SR906SB
JUNE, 2011AFN33798528 : ON/P
5.1ch SURROUND COMPACT
RECEIVER SYSTEM
SERVICE MANUAL
MODEL: SR906SB
(SR906SB, SH96SB-S/ F/ C, SH95TA-W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
Website http://biz.lgservice.com
Internal Use Only
MODEL: SR906SB (SR906SB, SH96SB-S/ F/ C, SH95TA-W)SERVICE MANUAL
1-1
CONTENTS
SECTION 1 ........ SUMMARY
SECTION 2 ........ ELECTRICAL
SECTION 3 ........ CABINET & MAIN CHASSIS
SECTION 4 ........ REPLACEMENT PARTS LIST
1-2
SECTION 1
SUMMARY
CONTENTS
PRODUCT SAFETY SERVICING GUIDELINES FOR AV RECEIVER SYSTEM PRODUCTS................ 1-3
SERVICING PRECAUTIONS .......................................................................................................................... 1-4
• GENERAL SERVICING PRECAUTIONS
• INSULATION CHECKING PRODEDURE
• ELECTROSTATICALLY SENSITIVE (ES) DEVICES
SERVICE INFORMATION FOR EEPROM (MICOM) .................................................................................... 1-5
VERIFICATION PROGRAM VERSION AND MICOM OPTION ................................................................... 1-6
FIRMWARE UPDATE ...................................................................................................................................... 1-7
SPECIFICATIONS ............................................................................................................................................ 1-8
1-3
PRODUCT SAFETY SERVICING GUIDELINES
FOR AV RECEIVER SYSTEM PRODUCTS
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 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 des-
ignators and are required to maintain safe performance. No deviations are allowed
without prior approval by LG 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 cus-
tomized 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 equi-
lateral triangle is intended to convey to the service personnel the
following fuse replacement caution notice:
CAUTION : FOR CONTINUED PROTECTION AGAINST RISK
OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND
RATING AS MARKED NEAR EACH FUSE.
SERVICE INFORMATION
While servicing, use an isolation transformer for protection from AC line shock. After
the original service problem has been corrected, make a check of the 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 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 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 volt-
age 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 measure-
ments 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 instal-
lations.
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 exten-
sions, sprouting from a single outlet, can lead to disastrous consequences to
home and family.
1-4
SERVICING PRECAUTIONS
CAUTION: Before servicing the AV RECEIVER SYSTEM cov-
ered by this service data and its supplements and addends,
read and follow the SAFETY PRECAUTIONS.
NOTE: if unforeseen circumstances create conflict between
the following servicing precautions and any of the safety
precautions in this publications, always follow the safety pre-
cautions.
Remember Safety First :
General Servicing Precautions
1. Always unplug the AV RECEIVER SYSTEM 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 electro-
lytic capacitor.
Caution : A wrong part substitution or incorrect polar-
ity installation of electrolytic capacitors may result in an
explosion hazard.
2. Do not spray chemicals on or near this AV RECEIVER
SYSTEM or any of its assemblies.
3. Unless specified otherwise in this service data, clean elec-
trical 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 AV RECEIVER SYSTEM
and / or any of its electrical assemblies unless all solidstate
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 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 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 cir-
cuit, 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
SERVICE INFORMATION FOR EEPROM (MICOM)
1. ENTER THE MICOM OPTION CHANGING MODE
1)
At any function, press front ‘STOP’ button and remote control ‘2’ key for 5 seconds. Enter the MICOM option setting menu.
2. ADJUST MICOM OPTION USING REMOTE CONTROL DIRECTION KEY
1) Using up / down direction key (preset +, -), change option value.
2) Using left / right direction key (tunning +, -), select next option.
DETECT NEW EEPROM
(OPTION EDIT SCREEN)
NAME HEX
OP0
OP1
OP2
OP3
OP4
OP5
3. COMPLETE OPTION CHANGING.
1) After entering option code, press ‘ENTER’ key. You can confi rm ‘WRITE OK’.
2) Next, press front ‘STOP’ button and remote control ‘2’ key. ‘E2P CLR’ display on VFD.
Finish option code changing.
09
BE
20
C6
00
C0
1-6
VERIFICATION PROGRAM VERSION AND MICOM OPTION
2. RETURN TO FUNCTION
1) After checking, press remote control ‘PLAY’ key for 5 seconds.
Return to function that before you’re set.
1. ENTER THE VERIFICATION MODE
1) At any function, press front ‘STOP’ button and remote control ‘PLAY’ key for 5 seconds.
Enter the Program Version and MICOM Option code verifi cation mode.
2) Using left/right key, you can confi rm program version and MICOM option.
MICOM Version
MICOM option
DSP Version
MCS Version
1-7
3. AFTER UPDATE COMPLETE
1) Power off / on automatically after update complete.
2) Tray will be closed.
1. COPY AN UPDATE FILE TO USB (USB OR CD-ROM)
Update File Name: MICOM_SR906_1XXXXXX.hex
MCS_SR906_1XXXXXX.bin
DSP_SR906_1XXXXXX.hex
1) An update fi le have to be copied onto the root of fi le system.
And fi les are all erased except update fi le.
FIRMWARE UPDATE
2. UPDATE FIRMWARE
1) Insert USB which has an update fi le.
2) VFD responds to update event.
3) VFD is shown as below.
UPGRADE
Front Panel contents:
1-8
SPECIFICATIONS
• GENERAL
Power requirements Refer to main label on the rear panel.
Power consumption Refer to main label on the rear panel.
Dimensions (W x H x D) Approx. 430 x 60 x 243.5 mm (16.9 x 2.4 x 9.2 inches)
Net Weight (Approx.) 2.9 kg (6.4 lbs)
Operating temperature 5 °C to 35 °C (41 °F to 95 °F)
Operating humidity 5 % to 90 %
Bus Power Supply (USB) DC 5 V 1 mA
• INPUTS/OUTPUTS
HDMI IN/OUT (video/audio) 19 pin (Type A, HDMI™ Connector)
ANALOG AUDIO IN 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R) x 1
DIGITAL IN (OPTICAL) 3 V (p-p), Optical jack x 2
DIGITAL IN (COAXIAL) 3 V (p-p), Coaxial jack x 1
PORT. IN 0.5 Vrms ( ø 3.5 mm stereo jack)
• TUNER
FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz
AM Tuning Range 520 to 1,710 kHz
• AMPLIFIER
Power output (4 Ω/ 3 Ω), (RMS), THD 10 %
Total 1100 W
Front 180 W x 2
Center 180 W
Rear 180 W x 2
Sub-Woofer 200 W (Passive)
1-9
• SPEAKERS
Front speaker (Left/ Right)
Type 2 Way 2 speaker
Impedance Rated 4 Ω
Input Power 180 W
Max. Input power 360 W
Net Dimensions (W x H x D) 94 x 211 x 83 mm (3.7 x 8.3 x 3.3 inches)
Net Weight 0.7 kg (1.5 lbs)
Rear speaker (Left/ Right)
Type 1 Way 1 speaker
Impedance Rated 4 Ω
Input Power 180 W
Max. Input power 360 W
Net Dimensions (W x H x D) 94 x 182 x 83 mm (3.7 x 7.2 x 3.3 inches)
Net Weight 0.61 kg (1.34 lbs)
Center speaker
Type 2 Way 3 speaker
Impedance Rated 4 Ω
Input Power 180 W
Max. Input power 360 W
Net Dimensions (W x H x D) 327 x 99 x 76 mm (12.9 x 3.9 x 3.0 inches)
Net Weight 1.21 kg (2.67 lbs)
Subwoofer
Type 1 Way 1 speaker
Impedance Rated 3 Ω
Input Power 200 W
Max. Input power 400 W
Net Dimensions (W x H x D) 190 x 385 x 318 mm (7.5 x 15.2 x 12.5 inches)
Net Weight 5 kg (11 lbs)
1-10
MEMO
2-1
SECTION 2
ELECTRICAL
CONTENTS
ONE PONIT REPAIR GUIDE .......................................................................................................................... 2-2
1. NO POWER PROBLEM ......................................................................................................................... 2-2
2. AMP POWER PROBLEM ....................................................................................................................... 2-4
3. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR
“WELCOME” ON FRONT PANEL .......................................................................................................... 2-5
4. BAD HDMI VIDEO / AUDIO OUTPUT .................................................................................................... 2-6
5. BAD HDMI VIDEO / AUDIO INPUT ........................................................................................................ 2-7
6. BAD USB FUNCTION ............................................................................................................................. 2-8
7. NO SPEAKER OUTPUT ......................................................................................................................... 2-9
ELECTRICAL TROUBLESHOOTING GUIDE ............................................................................................. 2-12
1. POWER SUPPLY ON SMPS BOARD .................................................................................................. 2-12
2. POWER SUPPLY ON MAIN BOARD ................................................................................................... 2-15
3. POWER SUPPLY ON AMP BOARD .................................................................................................... 2-16
4. POWER SUPPLY ON FRONT BOARD ............................................................................................... 2-17
5. SYSTEM PART ..................................................................................................................................... 2-18
6. NO AUDIO OUTPUT ............................................................................................................................ 2-19
7. NO USB FUNCTION ............................................................................................................................. 2-21
8. NO HDMI OUTPUT ............................................................................................................................... 2-22
9. NO HDMI INPUT ................................................................................................................................... 2-23
WAVEFORMS ................................................................................................................................................. 2-24
1. SYSTEM PART-1 (MICOM) .................................................................................................................. 2-24
2. SYSTEM PART-2 (HDMI) ..................................................................................................................... 2-25
3. AUDIO PART-1 (DSP) .......................................................................................................................... 2-26
4. AUDIO PART-2 (DIR) ........................................................................................................................... 2-27
5. AUDIO PART-3 (MCS) ......................................................................................................................... 2-28
6. AUDIO PART-4 (PWM) ......................................................................................................................... 2-29
WIRING DIAGRAM ........................................................................................................................................ 2-31
BLOCK DIAGRAM ......................................................................................................................................... 2-33
CIRCUIT DIAGRAMS .................................................................................................................................... 2-35
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 2-35
2. AUDIO MICOM CIRCUIT DIAGRAM .................................................................................................... 2-37
3. AUDIO DSP CIRCUIT DIAGRAM ......................................................................................................... 2-39
4. HDMI CIRCUIT DIAGRAM.................................................................................................................... 2-41
5. ADC / DIR CIRCUIT DIAGRAM ............................................................................................................ 2-43
6. MCS CIRCUIT DIAGRAM ..................................................................................................................... 2-45
7. PWM CIRCUIT DIAGRAM .................................................................................................................... 2-47
8. AMP CIRCUIT DIAGRAM ..................................................................................................................... 2-49
9. FRONT CIRCUIT DIAGRAM ................................................................................................................ 2-51
10. VOLUME CIRCUIT DIAGRAM .............................................................................................................. 2-53
CIRCUIT VOLTAGE CHART ........................................................................................................................ 2-55
PRINTED CIRCUIT BOARD DIAGRAMS .................................................................................................... 2-57
1. MAIN P. C. BOARD .............................................................................................................................. 2-57
2. SMPS P. C. BOARD ............................................................................................................................. 2-59
3. AMP P. C. BOARD ............................................................................................................................... 2-61
4. FRONT P. C. BOARD ........................................................................................................................... 2-63
5. VOLUME P. C. BOARD ........................................................................................................................ 2-65
2-2
ONE POINT REPAIR GUIDE
1. NO POWER PROBLEM
No power problem occurs when you power on the unit.
1-1. FUSE & BRIDGE DIODE
1-1-1. Solution
Replace F901, BD901 on SMPS board.
1-1-2. How to troubleshoot (Countermeasure)
1) Look at the physical of fuse F901.
2) Check the bridge diode BD901.
1-1-3. Service hint (Any picture / Remark)
< SMPS board top view >
< Fuse, F901 >
Can look at physical condition
2-3
ONE POINT REPAIR GUIDE
No power problem occurs when you power on the unit.
1-2. VFD, 12 V, 6 VA, 3.7 VA
1-2-1. Solution
Replace D927, D926, D921, D922, D923, D925, IC901, IC951.
1-2-2. How to troubleshoot (Countermeasure)
Case 1) FLD Abnormal: Check D927, D926 and replace it.
Case 2) 6 VA Abnormal: Check D921 and replace it.
Case 3) 12 VA Abnormal: Check D925, IC951 and replace it.
Case 4) 3.7 VA Abnormal: Check D922, D923 and replace it.
Case 5) All Voltage Abnormal: Check IC901 and replace it.
1-2-3. Service hint (Any picture / Remark)
< SMPS board bottom view >
Case 5
Case 1
Case 2
Case 4
Case 3
Case 3
Case 5
Case 2
Case 1
Case 4
2-4
ONE POINT REPAIR GUIDE
2. AMP POWER PROBLEM
AMP VCC doesn’t work.
2-1. ABNORMAL SOUND
2-1-1. Solution
Refer to “How to troubleshoot (Countermeasure)”.
2-1-2. How to troubleshoot (Countermeasure)
Case 1) 36 V Abnormal: Replace PC902 or PC903 on SMPS board.
Case 2) 36 V Abnormal: Replace IC902/ Q901 or D928 on SMPS board.
2-1-3. Service hint (Any picture / Remark)
< SMPS board bottom view >
Case 1
Case 2
Case 1
Case 1
Case 2
Case 2
2-5
ONE POINT REPAIR GUIDE
3. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE OR
“WELCOME” ON FRONT PANEL
When you turn on your set, it will blank / no message or “WELCOME” display on front panel, and it
will not boot-up.
3-1. D101 (NO 3.3 VA)
3-1-1. Solution
Replace D102 on MAIN board.
3-1-2. How to troubleshoot (Countermeasure)
1) Please check 3.7 VA(yellow signal).
2) If 3.7 VA is abnormal, please check SMPS board.
3) If 3.7 VA is OK, but 3.3 VA is abnormal, replace D102.
3-1-3. Service hint (Any picture / Remark)
< MAIN board bottom view >
D102
A:3.7VA
B:3.3VA
2-6
ONE POINT REPAIR GUIDE
4. BAD HDMI VIDEO / AUDIO OUTPUT
When unit is connected to HDMI TV using HDMI cable, picture shows bad color, no output or mixed
color on the screen. But component output is OK.
4-1. HDMI JACK (JK802)
4-1-1. Solution
Replace JK802 (HDMI Jack).
4-1-2. How to troubleshoot (Countermeasure)
1) Check JK802 pin soldering.
2) If there is short soldering on pin JK802, re-soldering pin JK802.
3) If problem still occurs, check L808 ~ L811.
4) Check X800 waveform. If it is abnormal signal, replace X800.
5) If issue still NG, replace IC800.
4-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC800
JK802
X800
2-7
ONE POINT REPAIR GUIDE
5. BAD HDMI VIDEO / AUDIO INPUT
When unit is connected to HDMI in(1 or 2, 3) using HDMI cable, picture shows bad color, no output
or mixed color on the screen.
5-1. HDMI JACK (JK801 OR JK800, JK803)
5-1-1. Solution
Replace JK801 or JK800, JK803 (HDMI Jack).
5-1-2. How to troubleshoot (Countermeasure)
1) Check JK801 or JK800, JK803 pin soldering.
2) If there is short soldering on pin JK801 or JK800, JK803 re-soldering pin JK801 or JK800, JK803.
3) If problem still occurs, check R803 ~ R826:
If issue still NG, replace IC800.
5-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
JK803
IC800
JK801 JK800
X800
2-8
ONE POINT REPAIR GUIDE
6. BAD USB FUNCTION
When USB memory is connected to USB jack, It can’t recognize automatically.
6-1. USB JACK (JK301)
6-1-1. Solution
Replace JK301 (USB Jack)
6-1-2. How to troubleshoot (Countermeasure)
1) Check JK301 pin soldering.
2) If there is short soldering on pin JK301, re-soldering pin JK301.
3) Check FFC wafer CN101 and CN301’s soldering status,
If issue is still NG, check FFC cable status.
4) Check X500’s waveform. If it is abnormal signal, replace X500.
5) If issue is still NG, replace IC500.
6-1-3. Service hint (Any picture / Remark)
< FRONT board top view > < MAIN board top view >
IC301
CN301
IC500
X500
CN101
2-9
ONE POINT REPAIR GUIDE
7. NO SPEAKER OUTPUT
When unit is connected to Speaker using speaker cable, no speaker output.
7-1. IN OPTICAL / COAXIAL INPUT
7-1-1. Solution
Replace IC401
7-1-2. How to troubleshoot (Countermeasure)
1) Check signal at X400.
- If the clock doesn’t come out, replace X400.
2) Check signal at IC401 pin9, 10.
- If the clock doesn’t come out, check I2C trace or IC100.
3) Check the signal of IC402 pin12, 14, 16, 18
- If the clock doesn’t come out, check I2S trace or IC200.
4) If problem still occurs, replace MAIN board
7-1-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC401
IC402
X400
IC401
IC100
IC200
2-10
ONE POINT REPAIR GUIDE
When unit is connected to Speaker using speaker cable, no speaker output.
7-2. IN PORTABLE / AUX / TUNER INPUT
7-2-1. Solution
Replace IC400.
7-2-2. How to troubleshoot (Countermeasure)
1) Check IC400 pin7 ~ 12.
- If the analog signal doesn’t come out, check the signal trace.
2) Check signal at IC400 pin1, 2
- If the clock doesn’t come out, check I2C trace or IC100.
3) Check the signal of IC400 pin 42, 43, 44.
- If the clock doesn’t come in, check I2S trace or IC401.
4) Check the signal of IC400 pin41.
- If the clock doesn’t come out, replace IC400.
7-2-3. Service hint (Any picture / Remark)
< MAIN board bottom view >
IC400
Loading...