LG DP471B, DP472B, DP473B Service manual

MODEL : DP471B/DP472B/DP473BSERVICE MANUAL

Internal Use Only

Website http://biz.lgservice.com

PORTABLE DVD

SERVICE MANUAL

MODEL : DP471B/DP472B/DP473B

P/NO : AFN73065036 APRIL, 2009

CAUTION

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

CONTENTS

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

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

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

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

1-1

LGE Internal Use Only

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

LGE Internal Use Only

1-2

Only for training and service purposes

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.

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LGE Internal Use Only

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.)

LGE Internal Use Only

1-4

Only for training and service purposes

SPECIFICATIONS

• DVD PLAYER

Power requirements DC 9 ~ 15V

Power consumption 13W

External dimensions 202 x 44 x 165mm (W x H x D)

Net weight (Approx.) 0.82kg

Operating temperature 0°C to 45°C

Operating humidity 0% to 60%

Laser semiconductor laser

Signal system PAL/NTSC

• CONNECTORS

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

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

- Audio: 2Vrms (1kHz, 0dB)

Earphone terminal ø3.5mm stereo mini jack x 2

USB 2.0 Type:A

• LIQUID CRYSTAL DISPLAY

Panel size 7inches wide (diagonal)

Projection system R.G.B. stripe

Driving system TFT active matrix

Resolution 480 x 234 (WQVGA)

• SUPPLIED ACCESSORIES

RCA Video/Audio cable

AC Adapter (MPA-630)

Automotive Adapter (Cu-2993)

Remote Control

Battery for Remote Control (Lithium Battery)

1-5

LGE Internal Use Only

MEMO

LGE Internal Use Only

1-6

Only for training and service purposes

SECTION 2

EXPLODED VIEWS

CONTENTS

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

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

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

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LGE Internal Use Only

LCD

BOARD

LCD

PANEL

MAIN

BOARD

475

279

278

277

476

277

477

474

271

477

251

272

A48

A40

262

264

475

263

260

262

809

265

282

289

284

287

283

288

290

286

285

478

280

281

280

475

A44

A00

A53

A46

A43

A52

A51

CABLE3

SVC purchase order caution

Cables must be ordered assembly part. Supply is possible in Location No. 278, A40 and A53.

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION

LGE Internal Use Only

2-2

Only for training and service purposes

2. PACKING ACCESSORY SECTION

803

PACKING

839

PLUG ASS'Y(RCA CABLE)

806

834

ADAPTER

833

REMOTE CONTROL

900

CARRING CASE

BOX

802

801

OWNER'S MANUAL

CABLE, CIGAR JACK

804

PACKING SHEET

835

CAR-MOUNT

808

BATTERY

2-3

LGE Internal Use Only

MEMO

LGE Internal Use Only

2-4

Only for training and service purposes

SECTION 3

ELECTRICAL

CONTENTS

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

1. POWER CHECK FLOW ........................................................................................................................3-2

2. SYSTEM OPERATION FLOW ...............................................................................................................3-3

3. SYSTEM TEST FLOW ...........................................................................................................................3-4

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ................................ 3-11

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

2. SDRAM CLOCK ...................................................................................................................................3-11

3. TRAY OPEN/CLOSE SIGNAL .............................................................................................................3-11

4. SLED CONTROL RELATED SIGNAL .................................................................................................3-12

5. LASER POWER CONTROL RELATED SIGNAL ................................................................................ 3-13

6. SPINDLE CONTROL WAVEFORM .....................................................................................................3-13

7. FOCUS ON WAVEFORM ....................................................................................................................3-14

8. TRACKING CONTROL RELATED SIGNAL(SYSTEM CHECKING) ................................................... 3-15

9. VIDEO OUTPUT WAVEFORM ............................................................................................................3-16

10. AUDIO OUTPUT ..................................................................................................................................3-16

WIRING CONNECTION DIAGRAM ....................................................................................................3-17

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

1. OVERALL BLOCK DIAGRAM .............................................................................................................3-18

2. SYSTEM BLOCK DIAGRAM ...............................................................................................................3-19

3. DC BLOCK DIAGRAM .........................................................................................................................3-20

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

1. LCD I/F CIRCUIT DIAGRAM ...............................................................................................................3-21

2. OPU CIRCUIT DIAGRAM ....................................................................................................................3-23

3. HP/SPK AMP CIRCUIT DIAGRAM ......................................................................................................3-25

4. AUDIO I/F CIRCUIT DIAGRAM ...........................................................................................................3-27

5. MOTOR DRIVE CIRCUIT DIAGRAM ..................................................................................................3-29

6. MEMORY CIRCUIT DIAGRAM............................................................................................................3-31

7. MPEG CIRCUIT DIAGRAM ................................................................................................................. 3-33

8. VIDEO CONTROLER CIRCUIT DIAGRAM .........................................................................................3-35

9. AV I/F CIRCUIT DIAGRAM ..................................................................................................................3-37

10. USB I/F CIRCUIT DIAGRAM ...............................................................................................................3-39

11. LCD POWER CIRCUIT DIAGRAM ......................................................................................................3-41

12. MPEG POWER CIRCUIT DIAGRAM .................................................................................................. 3-43

13. INPUT POWER CIRCUIT DIAGRAM ..................................................................................................3-45

14. B/L POWER CIRCUIT DIAGRAM ........................................................................................................3-47

15. CHARGER POWER CIRCUIT DIAGRAM ........................................................................................... 3-49

16. SWITCH & VIDEO BUFFER CIRCUIT DIAGRAM ..............................................................................3-51

CIRCUIT VOLTAGE CHART ...........................................................................................................3-53

PRINTED CIRCUIT BOARD DIAGRAMS ......................................................................................... 3-57

1. MAIN P.C. BOARD ..............................................................................................................................3-57

2. LCD P.C. BOARD ................................................................................................................................ 3-57

3-1

LGE Internal Use Only

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER CHECK FLOW

A. B.

No 1.8V

No 5V or 3.3V

3.3V section working?

YES

Replace C19,C23

YES

Replace U16

Check

VCC_ADP

YES

Replace

D5, Q11, Q16, Q19

LGE Internal Use Only

3-2

Only for training and service purposes

2. SYSTEM OPERATION FLOW

Power on

1. 8032 initializes SERVO,DSP & RISC registers

2. Write RISC code to SDRAM

3. Reset RISC

Show LOGO

Tray closed?

YES

1. Judge whether have disc and disc type

2. Jump to related disc reading procedure

Received

function key

1. Execute pressed Key & IR key

2. System operation routine loop

Tray at closed

position

Sled motor

at inner side?

SLED moves to inner position

Tray open

3-3

1. Stop playback & open Tray

2. Display tray open message & LOGO

LGE Internal Use Only

3. SYSTEM TEST FLOW

TEST Start

PCBA no short. Especially

Make sure

power block.

YES

Switch power on

the DC voltage correct?

DC 5V,3.3V,1.8V

YES

Flash upgrade

Repair short problem.

Repair DC output problem.

1. Check code version

2. Check Crystal clock is 27MHz

3. Check SDRAM clock.

4. Check reset circuit.

5. Check debug setting.

LGE Internal Use Only

3-4

Only for training and service purposes

RESET or power on.

LOGO

display?

YES

Plug AV-Cable in

LOGO

display on TV?

YES

NO NO

Check 8202T

Video out

YES

Check

video circuit

YES

Check cable &

connection wire.

YES

1. Check panel & panel board circuit.

2. Check TV system.

1. Check video relate setting of chip circuit.

2. Check Main chip.

Check component value.

Check open, short,

direction, pin definition.

3-5

LGE Internal Use Only

+ 35 hidden pages