LG RH4820W User manual

HDD/DVD RECORDER
SERVICE MANUAL
MODEL : RH4820W
(RH4820WVL)
MODEL : RH4820W(RH4820WVL)SERVICE MANUAL
P/NO : 3829RHP022D
APRIL, 2004
Printed in Korea
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.

CONTENTS
SECTION 1 . . . .SUMMARY
SECTION 2 . . . .CABINET & MAIN CHASSIS
SECTION 3 . . . .ELECTRICAL
SECTION 4 . . . .REPLACEMENT PARTS LIST

1-2
SECTION 1
SUMMARY
CONTENTS
NEW FUNCTIONS OF HDD/DVD-RECORDER................................................................. 1-2
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS.............. 1-3
SERVICING PRECAUTIONS .................................................................................................. 1-4
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SERVICE INFORMATION FOR EEPROM IC SETTING ................................................. 1-5
SPECIFICATIONS ...................................................................................................................... 1-6

1-3
NEW FUNCTIONS OF HDD/DVD-RECORDER
• SUMMARY OF PRODUCT
- RECORDING FUNCTION OF DVD-RW AND DVD-R SPECIFICATIONS
• DVD-RW: VIDEO MODE AND VR MODE RECORD AVAILABLE
• DVD-R :VIDEO MODE RECORD AVAILABLE
- RECORDING FUNCTION OF HDD
• TIMESHIFT
• HDD TO DVD DUBBING
• DVD TO HDD DUBBING
- DIGITAL DUBBING FUNCTION OF DV CAMCORDER BY USING DV TERMINAL (IEEE1394)
• RECORD, PLAY, FF/REW FUNCTION BY REMOTE CONTROL OF DV CAMCORDER
- DVD PROGRESSIVE PLAY RESPONSE
- VARIOUS FUNCTION RESPONSE OF DVD RECORDING (DISC NAVIGATION AND CONVENIENT PLAY,
EDIT FUNCTION)
- OUTSIDE INPUT AND TV RECORDING AVAILABLE
• RECORDING SCREEN QUALITY :VR(HQ, SQ, LQ), VIDEO(HQ, SQ)
- TV RESERVE RECORDING FUNCTION (AUTO MODE SETTING AVAILABLE FOR RECORDING IN
ACCORDANCE WITH THE REMAINING DISC SPACE IN RESERVATION)
SUMMARIZED EXPLANATION OF MAIN FUNCTION
• DVD RECORDING FUNCTION(VR MODE RECORD / VIDEO MODE RECORD)
1) VR MODE RECORD : MANUAL MODE RECORDING IN ACCORDANCE WITH VARIOUS EDITING
FUNCTION, REMAINING DISC SPACE AND PROGRAM TIME DVD-RW DISC RECORDED IN THE VR
MODE CAN BE PLAYED WITH A DVD PLAYER CORRESPONDING TO THE DVD-RW THERE IS ALSO
A PLAYER TO BE PLAYED THROUGH FINALIZING. FOR THE DVD-RW, RECORDING AND EDITING
IS AVAILABLE AT THE SAME DEVICE EVEN AFTER FINALIZING.
2) VIDEO MODE RECORDING : THERE IS NO EDITING FUNCTION SUCH AS VR MODE RECORDING
BUT VIDEO MODE RECORDING IS PLAYED IN A GAME DEVICE (FOR EXAMPLE, “PLAY STATION 2”)
WITH PC, DVD PLAY FUNCTION CORRESPONDING TO DVD PLAYER, CAR DVD, DVD-ROM. TO
PLAY IN ANOTHER DEVICE, FINALIZING IS REQUIRED. RECORDING, EDITING AND EDITING IS
NOT POSSIBLE AFTER FINALIZING. HOWEVER, RECORDING IS ALLOWED AT THE DVD-RW DISC
IF ERASING THE TITLE FINALLY RECORDED AFTER FINALIZING.
3) RECORDING MODE INITIALIZATION (A KIND OF FORMATTING): BEGINS INITIALIZATION AFTER
SELECTING RECORDING MODE AS VR OR VIDEO MODE BY USING INITIALIZATION FUNCTION OF
THE DISC SETTING MENU. INITIALIZES DEFAULT AS VR MODE FOR DVD-RW. RECORDS IT AS
VIDEO MODE WITHOUT INITIALIZATION FOR VIDEO MODE.
4) FINALIZE: BEGINS FINALIZE AT THE DISC SETTING MENU DURING STOP.
• HDD RECORDING FUNCTION
1) TIME SHIFT

1-4
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 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 haz-
ard. These components are indicated by the letter “x” included in their compo-
nent designators and are required to maintain safe performance. No deviations
are allowed without prior approval by LG 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 modi-
fications 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 tri-
angle is intended to alert the service personnel to the presence of
noninsulated “dangerous voltage” that may be of sufficient magni-
tude to constitute a risk of electric shock.
The pictorial representation of a fuse and its rating within an equi-
lateral 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 fol-
lowing:
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 par-
ticles.
4. Check for physical evidence of damage or deterioration to parts and compo-
nents, 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 TRANS-
FORMER 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 metal-
lic 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 consti-
tutes 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 tilt-
ed 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 cast-
ers 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 conse-
quences to home and family.
A.C. Voltmeter
1500 OHM
10 WATT
Place this probe
on each exposed
metal part.
Good Earth Ground
such as the Water
Pipe, Conduit, etc.
0.15uF
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

1-5
SERVICING PRECAUTIONS
CAUTION : Before servicing the HDD/DVD Recorder cov-
ered by this service data and its supplements and addends,
read and follow the SAFETY PRECAUTIONS. NOTE : if
unforeseen circumstances create conflict between the fol-
lowing servicing precautions and any of the safety precau-
tions in this publications, always follow the safety precau-
tions.
Remembers Safety First:
General Servicing Precautions
1. Always unplug the HDD/DVD Recorder AC power cord
from the AC power source before:
(1) Removing or reinstalling any component, circuit board,
module, or any other assembly.
(2) Disconnection 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 HDD/DVD
Recorder 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
whitch instruments covered by this service manual might
be equipped.
5. Do not apply AC power to this HDD/DVD Recorder and/or
any of its electrical assemblies unless all solid-state
device heat sinks are cerrectly installed.
6. Always connect test instrument ground lead to the
appropriate ground before connection 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 resis-
tance between each blade of the attachment plug and acces-
sible conductive parts (Note 1) should be more than 1M-
ohm.
Note 1 : Accessible Conductive Parts including Metal pan-
els, 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 compo-
nent or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known
earth ground. Alternatively, obtain and wear a commer-
cially 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 grouned-tip soldering iron to solder or unsolder
ES devices.
4. Use only an anti-static solder removal device. Some
solder removal devices not classified a “anti-static” can
generate electrical charges sufficient to damage ES
devices.
5. Do not use freon-propelled chemicals. These can
generate electrical charge sufficient to damage ES
devices.
6. Do not remove a replacement ES device from its protec
tive 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 elec-
tricity sufficient to damage an ES device.)

1-6
SERVICE INFORMATION FOR EEPROM IC SETTING
MICOM START
EEPROM ID CHECK
2 BYTE(B3,248,249)
ID OK?
OPTION DATA READ
5TIME & COMPARE
Y
e
s
N
AME HEX BINARY
O
PT1 11 00000000
O
PT2 50 00000000
O
PT3 10 00000000
O
PT4 00 00000000 (reserved)
O
PT5 00 00000000 (reserved)
O
PT6 00 00000000 (reserved)
W
RITE:OK EXIT:MENU,MP
M
OVE:< > EDIT : __
OPTION WRITE : OK (OK KEY IN)
M
ASK : R00 , EEP : R00 , (D10)
(
Each mask ,eeprom, It shows a development release
v
ersion.)
No
D
ETECT NEW EEPROM (OPTION EDIT SCREEN
)
OPTION CONFIRMATION MODE
P
ress the "CLEAR" key on the
R
emote controller and the "CH - " key
o
ne the Front Panel the same
t
ime, then it goes in to Tracking
i
nitial mode.
O
PTION condition of Present time
t
he CHECK There is a Possibility of
d
oing and the OPTION the REWRITE
i
t is possible.
*
** EEPROM INITIAL ***
- SETUP is displayed in the field if pressing the Front ch- & ch+ Key with the Remocon number "clear"
key pressed in the status of powering on.
- AUTO SEARCH is done since the initial screen of ACMS is serviced if powering on.
M
ICOM NORMAL
O
PERATION STAR
T
Y
e
s
No

1-7
SPECIFICATIONS
• GENERAL
Power requirements AC 110-240V, 50/60 Hz
Power consumption 40W
Dimensions (approx.) 430 X 69 X 377 mm (16.9 x 2.7 x 14.8 inches) (w x h x d)
Mass (approx.) 6.4 kg (14.1 lbs)
Operating temperature 5˚C to 35˚C (41˚F to 95˚F)
Operating humidity 5 % to 90 %
Television system PAL B/G colour system
Recording format PAL
• RECORDING
Recording format DVD VideoRecording, DVD-VIDEO
Recordable discs DVD-ReRecordable, DVD-Recordable
Recordable time DVD : Approx. 1 hour (HQ mode), 2 hours (SQ mode),
4 hours (LQ mode)
HDD : Approx. 20 hour (HQ mode), 40 hours (SQ mode),
80 hours (LQ mode)
Video recording format
Sampling frequency 27MHz
Compression format MPEG 2
Audio recording format
Sampling frequency 48kHz
Compression format Dolby Digital
• DVD SPECIFICATIONS
Laser system Semiconductor laser
Frequency response DVD (PCM 48 kHz): 8 Hz to 22 kHz, CD: 8 Hz to 20 kHz
Signal-to-noise ratio More than 100 dB
Harmonic distortion Less than 0.008%
Dynamic range More than 95 dB
• INPUTS
AERIAL IN Aerial input, 75 ohms
VIDEO IN 1.0 Vp-p 75 ohms, sync negative, RCA jack x 2 / SCART
AUDIO IN 0 dBm more than 47 kohms, RCA jack (L, R) x 2 / SCART
DV IN 4 pin (i.LINK/IEEE 1394 standard)
• OUTPUTS
VIDEO OUT 1 Vp-p 75 Ω, sync negative, RCA jack x 1
S-VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, Mini DIN 4-pin x 1
(C) 0.3 V (p-p) 75 Ω
COMPONENT VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, RCA jack x 1
(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2
Audio output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack x 1
Audio output (optical audio) 5 V (p-p), 75 Ω, Optical connector x 1
Audio output (analog audio) 2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCA jack (L, R) x 1 / SCART
• ACCESSORY:
Video cable ..................................1 Audio cable . . . . . . . . . . . . . . .1
RF Coaxial Cable.........................1 SCART Cable . . . . . . . . . . . . .1
Blank DVD-R disc ........................2 Remote control . . . . . . . . . . . .1
Batteries.......................................2

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
1. EXPLODED VIEWS ...............................................................................................................2-2
1. Cabinet and Main Frame Section ..........................................................................................2-2
2. Deck Mechanism Section(RL-01A) .......................................................................................2-3
3. Packing Accessory Section ...................................................................................................2-4

2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
280
A50
A43
A60
A44
A52
A43A
283
284
285
288
465 A50
266
A48
468
468
A46
467
264
467
261
262
467
261
262
260
263
261
261
452
452
466
270
466
452
452
466
A00
468
468
300
320
267
268
467
265
467
467
463
463
250
465
468
104
101
102 103
457
468
468
468
A47
457
463
463
463
463
465
410
410
410
410
457
100
A26
A
5
4
3
2
1
BCD

2-3
2. DECK MECHANISM SECTION(RL-01A)
001
004
005
431 431
036
030
025
028
035
034
038
029
033
023
022
031 433
032
025
432
021
037
037
026
011
019
019
019A
024
020
A01
A02
A51
A03
042
041
A01A
002
003
012
014
016
015
017
018
435
013
A04
027

2-4
808 Battery Cable, Coaxial
Plug Ass'y, 1Way
Plug Ass'y, 2Way
Bag
Packing
Remote Control
Instruction Ass'y
Packing
Box
806
804
803
811
812
801
900
802
803
810 CABLE ASS'Y 821 SCART CABLE
OPTIONAL PART
3. Packing Accessory Section

3-1
SECTION 3
ELECTRICAL
CONTENTS
HDR PART
ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . .3-2
1. POWER ( SMPS ) CIRCUIT (PART 1) . . . . . . . . . .3-2
2. POWER ( SMPS ) CIRCUIT (PART 2) . . . . . . . . . .3-3
3. SYSTEM CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . .3-4
4. DISC NOT RECOGNIZED. . . . . . . . . . . . . . . . . . .3-4
5. WHEN PLAYING DISC ,NO AUDIO OUTPUT . . . .3-5
6. NO OPTICAL / DIGITAL OUTPUT . . . . . . . . . . . . .3-5
7. NO TUNER AUDIO OUTPUT . . . . . . . . . . . . . . . .3-6
8. NO EXTERNAL INPUT 1 AUDIO . . . . . . . . . . . . . .3-8
9. NO EXTERNAL INPUT 2 AUDIO . . . . . . . . . . . . . .3-9
10. NO EXTERNAL INPUT 3 AUDIO . . . . . . . . . . . .3-10
11. NO EXTERNAL INPUT 4 AUDIO . . . . . . . . . . . .3-10
12. NO RGB/ COMPONENT VIDEO SIGNAL
WHEN PLAYING DISC . . . . . . . . . . . . . . . . . . .3-11
13. NO COMPOSITE/S-VIDEO SIGNAL
WHEN PLAYING DISC . . . . . . . . . . . . . . . . . . .3-12
14. NO TV , EXTERNAL INPUT VIDEO SIGNAL . . .3-13
15. NO DV( IEEE 1394 ) INPUT (VIDEO/AUDIO)
SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-14
BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . .3-15
1. OVERALL BLOCK DIAGRAM . . . . . . . . . . . . . . .3-15
2. IN/OUT BLOCK DIAGRAM . . . . . . . . . . . . . . . . .3-17
3. VIDEO BLOCK DIAGRAM . . . . . . . . . . . . . . . . . .3-19
4. VIDEO SW PATH BLOCK DIAGRAM . . . . . . . . .3-21
5. AUDIO BLOCK DIAGRAM . . . . . . . . . . . . . . . . . .3-23
6. AUDIO SW PATH BLOCK DIAGRAM . . . . . . . . .3-25
7. FLD / µ-COM BLOCK DIAGRAM . . . . . . . . . . . . .3-27
8. POWER : MAIN BOARD BLOCK DIAGRAM . . . .3-29
9. POWER : I/O BOARD BLOCK DIAGRAM . . . . . .3-31
10. LAYOUT CONNECTION BLOCK DIAGRAM . . .3-33
11. SMPS BLOCK DIAGRAM (PART 1) . . . . . . . . . .3-35
12. SMPS BLOCK DIAGRAM (PART 2) . . . . . . . . . .3-37
CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . .3-39
1. POWER CIRCUIT DIAGRAM . . . . . . . . . . . . . . .3-39
2. E5 BGA, POWER, UART2 CIRCUIT DIAGRAM .3-41
3. DDR SDRAM, FLASH CIRCUIT DIAGRAM . . . . .3-43
4. RST, CONTROL/STATUS REG, ATAPI,
HOST CPLD, LATCH CIRCUIT DIAGRAM . . . . .3-45
5. 1394, ETHERNET CONNECTOR CIRCUIT
DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-47
6. VIDEO IN/OUT CIRCUIT DIAGRAM . . . . . . . . . .3-49
7. AUDIO IN/OUT CIRCUIT DIAGRAM . . . . . . . . . .3-51
8. I/O MICOM CIRCUIT DIAGRAM . . . . . . . . . . . . .3-53
9. TUNER, VIDEO IN/OUT CIRCUIT DIAGRAM . . .3-55
10. FRONT CIRCUIT DIAGRAM . . . . . . . . . . . . . . .3-57
11. ONSPEC 3 IN 1 MEMORY CARD &
DV AVIN CIRCUIT DIAGRAM . . . . . . . . . . . . . .3-59
• WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-61
• CIRCUIT VOLTAGE CHART . . . . . . . . . . . . . . . . . .3-63
PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . .3-69
1. MAIN P.C.BOARD(TOP SIDE) . . . . . . . . . . . . . .3-69
2. MAIN P.C.BOARD(BOTTOM SIDE) . . . . . . . . . . .3-71
3. I/O P.C.BOARD . . . . . . . . . . . . . . . . . . . . . . . . . .3-73
4. JACK P.C.BOARD . . . . . . . . . . . . . . . . . . . . . . . .3-73
5. FRONT P.C.BOARD . . . . . . . . . . . . . . . . . . . . . .3-75
6. KEY P.C.BOARD . . . . . . . . . . . . . . . . . . . . . . . . .3-76
7. POWER P.C.BOARD . . . . . . . . . . . . . . . . . . . . . .3-77
RL-01A LOADER PART
ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . .3-79
BLOCK DIAGRAMS & DESCRIPTION . . . . . . . . . . . .3-93
1. OVERALL BLOCK DIAGRAM . . . . . . . . . . . . . . .3-93
2. MAJOR IC INTERNAL BLOCK DIAGRAM AND
PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . .3-94
3. MAJOR IC INTERNAL BLOCK DIAGRAM AND
PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . .3-99
4. IC302(UPD76F0047):MICOM . . . . . . . . . . . . . .3-108
WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-112
1. POWER & RESET SIGNAL . . . . . . . . . . . . . . . .3-112
2. MAIN CLOCK1 FOR IC202 (16.9MHZ) . . . . . . .3-112
3. MAIN CLOCK2 FOR IC302 (20MHZ) . . . . . . . . .3-113
4. SDRAM CLOCK . . . . . . . . . . . . . . . . . . . . . . . .3-113
5. TRAY OPEN/CLOSE SIGNAL 1 . . . . . . . . . . . . .3-114
6. TRAY OPEN/CLOSE SIGNAL 2 . . . . . . . . . . . . .3-114
7. SLED MOVE SIGNAL 1 . . . . . . . . . . . . . . . . . . .3-115
8. SLED MOVE SIGNAL 2 . . . . . . . . . . . . . . . . . . .3-115
9. FOCUS SEARCH SIGNAL . . . . . . . . . . . . . . . .3-116
10. LASER TURN ON SIGNAL . . . . . . . . . . . . . . .3-116
11. DISC TYPE JUDGEMENT WAVEFORM
(CD SERIES) . . . . . . . . . . . . . . . . . . . . . . . . . .3-117
12. DISC TYPE JUDGEMENT WAVEFORM
(CD&CD-R) . . . . . . . . . . . . . . . . . . . . . . . . . . .3-117
13. DISC TYPE JUDGEMENT WAVEFORM
(CD-RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-118
14. DISC TYPE JUDGEMENT WAVEFORM
(DVD SERIES) . . . . . . . . . . . . . . . . . . . . . . . .3-118
15. DISC TYPE JUDGEMENT WAVEFORM
(DVD_SINGLE&R) . . . . . . . . . . . . . . . . . . . . . .3-119
16. DISC TYPE JUDGEMENT WAVEFORM
(DVD _DUAL) . . . . . . . . . . . . . . . . . . . . . . . . .3-119
17. DISC TYPE JUDGEMENT WAVEFORM
(DVDRW) . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-120
18. SPINDLE WAVEFORM1 . . . . . . . . . . . . . . . . .3-120
19. SPINDLE WAVEFORM2 . . . . . . . . . . . . . . . . .3-121
20. FOCUS ON SIGNAL(CD) . . . . . . . . . . . . . . . .3-121
21. FOCUS ON SIGNAL(CD) . . . . . . . . . . . . . . . .3-122
22. FOCUS ON SIGNAL(DVD) . . . . . . . . . . . . . . .3-122
23. FOCUS ON SIGNAL (DVD) . . . . . . . . . . . . . . .3-123
24. TRACK OFF SIGNAL(CD) . . . . . . . . . . . . . . . .3-123
25. TRACK OFF SIGNAL(DVD) . . . . . . . . . . . . . . .3-124
26. TILT DRIVER SIGNAL(DISC READING) . . . . .3-124
27. RF WAVEFORM(DVD) . . . . . . . . . . . . . . . . . .3-125
28. RF WAVEFORM(CD) . . . . . . . . . . . . . . . . . . . .3-125
29. WOBBLE(DVD-R/RW)_READING . . . . . . . . . .3-126
30. WOBBLE(DVD+R/RW)_READING&WRITING
=>X1 SPEED . . . . . . . . . . . . . . . . . . . . . . . . .3-126
31. LD ENABLE(DVD) . . . . . . . . . . . . . . . . . . . . . .3-127
32. LD ENABLE(CD) . . . . . . . . . . . . . . . . . . . . . . .3-127
33. LASER POWER(READING)_DVD+RW . . . . . .3-128
34. LASER POWER(ERASE)_DVD+RW . . . . . . . .3-128
35. LASER POWER(WRITING)_INITIAL STATE . .3-129
36. LASER POWER(WRITING)_PROCESSING . .3-129
CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . .3-130
1. RF CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . .3-130
2. DSP CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . .3-132
3. µ-COM CIRCUIT DIAGRAM . . . . . . . . . . . . . . .3-134
PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . .3-136
1. MAIN P.C.BOARD(TOP SIDE) . . . . . . . . . . . . . .3-136

3-2
ELECTRICAL TROUBLESHOOTING GUIDE
HDR PART
No 5VD
No 5.2VA
Is 5.2VA section working?
Is 5.2V present at
emitter of Q120?
Replace Q120
Replace TH01
Replace BD101
No VF+
Is 5.2VA section working?
Replace R102
Check R102
NO
YES YES
YES
Check F101
YES
Is there a DC voltage at
TH01?
YES
Is there a DC voltage
At (+) terminal of BD101?
Replace IC101
YES
YES
YES
YES
1. Power ( SMPS ) Circuit (Part 1)
NO
NO
NO
NO

3-3
No 3.3V
No 3.8VA
Is 3.8VA section working?
Is there a DC voltage at
IC154 1PIN
Check IC154
Replace IC154
No 1.8V
Is 3.8VA section working?
Check IC160
Replace IC160
Is there a DC voltage at
IC160 1PIN
NO
NO
YES YES
Is there a DC voltage
D122(-)?
YES
YES
Replace IC104
Check Polarity D122
Replace IC104
NO
YES
YES
YES
YES
2. Power ( SMPS ) Circuit (Part 2)
NO
NO

3-4
Replace X101
Check IC308 power and
other circuits
LG LOGO not displayed
at POWER : ON.
IC308 - 8 : HIGH?
( /E5_RST )
RESET IC202 - 26 : check
signal? (/FCS0 )
Check IC313 signal flow
X101 : Clock oscillated?
( 13.5 MHz )
NO
NO
NO
YES
YES
Check IC202 power and
other circuits
YES
Check SMPS
NO
Check DRIVE power?
5V, 12V
Check ATAPI Interface
connector J301
YES
3. SYSTEM Circuit
4. DISC not recognized.

3-5
Check IC201 power and
other circuits
Check IC702 power and
other circuits
IC702 - 46: HIGH ?
( LOW: AUDIO MUTE )
IC201 - 1 : HIGH ?
RESET_Audio status)
IC201 – 8,9 :
I2C signal normal?
Check IC201 power and
other circuits
IC201 – 14,15,18,19
Check audio output
NO
NO
NO
NO
YES
Check IC309 power and
other circuits
Check
R120,R121,R122,R123
YES
YES
YES
5. When playing DISC ,no audio output
Check R112
NO
PN6701 - 2 signal normal?
Check FFC CABLE signal
flow
YES
6. No OPTICAL / DIGITAL output

3-6
IC808,809 (AUDIO SWITCH) Power and switching operation
Pin 2,4 High/Low =>pin 7 output : SW_A_OUT_L/R
< When playing DISC , no
audio output> check
Audio output even when
Playing Disc
IC808,809-3
Check audio signal input
IC804 - 23,27
Check audio signal output
IC804 – 20,24
Check audio signal input
IC 807 - 30,31 :
No audio signal output
Q803 2(Emitter ) High?
IC702 - 46
LOW:AUDIO MUTE
Check R913, R914, C876,
C877 signal flow
Check IC807 power and other circuits,
Check X801 oscillated
IC808,809 - 7
Check audio signal output
NO
NO
NO
NONO
NO
NO
NO
YES
Check IC808,809signal
flow and power
IC804 - 32,33
Check I2C signal flow
IC804 – 9:LOW?
HIGH: AUDIO MUTE
IC804 - 32,33
Check signal flow
YES
YES
YES
YES
YES
YES
YES
YES
7. No TUNER audio output

3-7
IC807 - 2 : Check SIF
signal input
When changing a channel, IC702 -
69 : HIGH after RESET signal
IC702 - 39 :
No Sync signal input
No TUNER VIDEO signal
input
Check IC705 power and
other circuits
Check Q702 ( V.Buffer TR)
circuit
NO
NO
NO
NO
Check C866, TUNER
signal flow
Check IC702 power and
other circuits
YES
YES
YES
YES
Check TUNER power
and other circuits
YES

3-8
IC808,809 (AUDIO SWITCH) Power and switching operation
Pin 2,4 High/Low =>pin 7 output : SW_A_OUT_L/R
When playing DISC , no
audio output> check
Audio output even when
Playing Disc
IC808,809-3
Check audio signal input
IC804 - 23,27
Check audio signal output
IC804 – 10,16
Check audio signal input
END
Q803 2(Emitter ) High?
IC702 - 46
LOW:AUDIO MUTE
JK803-2,6
Check input
IC808,809 - 7
Check audio signal output
NO
NO
NO
NONO
NO
NO
YES
Check IC808,809signal
flow and power
IC804 - 32,33
Check I2C signal flow
IC804 – 9:LOW?
HIGH: AUDIO MUTE
IC804 - 32,33
Check signal flow
YES
YES
YES
YES
YES
YES
8. No external input 1 audio