
G
B
A
M
P
L
I
T
U
D
E
1 2
CONTRAST PEAK LIMIT