Daewoo DPC-7200N User manual

S er v ice M a nua l
LCD Color Monitor &
DVD Player
Model: DPC-7200N
S/ M No. : OSPC7200N1
May. 2005
C aution
: In this Manual, some parts can be changed for improving,
their performance without notice in the parts list.

-2-
CONTENTS
----------------
Specification....................................................... ............................................... ...
3
Block Diagram................................... ................................................................ ... 5
General Alignment Instruction....................................................................... ...... 7
Troubleshooting........................................................................................... ... ... ..
8
PrintedCircuitBoard........................................................................................ ... ... 10
ICBlock Diagram and LeadIdentification....................................................... .. .. 16
Explode View........................................................................................................ ...... . 31
SchematicDiagram......................................................................................... ..... .. 32

-3-
SPECIFICATION
LCD MONITOR
Model No.: DPC-7200N Output: 50mW/16ohm SupplyVoltage:
Description Condition Unit LimitNominal
Headphone Output1KHz0dB mW 3±23
Headphone NoiseNo Signal mV <1mV<1mV
L1KHz0dB mW 600±100 600
SPK MAXOutput R1KHz0dB mW
600±100
600
L1KHz0dB mW
600±100
600
SPK MAXOutput(AV IN) R1KHz0dB mW
600±100
600
REF THD 1KHz0dB %53
SPK S/N Infinity zere/-dB/L&R dB 35 35
Headphone S/N Infinity zere/-dB/L&R dB 60 60
Luminance(MAX)White Signal LUX 300±50 300
Luminance(8STEP)White Signal LUX 250±50 250
Luminance(MIN)White Signal LUX 100±50 100
20HzdB ±30
125HzdB ±30
10KHzdB ±30
L
20KHzdB ±30
20HzdB ±30
125HzdB ±30
10KHzdB ±30
Headphone RESP
R
20KHzdB ±30

-4-
DVD
Model No.: DPC-7200N Output:50mW/16ohm Supply Voltage:
Description Condition Unit LimitNominal
VideoSignal LevelVp-p 0.7±0.1 0.7
SYNC LevelVp-p 0.3±0.1 0.3
Videoout level
75% color
bar/75ohm Vp-p
1.0±0.2 1
Videoout level(Unload) 75%color bar Vp-p 2.0±0.2 2
CD 1KHz/0dB/10K V2.0±0.2 2
Audio out level DVD
1KHz/0dB/10K V2.0±0.2
2
20Hz dB ≤±3 0
125Hz dB ≤±3 0
10KHz dB ≤±3 0
FREQ RESP (DVD)
(20Hz~20KHz)
20KHz dB ≤±3 0
Signal-to-noiseradio Infinity zere/-dB/L&R dB 60 60
Audiodistortion&noise(DVD) 1KHz/0dB/L&R dB ≤-65 -65
Dynamicrange(DVD) 1KHz/-60dB dB 85 85
R/L Cross sound(DVD) 1KHz/0dB/L&R dB 45 45
1KHzChannel unbalance(DVD) 1KHz/0dB/L&R dB ≤3 0
Power Consumption StandbyW00
DC 9V Rating W ≤12 ≤12
ECC EntircityABEXTDV-552 um
100 100
Scratch ABEXTDV-541 mm
1.6 1.6
Black dotABEXTDV-545 mm
ф0.8
0.8
Finger Print ABEXTDV-545 um
ф65
65
Verticaldeviation ABEXTDV-533 mm
0.6 0.6
Note: Nominal specs represent the design specs. All units should be abletoapproximate these. Somewill
exceed and some maydrop slightlybelow these specs.Limit specsrepresent the absolute worstcondition that
might still be considered acceptable. In no case should a unit fail to meet limit specs.

-5-
BLOCK DIAGRAM
LCD
OZ9936
YC
H
S
Y
N
C
S
W
R
G
B
IR3Y31
8
D
0
2
DC
RT9266
+12V +7V -10V
7
”
L
G
P
A
N
E
L
H.V. TRAN
DC
H
I
G
H
V
O
L
T
A
G
E
O
S
C

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DVD
1234
A
B
C
D
E
F
4321
F
E
D
C
B
A
MPEGDECODER RISCCONCROL
MTK1389D
EEPROM
AT24C02-SOP8
ICDATA
ICCLK
SERVODRIVER
CD5954
SPINDLEVELOCITYERROR
FETEDRIVER
PICKUP
FOCUSTRACKSLEDDRIVER
MOTORVELOCITY
RFSIGNALGROUP
27.000MHZ
8BITBUS
KEYSIGAL
16BITBUS
SDAM4Mx16BIT
FLASH1Mx8BIT DECODERMICROCODE
REMOTE SENSOR
AUDIODACAUDIO
AMP
FILTER
VIDEODAC
VIDEOOUT
AUDIODATABUS
L&R
L&ROUT
+9VINPUT
DC/DCCONVERT
+5V+3.3V
DC/DCCONVERT
8032MCU SERVODSP
KEYBOARD
DVDDECK

-7-
GENERAL ALIGNMENTINSTRUCTION
TheMain PCB of Monitor Modification:
1. Input voltage is 6.8V-16V, input signal is test circuit BY5418.
2. Adjust VRT5 to get test point: 15720Hz..
3. Adjust VRT4 to get horizontal phase shift.
4. Adjust VRT1 to get good performance.
5. Adjust S201. S202 to get good Tint.
Themain PCBof DVD Modification:
1. Adjust the brightness to the brightest byVR, adjust video pattern’scolor to white, test the screen
Brightness is 200±102 LUX.
With luminometer You can adjust R69 to get this standard.

-8-
TROUBLESHOOTING
LCD
SYMPTOM CAUSEREMEDY
LCD MONITOR PART
1) Picture distortion &Defective capacitor (C201) &Replace capacitor C201.
2) No Picture &Defective IC (IR3Y31).
&
Replace IC IR3Y31.
3) No Picture, Picture no
Good
&Defective Q7, Q8. &Replace Q7, Q8.
4) Color is no good &Defective X201. &Replace X201.
5) SYNC no good &Defective IC 8D02. &Replace IC 8D02.
6) TINT no good &Defective S201, S202
&
Replace S201,S202.
7) NO Picture &Defective IC RT9266. &Replace RT9266.
8) Picture no good
&Defective CON1. &Replace CON1.
9) Brightness no good
&Defective IC M5237 Q10. &Replace IC M5237 Q10.

-9-
DVD
SYMPTOM CAUSEREMEDY
DVD PART
1)No Power &Power source is not correct.
The positive and negative does not
match the unit.
&Power button defective.
&Defective triode U7.
&Replace power source.
&Change the position of
positive and negative.
&Replace power button.
&Replace U7.
2)No Picture &Defective U10 (24C02N).
&Defective U5.
&Defective IC MTK1389D.
&Replace U10 (24C02N).
&Replace U5.
&Replace IC MTK1389D.
3)No Sound &Defective U14 (C4558).
&Defective U1 (14053).
&Defective U2.
&Replace U14 (C4558).
&Replace U1 (14053).
&Replace U2.
4)Sound no good &Defective U14.
&Replace U14.
5)Can not read DISC &Defective U18.
&PICK-up Laser is defective.
&Replace U18.
&Replace pickup.
6)No keyfunction &Defective IC MTK1389D. &Replace IC MTK1389D.
7)No remote control function &Defective REMOTE.
&
Keyis Defective.
&Replace REMOTE.
&
Replace keys.

-10-
PRINTED CIRCUITBOARD
Monitor MainPCB
Top View