LG KRRH-750-THTS, LHRH-7505-TA, LHRH-7506-TA, LHRH-7700-T Service manual
HDD/DVD Recorder Receiver System
SERVICE MANUAL
MODELS : KR-RH750THTS/LH-RH7505TA/
LH-RH7506TA/LH-RH7700T
KR-RH750THTS/
LHS-75TA5S/LHS-75TA5C/LHS-75TA5A
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODELS : KR-RH750THTS/LH-RH7505TA/LH-RH7506TA/LH-RH7700TSERVICE MANUAL
P/NO : 3829RGP020T OCTOBER, 2005
1-1
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ............. 1-2
SERVICING PRECAUTIONS .................................................................................................. 1-3
THE STEPS FOR CHANGE THE OPTION CODE ........................................................... 1-4
SPECIFICATIONS ...................................................................................................................... 1-5
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 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 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 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 DVD Recorder Combi
Receiver 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 DVD Recorder Combi Receiver 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 DVD Recorder
Combi Receiver 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 DVD Recorder Combi
Receiver 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
THE STEPS FOR CHANGE THE OPTION CODE
Push Switch POWER ON/ OFF
at remocon or timer keyborad
Select DVD MODE at the set
use remocon or timer keyborad
Push REC+ PLAY
at timer keyboard
Use remocon and push ENTER
Use Direction Key at
remocon (LEFT/ RIGHT)
for select the position of option
Use Direction Key
at remocon (UP/ DOWN)
for change the option
After finish edit code of option
push ENTER at remocon
For finishing and intialized
the option code push
REC+ EJECT at remocon
NAME HEX BINARY
OPT1 00 00000000
OPT2 00 00000000
OPT3 00 00000000
OPT4 00 00000000
OPT5 00 00000000
OPT6 00 00000000
OPT7 00 00000000
OPT8 00 00000000
OPT9 00 00000000
OPT10 00 00000000
Press “Enter” key to Save and Exit
DETECT NEW EEPROM (OPTION EDIT SCREEN)
1-5
SPECIFICATIONS
GENERAL
Power requirements AC 200-240V, 50/60 Hz
Power consumption 45W
Dimensions (approx.) 430 X 49 X 350 mm (w x h x d) without foot
Mass (approx.) 4.6 kg
Operating temperature 5°C to 35°C
Operating humidity 5 % to 90 %
Recording format PAL
RECORDING
Recording format DVD Video Recording, DVD-VIDEO
Recordable media HDD (160GB), DVD-ReWritable, DVD-Recordable, DVD+ReWritable,
DVD+Recordable, DVD+Recordable (Double Layer)
Recordable time DVD (4.7GB): Approx. 1 hour (HQ mode), 2 hours (SQ mode),
4 hours (LQ mode), 6 hours (EQ mode)
DVD+R DL (8.5GB): Approx. 3 hour (HQ mode),
3 hours 40 minutes (SQ mode), 7 hours 10 minutes (LQ mode),
10 hours 30 minutes (EQ mode)
HDD (160GB): Approx. 42 hours (HQ mode), 82 hours (SQ mode),
152 hours (LQ mode), 226 hours (EQ mode)
VIDEO RECORDING FORMAT
Sampling frequency 27MHz
Compression format MPEG 2 (VBR support)
AUDIO RECORDING FORMAT
Sampling frequency 48kHz
Compression format Dolby Digital
PLAYBACK
Frequency response DVD (PCM 48 kHz): 8 Hz to 20 kHz, CD: 8 Hz to 20 kHz
DVD (PCM 96 kHz): 8 Hz to 44 kHz
Signal-to-noise ratio More than 100 dB (AUDIO OUT connector)
Harmonic distortion Less than 0.008% (AUDIO OUT connector)
Dynamic range More than 95 dB (AUDIO OUT connector)
INPUTS
AERIAL IN Aerial input, 75 ohms
VIDEO IN 1.0 Vp-p 75 ohms, sync negative, RCA jack x 2 / SCART x 2
AUDIO IN 0 dBm more than 47 kohms, RCAjack (L, R) x 2 / SCART x 2
DV IN 4 pin (IEEE 1394 standard)
OUTPUTS
VIDEO OUT 1 Vp-p 75 Ω, sync negative, RCA jack x 1 / SCART x 2
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
HDMI video/audio output 19 pin (HDMI standard, Type A)
Audio output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack x 1
Audio output (optical audio) 3 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 x 2
AMPLIFIER(LH-RH7000 SERIES)
Stereo mode 100W + 100W (6Ω at 1 kHz, THD 10 %)
Surround mode Front: 100W + 100W (THD 10 %)
Center*: 100W
Surround*: 100W + 100W (6Ω at 1 kHz, THD 10 %)
Subwoofer*: 200W (3Ω at 30 Hz, THD 10 %)
AMPLIFIER(LH-RH9000 SERIES)
Stereo mode 180W + 180W (4Ω at 1 kHz, THD 10 %)
Surround mode Front: 180W + 180W (THD 10 %)
Center*: 180W
Surround*: 180W + 180W (4Ω at 1 kHz, THD 10 %)
Subwoofer*: 300W (3Ω at 30 Hz, THD 10 %)
(* Depending on the sound mode
settings and the source, there
may be no sound output.)
(* Depending on the sound mode
settings and the source, there
may be no sound output.)
1-6
TUNER SPECIFICATIONS
Tuning Range (FM) 87.5 - 108 MHz
Intermediate Frequency (FM) 10.7 MHz
Signal-to-noise ratio 60 dB (Mono)
Tuning Range (AM) 522 - 1,620 kHz
Intermediate Frequency (AM) 450 kHz
Antenna Wire antenna (FM)
Loop antenna (AM)
SPEAKERS(LHS-75PA5)
FRONT SATELLITE CENTER ACTIVE SUBWOOFER
(LHS-75PA5F) (LHS-75PA5S) (LHS-75PA5C) (LHS-75PA5A)
Power consumption: - - - 70W
Type: 1 Way 2 Speaker 1 Way 1 Speaker 1 Way 2 Speaker 1 Way 1 Speaker
Impedance: 6 Ω 3 Ω 6 Ω 3 Ω
Frequency Response: 100 - 20,000 Hz 100 - 20,000 Hz 80 - 20,000 Hz 35 - 1,500 Hz
Sound Pressure Level: 85 dB/W (1m) 85 dB/W (1m) 85 dB/W (1m) 83 dB/W (1m)
Max Input Power: 100W 100W 100W 200W
Net Dimensions (WxHxD): 269.5x1200x269.5mm 120x223x151mm 448x85x105mm 295x432x414mm
Net Weight: 2.9 kg 1.1 kg 1.2 kg 14 kg
SPEAKERS(LHS-75SA5)
SATELLITE CENTER ACTIVE SUBWOOFER
(LHS-75SA5S) (LHS-75SA5C) (LHS-75SA5A)
Power consumption: - - 70W
Type: 1 Way 1 Speaker 1 Way 1 Speaker 1 Way 1 Speaker
Impedance: 6 Ω 6 Ω 3 Ω
Frequency Response: 100 - 20,000 Hz 0 - 20,000 Hz 35 - 1,500 Hz
Sound Pressure Level: 85 dB/W (1m) 85 dB/W (1m) 83 dB/W (1m)
Max Input Power: 100W 100W 200W
Net Dimensions (WxHxD): 120 x 223 x 151 mm 301 x 85 x 105 mm 295 x 432 x 414 mm
Net Weight: 1.1 kg 1.2 kg 14 kg
SPEAKERS(LHS-75TA5)
SATELLITE CENTER ACTIVE SUBWOOFER
(LHS-75TA5S/KR-RH750THTS) (LHS-75TA5C/KR-RH750THTS) (LHS-75TA5A/KR-RH750THTS)
Power consumption: - - 70W
Type: 1 Way 2 Speaker 1 Way 2 Speaker 1 Way 1 Speaker
Impedance: 6 Ω 6 Ω 3 Ω
Frequency Response: 80 - 20,000 Hz 80 - 20,000 Hz 35 - 1,500 Hz
Sound Pressure Level: 85 dB/W (1m) 85 dB/W (1m) 83 dB/W (1m)
Max. Input Power: 100W 100W 200W
Net Dimensions (WxHxD): 269.5 x 1200 x 269.5 mm 448 x 85 x 105 mm 295 x 432 x 414 mm
Net Weight: 2.9 kg 1.2 kg 14 kg
SPEAKERS(LHS-95TA9)
SATELLITE CENTER ACTIVE SUBWOOFER
(LHS-95TA9S) (LHS-95TA9C) (LHS-95TA9A)
Power consumption: - - 110W
Type: 1 Way 2 Speaker 1 Way 2 Speaker 1 Way 1 Speaker
Impedance: 4 Ω 4 Ω 3 Ω
Frequency Response: 80 - 20,000 Hz 80 - 20,000 Hz 35 - 1,500 Hz
Sound Pressure Level: 85 dB/W (1m) 85 dB/W (1m) 83 dB/W (1m)
Max. Input Power: 180W 180W 300W
Net Dimensions (WxHxD): 269.5 x 1200 x 269.5 mm 448 x 85 x 105 mm 295 x 432 x 414 mm
Net Weight: 2.9 kg 1.2 kg 14 kg
2-1
SECTION 2
EXPLODED VIEWS
CONTENTS
EXPLODED VIEWS.....................................................................................................................2-2
1. Cabinet and Main Frame Section...........................................................................................2-2
2. Deck Mechanism (RL-05)........................................................................................................2-3
3. SPEAKER Section ...................................................................................................................2-4
1) Woofer Speaker Section.....................................................................................................2-4
2) Center Speaker Section (OPTIONAL PART).....................................................................2-5
3) Rear Section (OPTIONAL PART)........................................................................................2-6
4) Front Speaker Section (OPTIONAL PART) .......................................................................2-7
5) Center Speaker Section (OPTIONAL PART).....................................................................2-8
2-2
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION
A
5
4
3
2
1
BCD
252
250
467
457
103
102
101
A26
410
104
300
100
A53
410
463
463
A47
253
261
A44
463
251
467
463
270
A52
320
261
A48
463
262
A50
465
463
281
467
467
261
264
463
279
463
463
A60
465
276
465
A46
272
OPTIONAL PART
276
277
275
465
A54
280
A43
283
2-3
2. DECK MECHANISM SECTION (RL-05)
1434
1026
1435
1015
1005
1016
1001
1003
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
2-4
3. SPEAKER SECTION
1) WOOFER SPEAKER SECTION
(LHS-75PA5A/LHS-75TA5A/LHS-75SA5A/LHS-95PA5A/LHS-95TA5A/LHS-95SA5A)
950
A900
952
961
953
954
955
958
A46A
A47A
263A
A52A
959
474
264A
310
956
951
957
2-5
3. SPEAKER SECTION
2) CENTER SPEAKER SECTION (OPTIONAL PART)
(LHS-75PA5C/LHS-75TA5C/LHS-95PA5C/LHS-95TA5C)
A700
754
752
758
757
750
751
755
756
755
755
751
754
2-6
3. SPEAKER SECTION
3) REAR SECTION (OPTIONAL PART)
(LHS-75PA5S/LHS-75SA5S/LHS-95PA5S/LHS-95SA5S)
A600
655
650
651
652
653
654
656
657
658
659
2-7
3. SPEAKER SECTION
4) FRONT SPEAKER SECTION (OPTIONAL PART)
(LHS-75PA5F/LHS-75TA5S/LHS-95PA5F/LHS-95TA5S)
A800
850
851
852
858
857
853
859
855
856
854
850
882
883
881
886
885
884
893
A800A
887
888
889
890
891
892
894
2-8
3. SPEAKER SECTION
5) CENTER SPEAKER SECTION (OPTIONAL PART)
(LHS-75SA5C/LHS-95SA5C)
A700
750
751
754
752
757
758
755
756
754
3-1
SECTION 3
ELECTRICAL
CONTENTS
OVERALL WIRING DIAGRAM ..............................3-2
HDR PART
ELECTRICAL TROUBLESHOOTING
GUIDE
.............................................................................3-2
1. SMPS I/O PART ......................................................3-2
2. SMPS DVD/HDD PART ...........................................3-5
3. SYSTEM CIRCUIT PART........................................3-8
4. DISC NOT RECOGNIZED.......................................3-8
5. WHEN PLAYING DISC, NO AUDIO OUTPUT........3-9
6. NO OPTICAL/DIGITALOUTPUT ..........................3-10
7. NO TUNER AUDIO OUTPUT................................3-11
8. NO EXTERNAL INPUTAUDIO .............................3-12
9. NO RGB/COMPONENT VIDEO SIGNAL
WHEN PLAY DISC ................................................3-13
10. NO COMPOSITE/S-VIDEO SIGNAL WHEN PLAY
DISC ....................................................................3-13
11. NO TV, EXTERNAL INPUT VIDEO SIGNAL ......3-14
12. NO DV(IEEE 1394)INPUT(VIDEO/AUDIO)
SIGNAL................................................................3-15
BLOCK DIAGRAMS................................................3-16
1. OVERALL H/W BLOCK DIAGRAM...................... 3-16
2. LAYOUT CONNECTION BLOCK DIAGRAM ........3-18
3. SMPS BLOCK DIAGRAM .....................................3-20
4. IN/OUT BLOCK DIAGRAM....................................3-22
5. VIDEO BLOCK DIAGRAM ....................................3-24
6. AUDIO BLOCK DIAGRAM ....................................3-26
CIRCUIT DIAGRAMS..............................................3-28
1. POWER(SMPS) CIRCUIT DIAGRAM...................3-28
2. I/O MICOM CIRCUIT DIAGRAM...........................3-30
3. I/O CIRCUIT DIAGRAM.........................................3-32
4. LSI CIRCUIT DIAGRAM........................................3-34
5. FLASH/DDR CIRCUIT DIAGRAM.........................3-36
6. RESET/RATCH CIRCUIT DIAGRAM ....................3-38
7. HDMI/IEE1394 CIRCUIT DIAGRAM .....................3-40
8. VIDEO DECODER CIRCUIT DIAGRAM...............3-42
9. INTERFACE CIRCUIT DIAGRAM .........................3-44
10. FRONT CIRCUIT DIAGRAM...............................3-46
11. FRONT PWR KEYCIRCUIT DIAGRAM...............3-48
12. FRONT JACK CIRCUIT DIAGRAM.....................3-50
• CIRCUIT VOLTAGE CHART...................................3-52
PRINTED CIRCUIT DIAGRAMS .........................3-54
1. MAIN P.C.BOARD (TOP VIEW) ........................... 3-54
2. MAIN P.C.BOARD (BOTTOM VIEW)....................3-56
3. POWER P.C.BOARD.............................................3-58
4. JACK P.C.BOARD.................................................3-58
5. I/O P.C.BOARD (TOP VIEW) .................................3-60
6. I/O P.C.BOARD (BOTTOM VIEW).........................3-62
7. KEY P.C.BOARD ...................................................3-64
8. TIMER P.C.BOARD ...............................................3-64
WOOFER PART
ELECTRICAL TROUBLESHOOTING
GUIDE
...........................................................................3-66
BLOCK DIAGRAMS ..............................................3-67
1. WIRING DIAGRAM
2. BLOCK DIAGRAM .................................................3-69
CIRCUIT DIAGRAMS............................................3-71
1. SMPS CIRCUIT DIAGRAM_700W........................3-71
2. SMPS CIRCUIT DIAGRAM_1200W......................3-73
3. AMP CIRCUIT DIAGRAM......................................3-75
4. MICOM & DSP CIRCUIT DIAGRAM.....................3-77
5. DSP CIRCUIT DIAGRAM......................................3-79
6. I/O JACK CIRCUIT DIAGRAM..............................3-81
PRINTED CIRCUIT DIAGRAMS .........................3-83
1. MAIN & WOOFER P.C.BOARD (TOP VIEW) ........3-83
2. MAIN & WOOFER P.C.BOARD
(BOTTOM VIEW) ...................................................3-85
3. POWER P.C.BOARD.............................................3-87
4. I/O JACK P.C.BOARD...........................................3-89
3-2
ELECTRICAL TROUBLESHOOTING GUIDE
HDR PART
Replace the BD101
Replace the F101
(Use the same Fuse)
No 5.3VA
Is the F101 Normal?
Is the R101 Normal?
Is the Vcc (10V - 17V)
supplied to IC101 Pin2?
Is the BD101 Normal?
Is the D121 normal?
Is there about 2.5V at the
IC103 Pin1?
Is the D126 normal?
Is the D130 Normal?
Is the D127 Normal?
Is the D128 Normal?
Power Line of I/O PCB
is short
NO
NO
NO
YES
YES
YES
YES
YESYES
YES
YES
YES
YES
YES
YES
Replace the R101
NO
NO
NO
Is the D102 normal?
Check or Replace the
D102
Replace the D121
Replace the IC103
NO
Replace the D126
NO
Replace the D130
NO
Replace the D127
NO
Replace the D128
1. SMPS I/O PART
3-3
No 12V
Is there about 3.8V
at the IC153 pin1?
Check or Replace
the D126
Is there about 3.3V~
5V at the IC153 pin4?
Check the ‘PWR CTL
“H”’ signal from µ-com
Check the IC153
and Replace
YES
YES
YES
No 5VT
Check or Replace
the D126
Is the Vcc(14V) supplied to Q124 Emittor?
Check or Replace
the D124
Is the Vcc(33V) supplied to Q124 Base?
NO
NO
Check the ‘TIMER “H”’
signal from µ-com
NO
Check the 33V Line
YES
YES
YES
No 5VD
Check or Replace
the D126
Check the ‘Power CTL
“H”’ signal from µ-com
Is the Vcc(14V) supplied to Q120 Emittor?
Is the Q120 Base
‘H’?
Check or Replace
the Q124
NO
NO
YES
YES
YES
No 12VA /12VT
Check or Replace
the D126
Is there about 14V
at the IC156 pin1?
Is there about 3.3V~
5V at the IC156 pin4?
NO NO
Check the ‘TIMER “H”’
signal from µ-com
NO NO
YES
YES
Check the IC156
and Replace
YES
3-4
NO VFD
Check or Replace
the R107
Is the R107
Normal?
Is the D128
Normal?
NO
NO
Check or Replace
the D128
NO
Check or Replace
the ZD151
YES
YES
YES
Is the ZD151
Normal?
Check or Replace
the D127
YES
No 33V
Check or Replace
the D130
Check the ‘PWR CTL
“H”’ signal from µ-com
Is the Vcc(33V) supplied to Q123 Emittor?
Is the Q123 Base
‘H’?
Check or Replace
the Q123
NO
NO
YES
YES
YES
3-5
Replace the BD101
Replace the F101
(Use the same Fuse)
No 3.8VA
Is the F101 Normal?
Is the TH01 Normal?
Is Vcc (11V -18V) supplied
to IC101 Pin3?
Is the BD101 Normal?
Are the D122 normal?
Is there about 2.5V at the
IC106 Pin1?
Is the D123 normal?
Is the D124 Normal?
Is the D125 Normal?
Power Line of Main
PCB(VDR) is short
NO
NO
NO
YES
YES
YES
YES
YESYES
YES
YES
YES
YES
YES
Replace the TH01
NO
NO
NO
Is the Q111 normal?
Check or Replace the Q111
Replace the D122
Replace the IC106
NO
Replace the D123
NO
Replace the D124
NO
Replace the D125
2. SMPS DVD/HDD PART
3-6
No 5.0V
Is there about 5.5V
at the IC151 pin1?
Check or Replace
the D124
Is there about 3.3V~ 5V
at the IC151 pin4?
Check the ‘PWR CTL
“H”’signal from µ-com
Check the IC151
and Replace
YES
YES
YES
No 3.3V
Check or Replace
the D122
Check the ‘PWR CTL
“H”’signal from µ-com
Is there about 3.8V at
the IC154 pin1?
Is there about 3.3V~
5V at the IC154 pin4?
Check the IC154
and Replace
NO
NO
YES
YES
YES
No 3.3V
Check or Replace
the D122
Check the ‘PWR CTL
“H”’signal from µ-com
Is there about 3.8V at
the IC154 pin1?
Is there about 3.3V~
5V at the IC154 pin4?
Check the IC154
and Replace
NO
NO
YES
YES
YES
No 2.5V
Check or Replace
the D122
Is there about 3.8V
at the IC152 pin1?
Is there about 3.3V~ 5V
at the IC152 pin4?
NO NO
Check the ‘PWR CTL
“H”’signal from µ-com
NO NO
YES
YES
Check the IC152
and Replace
YES
3-7
No 12V
Check or Replace
the D125
Check the ‘PWR CTL
“H”’signal from µ-com
Is there about 13.5V
at the IC157 pin1?
Is there about 3.3V~ 5V
at the IC157 pin2?
Check the IC157
and Replace
NO
NO
YES
YES
YES
No 1.8V
Check or Replace
the D123
Check the ‘PWR CTL
“H”’signal from µ-com
Is there about 2.3V at
the IC160 pin1?
Is there about 3.3V~ 5V
at the IC160 pin4?
Are the R167,R168
normal?
NO
NO
Check or Replace
the R151,R153
NO
YES
YES
YES
Check the IC160
and Replace
YES
3-8
“Please wait” displayed
Continue at Power On
Check PIM02-22
IC501-19
IC307-5: ?
(/HOST-RESET)
X101: Clock oscillated?
(27MHz)
NO
Replace X101
NO
Check IC206 & (Flash
MENORY) IC101
NO
IC101 DEFECT
NO
YES
YES
R146 : ?
IC206-26 : ?
YES
R180, R181 : ?
YES
3. SYSTEM Circuit PART
Check DRIVER Power?
5V. 12V
Change MEDIA TEST
Check J601
Check SMPS
NO
NO
YES
4. DISC not recognized
3-9
CHECK
IC709- pin2, 4 (VCC) :
pin32,33(SLC/CLK) :
IC715-pin14,19(z_mute_R/L):
IC701-pin58(A_mute_L) :
CHECK
IC715-pin1,2,3,4 :
Pin10(reset) :
Pin7,8(I
2
C) :
5. When playing DISC, no Audio output
CHECK IC714-pin3, 6,
13(VCC)
Replace IC714
YES
YES
IC715-pin15,18
(Audio_out R/L) : Is
there a signal?
CHECK Q705,
Q711, Q712
C841, C842, C7H1, C759 on
I/O PCB Is there a signal?
IC709-pin21, 22, 25,
26:Is there a signal?
YES
NO
IC101
DEFECT
NO
NO
YES
NO
YES
L728,L727: Is there
a signal?
YES
CHECK Cable connections & TV Audio mute.
YES
3-10
R101:
CHECK PIM02-pin2
(SPDIF_OUT) :
IC101 DEFECT
YES
YES
6. No OPTICAL/DIGITAL Output
3-11
7. No TUNER Audio Output
TU701-pin13(SIF):
Is there a signal?
IC701-30,31:
Is there a signal?
IC709-pin20,24,23,27 :
Is there a signal?
Check C707
Is there a signal?
Replace IC709
CHECK
IC709-pin2,4(VCC) :
pin32,33(SLC/CLK) :
YES
YES
IC703pin7, IC704-pin7:
Is there a signal?
YES
IC714-pin10,12:
Is there a signal?
YES
IC714-pin2,4,7,8 :
Pin9(reset) :
When playing DISC, no
Audio output
YES
YES YES
NO
NO
Check R704,R705:
?
NO
CHECK
IC706 : Power & In/Out PIN
NO
CHECK
IC714-pin3,6,13(VCC)
NO
Replace IC714
YES
3-12
8. No External input Audio
Check R704,R705:
?
CHECK Cable connections & Input signal.
CHECK IC706 :
Power & In/Out PIN
CHECK IC714pin3, 6, 13(VCC)
Replace IC714
NO
YES
YES
IC703-pin7, IC704pin7:Is there a signal?
IC709-pin8,10,14,16
: Is there a signal?
IC703,IC704-pin3:
Is there a signal?
IC703,IC704-pin5:
Is there a signal?
IC703,IC704-pin1:
Is there a signal?
< AV1/AV2 > < AV3 > < AV4 >
CHECK Cable connections & Input signal.
NO NO
IC714-pin10,12:
Is there a signal?
IC714-pin2,4,7,8 :
Pin9(reset) :
When playing DISC,
no Audio output
NO NO
NO
NO
YES
NO YES
YES
YES
3-13
9. No RGB/Component Video signal when play DISC
R131,R132,R133:
Is there a signal?
DIM02-7,8,9:
Is there a signal?
IC716-pin24,21,18
Is there a signal?
CHECK SW701 statue &
SW801-in2(RGB_SEL”H”)
NO
CHECK IC716pin1,16(+5.2V)
Replace IC716
YES
YES
YES
YES
10. No composite/s-video Signal when play DISC
R128,R129,R130:
Is there a signal?
PIM02-2,4,6:
Is there a signal?
IC716-27,30,32:
Is there a signal?
IC709-29.30:
Is there a signal?
NO
CHECK IC716pin1,16(+5.2V)
NO
Replace IC716
YES
CHECK IC709pin2,4(+12VA)
YES
YES
YES
Replace IC709
YES
3-14
11. No TV, External input Video signal
CHECK Signal path
on the I/O board
C540 : Is there a
signal?
Check PIM02-pin22
IC501: reset circuit
Replace IC501
YES
YES
C532,C535,C537:
Is there a signal?
C538:Is there a
signal?
No video signal of external
input AV3 (Rear RCA input)
No video signal of external
input A V4 (composite,s-video)
When Cable connecting Tuner and Rear
SCART1,2 No TV video signal(AV1/2)
NO NO NO
NO
NO
YES
YES
NO
YES
YES
YES
NO
CHECK Cable connections & Input signal.
IC501- pin34
(reset “H”) :
IC501- pin40 (VI_CLK) : X501
clock oscillated? (14.318MHz)
YES
CHECK No RGB/ component/composite Signal when play DISC
YES
3-15
12. No DV(IEEE 1394)input(Video/Audio) signal
check DV_Jack and CABLE(CN501)
connection
DV-mode
switching ?
IC401 power 3.3V
IC401-37: “High”
&X401 oscillated?(24.576MHz)
NO
CHECK SMPS
+3.3V
NO
Change to DV-mode.
Using Remote Control
NO
CHECK Reset
Circuit
YES
YES
YES
IC401-15
Is there a signal?
YES
IC401-pin1, 27, 28, 29,
30: Is there a signal?
YES
IC401-pin 2, 3 :
Is there a signal?
YES
IC101 DEFECT
YES
Check DV Cable
YES
Replace IC401
YES
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