LG LRM-519 Schematic

SERVICE MANUAL

LG LRM-519 DIGITAL MEDIA RECORDER

SERVICE MANUAL

MODEL : LRM-519(RV7922M)

CAUTION

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

MODEL : LRM-519(RV7922M)SERVICE MANUAL

P/NO : 3829RVN004L AUGUST, 2005

1-1

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS............1-2

SERVICING PRECAUTIONS ....................................................................................1-3

INTRODUCTION ......................................................................................................1-4

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

SYSTEM S/W UPGRADE.........................................................................................1-7

TEST S/W .................................................................................................................1-8

1-2

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 Zenith Electronics 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 Zenith Electronics 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 is not delayed until the new service literature is printed.

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

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

A.C. Voltmeter

Good Earth Ground such as the Water Pipe, Conduit, etc.

0.15uF

1500 OHM

10 WATT

Place this probe on each exposed metal part.

1-3

SERVICING PRECAUTIONS

CAUTION: Before servicing the HD/SD PERSONAL VIDEO RECORDER & RECEIVER WITH GEMSTAR 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 publications, always follow the safety precautions.

Remember Safety First:

General Servicing Precautions

1. Always unplug the HD/SD PERSONAL VIDEO

RECORDER & RECEIVER WITH GEMSTAR 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 elec-

trolytic 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 HD/SD PERSON-

AL VIDEO RECORDER & RECEIVER WITH GEMSTAR 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 HD/SD PERSONALVIDEO

RECORDER & RECEIVER WITH GEMSTAR 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

INTRODUCTION

- MSDVR & DVD Recorder receives the analog NTSC or cable broadcasting and compresses the audio and video file into the MPEG format to save on HDD or record on DVD. It supports the additional service of EPG (Electronics Program Guide) provided from MS.

Configuration

For the CPU, Intel Celeron 733 of x86 is used and for peripheral chips, CPU I/F, Memory I/F and North Bridge and system parts for the North Bridge part that supports PCI I/F, IDE I/F serial I/F and USB I/F for graphics function are used. The Audio/Video signal received from the tuner or external input is compressed through the MPEG Encoder and saved on HDD to be decoded by the CPU for display and if needed, saved on DVD. Download or upgrade the MS EPG software through Ethernet and MODEM. The file can be shared with Windows XP PC through Ethernet or USB I/F WiFi device. It can be connected to an external HDD, Memory Card Reader, Memory Stick or WiFi device through USB I/F.

• System Part

- CPU : Celeron 733(Low Voltage)

- North Bridge : 830

- System Memory : SDRAM 128MByte

• MPEG-2 Encoder Part

- MPEG-2 Encoder : CX23418

- PCI I/F ,Video Decoder/ Audio Processor

• Interface Part

- South Bridge : ICH4

- IDE I/F: HDD, DVD±RW

- Super I/O

- Ethernet

- MODEM

- USB 2.0

• Audio/Video In/Out Part

- Tuner

- Video Out

- Audio CODEC

1-5

SPECIFICATIONS

Television System NTSC, Analog American Standard (480i) Channel Coverage Unscrambled Air/Analog CATV 1-135 Draft Specification

NTSC Reception 1. Terrestrial (ANT/Analog)

2. Cable (CABLE/Analog) DVD±R/W USB 2.0 Network 1. Ethernet(10/100)

2. Modem(56kbps) HDD(160GB)

DVD ± R/W Specifications

DVD DVD-ROM : 4.7GB (Single Layer)

8.5GB (Dual Layer)

DVD-R : 4.7GB (Ver. 2.0 for Authoring : R & W)

4.7GB (Ver. 2.0 for General: read & write ) DVD-RW : 4.7GB (Ver. 1.1 read & write) DVD+R : 4.7GB/side (Ver. 1.1 read & write) DVD+RW : 4.7GB/side (Ver. 2.1 read & write)

CD CD-ROM Mode-1 data disc

CD-ROM Mode-2 data disc CD-ROM XA, CD-I, Photo-CD Multi-Session, Video CD CD-Audio Disc Mixed mode CD-ROM disc (data and audio) CD-Extra, CD-Text CD-R (Conforming to “Orange Book Part 2”: read) CD-RW (Conforming to “Orange Book Part 3”: read)

Inputs/Output

RF Input Air/Cable TV (1) RF Output Out To TV (1) (Loop Out) Component Video Output Component Out (1), RCA Jack connector 480p,480i -> YPbPr S-Video Output simultaneous Out with CVBS

S-Video Out (1), 4-pin Mini-DIN

Composite Video Output Video Out, RCA Jack connector (1-Port)

Simultaneous Out with S-video

Video Output Selection Switch 480i -> Composite

480i,480p -> Component Selection

Video In 480i Composite NTSC

Video In with L/R in(2), RCA Jack connector

S-Video In S-Video In, 4-pin Mini-DIN Audio out L/R Out(2),SPDIF Out(1: Optical, 1: Coaxial) USB USB2.0(2-Port) Ethernet 10BASE-T/100BASE-T, RJ45(1) Modem 56kbps Data Modem, RJ11(1) VCR/Cable Box Control IR Expender(1), Phone Jack Serial(1)

Chassis Size 430mm(W) x 300mm(D) x 59mm(H)

1-6

* DVR – Recording & Scheduling

• Instant recording / Series recording / Manual recording

• Conflict management

• Duplicate checking (recognize and ignore reruns and repeats)

* DVR - Live TV

• 90 minutes buffer

• Recording Pause buffer

• Buffers live TV while playing a recorded TV program

* DVR - Playback

• Skip ahead : 30 seconds

• Instant Replay : 7 seconds

• Multi speed FF & RW : 3 speed (3x,40x,250x)

• Slow motion : FWD 1/2x

• Frame advance

* DVR – etc.

• DVR functionality can work while DVD burning in progress

• Arrange recorded shows into folders

* Program Guide & Search

• Guide data : 14 days premium service

• Guide date source : dialup or broadband

• Combines channel guides from multiple sources

• Channel filtering

• Search by Title, Category, Topic (keyword)

* DVD - Recording

• Disc Compatibility DVD-R/DVD-RW, DVD+R/DVD+RW, Double layer Not support VR mode recording

• DVD burning speed : x4

• Copy programs to DVD

• Create the DVD top menu and program info submenu

• Auto chapter marking : every 10 minutes

• Record shows to DVR while burning a DVD

• Use the box’s other functions during burning process

* DVD - Playback

• Disc Compatibility DVD-Video, DVD-R/DVD-RW, DVD+R/DVD+RW DVD-/+RW Audio CD, CD-R, CD-RW

• Play a DVD or CD

• Angle/Subtitle selection, change audio language

• DVD playback while recording/buffering

* Photo & Music

• Digital photo slideshow

• Play music

• Photo slideshows while playing music

* Networking

• Fetch guide data over broadband

• 802.11 a/g wireless USB adaptor support

Vender and model name ?

* Other Features

• Video On Demand(V1.1)

• Software update

• USB memory card reader support

1-7

SYSTEM S/W UPGRADE

1. ON-LINE S/W UPGRADE METHOD

- The software can be upgraded by connecting with Ethernet or MODEM. Main Menu -> settings -> guide set-up -> ???

The softwares that can be upgraded online are as follows.

- Main S/W

- Bootloader

- DVD Firmware

2. SYSTEM INFORMATION

In this menu, you can check the version, Box ID and basic system information of all the softwares used in the

system.

You can check this information in Main menu-> Settings -> System Information.

The information that can be checked is as follows.

- Main S/W version

- Bootloader version

- DVD Firmware version

The information that can be checked.

- Service ID

- Network Information

- Uptime: Power up time

- BR: Bit rate indication

- CPU temperature

1. TEST METHOD USING THE DEBUG BOARD

There are two test methods when there is an issue with the main board. When it is not properly booted and the composite video is not displayed, you can check the status of the board using the Debug Board for debugging prepared in the Debug port of the main board.

The Debug Board is composed as follows.

- 7-Segment that indicates the board status

- The connector interfacing the Debug port

- Boot ROM for testing: Not used.

How to use the Debug Board The Debug Board is connected to the J802 of the main board.

Error code indicated on the Debug Board

1-8

TEST S/W

Eth

G-

K4 K4K4 K4

ern

L81

CX2

2 8

FS4

AuViAu

830

Cele

S6 S6S6 S6

J802

1-9

During L2 cache initialization, the processor is running at a faster or slower bus frequency than it is designed for. This is a fatal error, and the processor will be halted. Detected during cache initialization.

No memory was detected during the memory initialization. This is a fatal error, and the processor will be halted.

Unsupported memory was detected during the memory initialization. This is a fatal error, and the processor will be halted.

An invalid timing configuration was detected (e.g. 66 MHz SDRAM with a 100 MHz host bus frequency).

Both registered and unregistered DIMMs were detected.

An unsupported memory configuration was detected.

The stack was located above 1 Mbyte when attempting to switch to real mode by a call to the sflDone16 API.

The detected amount of memory does not match the SPD data. Unsupported The host bus frequency is not supported. The requested integrity mode is not supported by the Hardware. Board initialization(SIO, GPIO(A/V Mute) etc.) Prepare to handle interrupts initialize caching and shadow ROM to RAM Super I/O initialization Initialize local keyboard if present initialize A TA chipset pci resource allocation board specific resource allocation hook enable memory and i/o address decoding for pci devices Standard legacy services setup initialize memory map Setup the graphics mode for 830M

System Bus Frequency Mismatch

No Memory Detected

Unsupported Memory Type

Unsupported Timing

Mixed Registered/ Unregistered DIMMs

Unsupported Memory Configuration

Invalid Real Mode Stack

SPD and Memory Mismatch Host Bus Frequency Integrity Mode Unsupported board init interrupt init Cache init SIO init keyboard init ATAinit csPciAlloc boardResourceAlloc pciEnableDecode lgcyInitSvcs mmapinit board video init

0x30

0x31

0x32

0x33

0x34

0x35

0x36

0x37 0x38 0x3A 0x20 0x21 0x22 0x23 0x25 0x26 0x27 0x28 0x29 0x2A 0x22 0x2F

BOOTLOADER ERROR/STATUS CODE

Code Name Interpretation/Description

1-10

2. BOARD TEST METHOD USING THE JIG SET

Diagram of JIG test composition For the JIG set, use the RV7922M set excluding the main board and HDD.

When using the set for JIG, you must use the Debug Board. You must use the HDD for JIG.

Because of the software protection policy of MS, the service man cannot include the self diagnosis software for troubleshooting on the mass produced HDD. Therefore Boot ROM and HDD are separately needed to repair the board. The MS software policy is configured to only allow the Signed Image to be operated on the Signed Boot ROM.

VD Loader

Power

Main Board

HDD

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

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

1. Cabinet and Main Frame Section...........................................................................................2-2

2. Deck Mechanism Section(RL-05)...........................................................................................2-3

2-2

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION

BCD

463

250

462

463

A47

463

A46

462

A60

205

469

457

473

A26

472

204

471

473

203

474

202

201

474

A26A

472

471

465

263

264

A44

266

457

261

267

452

280

A43

A50

283

261

260

2-3

2. DECK MECHANISM SECTION(RL-05)

1434

1026

1435

1015

1003

1005

1016

1001

1013

1014

A001

1002

1434

1012

1019

1011

1009

1038

1024

1432

1029

1019

1025

1027

1020

1433

1437

1029

1432

1033

1021

A60

A000

1030

1025

1027

1432

1032

1432

1017

A004

1436

1018

1018A

1018B

1018C

1018E

1018D

1042

1434

1006

1041

A002

1434

3-1

SECTION 3

ELECTRICAL

CONTENTS

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

1. POWER(SMPS) CIRCUIT ........................................................................................................................3-2

2. SYSTEM PART CIRCUIT .........................................................................................................................3-3

3. VIDEO PART-1..........................................................................................................................................3-5

4. YPBPR VIDEO OUTPUT TROUBLESHOOTING.....................................................................................3-6

5. S-VIDEO VIDEO OUTPUT TROUBLESHOOTING..................................................................................3-7

6. CVBS VIDEO OUTPUT TROUBLESHOOTING.......................................................................................3-8

7. AUDIO TROUBLESHOOTING..................................................................................................................3-9

8. TUNER TROUBLESHOOTING...............................................................................................................3-10

9. ETHERNET TROUBLESHOOTING........................................................................................................3-11

10. MODEM TROUBLESHOOTING...........................................................................................................3-12

11. DVD TROUBLESHOOTING..................................................................................................................3-13

12. IR BLASTER TROUBLESHOOTING ....................................................................................................3-14

13. SERIAL (RS-232) TROUBLESHOOTING.............................................................................................3-15

WAVEFORMS ..................................................................................................................................................3-16

1. SYSTEM PART-1 ....................................................................................................................................3-16

2. SYSTEM PART-2 ....................................................................................................................................3-17

3. VIDEO PART-1........................................................................................................................................3-18

4. VIDEO PART-2........................................................................................................................................3-19

5. VIDEO PART-3........................................................................................................................................3-20

6. VIDEO PART-4........................................................................................................................................3-21

7. AUDIO PART -1........................................................................................................................................3-22

8. AUDIO PART -2........................................................................................................................................3-23

9. AUDIO PART -3........................................................................................................................................3-24

10. ETHERNET PART ............................................................................................................... .................3-25

11. SUPER IO & FRONT INTERFACE PART.............................................................................................3-26

BLOCK DIAGRAMS........................................................................................................................................3-27

1. TOTAL BLOCK DIAGRAM......................................................................................................................3-27

2. WRING BLOCK DIAGRAM.....................................................................................................................3-28

3. POWER BLOCK DIAGRAM ...................................................................................................................3-29

4. SIGNAL PATH BLOCK DIAGRAM..........................................................................................................3-30

5. BLOCK DIAGRAM..................................................................................................................................3-31

CIRCUIT DIAGRAMS......................................................................................................................................3-32

1. POWER(SMPS) CIRCUIT DIAGRAM ....................................................................................................3-32

2. POWER CIRCUIT DIAGRAM.................................................................................................................3-34

3. CPU CIRCUIT DIAGRAM.......................................................................................................................3-36

4. GMCH CIRCUIT DIAGRAM ....................................................................................................................3-38

5. ICH4 CIRCUIT DIAGRAM ......................................................................................................................3-41

6. CLOCK & LPC CIRCUIT DIAGRAM .......................................................................................................3-42

7. MEMORY/IDE CIRCUIT DIAGRAM........................................................................................................3-44

8. LAN/USB/MODEM CIRCUIT DIAGRAM ................................................................................................3-46

9. VIDEO CONVERTER & AC97 CODEC CIRCUIT DIAGRAM ................................................................3-48

10. MPEG-II ENCODER & AV DECODER (CX23418) CIRCUIT DIAGRAM.............................................3-50

11. TUNER & EXTERNALAV INPUT CIRCUIT DIAGRAM........................................................................3-52

12. AUDIO/VIDEO INPUT INTERFACE CIRCUIT DIAGRAM ....................................................................3-54

13. MISCELLANEDUS CIRCUIT DIAGRAM ..............................................................................................3-56

14. EXTERNAL I/F CIRCUIT DIAGRAM ....................................................................................................3-58

PRINTED CIRCUIT DIAGRAMS.....................................................................................................................3-60

1. MAIN PRINTED CIRCUIT DIAGRAMS(TOP VIEW) ..............................................................................3-60

2. MAIN PRINTED CIRCUIT DIAGRAMS(BOTTOM VIEW) ......................................................................3-62

3. KEY PRINTED CIRCUIT DIAGRAM.......................................................................................................3-64

4. TIMER PRINTED CIRCUIT DIAGRAM...................................................................................................3-64

5. POWER PRINTED CIRCUIT DIAGRAM ................................................................................................3-66

3-2

ELECTRICAL TROUBLESHOOTING GUIDE

Proper display port select

Video Input Cable connection OK

1. POWER(SMPS) CIRCUIT

Power cable connection

Front Signal Cable Connection OK

“HELLO” display on VFD OK

“LG logo” display on Monitor OK

Front signal cable connect

Front Power Cable Connection OK

Front power cable connect

Display Cable Connection OK

Display Cable Connect

Display Port Selection (S800) OK

HDD Image upgrade

Audio Cable Connection OK

Audio Cable

Connect

YES

YESYES

YES

“CH No. & DATE” display on VFD OK

Audio OK

Video OK

Normal TV Function OK

3-3

2. SYSTEM PART CIRCUIT

Power Cable Connection Power on

LED801 “ON” OK

“LG logo” display on Monitor OK

system function OK

Check soldering state of Board

C919 +1.25V OK

IC900 change

IC900 (1-Pin) +12V OK

Q909 (2-Pin) Low=0V OK

IC902 change

X100 change

X300 14.318MHz OK

IC301 change

IC301 (24-Pin) 66MHz OK

IC301 change

J900 Connector Power Cable Check

IC914 change

YES

C930 +1.15V OK

X100 32.768KHz OK

IC301(49-pin) 133MHz OK

YES

IC301(10-pin) 33MHz OK

YES

X300 change

R179,C210 Resoldeing

3-4

IC302(74-pin) High=+3.3V OK

IC300(24-pin) High=+3.3V OK

IC302(63-pin) High=+3.3V OK

Check IC104

R326 Re-soldering

HDD Cables Re-connection

R377, J302 Re-soldering

IC302 change

HDD Cables Connection OK

IC302(64-pin) High=+3.3V OK

Change HDD

YESYES

YES

3-5

3. VIDEO PART-1

No display

IC302(73-pin) ‘3.3V’=high OK

IC501(53-pin) ‘3.3V’= high OK

IC501(63-pin) 27MHz clock in OK

IC501(51,54-pin) Clock in OK

IC302 change

OSC500 change

Re-soldering

R373 Re-soldering

YES

OSC500(3-pin) 27MHz clock out OK

YES

R508 Re-soldering

IC103 check

IC501(44,45-pin) I2C BUS OK

IC501(56-pin) Clock out OK

Q504,Q505, R532 ~ R535 soldering OK

IC103 check

IC501 change

R521 ~ R524, L500 ~ L503 Soldering OK

Re-soldering

C544 ~ C547,C560 ~ C563 Soldering OK

Re-soldering

Video Part OK

YES

3-6

4. YPBPR VIDEO OUTPUT TROUBLESHOOTING

No display

Cable connect

Video Cable connection OK

S800 status OK

IC510(3,5-pin) Video signal input OK

IC509,510 (8-pin) +5V OK

S800 setting 480i or 480p

Video Part-1 check

Q815, R881 ~ 883, R839 Check

Re-soldering

YES

IC509(3-pin) Video signal input OK

IC803 (4-pin) Under +2.5V OK

IC803 Check

IC509,510 (4-pin)

-5V OK

IC509(1-pin) IC510(1,7-pin) Video signal output OK

R774, R775, FL510, FL512 Soldering OK

YPbPr Video Output OK

NONO

J900 (3-pin) check

R740, R742, R745, R746, R762, R765, R758 ,R759 soldering OK

IC510 Check

R738, R741,R743, R744 soldering OK

Re-soldering

IC509 Check

Re-soldering

Video Part-1 check

3-7

5. S-VIDEO VIDEO OUTPUT TROUBLESHOOTING

No display

Cable connect

Video Cable connection OK

YES

S800 setting CVBS

S800 status OK

YES

Video Part-1 check

IC508(3,5-pin) Video signal input OK

YES

IC803 (4-pin) Under +2.5V OK

IC803 Check

J900 (3-pin) check

R731, R732, R733, R734 soldering OK

IC508 Check

R735, R736, R737, R739 C652, soldering OK

IC508 Check

Re-soldering

IC508 (8-pin) +5V OK

IC508 (4-pin) -5V OK

IC508(1,7-pin) Video signal output OK

R774, R775, FL510, FL512 Soldering OK

S-Video Video Output OK

Q815, R881~883, R839 Check

Re-soldering

YES

3-8

6. CVBS VIDEO OUTPUT TROUBLESHOOTING

No display

Cable connect

Video Cable connection OK

YES

S800 setting CVBS or 480i

S800 status OK

YES

Video Part-1 check

IC509(5-pin) Video signal input OK

YES

IC803 (4-pin) Under +2.5V OK

IC803 Check

J900 (3-pin) check

R756, R757, R761, R764 soldering OK

IC509 Check

Re-soldering

IC509 (8-pin) +5V OK

IC509 (4-pin) -5V OK

IC509(7-pin) Video signal output OK

R780,FL516 Soldering OK

CVBS Video Output OK

Q815, R881~883, R839 Check

Re-soldering

YES

3-9

7. AUDIO TROUBLESHOOTING

Audio output

problem

IC104 Soldering Check

IC500 (11-pin) High = “1” OK

YES

System part check

IC500 (5, 6, 10-pin) Clock / Data / Sync Input Check

YES

IC500 (1, 9-pin) +3.3V out OK

IC500 (2, 3-pin) 24.576MHz clock In/Out OK

YES

IC500 (25, 38-pin) +5.0V out Check

IC500 soldering

Check

IC502 (8-pin) +8.0V input OK

R528, R529 C554, C555 Soldering OK

F509, F511, F517, F518 Soldering OK

Audio Output OK

IC502 (1, 7-pin) Audio out OK

B504 soldering OK

Re-soldering

J900 Connector Power Cable Check

B506 Soldering Check

Re-soldering

YES

J900 Connector Power Cable Check

YES

Re-soldering

3-10

8. TUNER TROUBLESHOOTING

Tuner problem

IC803 (4-pin) Under +2.5V OK

TU500(2,6-pin) +5V Input OK

Q815, R881~883, R839 Check

YES

IC803 Check

J900 (2-pin) Check

TU500(8-pin) +30V Input OK

YES

R651,652,724, 725 Soldering Ok

IC513 Check

J900 (2-pin) Check

Tuner OK

R651, 652, 724, 725 Re-soldering

YES YES

3-11

9. ETHERNET TROUBLESHOOTING

Ethernet problem

Network Cable Connect

Network Cable Connection OK

YES

MAC Address Check OK

Network Setup Check OK

Forwarding Factory

YES

Network Re-Setup

IC308 (60, 61-pin) 25 MHz Clock In/Out OK

IC905 (2, 4-pin) +3.3V out OK

IC308 (51, 96-pin) +2.5V out OK

IC308 soldering Check

IC310 (8-pin) +3.3V input OK

IC310 Change

IC310 Re-soldering Or Change

IC310 (1,2,3,4-pin) Clock/DataOK

IC310 (67, 68, 71, 72-pin) Output OK

Ethernet OK

IC905 (3-pin) +5.0V out OK

J900 Connector Power Cable Check

YES

Q304 soldering OK

J900 Connector Power Cable Check

YES

J900 Connector Power Cable Check

Re-soldering

3-12

10. MODEM TROUBLESHOOTING

No Dial-up connection

Connection Phone line

YES

IC905 Check

IC307 (5,21-pin) +3.3V input OK

J304(between 3,and 4 Pin) 40~52V OK

Phone Line Check

YES

IC304 (3-pin) Clock Out 2048KHz OK

DTE Setup & Connection (8-bit, no parity bit, one stop bit and 19.2kbps)

IC304 (1-pin) Clock Input 27MHz OK

Re-soldering IC304

Check IC309 Refer to Fig 7-10 OK

Change IC309

“AT” Response OK

Modem OK

Check OSC500

Re-soldering IC309

YES

~ ~

< Fig 7-10. IC309 Typical Voltage >

0V 0V 0V 0V

0.8V

0.7V

2.3V

1.0V

-- QE

-- DCT

-- RX

-- IB

-- C1B

-- C2B

-- VREG

-- RNG1

ON-HOOK

VREG2 --

DCT2 --

IGND --

DCT3 --

QB --

QE2 --

SC --

RNG2 --

0V 0V

0V 0V 0V 0V ~1.0V

1.6V

3.4V

2.5V 0V

0.8V

2.3V

1.0V

OFF-HOOK

-- QE

-- DCT

-- RX

-- IB

-- C1B

-- C2B

-- VREG

-- RNG1

DCT2 --

IGND --

DCT3 --

QB --

QE2 --

SC --

VREG2 --

RNG2 --

2.2V 0V

1.6V

2.8V

2.1V 0V

1.8V

0.9V

3-13

11. DVD TROUBLESHOOTING

DVD problem

DVD Loader Power-On OK

YES

YES YES

Front Panel Open/ Close Key Check OK

DVD Tray Open/ Close Check OK

Front Panel Check

J902 Connector Power Cable Check

J303 Connector FFC Cable Check

YES

DVD Auto-Loading OK

DVD Region Code Check OK

DVD Problem

DVD Video Check OK

DVD Audio Check OK

DVD Play Check OK

DVD OK

DVD Disc Check

Video part Check

Audio part Check

YES

3-14

12. IR BLASTER TROUBLESHOOTING

IR Blaster Problem

Setting IR Blaster Configuration

YES

YES YES YES

J804(2-pin) “FLD_ CLK” Present OK

R859 IR Signal Present OK

Check IC302 & Re-soldering

J804(4-pin) “FLD_ RXD” Present OK

IR Blaster Operation OK

J804(3-pin) “FLD_ TXD” Present OK

Change Front-Board

YES

3-15

13. SERIAL (RS-232) TROUBLESHOOTING

Serial (RS-232) Problem

Serial Cable Connection OK

YES

J900 Connector Power Cable Check

IC805(16-pin) +5V Input OK

YES

Check IC302 & Re-soldering

J805(11-pin) “TX Data” Present OK

YES

Check IC805 & Re-soldering

B805 Re-soldering

J805(14-pin) “TX Data” Present OK

J805(13-pin) “RX” Present OK

YES

J805(12-pin) “RX Data” Present OK

YES

Serial (RS-232) OK

Serial Cable Connect

3-16

WAVEFORMS

1. SYSTEM PART-1

+ 128 hidden pages