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SERVICE MANUAL
High Definition DIGITALVIDEO RECORDER
MODEL : LST-5402P
SERVICE MANUAL
MODEL : LST-5402P
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
FEBRUARY, 2006
P/NO : 3829RVP050S Printed in Korea
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS............1-2
SERVICING PRECAUTIONS....................................................................................1-3
INSTRUCTION FOR "SYSTEM SW UPGRADE" ....................................................1-4
SPECIFICATIONS .....................................................................................................1-8
1-1
PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS
IMPORTANT SAFETY NOTICE A.C. Voltmeter
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.
0.15uF
Special components are also used to prevent x-radiation, shock and fire haz- Place this probe
Good Earth Ground
ard. These components are indicated by the letter "x" included in their compo- such as the Water
on each exposed
nent designators and are required to maintain safe performance. No deviations 1500 OHM metal part.
Pipe, Conduit, etc.
are allowed without prior approval by LG Electronics Corporation.
Circuit diagrams may occasionally differ from the actual circuit used. This way, 10 WATT
implementation of the latest safety and performance improvement changes
TIPS ON PROPER INSTALLATION
into the set is not delayed until the new service literature is printed.
1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting
CAUTION: Do not attempt to modify this product in any way. Never perform
shelf space over, or close to, a heat duct, or in the path of heated air flow.
customized installations without manufacturer's approval. Unauthorized modi-
fications will not only void the warranty, but may lead to property damage or 2. Avoid conditions of high humidity such as: outdoor patio installations where
user injury. dew is a factor, near steam radiators where steam leakage is a factor, etc.
Service work should be performed only after you are thoroughly familiar with 3. Avoid placement where draperies may obstruct venting. The customer
these safety checks and servicing guidelines. should also avoid the use of decorative scarves or other coverings that
might obstruct ventilation.
GRAPHIC SYMBOLS
4. Wall- and shelf-mounted installations using a commercial mounting kit must
The exclamation point within an equilateral triangle is intended to
follow the factory-approved mounting instructions. A product mounted to a
alert the service personnel to important safety information in the
shelf or platform must retain its original feet (or the equivalent thickness in
service literature.
spacers) to provide adequate air flow across the bottom. Bolts or screws
The lightning flash with arrowhead symbol within an equilateral tri- used for fasteners must not touch any parts or wiring. Perform leakage tests
angle is intended to alert the service personnel to the presence of on customized installations.
noninsulated "dangerous voltage" that may be of sufficient magni-
5. Caution customers against mounting a product on a sloping shelf or in a tilt-
tude to constitute a risk of electric shock.
ed position, unless the receiver is properly secured.
The pictorial representation of a fuse and its rating within an equi-
6. A product on a roll-about cart should be stable in its mounting to the cart.
lateral triangle is intended to convey to the service personnel the
Caution the customer on the hazards of trying to roll a cart with small cast-
following fuse replacement caution notice:
ers across thresholds or deep pile carpets.
CAUTION: FOR CONTINUED PROTECTION AGAINST RISK
7. Caution customers against using extension cords. Explain that a forest of
OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
extensions, sprouting from a single outlet, can lead to disastrous conse-
RATING AS MARKED NEAR EACH FUSE.
quences to home and family.
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.
1-2
SERVICING PRECAUTIONS
CAUTION: Before servicing the High Definition DIGITAL Electrostatically Sensitive (ES) Devices
VIDEO RECORDER covered by this service data and its Some semiconductor (solid state) devices can be damaged
supplements and addends, read and follow the SAFETY easily by static electricity. Such components commonly are
PRECAUTIONS. NOTE: if unforeseen circumstances create called Electrostatically Sensitive (ES) Devices. Examples of
conflict between the following servicing precautions and any typical ES devices are integrated circuits and some field
of the safety precautions in this publications, always follow effect transistors and semiconductor chip components.
the safety precautions. The following techniques should be used to help reduce the
Remember Safety First: incidence of component damage caused by static electricity.
General Servicing Precautions 1. Immediately before handling any semiconductor compo-
1. Always unplug the High Definition DIGITAL VIDEO nent or semiconductor-equipped assembly, drain off any
RECORDER AC power cord from the AC power source electrostatic charge on your body by touching a known
before: earth ground. Alternatively, obtain and wear a commer-
(1) Removing or reinstalling any component, circuit board, cially available discharging wrist strap device, which
module, or any other assembly. should be removed for potential shock reasons prior to
(2) Disconnecting or reconnecting any internal electrical applying power to the unit under test.
plug or other electrical connection.
(3) Connecting a test substitute in parallel with an elec- 2. After removing an electrical assembly equipped with ES
trolytic capacitor. devices, place the assembly on a conductive surface such
Caution: A wrong part substitution or incorrect as aluminum foil, to prevent electrostatic charge buildup or
polarity installation of electrolytic capacitors may result exposure of the assembly.
in an explosion hazard.
3. Use only a grounded-tip soldering iron to solder or unsolder
2. Do not spray chemicals on or near this High Definition ES devices.
DIGITAL VIDEO RECORDER or any of its assemblies.
4. Use only an anti-static solder removal device. Some
3. Unless specified otherwise in this service data, clean solder removal devices not classified as "anti-static" can
electrical contacts by applying an appropriate contact generate electrical charges sufficient to damage ES
cleaning solution to the contacts with a pipe cleaner, devices.
cotton-tipped swab, or comparable soft applicator.
Unless specified otherwise in this service data, lubrication 5. Do not use freon-propelled chemicals. These can
of contacts is not required. generate an electrical charge sufficient to damage ES
devices.
4. Do not defeat any plug/socket B+ voltage interlocks with
which instruments covered by this service manual might 6. Do not remove a replacement ES device from its protec-
be equipped. tive package until immediately before you are ready to
install it. (Most replacement ES devices are packaged with
5. Do not apply AC power to this High Definition DIGITAL leads electrically shorted together by conductive foam,
VIDEO RECORDER and / or any of its electrical assem- aluminum foil,or comparable conductive material).
blies unless all solid-state device heat sinks are correctly
installed.
7. Immediately before removing the protective material from
6. Always connect the test instrument ground lead to an the leads of a replacement ES device, touch the protective
appropriate ground before connecting the test instrument material to the chassis or circuit assembly into which the
positive lead. Always remove the test instrument ground device will be installed.
lead last.
Caution: Be sure no power is applied to the chassis or
Insulation Checking Procedure circuit, and observe all other safety precautions.
Disconnect the attachment plug from the AC outlet and turn
the power on. Connect an insulation resistance meter (500V) 8. Minimize bodily motions when handling unpackaged
to the blades of the attachment plug. The insulation resis- replacement ES devices. (Normally harmless motion such
tance between each blade of the attachment plug and acces- as the brushing together of your clothes fabric or the lifting
sible conductive parts (Note 1) should be more than 1M- of your foot from a carpeted floor can generate static elec-
ohm. tricity sufficient to damage an ES device.)
Note 1: Accessible Conductive Parts include Metal panels,
Input terminals, Earphone jacks,etc.
1-3
INSTRUCTION FOR "SYSTEM SW UPGRADE"
The "Upgrade" application is a tool to upgrade the software version of LST-5402(3)P Set-Top-Box. Following
operating systems are supported: Microsoft Windows 9x, Me, 2000 and XP.
For the installation procedure, please follow the steps below:
1. INSTALLATION OF "UPGRADE" APPLICATION
Please unzip the file "Upgrade.zip". The new unzipped folder contains the files shown below:
By double-clicking the "setup.exe", the file will be executed and the installation wizard starts the installation.
You only need to follow the wizard.
The default location for the "Upgrade" will be:
C:\Program Files\LGupgrade\Upgrade.exe
2. UPGRADE CABLE CONFIGURATION AND CONNECTION.
2.1 Port Configuration
- LST-5402(3)P Side : DB9 Male Type.
- Cable Side : Both Side has DB9 Female Tye.
- PC Side : DB9 Male Type
1-4
2.2. Cable Configuration
- Please use the "Null Modem Cable"
2.3. Cable Connection
1-5
3. HOW TO DO AN UPGRADE WITH "UPGRADE"
3.1. After opening the "Upgrade", you will see the following screen.
3.2. Select MODE as "Download", Type as "Prog,Data", and select Serial Port as "Com1"
or "Com2" that connected with the LST-5402(3)P.
3.3. With the "Browse" button you can select the upgrade file. After the selection, the "Start" button will be
highlighted.
1-6
3.4. Please click the "Start" button and turn your LST-5402(3)P off and on .
(Switch off and on)
You can see the upgrade process with "Upgrade" Program.
And you can see the status of upgrade procedure at the front display of LST-5402(3)P.
(UPGRADE-SW --> WRITE SW --> FINISHED )
Please wait until the end of the upgrade procedure.
LST-5402(3)P will automatically reboot the system after finishing the upgrade
1-7
SPECIFICATIONS
Television System DVB-T Australian Standard Compliant
Frequency Range VHF : 177.5 to 226.5 MHz
UHF : 529.5 to 816.5 MHz
INPUT/OUTPUT
RF Inputs ANT IN (1) 75 ohm unbalanced
RF OUT Out To TV (1)
HDMI Output HDMI Out (1), 19 pin (HDMI standard, Type A)
1080i, 720p, 576p digital RGB
Component Video Output Component Out (1 Set), Typical RCA type Jack connectors
1080i, 720p, 576p, 576i YPbPr
RGB Output RGB Out (1), 15-pin connector
1080i, 720p, 576p RGB
S-Video Output S-Video Out (1), 4-pin Mini-DIN
576i Y/C
Video Output Video Out (1), Typical RCA type Jack connector
576i Composite
Digital Audio Output Coaxial, Optical (Dolby Digital, PCM output)
Analog Audio Output Audio Out (2) (Variable Output Level)
Authorized Service Port 9-pin Serial Port (1)
Hard Disk Drive 160G Bytes (LST-5402P), 250G Bytes (LST-5403P)
Dimension (W x H X D) 430 x 76.5 x 326 mm
Weight 4.4 kg
Power Requirements AC 110-240V, 50/60Hz
Power Consumption 35W
ENVIRONMENT
Humidity 0 to 99 percent non condensing
Storage Temperature -20 to 60 degrees Celsius
Operating Temperature 0 to 40 degrees Celsius
* Design and specifications are subject to change without notice.
1-8
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS .....................................................................................................................2-2
1. Cabinet and Main Frame Section ...........................................................................................2-2
2-1
1
2
3
4
5
463
A
A42 452
250
463
463
463
A49
B
A43
1. Cabinet and Main Frame Section
2-2
A47
A46
320 463
465 B
A27
EXPLODED VIEWS
265 300
C
463
271 273
272
261 330 A26
261
D
SECTION 3
ELECTRICAL
CONTENTS
ELECTRICAL TROUBLESHOOTING GUIDE ..................................................................................................3-2
1. POWER TROUBLESHOOTING FLOW ...................................................................................................3-2
2. AUDIO TROUBLESHOOTING FLOW .....................................................................................................3-4
3. CPU(SYSTEM CONTROL) TROUBLESHOOTING FLOW ...................................................................3-13
4. VIDEO TROUBLESHOOTING FLOW....................................................................................................3-21
5. FRONT PANEL TROUBLESHOOTING FLOW .....................................................................................3-30
6. DVB-T FRONT-END TROUBLESHOOTING FLOW..............................................................................3-33
BLOCK DIAGRAM ..........................................................................................................................................3-42
1. OVERALL BLOCK DIAGRAM ...............................................................................................................3-42
2. VIDEO OUT BLOCK DIAGRAM ............................................................................................................3-44
3. AUDIO OUT BLOCK DIAGRAM........................................................................................................... 3-46
4. RF BLOCK DIAGRAM ...........................................................................................................................3-48
5. TIMER BLOCK DIAGRAM.....................................................................................................................3-50
CIRCUIT DIAGRAMS ......................................................................................................................................3-52
1. POWER(SMPS) CIRCUIT DIAGRAM_1 ...............................................................................................3-52
2. POWER(SMPS) CIRCUIT DIAGRAM_2 ................................................................................................3-54
3. CPU(LOCAL BUS) & NAND FLASH MEMORY CIRCUIT DIAGRAM..................................................3-56
4. CPU(SYSTEM IN/OUT) & BOOT FLASH & RESET & VCXO & EJTAG & RS232
CIRCUIT DIAGRAM ...............................................................................................................................3-58
5. CPU POWER/GND CIRCUIT DIAGRAM ...............................................................................................3-60
6. DDR BANK1 CIRCUIT DIAGRAM .........................................................................................................3-62
7. DDR BANK2 CIRCUIT DIAGRAM .........................................................................................................3-64
8. VIDEO CIRCUIT DIAGRAM ...................................................................................................................3-66
9. HDMI CIRCUIT DIAGRAM .....................................................................................................................3-68
10. AUDIO & OPTICAL OUT CIRCUIT DIAGRAM....................................................................................3-70
11. CPU(GPIO) & FRONT & HDD CIRCUIT DIAGRAM............................................................................3-72
12. MASTRER TUNER CIRCUIT DIAGRAM .............................................................................................3-74
13. SLAVE TUNER CIRCUIT DIAGRAM ...................................................................................................3-76
PRINTED CIRCUIT DIAGRAMS .....................................................................................................................3-78
1. MAIN P.C.BOARD (TOP VIEW) .............................................................................................................3-78
2. MAIN P.C.BOARD (BOTTOM VIEW).....................................................................................................3-80
3. POWER P.C.BOARD..............................................................................................................................3-82
4. TIMER P.C.BOARD (TOP VIEW) ..........................................................................................................3-84
5. TIMER P.C.BOARD(BOTTOM VIEW) ....................................................................................................3-84
6. KEY P.C.BOARD ....................................................................................................................................3-86
3-1
ELECTRICAL TROUBLESHOOTING GUIDE
1. POWER TROUBLESHOOTING FLOW
Start
YES
NO
Check CN2(11) is Low(0V) . Check the SMPS (AP-148) UNIT.
YES
+5VF is supplied to U13, U41, NO
+5.5VF power check CN2(2), FB43
U73(2), U78(2)
YES
+3.3V is supplied to U98, U101, NO +3.3V power check CN2(3, 4),
U2, U18, U40, U108(8), U21(15) FB44, FB45
YES
+5V is supplied to U39(10), NO
+5V power check CN2(6), FB46
U10(10), U38, U83, U84, U15
YES
+3.3V2 is supplied to U39(9), NO
+3.3V2 power check CN2(7), FB47
U10(9), U63, U76, U81,
NO
+12V is supplied to U42, U14 +12V power check CN2(8), FB48
YES
NO
+7V is supplied to U74, U104, U77 +7V power check CN2(9), FB53
YES
END
3-2
2. AUDIO TROUBLESHOOTING FLOW
(1) NO VARIABLE AUDIO L/R OUTPUT
1) Check U13 and Surroundings
NO
5V is supplied to U13(14)? Check the POWER Troubleshooting Flow
YES
NO NO
3.072MHz clock is input to U13(3)? Fig.01 Check 3.072MHz Clock output at R76.
YES
NO NO
48KHz clock is input to U13(4)? Fig.02 Check 48KHz Clock output at R77.
YES
12.288MHz clock is input to U13(5)? NO Check 12.288MHz Clock
Fig.03 output at R81, R82.
YES NO
Check 27MHz clock is input to the U17(2)
NO NO
Data signal is input to U13(2)? Fig.04 Check Data signal output at R79.
YES
NO
U13(13) is grounded? Check soldering.
YES
Analog audio signal from U13(12 &15) NO
Check U13 and surroundings.
Fig.05
Check U1 and surroundings.
3-3
Fig.01 Fig.02
3.072MHz clock 48KHz clock
+3.3V
R73 Audio_Mute_V
1K
FB23
R75 1K 60/900mA_
U13
6 DIF1 MUTEC 16
7 C40
DIF0 100nF
AV_RST_n AV_RST_n 1 15
RST AOUTL
VA 14
2 SDATA AGND 13
3 SCLK/DEM1 AOUTR 12
4 LRCK
ACLK1 5 11
MCLK REF_GND
VQ 10
8 DEM0 FILT+ 9
R194 R195 R196 +
CS4340/SOIC C42 CR59
10K 10K 10K 100nF 2.2uF/50V
SPDIF
Fig.03 +3.3V
12.28880MHz
Fig.04 Fig.05
Data Signal Analog audio signal
3-4
2) Check U14 and Surroundings
NO
12V is supplied to R94? Check the POWER Troubleshooting Flow
YES
NO
6.254V is supplied to U14(3 & 5)? Check R93, R94, R95
YES
Analog audio signal is output from NO
Check U14 and surroundings
U14(1, 7)? Fig.06
3) Check Output Jack and Surroundings
Check U52, U55, J3 and their
surroundings and cable
R83 75K
4
CR60 R84 43K U14A
CR61 R85 1K L1 1.8uH_2012
2 -
+
+
1
10uF/16V_5X11 3 +
TL082C 10uF/16V_5X11 R86
8
+12V C45 100K*
100nF
R87 75K
Fig.06 +12V
Analog audio output
8
CR62 R89 43K U14B
CR63 R90 1K L2 1.8uH_2012
6 -
+
+
7
10uF/16V_5X11 5 +
TL082C 10uF/16V_5X11
R91
4
100K*
+12V
R93 4.7K R94 10
3-5
(2) NO VARIABLE AUDIO L/R OUTPUT
1) Check U13 and Surroundings
NO
5V is supplied to U42(14)? Check the POWER Troubleshooting Flow
YES
NO NO
3.072MHz clock is input to U42(3)? Fig.07 Check 3.072MHz Clock output at R76.
YES
NO Check 48KHz Clock output at R77. NO
48KHz clock is input to U42(4)? Fig.08
YES
12.288MHz clock is input to U42(5)? NO Check 12.288MHz Clock output at R81,
Fig.09 R92.
YES NO
Check 27MHz clock is input to the U17(2)
NO NO
Data signal is input to U42(2)? Fig.10 Check Data signal output at R88.
YES
NO
U42(13) is grounded? Check soldering.
YES
Analog audio signal from U42(12, 15) NO
Check U14 and surroundings.
Fig.11
Check U1 and surroundings.
3-6
Fig.07 Fig.08
3.072MHz clock 48KHz clock
+3.3V
R73 Audio_Mute_V
1K
FB23
R75 1K 60/900mA_
U13
6 DIF1 MUTEC 16
7 C40
DIF0 100nF
AV_RST_n AV_RST_n 1 15
RST AOUTL
VA 14
2 SDATA AGND 13
3 SCLK/DEM1 AOUTR 12
4 LRCK
ACLK1 5 11
MCLK REF_GND
VQ 10
8 DEM0 FILT+ 9
R194 R195 R196 +
CS4340/SOIC C42 CR59
10K 10K 10K 100nF 2.2uF/50V
SPDIF
Fig.09 +3.3V
12.28880MHz
Fig.10 Fig.11
Data Signal Data Signal
3-7
2) Check U14 and Surroundings
NO
12V is supplied to R223? Check the POWER Troubleshooting Flow
YES
NO
6.254V is supplied to U42(3 & 5)? Check R222, R223, R224
YES
Analog audio signal is output from NO
Check U42 and surroundings
U42(1,7)? FIG.12
3) Check Output Jack and Surroundings
Check U52, U55, J3 and their
surroundings and cable
R83 75K
4
CR60 R84 43K U14A
CR61 R85 1K L1 1.8uH_2012
2 -
+
+
1
10uF/16V_5X11 3 +
TL082C 10uF/16V_5X11 R86
8
+12V C45 100K*
100nF
R87 75K
Fig.06 +12V
Analog audio output
8
CR62 R89 43K U14B
CR63 R90 1K L2 1.8uH_2012
6 -
+
+
7
10uF/16V_5X11 5 +
TL082C 10uF/16V_5X11
R91
4
100K*
+12V
R93 4.7K R94 10
3-8
(3) NO OPTICAL OUTPUT AUDIO
NO
SPDIF pulse is input to R80? FIG.13 Check U1, and surroundings
YES
NO
3.3V is supplied J9(2) Check the POWER Troubleshooting Flow
YES
SPDIF pulse is inpt to J9(1)? NO
Check FB31, R100
YES
NO
J9(3) is grounded? Check soldering.
YES
Check J9 and surroundings and cable
+3.3V2
FB30
Optical out
60/900mA_2012
FB31
R100 60/900mA_2012 J9
SPDIF 1 2
INPUT VCC
68 C50
100nF
GND 3
Fig.13 VST5S
SPDIF audio output
3-9
(4) NO COAXIAL OUTPUT AUDIO
NO
SPDIF pulse is input to U15(1)? FIG.14 Check U1 and surroundings
YES
NO Check FB28 and the POWER
5V is supplied U15(14)
Troubleshooting Flow
YES
NO
U15(7) is grounded? Check soldering.
YES
NO
SPDIF pulse is output from U15(8,10,12) Check U15 and surroundings
YES
NO
SPDIF pulse is input to J2(7)? Check C49, R97, FB29
YES
NO
J2(8) is grounded? Check soldering.
YES
Check J2 and surroundings and cable
FB28
/900mA_2012
C48
100nF
R96 R99
470K 2.2K
14
U15
Coaxial out
1 1 2
3 4
5 6
9 8 FB29 J2B S-R
C49 R97 470/700mA_2012
11 10 7
13 12 100nF 330
8
Fig.14 MM74HCT04
R98
7
91
SOIC14-150-1.27
Coaxial audio output
3-10
(5) NO HDMI OUTPUT AUDIO
NO
Check HDMI cable is connected Connect HDMI cable
YES
NO Check current display mode is HDMI
Check AV Mode On TV resolution
1080i/720p/576p Using VFD message.
YES
Check HDMI Output Signal; J11(1,3)=DATA2, NO
J11(4,6)=DATA1, J11(7,9)=DATA0, J11(10,12)=CLOCK Check the J11 & HDMI cable
Using Oscilloscope with 5Gs Sampling rate.
YES
HP_PLUG is operated normally? NO
Check HP_PLUG:J11(19) is Check Q27 base voltage. Must be HIGH.
ON(=High=5V) If not, check Q27
YES
* DDC IIC is operated normally? NO
Check DDC_SCL:J11(15), Check the J11 & HDMI cable
DDC_SDA:J11(15)
YES
HDMI IIC is operated normally? NO
Check HDMI_SCL:U63(43), Check the U63
HDMI_DATA:U63(44)
YES
Check the Power is supplied to NO
U83(2)=1.8V, U84(2)=3.3V, FB50(1)=3.3V Check the U83(3), U84(3)
YES
Next to Sheet
3-11
NO
3.072MHz clock is input to U63(12)? Check 3.072MHz Clock output at R76.
YES
NO
48KHz clock is input to U63(11)? Check 48KHz Clock output at R77.
YES
NO Check 12.288MHz Clock output at R81,
12.288MHz clock is input to U63(6)?
R82.
YES
NO
Data signal is input to U63(10)? Check Data signal output at R79.
YES
Check J2 and surroundings and cable
3-12
3. CPU(SYSTEM CONTROL) TROUBLESHOOTING FLOW
Start
YES
NO
Power is supplied normally? (A) Power check
YES
NO
Clock signals are OK? (B) Clock check
YES
Reset signals are OK at the time of NO
(C) Reset check
power-on reset?
YES
NO
Chip selection signals are OK? (D) CS check
YES
NO
IIC channels are OK? (E) IIC check
YES
NO
Interrupt signals are OK? (F) Interrupt check
YES
Messages are output through NO
(G) RS-232C check
RS-232C port on PC terminal?
YES
END
3-13
(A) Power check
YES
2.5V and 1.2V is output from U98(4), NO Power Supply Check
U98(4) : 2.5V
U101(5)? U101(5) : 1.2V
YES
NO Power Supply Check
3.3V is output from U98(2), U101(4)?
U98(2), U101(4): 3.3V
YES
Check U98, U101
3-14
(B) Clock check
27MHz clock is output from U17(12)?
Fig.01
NO
YES
Check 27MHz clock is input to the U17(2) Check the U1 and surroundings
NO
Check and Y1 and surroundings
U17
VCX0
VCXO
R102 6.2K 10 R101 22
ACLK
5 VIN R103 56 1
1
27MHz 12
CR14 C51
F/16V_5x11 100nF
2
VDD 3 +3.3V
VDD 4
13 ACS0 VDD 14
16 C52 C53 C54
ACS1 100nF 100nF 100nF
9 ACS2 NC 15
Fig.01 2 X1 PDTS 8
27MHz Clock Y1
27MHz GND 6
7
GND
1 X2 GND 11
C55 C56
24pF 18pF MK3722
3-15
(C) Reset check
U106(7) is output from the reset? (POWER YES
Check the U106 and surroundings
ON) Fig.02
NO
U13(1), U41(1), U75(5), U80(5) is YES
input to the reset? Check the U(1) and surroundings
(Standby mode ON)
RESET
+3.3V +3.3V
R419
R411 R412
10K* 0 4.7K
U108
1 MR WDS 5
2 6 WDI
SWT WDI
3 SRT RESET 7
68nF_10%
Fig.02 F_10%
4 GND VCC 8 1 +3.3V R414 R
100K 1
Reset signal C361 C359 MAX6746KA29 CR328
100uF/16V_5x11
C360
2
100nF
3-16
(D) CS check
YES
Logic low pulse is seen at U2(9)? FIG.03 Check the U1 and surroundings
NO
YES
Logic low pulse is seen at U18(1)? Check the U1 and surroundings
NO
YES
Logic low pulse is seen at CN5(3) Check the U1 and surroundings
U2
NAND FLASH
LBUS_D7 44 1
LBUS_D6 I/O_7 NC1
43 I/O_6 NC2 2
LBUS_D5 42 3
LBUS_D4 I/O_5 NC3
41 I/O_4 NC4 4
LBUS_D3 32 5
LBUS_D2 I/O_3 NC5
31 I/O_2 NC6 10
LBUS_D1 30 11
LBUS_D0 I/O_1 NC7
29 I/O_0 NC8 14
NC9 15
NC10 20
LBUS_WRH_n 16 21
LBUS_AS_n CLE NC11
17 ALE NC12 22
NAND_CS2_n 9 23
LBUS_RD_n CE NC13
8 RE NC14 24
LBUS_WRL_n 18 25
WE NC15
WP_n 19 WP NC16 26
Fig.03 LBUS_RDY0 7
NC17 27
28
R/B NC18
Chip select signal +3.3V NC19 33
34
NC20
NC21 35
+3.3V 12 39
Vcc1 NC22
37 Vcc2 NC23 40
NC24 45
NC25 46
C1 C2 6 47
GND NC26
13 GND NC27 48
100nF 100nF 36 38
GND LOCK
K9F2808U0C
3-17
(E) IIC check
IIC SDA and SCL signals are output YES
from R10, R11? Check the U1 and surroundings
Fig.04
NO
IIC SCL and SDA signals are output from YES
Check the U1 and surroundings
R306, R307?
(F) Interrupt check
YES
Logic low pulse is input to U63(17)? Fig,05 Check the U1 and surroundings
3-18
+3.3V2
R245
10K R246 HDMI Transmitter
10K
U63 +3.3V2
R248 390_1%
42 24 EXT_SW
RESET# EXT_SWNG
17 35 HDMI_TX2-
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