LG LRA-516 Schematic
CONTENTS
SECTION 1 . . . . SUMMARY
SECTION 2 . . . . CABINET & MAIN CHASSIS
SECTION 3 . . . . ELECTRICAL
SECTION 4 . . . . RL-05 LOADER PART
SECTION 5 . . . . REPLACEMENT PARTS LIST
1-1
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS.............. 1-2
SERVICING PRECAUTIONS .................................................................................................. 1-3
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SERVICE INFORMATION FOR EEPROM IC SETTING.................................................. 1-4
SPECIFICATIONS ...................................................................................................................... 1-5
1-21-2
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 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.
Remembers Safety First:
General Servicing Precautions
1. Always unplug the 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 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 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 resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm.
Note 1 : Accessible Conductive Parts including 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 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 electricity sufficient to damage an ES device.)
1-5
SPECIFICATIONS
• GENERAL
Power requirements AC 120V,60 Hz
Power consumption 27W
Dimensions (approx.) 430x49x280 mm (w x h x d)
Mass (approx.) 3.4 Kg
Operating temperature 5°C to 35°C
Operating humidity 5 % to 90 %
Television system NTSC M colour system
Recording format NTSC
• RECORDING
Recording format DVD Video Recording, DVD-VIDEO
Recordable discs DVD-ReWritable, DVD-Recordable, DVD+ReWritable,
DVD+Recordable
Recordable time Approx. 1 hour (HQ mode), 2 hours (SQ mode),
4 hours (LQ mode), 6 hours (EQ mode)
Video recording format
Sampling frequency 27MHz
Compression format MPEG 2
Audio recording format
Sampling frequency 48kHz
Compression format Dolby Digital
• PLAYBACK
Frequency response DVD (PCM 48 kHz): 8 Hz to 22 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% THD (AUDIO OUT connector)
Dynamic range More than 95 dB (AUDIO OUT connector)
• INPUTS
ANTENNA IN Antenna input, 75 ohms
VIDEO IN 1.0 Vp-p 75 ohms, sync negative, RCA jack x 2
AUDIO IN 0 dBm more than 47 kohms, RCA jack (L, R) x 2
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) 3 V (p-p), Optical connector x 1
Audio output (analog audio) 2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCA jack (L, R) x 1
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
3. Packing Accessory Section ...................................................................................................2-4
2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
A
5
4
3
2
1
BCD
463
468
A46
468
463
463
463
250
272
A60
468
467
268
267
TU701
A52
465
264
OPTIONAL PART
300
468
261
260
320
273
465
261
463
261
A54
A47
452
A50
A43
275
452
283
463
274
A44
255
A48
465
261
280
2-32-3
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
2-4
3. Packing Accessory Section
810
CABLE ASS'Y
OPTIONAL PART
Cable, Coaxial
806
808 Battery
Remote Control
900
Instruction Ass'y
801
Packing
803
Box
802
811
Plug Ass'y, 1Way
Plug Ass'y, 2Way
812
822
803
FLAT CABLE
Bag
804
Packing
3-1
SECTION 3
ELECTRICAL
CONTENTS
VDR PART
ELECTRICAL TROUBLESHOOTING GUIDE...................................................................................3-2
1. POWER (SMPS) CIRCUIT ........................................................................................................3-2
2. SYSTEM CIRCUIT ......................................................................................................................3-5
BLOCK DIAGRAMS ........................................................................................................................3-11
1. SMPS BLOCK DIAGRAM .........................................................................................................3-11
2. VIDEO BLOCK DIAGRAM ........................................................................................................3-13
3. VIDEO 6DB AMP WITH 75Ω X2 DRIVE BLOCK DIAGRAM ...................................................3-15
4. VIDEO INPUT/RECORD PATH BLOCK DIAGRAM .................................................................3-17
5. VIDEO OUTPUT PATH BLOCK DIAGRAM ..............................................................................3-19
6. AUDIO INPUT PATH BLOCK DIAGRAM ..................................................................................3-21
7. FLD / U-COM / TUNER BLOCK DIAGRAM ............................................................................ 3-23
CIRCUIT DIAGRAMS ......................................................................................................................3-25
1. POWER CIRCUIT DIAGRAM ...................................................................................................3-25
2. MPEG ENCODER CIRCUIT DIAGRAM ...................................................................................3-27
3. MPEG DECODER CIRCUIT DIAGRAM ...................................................................................3-29
4. VIDEO DECODER & DV1394_PHY CIRCUIT DIAGRAM........................................................3-31
5. I/O µ-COM CIRCUIT DIAGRAM ...............................................................................................3-33
6. TUNER/MPX/ADC/DAC/JACK CIRCUIT DIAGRAM ................................................................3-35
7. FRONT JACK CIRCUIT DIAGRAM ..........................................................................................3-37
8. KEY CIRCUIT DIAGRAM ( 5 TOOL ) .......................................................................................3-39
9. KEY CIRCUIT DIAGRAM ( 6 TOOL ) .......................................................................................3-41
10. KEY CIRCUIT DIAGRAM ( 8 TOOL ) .....................................................................................3-43
11. KEY CIRCUIT DIAGRAM ( 9 TOOL )......................................................................................3-45
12. TIMER CIRCUIT DIAGRAM ( 5 TOOL ) .................................................................................3-47
13. TIMER CIRCUIT DIAGRAM ( 6 TOOL ) .................................................................................3-49
14. TIMER CIRCUIT DIAGRAM ( 8 TOOL ) .................................................................................3-51
15. TIMER CIRCUIT DIAGRAM ( 9 TOOL ) .................................................................................3-53
• WAVEFORMS.............................................................................................................................3-55
• CIRCUIT VOLTAGE CHART.......................................................................................................3-57
PRINTED CIRCUIT DIAGRAMS......................................................................................................3-63
1. MAIN P.C.BOARD(TOP SIDE) .................................................................................................3-63
2. MAIN P.C.BOARD(BOTTOM SIDE)..........................................................................................3-65
3. I/O P.C.BOARD .........................................................................................................................3-67
4. JACK P.C.BOARD.....................................................................................................................3-67
5. POWER P.C.BOARD ................................................................................................................3-68
6. KEY P.C.BOARD .......................................................................................................................3-69
7. TIMER P.C.BOARD ...................................................................................................................3-71
3-2
ELECTRICAL TROUBLESHOOTING GUIDE
VDR PART
Replace the BD101
Replace the F101
(Use the same Fuse)
No 5.3VA
Is the F101 Normal?
Is the TH01 Normal?
Is the BD101 Normal?
NO
NO
NO
NO
NO
YES
YES
Replace the TH01
Is the D102 normal?
Check or Replace the D102
Replace the IC103
NO
YES
Is there about 2.5V at
the IC103 Pin1?
Power in Main PCB
is short
Is Vcc (14V - 20V)
supplied to IC101 Pin3?
YES
YES
YES
1. Power (SMPS) Circuit
3-3
No 33VT
Is the R139 Normal?
Is there about 33V at the
Q123 pin1?
Is the ZD152 is normal?
Check or Replace the D128
YES
Check or Replace
the Q123
Replace the R139
NO
NO
NO
Replace the ZD152
YES
YES
Check or Replace the D134
No 5.0VT
Is the Vcc(5.3V) supplied
to Q124 Emittor?
Check or Replace the Q124
Is the Q122 Base ‘H’?
NO
NO
YES
Check the TIMER “H”
signal from µ-com
YES
YES
3-4
No 5.0VD
Is the Vcc(5.3V)
supplied to Q120 Emittor?
Is the Q120 Base ‘H’?
Check or Replace the Q120
NO
NO
YES
Check or Replace the D111
Check the PWR CTL “H”
signal from µ-com
NO
NO
Check or Replace
the D125
Check the PWR CTL “H”
signal from µ-com
YES
No 3.3V
Is there about 3.7V at the
IC152 pin1?
Is there about 3.3V~ 5V at
the IC152 pin4?
Check the IC152 and
Replace
YES
YES
3-5
2. SYSTEM CIRCUIT
LG logo not displayed at
POWER ON
IC301(2):HIGH?
(RST_N)
YES
IC301(231):27M? (OSC_IN)
YES
IC301(157):CVBS? (CVBS)
YES
Check IC716(30) CVBS_OUT
DRIVE not recognized
NO
NO
NO
Check IC301 power and
Other circuits
Check IC503, IC504
Check IC301 and other
Circuits
Check DRIVE power
5V, 12V
YES
Check ATAPI interface connector
CN304
NO
Check SMPS
3-6
When playing DISC, no audio output
IC301(222,224,226,234)
Audio signal normal?
YES
IC715(7, 8)
I2C signal normal?
YES
Check IC715(15-18) and
Other circuits
No OPTICAL / DIGITAL output
NO
NO
Check IC301 circuits
Concerned audio
Check IC715,IC301 I2C
signal
IC301(235)
signal normal?
YES
Check JK705(3)
Signal wave
NO
Check IC301
3-7
No Tuner Audio Output
DISC PLAY Audio Out
is normal?
YES
When AV1,AV2 Input
Audio Out is normal?
YES
IC701 22 pin
ITU_RESET_L is High?
YES
X701 18.432MHz
Clock is Okay?
NO
Check 'When playing Disc, No audio output'
Check IC717 (AUDIO SWITCH)
NO
& Check Control signal from MICOM IC501
(96, 97)
NO
Check IC506 and other circuits
NO
Check X701,C709,C710
IC506(4)
Video input is Normal?
YES
NO
Check X701,C709,C710
YES
IC701 - 2 pin
SIF signal is Okay?
YES
Check IC701 and other circuits
NO
Check TUNER and other circuits
When External Input, No Audio Output
3-8
DISC PLAY Audio Out
is normal?
YES
IC714 10, 12pin
No Audio Signal input ?
YES
IC717 - 11, 15pin
Audio swiching is okay ?
YES
When AV1 Input
REAR JACK is okay?
NO
Check 'When Playing Disc, No Audio Output'
NO
NO
NO
Check ADC Data path :IC714 -4pin
=> IC503 -5pin => IC503 -6pin => IC301 -199pin
Check IC717 (AUDIO SWITCH)
& Check Control signal from MICOM IC501
(96, 97)
Check signal path from RCA JACK to IC717
YES
When AV2 Input
PIM02,PMI02 -27,29pin
are okay?
YES
When AV2 Input
PMJ01,PJM01-2,3pin
are okay?
YES
Check JACK JK701,JK702 and other circuits
NO
NO
Check Connector PIM02 & PMI02
Check Connector PMJ01 & PJM01 and Cable
3-9
NO Composite/S-video when playing DISC
No Composite signal?
YES
Check IC716(6, 30)
YES
Check IC301(157)
YES
S_VIDEO:No Y signal?
YES
Check IC716(8)
YES
Check IC301(154)
YES
Check IC301(131):VIN_CLK
YES
Check IC301:ATAPI interface
Power,System CLK
S_VIDEO:No C signal?
YES
Check IC716(4)
YES
Check IC301(151)
YES
3-10
YES
NO
YES
NO
YES
NO
YES
NO DV(IEEE1394) input(audio/video) signal
Check DV_JACK,CABLE
connection
IC401(27-30)
Signal normal?
IC401(1)
SYSCLK normal?
IC401(4-11)
DATA normal?
Check IC401(2,3)
Control signal
Check IC401 and
Other circuits
Check IC401 and
Other circuits
Check IC401 and
Other circuits
3-11 3-12
BLOCK DIAGRAMS
1. SMPS Block Diagram
PMIO2
I2C Pull-Up
MPEG
DECODER
CS98300
IC301
SDRAM 64Mbit
SDRAM
IC302, IC303
Vcc
L303
L301
L302
L304
L305
L306
5.1V
P1V8_2
1.8V
P1V8_1
P1V8
3.3V
P3V3
P3V3_1
L505
L501
L504
L201
L202
L203
L204
VIDEO
DECODER
TVP5146
IC501
MPEG
Encoder
CS92686
IC201
SDRAM 16Mbit
SDRAM 64Mbit
SDRAM
IC202~IC205
FLASH 32Mbit
IC304
74HCU04
IC503
EEPROM
24LC04
L307
L506
L401
L402
L507
1394 PHY
TSB41AB1
IC401
74LCX125
IC503
3-13 3-14
2. VIDEO Block Diagram
RF SIGNAL
TUNER
TUNER
TUNER_VIDEO
Y_IN
V2_IN
R_V1_IN
C_IN
CVBS_OUT
C_SEPA_OUT
Y_SEPA_OUT
Pr_RCA_OUT
Y_RCA_OUT
Pb_RCA_OUT
75Ω
75Ω
MN101DF10G
MN101DF10G
I/O MICOM
I/O MICOM
I2C
V_MUTE_L
BH7868
BH7868
VIDEO
VIDEO
6dB Amp .
6dB Amp .
75 Driver
75 Driver
CLP
CVBS
Y /
C
G (Y
B (Pb)
R (Pr)
C_SYNC_IN
CS98300
)
Decoder
MD[31: 0]
MA[10:0]
SDRAM
SDRAM
64Mb x 2
64Mb x 2
74HC04
74HC04
INVERTER
INVERTER
MPEG
MD[27:16]
MA[10:0]
Flash
Flash
32Mb
32Mb
TVP5146
VIDEO
DECODER
EEPROM
EEPROM
24LC04
24LC04
I2C Contro l
27MHz
CS982_CLK
SM_SYSCLK
VIN_CLK
/DV_PASS
HM_WR
HM_RD
HM_RDY
HM_D[15:0]
HM_CS[4:0]
14.31818MHz
YIN[7: 0]
HM_CS3
HM_WR
HM_RD
HM_D[15:0]
HOST BUS
24.576MHz
TSB41AB1
TSB41AB1
1394 PHY
1394 PHY
PD[7:0]
DVCLK
PCNT[1:0]
CS92686
MPEG
Encoder
A[11:0] MCLK[1 :0]
D[63: 0]
SDRAM
SDRAM
16Mb
16Mb x 4
HM_WR
HM_RD
HM_A[2:0]
HM_D[15:0]
HM_CS[1:0]
TPA+/TPB+/-
x 4
DVD±RW DRIVER
MAIN BOARD
3-15 3-16
3. Video 6dB Amp with 75Ω x2 Drive Block Diagram
CV_OUT
3.3V
3.3V
260
261
262
0.1µF
214
215
216
0.1µF
COMP
IREF
VREF
MPEG
MPEG
DECODER
DECODER
CS98300
CS98300
IC301
IC301
COMP
IREF
VREF
Y_OUT
YG_OUT
UB_OUT
0.1µF
175Ω
0.1µF
175Ω
C_OUT
157
154
151
V_MUTE_L
208
205
Video 6dB Amp
6
75Ω75Ω
75Ω75Ω
75Ω75Ω
75Ω75Ω
75Ω75Ω
22uF
22uF
22uF
22uF
22uF
14
10
11
13
8
4
MUTE 1
5
MUTE 2
I / P
L:13.5MHz, H:6.75MHz
6dB
6dB
6.75MHz
13.5MHz
LPF
LPF
LPF
LPF
75ΩLPF6dB
75ΩLPF6dB
75Ω LPF6dB
75Ω
75Ω
30
470uF
27
470uF
32
470uF
24
470uF
21
470uF
IC716
CVBS
75Ω
Y
75Ω
C
75Ω
Y/G
75Ω
Pb/B
75Ω
VR_OUT
211
15
75Ω75Ω
22uF
6dB
LPF
LPF
6.75MHz
75Ω
18
Pr/R
75Ω
470uF
3-17 3-18
4. VIDEO INPUT/RECORD PATH Block Diagram
ANALOG VIDEO EE / REC DV1394 EE / REC
ITU-R.BT656 format : 8Bit Data & Data Clock
3-state-buffer is disabled and buffer output is High-Z state.
VIN_CLK (Data Clock:27MHz) is generated from TVP5146.
17
1
80
7
VIDEO
TU_V_IN
100KΩ
DECODER
8
TVP5146
IC501
14.31818MHz
I2C Contro l
40
43,44,45,46
47,50,51,52
V1_ IN
75Ω
V2_ IN
75Ω
Y_ IN
75Ω
C_ IN
75Ω
High
Impedance
7,75
73
MPEG
Encoder
CS92686
IC201
I2C Control
R.656 Data From A.Video IN
CS982_CL
I2C Contro
27MHz
74HCU04
74HCU04
IC503
IC503
K
74LC
l
DV_PASSn
MPEG
DECODER
CS98300
state
98
IC503
X125
183
131
10
'H'
VIN_CLK
SYSCLK
63,64,65,66
67,70,71,72
YIN[7:0]
IC301
57,58,59,60
102,103,104,106
27MHz: A.Video In
RF SIGNAL
TUNER
TUNER
CS982_CLK
I2C Contro l
ITU-R.BT656 format : 8Bit Data & Data Clock
TVP5146 Clock Output is High-Z State by IIC control.
3-state-buffer is Enabled by enable pin ìLowî state
VIN_CLK (Data Clock:27MHz) is generated from IC
24.576MH
VIDEO
1394 PHY
1394 PHY
TSB41AB1
TSB41AB1
73
Encoder
CS92686
I2C Contro
IC401
IC401
DVCLK
PCNT[1:0]
MPEG
IC201
PD[7:0]
I2C Contro l
27MHz
74HCU04
74HCU04
IC503
IC503
74LCX125
MPEG
DECODER
DECODER
TVP5146
High
Impedance
state
98
IC503
DV_PASSn
10
'L'
183
131
IC501
VIN_CLK
40
14.31818MHz
SYSCLK
63,64,65,66
67,70,71,72
7,75
CS98300
IC301
YIN[7:0]
57,58,59,60
102,103,104,106
R.656 Data From DV1394 IN
27MHz: DV1394 I
N
503.
z
TPA+/TPB+/-
l
3-19 3-20
5. VIDEO OUTPUT PATH Block Diagram
SM_SYSCLK
27MHz
74HC04
74HC04
IC504
IC504
6
231
CS982_CLK
3.3V
0.1µF
175Ω
0.1µF
175Ω
260
261
262
0.1µF
3.3V
214
215
216
0.1µF
74LCX125
98
12
DV_PASSn
COMP
IREF
VREF
COMP
IREF
VREF
MPEG
ENCODER
CS92688
IC201
IC503
10
IC301
IC301
131
183
MPEG
MPEG
DECODER
DECODER
CS98300
CS98300
57,58,59,60
102,103,104,106
CV_OUT
Y_OUT
C_
OUT
YG_OUT
UB_OUT
PCNT[1:0]
DVCLK
PD[7:0]
157
154
151
V_MUTE_L
208
205
24.576MHz
DV. PHY
DV. PHY
TSB41AB1
TSB41AB1
IC401
IC401
YIN[7-0]
ITU-R BT.656
VIN_CLK
75Ω75Ω
75Ω75Ω
75Ω75Ω
75Ω75Ω
75Ω75Ω
22uF
22uF
22uF
22uF
22uF
DV 1394 input
From JACK board
TPA+/TPB+/-
6
8
4
MUTE 1
5
MUTE 2
14
10
11
13
I / P
6dB
6dB
DECODER
Video 6dB Amp
IC716
6.75MHz
L:13.5MHz, H:6.75MHz
13.5MH
z
LPF
LPF
LPF
LPF
14.31818MHz
VIDEO
TVP5146
IC501
75ΩLPF6dB
75ΩLPF6dB
75ΩLPF6dB
75Ω
75Ω
1
7
8
17
80
30
470uF
27
470uF
32
470uF
24
470uF
21
470uF
TU_V_IN
V1_ IN
V2_ IN
Y_ IN
C_ IN
TUNER
5
1KΩ
RF SIGNAL
TUNER
MOD_VIDEO
CVBS
75Ω
Y
75Ω
C
75Ω
Y/G
75Ω
Pb/B
75Ω
VR_OUT
211
15
75Ω75Ω
22uF
6dB
LPF
LPF
6.75MHz
75Ω
18
Pr/R
75Ω
470uF
3-21 3-22
6. AUDIO INPUT PATH Block Diagram
24.576MHz
F-A-R-IN
F-A-L-IN
T-A-OUT-L
LR
R-A-L-IN
NJM2750
NJM2750
AUDIO S/W
AUDIO S/W
15 11
T-A-OUT-R
OPAMP
MC33202
IC706
1K
L IN
911
1K
R IN
VQ2 VQ3 VQ1 VINA VINB
AUDIO ADC
AUDIO ADC
CS5340
CS5340
4
IC71
IC714
R-A-R-IN
ADC_DATA
4
PCMO_LRCK
8
PCMIO_BCK
7
MCLK
2
I2C Contro
PCMIO_BCK
74LCX125
I2C Control
l
35,36
IC503
DV1394 IN: 'L'
The others: 'H
5
23
DV_PASS
1394 PHY
1394 PHY
TSB41AB1
TSB41AB1
IC401
IC401
PD[7:0]
DVCLK
PCNT[1:0]
MPEG ENCODER
CS92686
IC201
Data & LRCK : Input pin
Except DV1394 mode
34
6
4
1
185
'
I2S
OUTPUT
199 200
Tu, AV & DV
Audi o Input
LOOP B ACK
TPA+/TPB+/-
DV 1394 input
From JACK board
33
PCMIO_LRCKPCMI_DATA
DV1394 mod
TUNER,AV Input
EE/REC mode
e
AUDIO DAC
AUDIO DAC
CS4351
CS4351
5
IC71
IC715
3
PCMO_LRCK
2
PCMIO_BCK
MCLK
4
1
PCMO_DATA
SPDIF_OUT
222
224
226
234
235
CS98300
MPEG
DECODER
3-23 3-24
7. FLD / u-COM / Tuner Block Diagram
X901
10MHz
CS98300
MPEG
DECODER
FLD
FLD901
G( )P( )
MICOM
IC901
196
HOST_TXD
197
HOST_RXD
2
HOST_RESET
FLD_TXD
FLD_RXD
FLD_ENA_L
FLD_RESET
FLD_CLK
15
16
19
X501
14.318MHz
X502
32.768KHz
I/O MICOM
IC501
MN101DF10GAF
11,22
Reset_L
69
17, 18
50
4
MTS IC
MSP34X7
1
IC70
2
PWR_FAIL_L
5.3VA
213
12,13
I2C_DATA,CLK
AFT
6dB Vi deo AMP
IC510
MM1510
SIF
31
TUNER
TU701
9, 10
1184
42
IC508
KIA7042
16
TU_V
_IN
5.3VA
From
JACK BOARD
S_DET
5.3VA
10K
2.2K
S_DET_H
100K
7
PWR_CTL_H
To
POWER BOARD
VCC
2543
31
IC503
KIA7031
36,51,73
SYS_5.3VA
470UF
2.2K
10K
10K
3-25 3-26
CIRCUIT DIAGRAMS
1. POWER CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE
MODIFIED OR ALTERED WITHOUT PERMISSION
FROM THE LG ELECTRONICS CORPORATION. ALL
COMPONENTS SHOULD BE REPLACED ONLY WITH
TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIR-
CUIT. SPECIAL COMPONENTS ARE SHADED ON THE
SCHEMATIC FOR EASY IDENTIFICATION.
THIS CIRCUIT DIAGRAM 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.
NOTE :
1. Shaded( ) parts are critical for safety. Replace only
with specified part number.
2. Voltages are DC-measured with a digital voltmeter
during Play mode.
3-27 3-28
2. MPEG ENCODER CIRCUIT DIAGRAM5 BGA, POWER, UART2 CIRCUIT DIAGRAM
A B C D E F G H I J K L M N O P Q R ST
3-29 3-30
A B C D E F G H I J K L M N O P Q R ST
3. MPEG DECODER CIRCUIT DIAGRAM
3-31 3-32
A B C D E F G H I J K L M N O P Q R ST
4. VIDEO DECODER & DV1394_PHY CIRCUIT DIAGRAM
Loading...