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

-15-
IC BLOCK DIAGRAM & DESCRIPTION
IC201 D3031
37
38
39
40
41
42
43
44
45
46
47
48
SYNCOUT
SYNCSEP
EXTB IN
EXTG IN
EXTR IN
CONTRAST
Vcc1
FADJ
CLAMP
AGCFILTER
AGCOUT
PICTURE
12 3 4 56 7 8910 1112
TRAP
H FILTER OUT
VIDEO IN
IDENT FILTER
C IN
COLOR
SW
KILLER FILTER
PEAK LIMITTER
RGBAMPLITUDE
ACC FILTER
R-Y/B-Y PHASE
13
14
15
16
17
18
19
20
21
22
23
24
B OUT
B DC DET
GOUT
GDC DET
ROUT
RDC DFT
V EE
GND
VC0OUT
APCFILTER
Vc0IN
TINT
252627282930313233343536
SYNC IN S/H PULSE B S/H PULSE G S/H PULSE R BRIGHT GAMMA2 GAMMA1 FRP SUB BRIGHT B SUB BRIGHT R BLK Vcc2
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

-16-
IC BLOCK DIAGRAM & DESCRIPTION
Q10 SS9969

-17-
IC BLOCK DIAGRAM & DESCRIPTION
IC1 CSC3414A
Pin Name Pin Name
1. A OUTPUT 5. B +INPUT
2. A –INPUT 6. B –INPUT
3. A +INPUT 7. B OUTPUT
4. GND 8. V+

-18-
IC BLOCK DIAGRAM & DESCRIPTION
ICH1 MP1029EM
Pin Name Pin Name Pin Name Pin Name
1. AB 6. DR 11. BSTR 16. COMP
2. IL 7. IN 12. PGND 17. FT
3. BOS 8. OUTL 13. OUTR 18. OL
4. DB 9. PGND 14. IN 19. FB
5. EN 10. BSTL 15. REF 20. AGND

-19-
IC BLOCK DIAGRAM & DESCRIPTION
IC101 CSC-1004D
IIMODE IAREA_SEL INPOS2 IVPOS1 IMODE 3 IMODE2 IMODE 1
1718 21202322
19
HVDD
IOVSY
IOHSY
16
15
14
INNP IUND ILNR IOEH_SEL IQ2H_SEL ICPI VSS
OPOLS
10
ONPO
OBLK
OPOLC
13
12
11
OPSC
OPSI
IOMCLK
9
8
7
3
ICLKC
ICOMPS
ICSY
6
5
4
IFRST
IVIY
2
IVSYNC
1
6364 62 61 60 59 58
IRES 1
IZ_SEL
ITST1
IODD_SEL ICPH_SEL ICPO_SEL IIMODE ICPH_SEL ICPO_SEL
2726252824
IRES2 IRES3 LVDD
32313029
33
34
35
OCPO OOEH LVDD OQ2H OSTH2 OSTH1 OCPH3 OCPH2 OCPH1
OCPV
OSTV1
OSTV2
OOE1
OOE2
OOE3
VSS 39
38
37
36
42
41
40
OSRST
OPDA
OOSCO
IOSCI
HVDD
VSS 46
45
44
43
48
47
57 56 55 545352 51 5049
CSC-1004D
PVI-1004
Pin No. Pin name I/O Remarks Pin No. Pin name I/O Remarks
1ivsync Ischimtt 33 ires1 Ipull_down
2iviy Ischimtt 34 iz_sel Ipull_down
3first Ischimtt 35 itst1 IAC/DC test
4icsy Ischimtt 36 ooe3 O3mA
5icomps Ipull_up 37 ooe2 O3mA
6iclkc Ipull_up 38 ooe1 O3mA
7iomclk I/O Bi dir.(3mA) 39 vss
8opsi O3mA 40 ostv2 O3_state(3mA)
9opsc O1mA 41 pstv1 O3_state(3mA)
10 opols O3mA 42 ocpv O3mA
11 opolc O3mA 43 HVDD 5.0V
12 oblk O1mA 44 iosci Ixin (25mhz)

-20-
IC BLOCK DIAGRAM & DESCRIPTION
IC101 CSC-1004
13 onpo O1mA 45 oosco Oxout(25mhz)
14 iohsy I/O Bi dir.(3mA) 46 vss
15 iovsy I/O Bi dir(3mA). 47 opda O3_state(3mA)
16 HVDD 5.0V 48 osrst O1mA
17 imode1 Ipull_down 49 ocph1 O6mA
18 imode2 Ipull_down 50 ocph2 O6mA
19 imode3 Ipull_down 51 pcph3 O6mA
20 ivpos1 Ipull_down 52 osth1 O3_state(3mA)
21 ivpos2 Ipull_down 53 osth2 O3_state(3mA)
22 VSS 54 oq2h O3mA
23 ihpos1 Ipull_up 55 LVDD 3.3V
24 ihpos2 Ipull_up 56 ooeh O3mA
25 iarea_sel Ipull_up 57 ocpo O3mA
26 iimode Ipull_up 58 VSS
27 icpo_sel Ipull_up 59 icpi I
28 icpo_sel Ipull_up 60 iq2h_sel Ipull_up
29 iodd_sel Ipull_up 61 ioeh_sel Ipull_up
30 LVDD 3.3V 62 ilnr Ipull_up
31 ires3 Ipull_down 63 iund Ipull_up
32 ires2 Ipull_down 64 innp Ipull_up

-21-
IC BLOCK DIAGRAM & DESCRIPTION
ICP1 EL7630
Pin Name
1. LX
2. GND
3. FB
4. ENAB
5. VIN

-22-
IC BLOCK DIAGRAM & DESCRIPTION
DVD T3 AT24C02
PIN
NAME PIN NAME
1. A0 5. SDA
2. A1 6. SCL
3. A2 7. WP
4. GND 8. VCC
STOP
START
LOGIC CONTROL
LOGIC
SERIAL
ADDRESS
COMPARATOR
DEVICE
H.V. PUMP/TIMING
ADDR/COUNTER
DATA WORD
YDEC
DATA RECOVERY
SERIAL MUX
EEPROM
X DEC
LOGIC
Dout/ACK
VCC
GND
WP
SCL
SDA
A2
A1
A0
LOAD
COMP
LOADINC
R/W
D
D
IN
OUT
EN
1234
8 65
7
AT24C02
VCCWPSCLSDA
A0A1A2GND

-23-
IC BLOCK DIAGRAM & DESCRIPTION
DVD U8 4558D
PIN NAME PIN NAME
1. AOUT 5. BIN+
2. AIN- 6. BIN-
3. AIN+ 7. BOUT
4. V- 8. V+

-24-
IC BLOCK DIAGRAM & DESCRIPTION
DVD T2 M12L64164A