SHARP LC-13B4E Service Manual
LC-13B4E
1st Edition
LC-15B4E
SERVICE MANUAL
S53A6LC-13B4E
LCD COLOUR TELEVISION
LC-13B4E
MODELS
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored
to its original condition and only parts identical to those specified should be used.
CONTENTS
» IMPORTANT SERVICE SAFETY PRECAUTION ........................................................................................2
» SPECIFICATIONS ........................................................................................................................................4
» OPERA TION MANUAL .................................................................................................................................5
» DIMENSIONS ...............................................................................................................................................7
» REMOVING OF MAJOR PARTS ..................................................................................................................9
» ADJUSTING PROCEDURE OF EACH SECTION .....................................................................................13
» TROUBLE SHOOTING TABLE...................................................................................................................17
» CHASSIS LA YOUT .....................................................................................................................................23
» BLOCK DIAGRAM ......................................................................................................................................24
» OVERALL WIRING DIAGRAM ...................................................................................................................26
» DESCRIPTION OF SCHEMATIC DIAGRAM .............................................................................................28
» SCHEMATIC DIAGRAM .............................................................................................................................29
» PRINTED WIRING BOARD ASSEMBLIES................................................................................................55
» REPLACEMENT PARTS LIST....................................................................................................................65
» PACKING OF THE SET ..............................................................................................................................79
LC-15B4E
Page
SHARP CORPORATION
LC-13B4E
LC-15B4E
DESCRIPTION OF SCHEMATIC DIAGRAM
VOLTAGE MEASUREMENT CONDITION:
1. The voltages at test points are measured on
exclusive AC adaptor and the stable supply voltage
of AC 120V. Signals are fed by a color bar signal
generator for servicing purpose and the above
voltages are measured with a 20k ohm/V tester.
INDICATION OF RESISTOR & CAPACITOR:
RESISTOR
1. The unit of resistance “Ω” is omitted.
(K=kΩ=1000 Ω, M=MΩ).
2. All resistors are ± 5%, unless otherwise noted.
(J= ± 5%, F= ± 1%, D= ± 0.5%)
3. All resistors are 1/16W, unless otherwise noted.
4. All resistors are Carbon type, unless otherwise
noted.
C
: Solid
S : Oxide Film T : Special
N : Metal Coating
CAPACITOR
1. All capacitors are µF, unless otherwise noted.
(P=pF=µµF).
2. All capacitors are 50V, unless otherwise noted.
3. All capacitors are Ceramic type, unless otherwise
noted.
(ML): Mylar (TA): Tantalum
(PF): Polypro Film (ST): Styrol
W
: Cement
CAUTION:
This circuit diagram is original one, therefore there may be a
slight difference from yours.
IMPORTANT SAFETY NOTICE:
PARTS MARKED WITH “å” ( ) ARE
IMPORTANT FOR MAINTAINING THE SAFETY OF
THE SET. BE SURE TO REPLACE THESE PARTS
WITH SPECIFIED ONES FOR MAINTAINING THE
SAFETY AND PERFORMANCE OF THE SET.
28
LC-13B4E
2
2
LC-15B4E
IMPORTANT SERVICE SAFETY PRECAUTION
Ë
Service work should be performed only by qualified service technicians who are thoroughly
familiar with all safety checks and the servicing guidelines which follow:
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
CAUTION: FOR CONTINUED PROTECTION
AGAINST A RISK OF FIRE REPLACE ONLY WITH
SAME TYPE F3301(2A, 250V), F3302(1.25A, 250V),
F6500 (1.25A, 250V) AND F6501 (1.25A, 250V)
FUSE.
BEFORE RETURNING THE RECEIVER
(Fire & Shock Hazard)
Before returning the receiver to the user, perform
the following safety checks:
1. Inspect all lead dress to make certain that leads are
not pinched, and check that hardware is not lodged
between the chassis and other metal parts in the
receiver.
2. Inspect all protective devices such as non-metallic
control knobs, insulation materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacitor networks, mechanical
insulators, etc.
3. To be sure that no shock hazard exists, check for
leakage current in the following manner.
• Plug the AC cord directly into a 110~240 volt AC outlet,
and connect the DC power cable into the receiver's
DC jack. (Do not use an isolation transformer for this
test).
• Using two clip leads, connect a 50k ohm, 10 watt resistor
paralleled by a 0.15µF capacitor in series with all
exposed metal cabinet parts and a known earth ground,
such as electrical conduit or electrical ground connected
to an earth ground.
• Use an AC voltmeter having with 5000 ohm per volt, or
higher, sensitivity or measure the AC voltage drop
across the resistor.
• Connect the resistor connection to all exposed metal
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
escutcheon, etc.) and measure the AC voltage drop
across the resistor.
All checks must be repeated with the AC cord plug
connection reversed. (If necessary, a nonpolarized
adaptor plug must be used only for the purpose of
completing these checks.)
Any reading of 0.75V peak (this corresponds to 0.5
mA. peak AC.) or more is excessive and indicates a
potential shock hazard which must be corrected before
returning the monitor to the owner.
DVM
AC SCALE
50k ohm
10W
0.15 µF
TEST PROBE
TO EXPOSED
METAL PARTS
CONNECT TO
KNOWN EARTH
GROUND
234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121
SAFETY NOTICE
Many electrical and mechanical parts in LCD television
have special safety-related characteristics.
These characteristics are often not evident from visual
inspection, nor can protection afforded by them be
necessarily increased by using replacement components
rated for higher voltage, wattage, etc.
Replacement parts which have these special safety
characteristics are identified in this manual; electrical
and shaded areas in the
Schematic Diagrams.
For continued protection, replacement parts must be
identical to those used in the original circuit.
The use of a substitute replacement parts which do not
have the same safety characteristics as the factory
recommended replacement parts shown in this service
manual, may create shock, fire or other hazards.
components having such features are identified by “ å”
234567890123456789012345678901212345678901234567890123456789012123456789012345678901234567890121
2
Replacement Parts Lists and
Precautions for using lead-free solder
1 Employing lead-free solder
"All PWBs" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on
the PWBs and service manuals. The alphabetical character following LF shows the type of lead-free solder.
Example:
L Fa
Indicates lead-free solder of tin, silver and copper.
2 Using lead-free wire solder
When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional
lead wire solder may cause damage or accident due to cracks.
As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40°C, we recommend
you to use a dedicated soldering bit, if you are not familiar with how to obtain lead-free wire solder or soldering
bit, contact our service station or service branch in your area.
3 Soldering
As the melting point of lead-free solder (Sn-Ag-Cu) is about 220°C which is higher than the conventional lead
solder by 40°C, and as it has poor solder wettability , you may be apt to keep the soldering bit in contact with the
PWB for extended period of time. However, Since the land may be peeled off or the maximum heat-resistance
temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering
condition.
Lead-free solder contains more tin, and the end of the soldering bit may be easily corroded. Make sure to turn on
and off the power of the bit as required.
If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder. Clean the bit
after every use of it.
When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper.
LC-13B4E
LC-15B4E
Be careful when replacing parts with polarity indication on the PWB silk.
Lead-free wire solder for servicing
Part No, ★ Description Code
ZHNDAi123250E J φ0.3mm 250g(1roll) BL
ZHNDAi126500E J φ0.6mm 500g(1roll) BK
ZHNDAi12801KE J φ1.0mm 1kg(1roll) BM
3
BLOCK DIAGRAM
LC-13B4E
LC-15B4E
H
SC3901
ANTENNA
SCART
TUNER
(AV1)
AUDIO IN TV_V
G
F
SC5001
AUDIO OUT
VIDEO OUT
SDA/RXD
SCL/TXD
VIDEO IN
SC_R/G/B
S
2
I
C/UART
SY
V1.SY
TV/AV
SELECTOR
IC806
SC
(AV2) INPUT
J5003
E
J5001
VIDEO
(AV2) INPUT
AUDIO
V1_V
V1.L/R
SIF1
AI_L/R
I2C
SC_L/RO
CHROMA
SELECTOR
IC803
AUDIO AMP
IC1902
AMP
IC808
AMP
IC808
(AV2) INPUT
ANA_IN1+
SC2_IN_L/R
SC1_OUT_L/R
SC1_IN_L/R
CVBS/SY_IN
R/G/B_IN
SC_IN
MSP
IC1901
VPC
IC801
V2VO
SYNC SEP
IC802
2
I
C
UART
E2PROM
IC2010
CSYNC
DACM_L/R
2
I
DACA_L/R
I2C
MICON
IC2001
C
AUDIO AMP
IC304
SC2_OUT_L/R
VPC0~7
SYNC SIGNAL
CONTROL SIGNAL
2
PROM
E
IC2008
RESET
RESET
IC2006
OSD R/G/B
L_ERR
AUDIO ACTIVE FILTER
IC1905
AUDIO AMP
IC3501
~7
YIN0
DPS
IC1201
OFL1
VPC
R/G/B/FB
LEVEL
SHIFT
Q1602,1604,1606
L/R_IN
AO_L/R
MPDA_5
MPCLK_5
DAC1CS
OUTCON
REV
AUDIO
POWER AMP
IC3301
PAVCC(+12V)
GRADATION
POWER
IC1101
FLSP/FRSP
HL/R
R0~7 G0~7 B0~7
V0 V7 V21 V64
V112 V176 V235 V255
VCOM
CSCOM
SPEAKER
HEADPHONE
JACK
AUDIO OUT
LCD
PANEL
P3301
P3302
J5002
J3901
SC1202
SC1203
SC1204
+9V
+8V
+3.3V
+32V
–11V
Q3705
+23V
+17V
VOLTAGE
CONVERTER
IC702
-16V
TEXT R/G/B /FBL
CVBS
R/G/B
TELETEXT
CPU
IC1601
OFL REVERSE
Q3606
2
C
I
SRAM 2M
IC1612
L_ERR
OFL
DC/AC
INVERTER
DRIVE
Q6500
~6505
LAMP ERROR
DETECTOR
Q3601, 3602
DC/AC
TRANS
T6500
~6503
INVVCC(+12V)
HV1/2/3
BACK
LIGHT
LAMP
P3601
P6500
~P6501
REG IC2003
D
J3701
DC12V
REG IC2004
+5V
INPUT
REG IC707
PAVCC
REG IC705
C
+3.3V
+3.4V
+34V
Q3707
IC3702
Q3708
DC/DC
CONVERTER
SIGVCC
T3701
Q3709
FLASH 4M
B
REG IC706
PWM IC3701
A
INVVCC
B12V1A
Q3703
REG IC805
REG IC704
REG IC1602
+5V
+1.8V
+3.3V
+3.3V
REG IC703
REG IC1607
REG IC1605
-8V
+5V
+3.3V
+2.5V
IC1611
P4001
KEY
P4004
REMOTE
CONTROL
RECEIVER
24
121110987654321
25
LC-13B4E
LC-15B4E
ADJUSTING PROCEDURE OF EACH SECTION
The best adjustment is made before shipping. If any position deviation is found or after part replace is performed,
adjust as follows.
Preparation for adjustments
Use the dedicated AC adaptor or stable DC power supply.
AC adaptor: UADP-A034WJPZ
DC power supply: 12V 4.5A
1.Adjusting procedure
• Checker adjustment
Power ON (Adjustment processing mode) → +B adjustment → Counter bias adjustment → TAMP (Contrast)
adjustment → White balance adjustment
2.Entering the adjustment processing mode
There are the following two methods.
• Setting the pin (81)(KEY4) or pin (82)(KEY5) of IC2001 (microprocessor) to GND, turn on the power .
• A “POWER” key is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.(K of the inspection
process mode is displayed by the upper left of the image plane.) → Next, “CH (Ù)” and “VOL (–)” keys are pushed
at the same time.(It becomes the image plane of the adjustment process mode.).....When it is canceled, it is made
to turn it off.(Even off in the “MAIN POWER” key, off with R/C are good.)
3.Key operation in the adjustment process mode
• The receiving channel UP/DOWN is performed with the “CH (ù)/(Ù)” keys.
One push ... The UP/DOWN tuning is performed per channel.
Continuous push ... The UP/DOWN search is performed until a next receivable station is found.
• Various adjustments
The adjustment is performed for each item by the “MENU”, “Menu cursor”, “CH (ù)/(Ù)” or “VOL (+)/(–)” keys
(LCD TV set and remote control).
• Adjustment item is chosen with the Menu cursor upward/downward keys.
• The adjustment item makes a toggle operation with the “MENU” key input. (Next item)
If the “MENU” key is input while the bottom item is selected, it moves to the top item on the next page.
• Press the auto preset button on the remote controller in the adjustment process mode, and the top item of the
next page will show up regardless of which item appears now.
Page 1 → Page 2 → ... → Page 57 → Page 1
• Press the manual memory button on the remote controller in the adjustment process mode, and the top item of
the same page will show up.
• UP/DOWN of each adjustment vale selected is performed with the VOL (+)/(–) keys input.
13
LC-13B4E
LC-15B4E
4.Initialization
When the microprocessor (IC2001) or the EEPROM (IC2008, IC2010) has been replaced or when the EEPROM
has been initialized, readjust the each adjustments.
4-1. Connect the pins (81) and (82) of IC2001 (microprocessor) to GND, and turn on the power.
4-2. Select the model name to (A522).
4-3. Select the inch size (13)~1 or (15)~2.
4-4. LED changes green from red after setting finish and about 15 seconds, initialization is completed, and it
becomes adjustment mode.
4-5. Writing the model-by-model data
For the Ver.1.10A microprocessor, get it initialized first and then make the settings, listed below, on it. (The
microprocessor version is indicated at the bottom of Adjustment Process Page 1.)
ËLC-13B4E
Ver.1.10A data reprogramming (INCH SIZE [13])
Adjustment process page
2
2
4
4
4
4
4
4
4
4
4
4
13
13
13
13
13
R GAIN
B GAIN
TV GEQ BAND1
TV GEQ BAND2
TV GEQ BAND3
TV GEQ BAND4
TV GEQ BAND5
EXT GEQ BAND1
EXT GEQ BAND2
EXT GEQ BAND3
EXT GEQ BAND4
EXT GEQ BAND5
SECAM TV COLOR
SECAM A V COLOR
SECAM BRIGHTNESS
SECAM TV CONTRAST
SECAM A V CONTRAST
Item
OSD settings
0 → -26
0 → -6
+1.0 → +1.5
0.0 → -0.5
0.0 → +0.5
-1.5 → +0.5
-2.0 → +1.0
+1.0 → +1.5
0.0 → -0.5
0.0 → +0.5
-1.5 → +0.5
-2.0 → +1.0
37 → 41
37 → 41
-13 → -18
54 → 58
54 → 58
ËLC-15B4E
Ver.1.10A data reprogramming (INCH SIZE [15])
Adjustment process page
2
4
4
4
4
13
13
13
13
13
4-6. Precautions in replacing the EEPROMs (IC2008 and IC2010)
When the EEPROMs (IC2008 and IC2010) have been replaced, be sure to replace also the microprocessor
(IC2001) with the one "Part No. RH-iXA522WJN1Q".
The version of the RH-iXA522WJN1Q microprocessor is 1.20A.
Note:
~1:LC-13B4E
~2:LC-15B4E
B GAIN
TV GEQ BAND4
TV GEQ BAND5
EXT GEQ BAND4
EXT GEQ BAND5
SECAM TV COLOR
SECAM A V COLOR
SECAM BRIGHTNESS
SECAM TV CONTRAST
SECAM A V CONTRAST
Item
OSD settings
0 → +14
+0.5 → 0.0
+1.5 → +1.0
+0.5 → 0.0
+1.5 → +1.0
37 → 41
37 → 41
-13 → -18
54 → 58
54 → 58
14
5.Adjustment
5-1. +B adjustment...Page 1 +B-ADJ
Adjust the voltage of the pin (4) of P1902 to 5.00 ±0.02V with R3714.
Note: Since 5.0V is a reference voltage of all power voltage, adjust it precisely.
5-2. Counter-bias adjustment
Vary the "COM BIAS" setting on Page 2 of the adjustment process mode so that the contrast be sharpest
(black looks most sinking).
5-3. TAMP adjustment
1) Receive the upper left of 75% white half colour bar signal.
2) See if the “Y” reading on page 2 of the adjustment process mode is somewhere following. If not, make the
“PAL TAMP” adjustment to get the “Y” reading in the range of AE thru BD.
3) If the adjustment of “PAL TAMP” is executed, write its adjustment value to the “SECAM TAMP” manually.
(Screen of the page 2 of the adjustment processing menu OSD)
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
0
1
2
3
4
5
6
7
8
9
10
11
12
13
2
COM B I AS 9 0
PAL TAMP 21
SECAM TAMP 21
RCU TOF F
GCUT OF F
BCU TOF F
RGA I
GG
BGA I
TAMP
TAMP
AI
Y
N 0
N
N
H
L
B
B
A
LC-13B4E
LC-15B4E
0
0
0
0
0
6
D
E
Y Data
(White 75%)
5-4. White balance adjustment
Adjust “RCUTOFF” and “BCUTOFF” on the page 2 of the adjustment processing so as to obtain the colour
of the same level as the standard set.
15
LC-13B4E
LC-15B4E
6. Factory Setting
6-1. Perform a factory setting after completing all adjustments.
6-2. A “POWER” keys is made on with pushing an “TV/VIDEO” and “MENU” keys at the same time.
6-3. “K” of the inspection process mode is displayed on the screen upper left.
6-4. CH (ù) and VOL (+) keys are pushed about 2 seconds at the same time.
6-5. Release keys, if “E” is displayed on the screen upper left and “COMPLETE” is displayed on the bottom of it.
6-6. After a while, a power will be in a standby mode and a setup will be finished.
Note: “First installation” serves on “Deutsch”.
7. Lamp error detection
7-1. Functional description
This LCD colour television has a function (lamp error detection) to be turned OFF automatically for safety
when the lamp or lamp circuit is abnormal.
If the lamp or lamp circuit is abnormal, or some other errors happen, and the lamp error detection is executed,
the followings occur.
1 The main unit of television is turned OFF 5 seconds after it is turned ON. (The power LED on the front side
of TV turns from green to red.)
2 If the situation 1 happens 5 times sequentially , television can not be turned ON. (The power LED remains
red.)
7-2. Countermeasures
7-2-1.Check when turning OFF the lamp error detection
When television is turned OFF by the lamp error detection mentioned above, it enters the adjustment
process with the power LED red. Entering the adjustment process turns OFF the error detection and turns
ON TV .
This enables the operation check to detect errors in the lamp or lamp circuit.
Check whether "ERROR NO RESET" on line 3, page 1 of the adjustment process is 1 or more. If it is 1 or
more, it indicates the lamp error detection was executed.
7-2-2.Resetting of the lamp error count
After confirming that the lamp or lamp circuit is normal, reset the lamp error count. Select "ERROR NO
RESET" on line 3, page 1 of the adjustment process and set the number to 0 using the volume button.
Page 1 of the adjustment process
1
M O D E L A522
INCH SIZE ~3
ERROR NO RESET 5
PUBLIC MODE OFF
EXT CONTROL OFF
EXT MODE UART
UPDATE MODE NORMAL
TEXT RESET OFF
Reset 0
V E R R O M 1 . 1 0 A
Afterwards, perform the operation check to confirm that the lamp error detection does not function.
Note:~3 LC-13B4E=13, LC-15B4E=15
16
TROUBLE SHOOTING TABLE
No picture and No sound
Check all the settings microprocessor's adjust process menu.
Do F3301 and F3302
function?
Are T3701's secondary
outputs, +34V, +9V, +5V
and -11V normal?
Remove F3301 and F3302
and check the load side.
Is there short-circuiting?
Is there short-circuiting of
T3701 primary side periphery,
Q3703, Q3704 and S4701.
Replace F3301 and F3302.
Check S4701 and
connection cable.
Is T3701's primary oscillator
waveform normal?
Check T3701's secondary
load.
Yes Yes
No
No
No No
No
Yes
Check J3701 periphery and
connection cable.
Replace F6500~F6501.
Is the pin (120) of IC1201 in
the "H" state?
Is the output of Q3606 in the
"
L
"
state?
Yes
Yes
No
No
No
Yes
Yes
Check the OFL1 line, IC1201
and their peripheral parts.
Check the OFL line, Q3606
and their peripheral parts.
Check T6500~T6503,
Q6500~Q6505 and
connection cable.
Back light lamp failure to light up
Is the primary side of
T6500 ~T6503 periphery
short-circuiting?
Replace the back light lamp
with new one and check
again.
LC-13B4E
LC-15B4E
17
LC-13B4E
No picture (1/3)
Check all the settings microprocessor's adjust process menu.
Is in/output of
IC801 normal?
Is in/output of
IC1201 normal?
Check IC801
and its
peripheral parts.
Check IC1201
and its
peripheral parts.
Check LCD
panel voltages
and waveform.
Yes
Yes
No
No
No picture
at all
Is voltages at
pins (6), (7) and
(18) tuner
normal?
Is output at pin
(13) of tuner
normal?
Check the
power line.
Check tuner
and its
peripheral parts.
Is input at pin
(16) of IC806
normal?
Is the pin (3) of
IC806 at "H"
state?
Yes
Yes
No
No
No
No
No
Yes
No TV output
Is the pin (48)
of IC2001 at "H"
state?
Yes
Check the its
line.
Check the its
line.
Check IC806
and its
peripheral parts.
Is input at pin
(14) of IC806
normal?
Check V1_V
line and its
peripheral parts.
No
No VIDEO 2
output
LC-15B4E
TROUBLE SHOOTING TABLE (Continued)
18
TROUBLE SHOOTING TABLE (Continued)
No picture (2/3)
Check all the settings microprocessor's adjust process menu.
Is input at pin
(14) of IC806
normal?
Check the V2_V
line and its
peripheral parts.
No
No VIDEO 1
output
Check the SY-line,
SC-line and their
peripheral parts.
Is input at pin (9)
of IC806 and pin
(1) of IC803
normal?
No
No S-VIDEO
output
Check IC1201
and its
peripheral parts.
No
Yes
Yes
No TELETEXT
output
Is input at pins
(136), (137), (138),
and (142) of
IC1201 normal?
No
Check the R, G
and B line.
Is output at pins
(57)~(59) of IC1601
normal?
No
Yes
Check V2VO line
and its peripheral
parts.
Is input at pin (21) of
IC1601 normal?
Check IC1601 and its
peripheral parts.
LC-13B4E
LC-15B4E
19
LC-13B4E
No picture (3/3)
Check all the settings microprocessor's adjust process menu.
Is output of
R0~R7
normal?
Is output of
G0~G7
normal?
Is output of
B0~B7
normal?
Yes
Yes
No
No
No
Colour is
unusual
Is in/output of
SPIO and
SPOI normal?
No
No picture
image
inversion
No
Gradation
defect
Is output of U/D
normal?
Yes
No
Check R1227 and
its peripheral parts.
Check R1235 and
its peripheral parts.
Check IC1202,
Q1204 and their
peripheral parts.
Check R1228 and
its peripheral parts.
Check R1232 and
its peripheral parts.
Is output V0, V7, V21,
V64, V112, V176,
V235 and V255
normal?
Check IC1101 and its
peripheral parts.
LC-15B4E
TROUBLE SHOOTING TABLE (Continued)
20
TROUBLE SHOOTING TABLE (Continued)
No sound (1/2)
Check all the settings microprocessor's adjust process menu.
Is the pin (53) of
IC2001 in the
"L" state?
Is output at pins
(27) and (28) of
IC1901 normal?
Is output at pins
(1) and (7) of
IC1905 normal?
Yes
Yes
No
No
No
No sound
from front
speakers
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC1901
and its
peripheral parts.
Check IC1905
and its
peripheral parts.
Is the pin (52) of
IC2001 in the
"L" state?
Is output at pins
(24) and (25) of
IC1901 normal?
Is output at pins
(1) and (7) of
IC304 normal?
Yes
Yes
No
No
No
Yes
Muting effect is
on. Check the
HP_MUTE line.
Check IC1901
and its
peripheral parts.
Check IC304
and its
peripheral parts.
No sound
from
headphone
TV sound
failure
Is output at pins
(33) and (34) of
IC1901 normal?
Is output at pins
(1) and (7) of
IC3501 normal?
Check IC1901
and its
peripheral parts.
Check IC3501
and its
peripheral parts.
Yes
No
No
No
No sound
from output
line
Check the tuner
and its
peripheral parts.
Yes
No
Is output at pin
(11) of Tuner
normal?
Is input at pin
(67) of IC1901.
Check IC1901
and its
peripheral
parts.
Check
Headphone Jack
and connection
cable.
No
Is output at pins
(8) and (12) of
IC3301 normal?
Check IC3301
and its
peripheral parts.
Check front
speaker and
connection
cable.
Yes
LC-13B4E
LC-15B4E
21
LC-13B4E
No sound (2/2)
Check all the settings microprocessor's adjust process menu.
Yes
No
No
No sound from SCART
No
SCART sound failure
Yes
No
Check IC1901 and its
peripheral parts.
Is output at pins (36) and (37) of
IC1901 normal?
Check IC1902 and its
peripheral parts.
Is output at pins (1) and (7) of
IC1902 normal?
Check their lines and their
peripheral parts.
Is input at pins (53) and (54) of
IC1901 normal?
Check IC1901 and its
peripheral parts.
Is output at pins (27) and (28) of
IC1901 normal?
LC-15B4E
22
OVERALL WIRING DIAGRAM
H
G
F
LC-13B4E
LC-15B4E
E
D
C
B
A
121110987654321
26
27
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