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SDNW551001

DVD PLAYER

DN-W551

AUG. 2006
Daewoo DN-W551 Service Manual

Daewoo DN-W551 Service manual

Table of Contents

page
General Section ............................................................................ 2
Cautions/Warnings
Safe Warnings
Precautions
Software Upgrade

Circuit Diagram and Component Layout ............................................. 5
MPEG IC Block Diagrams
Power supply Circuit Diagram and Component Layout
MPEG Circuit Diagram and Component Layout
Front panel Circuit Diagram and Component Layout

Servicing Procedures ...................................................................... 22
Power Supply Trouble Service Flow Chart
Read Disc Trouble Service Flow Chart
Video Trouble Service Flow Chart
Digital Audio Trouble Service Flow Chart
Composite Analogy Audio Trouble Service Flow Chart
Front Control Trouble Service Flow Chart
Remote Control Trouble Service Flow Chart

Parts List .......................................................................... 30
Power parts list
Front panel parts list
MEPG parts list

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Daewoo DN-W551 Service Manual

1. General Section
1.1. Cautions/Warnings
1.1.1. Product Safety Notice
Parts marked with the symbol in the schematic diagram have critical
characteristics.
Use ONLY replacement pares recommended by the manufacturer. It is
recommended that the unit be operated from a suitable DC supply or batteries
during initial check out procedures.

1.1.2. Leakage Current Check/Resistance Check
Before returning the unit to the customer, make sure you make either (1)
a leakage current check or (2) a line to insulated resistance check.
If the leakage current exceeds 0.5 milliamps, or if the resistance from
chassis to either side of the power cord is less than 240 K ohms, the unit
is defective.

WARNING: DO NOT return the unit to the customer until the problem or
located and corrected.

1.2. Safe Warnings
1.2.1. Protection of Eyes from Laser Beam
To protect eyes from invisible laser beam during servicing

DO NOT LOOK AT THE LASER BEAM

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1.2.2. Laser Caution
CAUTION

Adjusting the knobs, switches, and controls, etc. or taking actions not
specified herein may result in a harmful emission of laser beams. This
CD Changer must be adjusted and repaired only by qualified service
personnel.
Laser symbol:

THIS IS COMPACT DISC PLAYER IS CLASSIFIED AS A CLASS 1 LASER PRODUCT.
THE LASS 1 LASER PRODUCT LABEL IS LOCATED ON THE REAR EXTERIOR.

1.3. Precautions
1.3.1. ESD Precautions in Repairing
1.3.1.1. Do not apply excessive pressure on the mechanical parts
(moving pares), including the Pickup Block, as extremely high
mechanical precision or required in these parts.
1.3.1.2. When soldering the microprocessor and signal processing IC's,
use a ceramic soldering iron or a soldering iron whose metal part
is grounded since they are not resistant to static electricity.
1.3.1.3. When removing the solder or soldering the laser shorting lands
for the Pickup Block, use a ceramic soldering iron or a soldering
iron whose metal part is grounded since the laser diode or not
resistant to static electricity.
1.3.2. DVD Loading Unit Precautions when handling the Mechanism Block
1.3.2.1. Do not loosen any screws in the Pickup Block.
1.3.2.2. Do not adjust any screws in the Mechanism Block except for "Tilt

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Daewoo DN-W551 Service Manual

Adjust Screws", as they are adjusted precisely at the factory.
1.3.2.3. Replacement of the Pickup Block is impossible. Always replace
the Traverse Ass'y when the Pickup Block needed to be replaced.
Do not touch the lens or lens holder of the Pickup Block.
1.3.2.4. The Guide Rails of the Pickup Block are greased. Take care
when handing.
1.3.2.5. When you try to slide the Pickup Block, do not press or pull it
directly. Always turn the dive gears with your fingers.
1.3.2.6. Be sure that the anti-slipping rubber on the turntable or clean. If
there is dust or it is greasy, clean the part with the liquid that
contains 50% each of alcohol and water.
1.3.2.7. When removing the Mechanism P.C.B. Ass'y, you need to
short-circuit the laser diode shorting lands beforehand.
1.4. Software Upgrade
You can upgrade DVD Player using the software we provide as following step:
Creating a software upgrade CD
Use only a new CD-R/CD-RW(not an erased one).
Give the CD a name of your choice(e.g. version and unit name).
Burn the unpacked documents on the CD-R/CD-RW.
The root directory(uppermost level) of the software upgrade CD
Attention: If a failure should occur during the software upgrade (e.g. a mains failure), it may
happen that the units function and a restart of the upgrade function are no longer possible. If this
should be the case, you must replace the intergraded FLASH ICs with preprogrammed ICs (see
corresponding spare parts list).
Insert the upgrade CD (see corresponding spare parts list) and observe the hints on the display
and on the screen of the TV set.
Carry out an initialization of the set.

Displaying the Software Version Number
Press one after the other the "STOP" and "EJECT" buttons on the unit.
Press the"OSD" with the remote control.
Using the cursor buttons on the remote control, select the software version "MICRO Version"
or "CUSTOMER VERSION" .The respective software version number then is displayed

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Daewoo DN-W551 Service Manual

2. Circuit Diagram and Component Layout
2.1. MPEG IC Block Diagrams

Fig.2-1 Vaddis MTK1389QE/D

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Daewoo DN-W551 Service Manual

Fig.2-2 Vaddis MTK1389QE/D block diagram

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Table1. Vaddis MTK1389QE/D Pin`s operational function description

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2.2.1Power supply Circuit Diagram and Component Layout (Infinoen)

Fig 2-1 Power Supply Circuit Diagram

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Fig2-2 Power Supply Assembly Drawing

Fig 2-3 Power Supply Composite

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2.3.MPEG Circuit Diagram and Component Layout
2.3.1MPEG Circuit Diagram

Fig 2-4 MTK1389QE/D&SDRAM

Fig 2-5RF AMPLIFIER&DRIVER

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Fig 2-6 AUDIO&VIDEO FILTER

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Fig 2-7 MEMORY

Fig2-8 POWER PORT

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2.3.2.MPEG Assembly Drawing(Fig 2-99)

2.3.3.MPEG Composite (Fig 2-10)

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2.4. Front panel Circuit Diagram and Component Layout

Fig 2-11 Front Panel Circuit Diagram

Fig 2-12 Front Panel Assembly Drawing

Fig 2-13 Front Panel Composite

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3. Servicing Procedures
3.1. 1 Power Supply Trouble Service Flow Chart Infineon

Power Supply
Block Trouble

NG
Check F1 Condition Replace F1

Check on DA1/DA2/DA3/DA4 NG Replace
DA5/DA6/DB2/DB3/DB4/DB7/ DA1/DA2/DA3/DA4DA5/DA6/DB
DB8 2/DB3/DB4/DB7/DB8
Output Voltage Condition

OK
NG
Check on U3 Replace U3
Voltage Condition
Pin1(2.4V)/ Pin2(0V)/ Pin3 (2.6V)
NG
NG
Check on U2 Replace U2

NG
NG
Check on U1 Replace U1

Check C104
Output Voltage

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3.2. Read Disc Trouble Service Flow Chart
Read disc problem in a DVD player is a very complicated issue that may
involve complex issues. This problem is not only relation to the electronic
circuit, but also very much relation to the operation environment.
DVD loading unit is a very complicate part that contains big number of ESD
components, which require specific equipment, tools and technique to repair;
in general, service technician is not suggested to disassemble the DVD
loading unit. It is suggest proving the trouble and replacing the complete DVD
loading unit, instead of repairing the DVD loading unit in local workshop.
It is suggested to prove the faulty of a DVD loading unit by replacement by a
good DVD loading unit.
Before checking the "NO Disc" Trouble, ensure excluding the following
possibilities:
The test disc is damage.
AC power supply voltage dropped below the minimum required level.
DVD disc region code and color system is not matching to the DVD
player or system setting.
Moisture condensed inside the unit. (Power on the unit, without disc
loaded, for 1/2 to 2 hours).

Service Flow Chart

Read DISC Trouble

Check DVD LOADER NG
Replace Connector
Connector Condition

Replace DVD Loading Unit

Check the MEPG ATAPI Check the other Parts by

I/F Interface Circuit Replacement Method

3.3. Video Trouble Service Flow Chart
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3.3.1. Composite Video Trouble Service Flow Chart

Composite Video Trouble

NG
Check Composite Video Replace Composite Video Parts
Output Signal

OK
NG
Check "SETUP" Item See "User Manual"

OK
NG
Check CP3 Signal Replace CP3

OK
NG
Check R107 D12 D14 Replace R107 D12 D14
Q16 L36 Signal Q16 L36

Check U2 (Pin175) Signal

Replace U2

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3.3.2. S-Video Trouble Service Flow Chart

S-Video Trouble

NG
Check S-Video Output Signal Replace S-Video Parts

NG
Check "SETUP" Item See "User Manual"

OK
NG
Check CP1 Signal Replace CP1

OK
NG
Check R85/R80 Signal Replace R85/80

OK
NG
Check Q38 Q39 Signal Replace Q38 Q39

Check U2 ( Pin181/182) signal

Replace U2

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3.4. Digital Audio Trouble Service Flow Chart

Digital Audio Trouble

NG
Check "SETUP" Item See "User Manual"

OK
NG
Check Optical/Coaxial
Out Signal Replace Optical/Coaxial

OK
NG
Check CP3/CP4 Signal Replace CP3/CP4

OK
NG
Check R113/R114/R117 Replace R113/R114/R117/C155
C155 Signal

OK
NG
Check U2 ReplaceU2

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3.5 Composite Analogy Audio Trouble Service Flow Chart

Composite Analogy Audio Trouble

NG
Check CP3 Signal Replace CP3

OK
NG
Check Q18/Q19/Q20/Q21 Replace Q18/Q19/Q20/Q21
/Q25/Q26 /Q25/Q26

OK
Check U11/U13/U14 [Pin4(-12V), NG Replace U11/U13/U14
Pin8(+12V)]

OK
NG
Check U16(Pin19/20/23/24) Replace U16
26/27)

OK
Check U2(Pin 163/164/165) NG Replace U2

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3.6. Front Control Trouble Service Flow Chart

Front Control Trouble

NG
Check between CN1 Connection Replace CN1

OK
NG
Check U1 pin7 Vol 5V Check EC1 C1

OK OK NG

Check LED Array Replace U1 Replace EC1 C1

Replace LED Array

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3.7. Remote Control Trouble Service Flow Chart

Remote Control Trouble

NG NG
Check Remote Control Replace Battery Replace Control

OK
NG
Check IR (Pin1 )Voltage Check Power Supply

Check IR (Pin3) Output Signal

Replace IR

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4. Parts List

4.1. 1Power parts list Infinoen

NO. PART NO. DESCRIPTION QTY LOCATION
Carbon Resistor
1 20-200132-03100 1/6W 1K

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