LG DP481B, DP482B Service manual

MODELS : DP481B/DP482BSERVICE MANUAL

Internal Use Only

Website http://biz.lgservice.com

PORTABLE DVD

SERVICE MANUAL

MODELS : DP481B/DP482B

P/NO : AFN73065035

CAUTION

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

APRIL, 2009

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

FIRMWARE UPGRADE METHOD ................................................................................................................. 1-5

SPECIFICATIONS ............................................................................................................................................ 1-7

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

FIRMWARE UPGRADE METHOD

Please follow below process to download a program with disc

Advanced Preparation: USB, update file (target.bin) and platform.

Process:

1. Turn on the Portable DVD player.
(Note: Be sure that there is no disc in PDVD)

2. Press “SETUP” button on remote control.

3. Choose a “display” menu by using the cursor but­ton and then choose a “TV Aspect” menu.

And choose “16:9” menu.

< FIGURE 1. Progress to check system information >

4. Press the 1 → 3 → 9 → 7 → 1 → 3 → 9(numberial
button) → Enter key on remote control to confirm
the system information.

6. Change the program file name of new version to
the model name

Ex> New ver. Program file →
LG_DV_LP930F700082MY.ROM
Model name → LG_DV_LP930F700082MY
Change New ver. program file like this →
LG_DV_LP930F700082MY.ROM
If you don’t change the file name like that, Disc

download isn’t be worked.

7. Copy the changed file to a USB memory stick.

Note: the file must be at the root directory of USB.

8. Insert the copied USB memory stick to PDVD.

9. Press the MODE button on the PDVD-player.

10. Select USB mode.

5. Remember or write the model name.

< FIGURE 2. System information before update >

< FIGURE 3. Select the USB mode >

11. If the below picture appears on the screen, Select
“Start” and Press “UP” button on Remote control­ler. While this menu appears, please don’t eject

disc or take out USB

< FIGURE 4. System update mode interface >

1-5

12. After the below picture appears on the screen, New
PDVD program will download from USB memory
stick automatically.

Do not take out USB memory stick.

< FIGURE 5. System updating >

13. After USB download is completed, PDVD-player
displays below picture automatically.

15. Select the initial Language and press “Enter” but­ton. Then, Select “Enter” and press “Enter” button.

< FIGURE 7. Select initial language >

16. Do it again the progress 1, 2, 3, 4 to confirm the
version.

< FIGURE 6. System returns to MENU LANGUAGE
select interface >

14. Remove the USB memory stick.

FIGURE 8. Check the system information after updated >

1-6

SPECIFICATIONS

• GENERAL

Power requirements DC 9V

Power consumption 12W

External Dimensions 221 x 32.7* x 175mm (W x H x D)

(*based upon the front side)

Net Weight (Approx.) 1.08kg

Operating temperature 0°C to 40°C

Operating humidity 5% to 90%

Laser Semiconductor laser

Signal system NTSC / PAL

• CONNECTORS

Audio/Video Output ø3.5mm mini jack x 1

- Video: 1.0V (p-p), 75Ω, sync negative

- Audio: 2.0Vrms (1kHz, 0dB)

Earphone terminal ø3.5mm stereo mini jack x 2

USB IN 4 pin (USB 2.0 / 1.1 standard)

• LIQUID CRYSTAL DISPLAY

Panel size 8.5 inches wide (diagonal)

Projection system R.G.B. stripe

Driving system TFT active matrix

Resolution 480 x 234 (WQVGA)

1-7

MEMO

1-8

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

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION

E

D

A00

265

266

266

266

F

C

B

A46

G

F

CABLE2

276

260

263

264

A42

269

272

MAIN

BOARD

J

I

H

809

475

USB

279

486

476

BOARD

E

D

278

J

I

H

G

CABLE1

486

282

271

262

A43

264

261

474

264

474

A44

475

A48

281

268

281

477

277

275

259

A52

254

272

253

252

250

270

259

257

274

258

251

475

276

267

A40

A

LCD

280

475

B

C

A51

280

A

LCD/KEY

BOARD

273

255

485

257

475

256

2-2

2. PACKING ACCESSORY SECTION

806

808

834

900

833

835

801

804

803

839

802

802A

X

2-3

MEMO

2-4

SECTION 3

ELECTRICAL

CONTENTS

LCD PART .......................................................3-2

LCD ELECTRICAL
TROUBLESHOOTING GUIDE

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

2. BJT AMPLIFIER FOR RGB

VIDEO CIRCUIT ...........................................3-2

3. IR REMOTE CONTROL CIRCUIT ...............3-2

...................3-2

BLOCK DIAGRAM ........................................3-3

CIRCUIT DIAGRAMS ...................................3-5

1. LCD TFT DRIVE CIRCUIT DIAGRAM .........3-5

2. KEYPAD CIRCUIT DIAGRAM .....................3-7

CIRCUIT VOLTAGE CHART ......................3-9

PRINTED CIRCUIT BOARD
DIAGRAMS

....................................................3-11

MAIN PART ...................................................3-15

MAIN ELECTRICAL
TROUBLESHOOTING GUIDE

1. POWER (DC-DC CONVERTER)

CIRCUIT .....................................................3-15

2. MPEG CIRCUIT .........................................3-18

3. SERVO CIRCUIT .......................................3-19

4. CHARGEING CIRCUIT ..............................3-21

.................3-15

WIRING DIAGRAM ......................................3-28

BLOCK DIAGRAMS ...................................3-29

1. OVERALL BLOCK DIAGRAM-1 .................3-29

2. OVERALL BLOCK DIAGRAM-2 .................3-30

3. POWER BLOCK DIAGRAM .......................3-31

4. SERVO BLOCK DIAGRAM ........................3-32

5. SYSTEM BLOCK DIAGRAM ......................3-33

6. AV BLOCK DIAGRAM ................................3-34

CIRCUIT DIAGRAMS .................................3-35

1. CHARGE GT6312 CIRCUIT DIAGRAM .....3-35

2. MPEG CIRCUIT DIAGRAM ......................3-37

3. DC-DC & MOTOR & OPU

CIRCUIT DIAGRAM ...................................3-39

4. SDRAM & FLASH CIRCUIT DIAGRAM .....3-41

5. AUDIO & VIDEO OUTPUT

CIRCUIT DIAGRAM ...................................3-43

6. PANEL CIRCUIT DIAGRAM ......................3-45

CIRCUIT VOLTAGE CHART ....................3-47

PRINTED CIRCUIT BOARD
DIAGRAMS

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

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

....................................................3-51

DETAILS AND WAVEFORMS ON
SYSTEM TEST AND DEBUGGING

1. SYSTEM 27MHz CLOCK, RESET

SIGNAL. .....................................................3-22

2. SDRAM CLOCK .........................................3-23

3. TRAY OPEN/CLOSE SIGNAL ...................3-24

4. SLED CONTROL RELATED SIGNAL ........3-24

5. LASER POWER CONTROL

RELATED SIGNAL .....................................3-25

6. SPINDLE CONTROL WAVEFORM ...........3-25

7. FOCUS ON WAVEFORM ..........................3-26

8. TRACKING CONTROL

RELATED SIGNAL(System checking) .......3-26

9. 1389LP VIDEO OUTPUT WAVEFORM .....3-27

10. 1389LP AUDIO OUTPUT WAVEFORM .....3-27

.......3-22

3-1

LCD PART

LCD ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER CIRCUIT 2. BJT AMPLIFIER FOR RGB
VIDEO CIRCUIT

No LCD power

YES

XP701 or XP702

Is

OK?

YES

Check

MAIN BOARD

NO

Replace

XP701 or XP702

3. IR REMOTE CONTROL CIRCUIT

IR Remote control

abnormal

LCD

Display abnormal

YES

Is

Q701,Q702,Q703

OK?

YES

Is

XP701 or XP702

OK?

YES

Check MAIN

BOARD(MPEG)

NO

NO

Replace

Q701,Q702,Q703

Replace

XP701 or XP702

YES

Is

IR701 OK?

YES

Is

XP701 or XP702

OK?

YES

Check

MAIN BOARD

NO

NO

Replace IR701

Replace

XP701 or XP702

3-2

BLOCK DIAGRAM

TFT LCD

S

PL

SPL+/ -

SPR

SPR+/ -

STVL,CKV,OEV,OEH,STHL

,LED_EN,

Connecter

KEY1

KEY PAD

/ 2/ 3, SAM_KEY

R, G, B

BJT Amplifier

for RGB Vide

R, G, B

o

Connecter

IR

3. 3V, 5V, VGH/ L, VCOM, BL_VCC

3-3 3-4