LG DP561B Service Manual

PORTABLE DVD

SERVICE MANUAL

MODEL: DP561B

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

Website http://biz.lgservice.com

Internal Use Only

MODEL: DP561BSERVICE MANUAL

1102,HCRAMAFN73290768:ON/P

CONTENTS

SECTION 1.........SUMMARY

SECTION 2.........EXPLODED VIEWS

SECTION 3.........ELECTRICAL

SECTION 4.........REPLACEMENT PARTS LIST

1-1

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS .............................................. 1-3

SERVICING PRECAUTIONS .......................................................................................................................... 1-4

• GENERAL SERVICING PRECAUTIONS

• INSULATION CHECKING PRODEDURE

• ELECTROSTATICALLY SENSITIVE (ES) DEVICES

SPECIFICATIONS ............................................................................................................................................ 1-5

1-2

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

IMPORTANT SAFETY NOTICE

This manual was prepared for use only by properly trained audio-video service
technicians.
When servicing this product, under no circumstances should the original design be
modified or altered without permission from LG Corporation. All components should
be replaced only with types identical to those in the original circuit and their physical
location, wiring and lead dress must conform to original layout upon completion of
repairs.

Special components are also used to prevent x-radiation, shock and fire hazard.
These components are indicated by the letter “x” included in their component des­ignators and are required to maintain safe performance. No deviations are allowed
without prior approval by LG Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way,
implementation of the latest safety and performance improvement changes into the
set are not delayed until the new service literature is printed.

CAUTION: Do not attempt to modify this product in any way. Never perform cus-

tomized installations without manufacturer’s approval. Unauthorized modifications
will not only void the warranty, but may lead to property damage or user injury.

Service work should be performed only after you are thoroughly familiar with these
safety checks and servicing guidelines.

GRAPHIC SYMBOLS

The exclamation point within an equilateral triangle is intended to
alert the service personnel to important safety information in the
service literature.
The lightning flash with arrowhead symbol within an equilateral
triangle is intended to alert the service personnel to the presence of
noninsulated “dangerous voltage” that may be of sufficient magnitude
to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equi­lateral triangle is intended to convey to the service personnel the
following fuse replacement caution notice:
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.

SERVICE INFORMATION

While servicing, use an isolation transformer for protection from AC line shock. After
the original service problem has been corrected, make a check of the following:

FIRE AND SHOCK HAZARD

1. Be sure that all components are positioned to avoid a possibility of adjacent
component shorts. This is especially important on items trans-ported to and from
the repair shop.

2. Verify that all protective devices such as insulators, barriers, covers, shields,
strain reliefs, power supply cords, and other hardware have been reinstalled per
the original design. Be sure that the safety purpose of the polarized line plug has
not been defeated.

3. Soldering must be inspected to discover possible cold solder joints, solder
splashes, or sharp solder points. Be certain to remove all loose foreign par­ticles.

4. Check for physical evidence of damage or deterioration to parts and compo­nents, for frayed leads or damaged insulation (including the AC cord), and
replace if necessary.

5. No lead or component should touch a high current device or a resistor rated at 1
watt or more. Lead tension around protruding metal surfaces must be avoided.

6. After reassembly of the set, always perform an AC leakage test on all exposed
metallic parts of the cabinet (the channel selector knobs, antenna terminals,
handle and screws) to be sure that set is safe to operate without danger of
electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING
THIS TEST. Use an AC voltmeter having 5000 ohms per volt or more sensitivity
in the following manner: Connect a 1500 ohm, 10 watt resistor, paralleled by a
.15 mfd 150V AC type capacitor between a known good earth ground water pipe,
conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC volt­age across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse
the AC plug by using a non-polarized adaptor and repeat AC voltage measure­ments for each exposed metallic part. Voltage measured must not exceed 0.75
volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit
constitutes a potential shock hazard and must be corrected immediately.

TIPS ON PROPER INSTALLATION

1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf
space over, or close to, a heat duct, or in the path of heated air flow.

2. Avoid conditions of high humidity such as: outdoor patio installations where dew
is a factor, near steam radiators where steam leakage is a factor, etc.

3. Avoid placement where draperies may obstruct venting. The customer should
also avoid the use of decorative scarves or other coverings that might obstruct
ventilation.

4. Wall- and shelf-mounted installations using a commercial mounting kit must
follow the factory-approved mounting instructions. A product mounted to a shelf
or platform must retain its original feet (or the equivalent thickness in spacers) to
provide adequate air flow across the bottom. Bolts or screws used for fasteners
must not touch any parts or wiring. Perform leakage tests on customized instal­lations.

5. Caution customers against mounting a product on a sloping shelf or in a tilted
position, unless the receiver is properly secured.

6. A product on a roll-about cart should be stable in its mounting to the cart.

Caution the customer on the hazards of trying to roll a cart with small casters

across thresholds or deep pile carpets.

7. Caution customers against using extension cords. Explain that a forest of exten­sions, sprouting from a single outlet, can lead to disastrous consequences to
home and family.

1-3

SERVICING PRECAUTIONS

CAUTION: Before servicing the PORTABLE DVD covered by
this service data and its supplements and addends, read and
follow the SAFETY PRECAUTIONS. NOTE: if unforeseen
circumstances create conflict between the following servicing
precautions and any of the safety precautions in this publica­tion, always follow the safety precautions.
Remember Safety First :

General Servicing Precautions

1. Always unplug the PORTABLE DVD AC power cord from
the AC power source before:

(1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnecting or reconnecting any internal electrical

plug or other electrical connection.

(3) Connecting a test substitute in parallel with an electro-

lytic capacitor.

Caution: A wrong part substitution or incorrect polarity

installation of electrolytic capacitors may result in an
explosion hazard.

2. Do not spray chemicals on or near this PORTABLE DVD or
any of its assemblies.

3. Unless specified otherwise in this service data, clean elec­trical contacts by applying an appropriate contact cleaning
solution to the contacts with a pipe cleaner, cotton-tipped
swab, or comparable soft applicator.

Unless specified otherwise in this service data, lubrication

of contacts is not required.

4. Do not defeat any plug/socket B+ voltage interlocks with
which instruments covered by this service manual might be
equipped.

5. Do not apply AC power to this PORTABLE DVD and / or
any of its electrical assemblies unless all solid state device
heat sinks are correctly installed.

6. Always connect the test instrument ground lead to an
appropriate ground before connecting the test instrument
positive lead. Always remove the test instrument ground
lead last.

Insulation Checking Procedure

Disconnect the attachment plug from the AC outlet and
turn the power on. Connect an insulation resistance meter
(500V)
to the blades of the attachment plug. The insulation resistance
between each blade of the attachment plug and accessible
conductive parts (Note 1) should be more than 1Mohm.
Note 1: Accessible Conductive Parts include Metal panels,
Input terminals, Earphone jacks,etc.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called Electrostatically Sensitive (ES) Devices. Examples
of typical ES devices are integrated circuits and some field
effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the
incidence of component damage caused by static electricity.

1. Immediately before handling any semiconductor compo­nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commer­cially available discharging wrist strap device, which should
be removed for potential shock reasons prior to applying
power to the unit under test.

2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such
as aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder
ES devices.

4. Use only an anti-static solder removal device. Some solder
removal devices not classified as “anti-static” can generate
electrical charges sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate
an electrical charge sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install
it. (Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum
foil, or comparable conductive material).

7. Immediately before removing the protective material from
the leads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.

Caution: Be sure no power is applied to the chassis or

circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Normally harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static elec­tricity sufficient to damage an ES device.)

1-4

SPECIFICATIONS

• GENERAL

Power requirements 1 12 V 2.0 A

External Dimensions (W x H x D) (195 x 48 x 154) mm

Net Weight (Approx.) 1.05 kg (with a battery)

Operating temperature 0 °C to 40 °C

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• CONNECTORS

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• INPUT

• LIQUID CRYSTAL DISPLAY

• ACCESSORIES

- Audio/Video adapter

- AC Adapter (IM120WE-200B)

- Automotive Adapter

- Remote Control

- Battery for Remote Control (Lithium Battery)

- Battery pack

- Carry bag (DP560B/DP561B only)

- Car mount (DP560B/DP561B only)

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1-5

MEMO

1-6

SECTION 2

EXPLODED VIEWS

CONTENTS

EXPLODED VIEWS ......................................................................................................................................... 2-2

1. CABINET AND MAIN FRAME SECTION ................................................................................................. 2-2

2. PACKING ACCESSORY SECTION ......................................................................................................... 2-3

2-1

2-2

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION

SVC purchase order caution

Supplied is only assembly part.

413

413

413

A48

263

A51

A00

A46

413

414

277

A42

A49

277A

A40

264

413

413

413

413

413

414

LCD&KEY BOARD

MAIN BOARD

FM BOARD

USB BOARD

F

B

C

A

A

D

E

F

C

B

B

D

E

279

278

A43

A44

413

A52

809

2-3

2. PACKING ACCESSORY SECTION

PLUG ASS'Y(RCA CABLE)

806

834

ADAPTER

833

REMOTE CONTROL

900

802A ACCESSORY BOX

808

REMOCON BATTERY

801

OWNER'S MANUAL

CABLE, CIGAR JACK

804

PACKING SHEET

803C PACKING

803A PACKING

803 PACKING

835

CAR-MOUNT

839

CARRING CASE

803B PACKING

BOX

802

MEMO

2-4

SECTION 3

ELECTRICAL

CONTENTS

ELECTRICAL TROUBLESHOOTING GUIDE ............................................................................................... 3-2

1. POWER CIRCUIT .................................................................................................................................... 3-2

2. MPEG CIRCUIT ....................................................................................................................................... 3-5

3. SERVO CIRCUIT ..................................................................................................................................... 3-6

4. CHARGING CIRCUIT .............................................................................................................................. 3-8

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ..................................................... 3-9

1. SYSTEM 27MHZ CLOCK, RESET, FLASH SCK SIGNAL. ..................................................................... 3-9

2. SDRAM CLOCK .................................................................................................................................... 3-10

3. TRAY OPEN/CLOSE SIGNAL ............................................................................................................... 3-10

4. SLED CONTROL RELATED SIGNAL ................................................................................................... 3-10

5. LASER POWER CONTROL RELATED SIGNAL .................................................................................. 3-11

6. SPINDLE CONTROL WAVEFORM ....................................................................................................... 3-12

7. FOCUS ON WAVEFORM ...................................................................................................................... 3-12

8. TRACKING CONTROL RELATED SIGNAL(System checking) ........................................................... 3-13

9. SPHE8202P VIDEO OUTPUT WAVEFORM ........................................................................................ 3-14

10. AUDIO OUTPUT FROM SPHE8202P ................................................................................................ 3-14

WIRING CONNECTION DIAGRAMS .......................................................................................................... 3-15

OVERALL CONNECTION LAYOUT DIAGRAM ......................................................................................... 3-17

BLOCK DIAGRAMS .................................................................................................................................... 3-18

1. OVERALL BLOCK DIAGRAM_1 ...........................................................................................................3-18

2. OVERALL BLOCK DIAGRAM_2 ...........................................................................................................3-19

3. POWER BLOCK DIAGRAM ..................................................................................................................3-20

4. SERVO BLOCK DIAGRAM ...................................................................................................................3-21

5. SYSTEM BLOCK DIAGRAM ................................................................................................................. 3-22

6. AV BLOCK DIAGRAM ........................................................................................................................... 3-23

THE PROCESS OF USB DOWNLOAD .................................................................................................... 3-24

CIRCUIT DIAGRAMS .................................................................................................................................. 3-27

1. MPEG CIRCUIT DIAGRAM ................................................................................................................... 3-27

2. SDRAM & FLASH CIRCUIT DIAGRAM ................................................................................................. 3-29

3. DC-DC & MOTOR CIRCUIT DIAGRAM ............................................................................................... 3-31

4. AV CIRCUIT DIAGRAM ......................................................................................................................... 3-33

5. CHARGE CIRCUIT DIAGRAM .............................................................................................................. 3-35

6. PANEL CIRCUIT DIAGRAM .................................................................................................................. 3-37

7. FM-T CIRCUIT DIAGRAM ..................................................................................................................... 3-39

8. MENU KEY CIRCUIT DIAGRAM .......................................................................................................... 3-41

9. LCD TFT DRIVE CIRCUIT DIAGRAM ................................................................................................... 3-43

CIRCUIT VOLTAGE CHART ....................................................................................................................... 3-45

PRINTED CIRCUIT BOARD DIAGRAMS ................................................................................................... 3-51

1. MAIN & USB P.C. BOARD ....................................................................................................................3-51

2. LCD P.C.BOARD ................................................................................................................................... 3-53

3. FM P.C. BORAD .................................................................................................................................... 3-54

3-1

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER (DC-DC CONVERTER) CIRCUIT

A. POWER

No power on

by ADAPTER

YES

Is

ADAPTER

out 12 V

YES

A

A

YES

NO

Replace ADAPTOR

No power on

by BATTERY

YES

Is

ADAPTER

out 12 V

YES

A

NO

Replace

BATTERY

YES

Is 3.3 V OK?

YES

Replace U7

NO

No +3.3 V No +5 V No LCD powerNo +1.2 V

Replace U9 Replace U9

3-2

Replace

XP6 or XP5

ELECTRICAL TROUBLESHOOTING GUIDE

B. AUDIO OUT ABNORMAL

Audio out abnormal

YES

Check Audio jack & mode

YES

Check +5 V

YES

Check signals from MPEG

YES

Replace IC(U13)

C. VIDEO OUT ABNORMAL

Video out abnormal

YES

Check Video jack & mode

YES

Check Video signals from MPEG

YES

Check IC(U6)

D. PICTURE ABNORMAL

Picture abnormal

YES

Check the disc.

YES

Refer to SERVO part

YES

Check MPEG_CLK

Signal of MPEG part

YES

Check MPEG IC(U6)

E. DISC ERROR

Disc error

YES

Check Disc

YES

Refer to SERVO part

3-3

ELECTRICAL TROUBLESHOOTING GUIDE

F. OPEN/CLOSE ABNORMAL

OPEN/CLOSE abnormal

YES

Check SW2 switch

YES

Check IC(U7) Pin 19

NO

Check the connectin of MD

YES

Refer to SERVO part

YES

Refer to SERVO part

3-4

ELECTRICAL TROUBLESHOOTING GUIDE

2. MPEG CIRCUIT

Power is on

Does

Logo appear

on the screen?

YES

Does the

Video of the DVD Disc

play properly?

YES

Does the

Video of the video CD

play properly?

NO

NO

YES

NO

Check power & clock

YES

Is MPEG data error

signal normal?

YES

Is error

signal normal?

Is MPEG data error

signal normal?

NO

OK

NO

NO

Check CD/DVD DSP

output signal

OK

Check MPEG decoder

input signal

Check CD/DVD DSP

output signal

YES

Check MPEG decoder

input signal

Check CD/DVD DSP

output signal

OK

OPTION

If included VCD function.

Does

the audio sound output

normally?

YES

END

NO

Is Clock normal?

YES

Does the audio

signal output from MPEG

decoder?

YES

3-5

Check MPEG decoder

input signal

NO

Check clock signal

NO

Check clock signal