LG LSS-3200A User manual

SERVICE MANUAL
MODEL : LSS-3200A
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL : LSS-3200A
SERVICE MANUAL
P/NO : 3829RVN006T
AUGUST, 2003
Printed in Korea

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

SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS ......... 1-3
SERVICING PRECAUTIONS .................................................................................. 1-4
• General Servicing Precautions
• Insulation Checking Prodedure
• Electrostatically Sensitive Devices
SPECIFICATIONS ................................................................................................... 1-5

1-3
CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY,
NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFAC-
TURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY
VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY
RESULTING PROPERTY DAMAGE OR USER INJURY.
SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE
THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY
CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE,
INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE
USER.
WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTEC-
TION FROM A.C. LINE SHOCK.
SAFETY CHECKS
AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A
CHECK SHOULD BE MADE OF THE FOLLOWING.
SUBJECT : FIRE & SHOCK HAZARD
1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY
AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS.
THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE
TRANSPORTED TO AND FROM THE REPAIR SHOP.
2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES
SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN
RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE
BEEN REINSTALLED PER 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, DAMAGED
INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECESSARY
FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.
5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR
A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND
PROTRUNING METAL SURFACES MUST BE AVOIDED.
6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF
RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT
FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS
OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIR-
CUIT MODIFICATIONS.
7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C.
LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABI-
NET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HAN-
DLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE
WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE
ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLT-
METER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN
THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESIS-
TOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR
BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CON-
DUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME.
MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500
OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG
AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED
METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75
VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY
VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK
HAZARD AND MUST BE CORRECTED IMMEDIATELY.
SUBJECT: GRAPHIC SYMBOLS
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN
AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE
SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
“DANGEROUS VOLTAGE”THAT MAY BE OF SUFFICIENT MAG-
NITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIAN-
GLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO
THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN
SERVICE LITERATURE.
SUBJECT : X-RADIATION
1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PER-
SONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTEN-
TIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PIC-
TURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN
THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE
PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERA-
TION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PIC-
TURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIR-
CUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIR-
ABLE LEVELS.
2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE
USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN
COLOR SETS, ALWAYS RE-INSTALL THEM.
3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN
ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA
TION OF THE METER SHOULD BE CHECKED PERIODICALLY
AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE
AT YOUR DISTRIBUTOR.
4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY
THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY
TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD
BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE
WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES
NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING
CORRECTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGA-
NIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGU-
LATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCE-
DURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER ON
EACH CUSTOMER’S INVOICE.
5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN
A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE,
AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND
THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT
LONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCES
SIVE VOLTAGE.
6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES
DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS
(WHERE USED).
SUBJECT: IMPLOSION
1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE
GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE
TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID
SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT.
2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.
SUBJECT : TIPS ON PROPER INSTALLATION
1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBY-
HOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO
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 RADIA-
TORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.
3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR
VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DEC-
ORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT
OBSTRUCT VENTILATION.
4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMER-
CIAL 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
TEST ON CUSTOMIZED INSTALLATIONS.
5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON
SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS
PROPERLY SECURED.
6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS
MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZ-
ARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS
THRESHOLDS OR DEEP PILE CARPETS.
7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND
WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES,
INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION
RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.’S OF
THE SAME OR LARGER SCREEN SIZE.
8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS,
EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SIN-
GLE 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
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART

1-4
SERVICING PRECAUTIONS
CAUTION : Before servicing the STB covered by this service
data and its supplements and addends, read and follow the
SAFETY PRECAUTIONS. NOTE : if unforeseen circum-
stances create conflict between the following servicing pre-
cautions and any of the safety precautions in this publica-
tions, always follow the safety precautions.
Remembers Safety First:
General Servicing Precautions
1. Always unplug the STB 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 STB 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 STB 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.)

1-5
SPECIFICATIONS
Television System Television System NTSC, Analog American Standard (480i)
ATSC, DTV standard (1080i, 720p, 480p, 480i)
DIRECTV
Channel Coverage
DTV 1-99
VHF 2-13
UHF 14-69
CATV 1-125
DIRECTV variable
Inputs/Output ATSC/NTSC RF Inputs Antenna (1), Cable TV (1)
(ATSC-8VSB over CATV or Terrestrial)
RF Output Out To TV (1) (selectable Channel 3 or 4)
DirecTV RF Input Satellite In (1)
DVI-HDTV Output DVI-HDTV Out (1), DVI-D Single Link connector
1080i, 720p, 480p digital RGB
EIA-861 Compliant, HDCP Compliant
RGB Output 15-pin Connector (1)
1080i, 720p, 480p RGB
Component Video Output Component Out (1), Phono Jack connector
1080i, 720p, 480p YPbPr
S-Video Output S-Video Out (1), 4-pin Mini-DIN
480i Y/C
Video Output Video Out (2), Phono Jack connector
480i Composite NTSC
Digital Audio Optical (selectable Dolby Digital or PCM output)
Analog Audio Audio Out (2) (Fixed Output Level)
Access Card Smart Card (Slot on the back)
Authorized Service Port 9-pin Serial Port (1)
Dimension 430mm (W) x 76.5mm (H) x 326 (D)
Mass 3.84kg
Power Requirements 120V, 60Hz
Power Consumption 100W (maximum)
25W (Standby)
Power Line 90 VAC to 137 VAC
Environment
Humidity 0 to 99 percent non condensing
Storage Temperature -20 to 60 degrees Celsius (-4 to 140 degrees Fahrenheit)
Operating Temperature 0 to 40 degrees Celsius (32 to 104 degrees Fahrenheit)
* Design and specifications are subject to change without notice.

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS .....................................................................................................................2-2
1. Cabinet and Main Frame Section ...........................................................................................2-2
2. Packing Accessory Section....................................................................................................2-3

2-2
EXPLODED VIEWS
1. Cabinet and Main Frame Section
A47
260
A46
A49
A48
A42
A43
A50
280
452
452
A44
320
469 470
300
463
463
463
463
466
250
457
465
470
469 463
463
452
A
5
4
3
2
1
BCD

2-3
2. Packing Accessory Section
808
804
803
801
900
802
803
813 S-VIDEO CABLE
825 DVI-D CABLE
824 ANTENNA, RF
806 RF CABLE
823 TELEPHONE LINE
820 PLUG ASS'Y(3WAY)
PACKING SHEET
PACKING
BATTERY
REMOCON
BOX CARTONX
OWNER'S MANUAL
PACKING
OPTIONAL PARTS

3-1
SECTION 3
ELECTRICAL
CONTENTS
SOFTWARE CORRUPTION PROBLEM.....................................................................................................3-2
ELECTRICAL TROUBLESHOOTING GUIDE............................................................................................3-5
1. POWER(SMPS) CIRCUIT ....................................................................................................................3-5
2. AUDIO CIRCUIT ....................................................................................................................................3-7
1) NO ATSC AUDIO..................................................................................................................................3-7
2) NO DIRECTV AUDIO .........................................................................................................................3-11
3) NO NTSC AUDIO ...............................................................................................................................3-12
4) NO SPDIF OUT FOR ATSC & DIRECTV ..........................................................................................3-13
5) NO SPDIF FOR NTSC .......................................................................................................................3-14
6) NO 3/ 4 RF AUDIO .............................................................................................................................3-15
3. DIRECTV FRONT- END CIRCUIT(QPSK) ......................................................................................3-16
4. DVI CIRCUIT ........................................................................................................................................3-19
5. CPU(SYSTEM CONTROL) CIRCUIT...............................................................................................3-21
6. VIDEO CIRCUIT...................................................................................................................................3-29
7. DIRECTV TP- DEMUX /MODEM CIRCUIT .....................................................................................3-37
8. DIRECTV TP- DEMUX /MODEM CIRCUIT .....................................................................................3-39
9. ATSC/ QAM FRONT- END CIRCUIT................................................................................................3-41
10. NTSC FRONT- END CIRCUIT ........................................................................................................3-43
11. FRONT PANEL CIRCUIT .................................................................................................................3-44
12. CAM BOARD CIRCUIT ....................................................................................................................3-46
OVERALL BLOCK DIAGRAM....................................................................................................................3-47
1. OVERALL BLOCK DIAGRAM 1 ............................................................................................................3-47
2. OVERALL BLOCK DIAGRAM 2 ............................................................................................................3-49
BLOCK DIAGRAM & SIGNAL FLOW.......................................................................................................3-51
1. POWER(SMPS) BLOCK DIAGRAM ......................................................................................................3-51
2. DIRECTV BLOCK DIAGRAM & SIGNAL FLOW...................................................................................3-53
3. ATSC BLOCK DIAGRAM & SIGNAL FLOW .........................................................................................3-55
4. NTSC BLOCK DIAGRAM & SIGNAL FLOW.........................................................................................3-57
CIRCUIT DIAGRAM......................................................................................................................................3-59
1. POWER(SMPS) CIRCUIT DIAGRAM ....................................................................................................3-59
2. CPU(PPC405CR) CIRCUIT DIAGRAM ..................................................................................................3-61
3. CPU PERI, RF-REMOTE, VCR-CTRL CIRCUIT DIAGRAM..................................................................3-63
4. FRONTEND CIRCUIT DIAGRAM...........................................................................................................3-65
5. HD2 & SDRAM CIRCUIT DIAGRAM .....................................................................................................3-67
6. DIRECTV HD-STB CIRCUIT DIAGRAM ................................................................................................3-69
7. VDP I/F & DISPLAY OUTPUT CIRCUIT DIAGRAM ..............................................................................3-71
8. NTSC AUDIO PROCESSOR CIRCUIT DIAGRAM ................................................................................3-73
9. DIRECTV TP DEMUX & CAS I/F CIRCUIT DIAGRAM .........................................................................3-75
10. 2400 BPS ISO MODEM CIRCUIT DIAGRAM ......................................................................................3-77
11. POWER REGULATION CIRCUIT DIAGRAM.......................................................................................3-79
12. CAM I/F CIRCUIT DIAGRAM ...............................................................................................................3-81
13. FRONT (2R, VFD, KEY-SCAN) CIRCUIT DIAGRAM ..........................................................................3-83
14. FRONT POWER KEY CIRCUIT DIAGRAM .........................................................................................3-85
PRINTED CIRCUIT DIAGRAMS ................................................................................................................3-87
1. DIGITAL MAIN P.C.BOARD(BOTTOM)..................................................................................................3-87
2. DIGITAL MAIN P.C.BOARD(TOP)..........................................................................................................3-89
3. CAM P.C.BOAR(BOTTOM) ....................................................................................................................3-91
4. CAM P.C.BOAR(TOP) ............................................................................................................................3-92
5. POWER P.C.BOARD ..............................................................................................................................3-91
6. TIMER P.C.BOARD.................................................................................................................................3-93
7. KEY P.C.BOARD ....................................................................................................................................3-95

SOFTWARE CORRUPTION PROBLEM
3-2
1. Symptom of problem
Software corruption problem occurs when IRD is unplugged while an upgrade of new soft-
ware from satellite is in progress or application program of FLASH is damaged by other
problem. In this case, IRD appear “DOWNLOAD”on VFD and is displayed on message box
of TV or monitor as below [Figure 1-1].
2. Solution of problem
To solve this problem you must rewrite application on FLASH and make following prepara-
tion.
1) Terminal emulation program transmitted in binary mode. (Ex: Tera Term)
2) 1:1 RS-232C serial cable with male to female connector.
3) Compressed application image of new version (Ex: rom.pak)
First, connect serial port of PC and RS-232 cable and execute terminal emulation program
on PC. In this, Serial port configuration is set to 115200 baud, 8 bit per character, no parity
and 1 stop bit.
And If IRD is plugged in AC, "WAIT" appear and disappear on VFD and "DOWNLOAD" dis-
play and message box on TV or monitor as [Figure 1-1] appear.
In this time, Message as [Figure 1-2] is dumped on PC termal.
Application software corrupted!!
Try power recycle and if this problem persists,
wait for a software download from the satellite,
or call your satellite receiver manufacturer
at 1-877-939-6484.
[Figure 1-1] On the TV or monitor

3-3
In PC terminal, Input “directv”and enter, and is displayed [Figure 1-3] in message box on
TV or monitor. And Message as [Figure 1-4] is dumped on PC terminal.
***** application checksum error.
[WARN!!]multiple fail –103/0 -> 104/0
> SWDL Recovery Mode
[CAS]stsid:1375731711
Periodic Task Started!!
[CAS]Major Version of IRD:448
[CAS]SCN No.: 38d1d, 3311402
In ‘GetCwpAddress’.
In ‘GetCapAddress’.
CAM_Init
CAM ID -> 0x1fde1032
In ‘SetAddress’.
Verifier version:180e
In ‘EnableCwpBuffer’. Buf# -> 3f
Successful initial verifier !!
In ‘EnableCwpBuffer’. Buf# -> 3f
> tr = 32
...
[Figure 1-2] On the terminal
Downloading a software upgrade, please wait...
DO NOT unplug your receiver.
Downloading via calibration port (115200-8-n-1)...
[Figure 1-3] On the TV or monitor
Ethernet board was not connected.
Serial download command from application.
Downloading a new software via calibration port.
Send binary data [115200,n,8,1]…
[Figure 1-4] On the terminal

3-4
In this time, Transmit a compressed application image of new version with binary file trans-
mition mode in terminal emulation and after downloading image file, write correctly and
then, wait for rebooting application program.
[Figure 1-5] as below is message on terminal that IRD transmit new file, write in FLASH and
then reboot.
xxxxxxx bytes received.
Serial binary download completed.
CRC check about downloaded image …O.K
Expand the compressed image at 0x010d0000
Erasing FLASH sector #16 - #60 (wait a minute) …
#60
FLASH memory was erased successfully.
Programing FLASH memory (wait a minute) …done
Verifying FLASH memory with source data ... done
FLASH memory was programmed successfully.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!! from now, automatic REBOOTing the System !!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[Figure 1-5] On the terminal

3-5
ELECTRICAL TROUBLESHOOTING GUIDE
1. Power(SMPS) CIRCUIT
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES YES
YES
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
(1) No 3.7VA
Check or Replace
the D129.
NO
(2) No 24VA
NO
(3) No VFD
NO 3.7VA.
Is the F101 normal?
Is the TH01
normal?
Is the BD101
normal?
Is Vcc(14~22V) sup-
plied to IC101 Pin3?
Are the D121/D122
normal?
Is there about 2.5V
at the IC103 Pin1?
Is the D124
normal?
Is the D125
normal?
Replace the F101.
(Use the same Fuse)
Replace the
BD101.
Replace the TH01.
Is the D102
normal?
Check or Replace
the D102.
Replace the
D121/D122.
Replace the D103.
Replace the
D124.
Replace the
D125.
Replace the
D129.
NO VFD
Is the F102
Normal?
Is the D128
Normal?
YES
Is the ZD151
Normal?
YES
Check or Replace
the D127.
Check or Replace
the F102.
NO Check or Replace
the D128.
NO Check or Replace
the ZD151.
Is there about 26V
at the IC151 Pin1?
Check or Replace
the IC151.
Is the D129
normal?
NO Replace the
D126.
Is the D126
normal?
NO 24VA.
YES
YES
Power in Main PCB is
short?
NO Replace the
D127.
Is the D127
normal?

3-6
YES
YES
NO
(4) No 12VA
Is there about 26V
at the IC153 pin1?
Is the IC153
Normal?
Is the ZD152
Normal?
YES
Check or Replace
the IC152.
Check or Replace
the D129.
NO Replace the IC153.
NO Replace the ZD152.

3-7
2. AUDIO CIRCUIT
1) NO ATSC AUDIO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
(1) Check IC400 and Surroundings
1.8V & 3.3V are supplied to IC400?
Data is input from TU300 to IC402 &
403(3, 6,10,13)?
Data is output from IC402 & 403
(4,7,9,12)?
Logic High is input to IC401& 402 &
403(1)?
Data is output from R424? Fig. 01
YES
3.072MHz clock is output from R422?
FIG. 02
YES
48kHz clock is output from R421?
Fig. 03
Check the Power Supply Part.
Check Tuner Part.
Check IC201(36).
Check IC402 & 403.
Check or Replace the D102.

3-8
Fig.01 Fig.02 Fig.03

3-9
Fig.04
NO
NO
NO
NO
YES
NOYES
YES
YES
(2) Check MSP4448G and Surroundings
5V is supplied to IC701
(10, 16, 49, 63)?
8V is supplied to IC701(31)?
Data pulse is input to IC701(6)?
18.432MHz Clock is input to IC701
(54, 55)?
48kHz clock is input to IC701(4)?
YES
Analog audio is output from IC701
(28, 29)? Fig. 04
Check Power Supply Part
10V is supplied to IC805(1)?
Check Power Supply Part
NO Check X701
Check IC400
Check IC702 and surroundings
NO Check IC702 and surroundings

3-10
NO
NO
YES
(3) Check IC804 and Surroundings
9V is supplied to IC702(8)?
Analog audio signal is output from
IC702(1, 7)?
Check Power Supply Part
Check IC702 and surroundings
(4) Check Output Jack and Surroundings
Check Q702, Q703, Q704, Q705,
JA600 and their surroundings

3-11
2) NO DIRECTV AUDIO
NO
NO
YES
YES
ATSC audio is OK?
IC401(1), IC402(1) and IC403(1) are
Low?
Pulse is output from R805 and R806?
Go back to symptom #1
Check IC201(36).
NO Check IC800 and surroundings.