Sharp LC-20SH1M Schematic
LC-20SH1M
LC-20SH1X
SERVICE MANUAL
S25E7LC20SH1M
LCD COLOUR TELEVISION
LC-20SH1M
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 P ARTS ..................................................................................................................8
» ADJUSTING PROCEDURE OF EACH SECTION .....................................................................................12
» TROUBLE SHOOTING TABLE ..................................................................................................................21
» BLOCK DIAGRAM......................................................................................................................................26
» OVERALL WIRING DIAGRAM ...................................................................................................................28
» DESCRIPTION OF SCHEMATIC DIAGRAM .............................................................................................30
» SCHEMATIC DIAGRAM .............................................................................................................................31
» PRINTED WIRING BOARD ASSEMBLIES................................................................................................46
» REPLACEMENT PARTS LIST....................................................................................................................61
» PACKING OF THE SET..............................................................................................................................73
LC-20SH1X
Page
SHARP CORPORATION
LC-20SH1M
1
1
1
LC-20SH1X
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 F6700 (1A, 250V), F6701 (1A, 250V),
F6702 (1A, 250V), F6703 (1A, 250V) F6704 (1A,
250V) AND F7701 (3.15A, 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.
• 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
23456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012
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"
23456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012
23456789012345678901234567890121234567890123456789012345678901212345678901234567890123456789012
2
Replacement Parts Lists and
LC-20SH1M
LC-20SH1X
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.
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
Precautions on removing the Sub PWB
• CAUTION
Before taking out and servicing the Sub unit, be sure to discharge the C7703 electrolytic capacitor. Otherwise
you may get an electric shock by the capacitor’s charging voltage.
3
LC-20SH1M
LC-20SH1X
SPECIFICATIONS
Items
LCD panel
Number of dots 921,600 dots
Video colour system World multi system
TV-Standard (CCIR) PAL: B/G, I, D/K NTSC: M SECAM: B/G, D/K
TV-Tuning System Auto preset tuning
TV STEREO/BILINGUAL NICAM-B/G, I, D/K, A2 stereo-B/G
AUTO PRESET Yes
CATV S1~S41 ch. Hyper Band
4 LINE DIGITAL COMB FILTER Yes
Brightness 430 cd/m
Viewing angles H: 170° V: 170°
Audio amplifier 2.1 W 2
Speakers 11 cm 4 cm 2 pcs.
INPUT1 Y, PB(CB), PR(CR)/ Audio (L/R)
Terminals
OSD language English/Chinese/Arabic
Power requirement AC 110 V–240 V, 50/60 Hz
Power consumption 64 W (1.0 W Standby), AC 110 V–240 V
Weight (approx.) 6.4 kg, w/o accessories
ËAs a part of policy of continuous improvement, SHARP reserves the right to make design and specification changes for the LCD TV set
improvement
some deviations
INPUT2 Composite Video, S-Video, Audio (L/R)
AUDIO OUT Audio (L/R)
Headphones 3.5 mm ø jack (side)
without prior notice. The performance specification figures indicated are nominal values of production units. There
from these values in individual units.
Model
20" (50 cm) Advanced Super View & BLACK TFT LCD
2
×
×
LC-20SH1M/LC-20SH1X
may be
4
OPERATION MANUAL
Part Names of the Main Unit
Controls
NOTE
• TV/VIDEO, CH (
)/(
) (Channel), VOL (–)/(+) (Volume) and MENU on the upper control panel of the main unit have the same
functions as the same buttons on the remote control Fundamentally, this operation manual provides a description based
on operation
using the remote control.
OPC sensor
Remote sensor
OPC (Optical Picture Control) indicator
The OPC indicator lights up green when the "BACKLIGHT" is
set to "AUTO (OPC)".
POWER indicator
POWER
indicator lights up green when the power is on, and red when in the
standby mode (the indicator will not light when the main power is off).
The screen angle can be tilted backwards
between 12 and 30 degrees. (It cannot be
set to vertical.) When changing the angle,
make sure to hold the stand and adjust the
screen to the best viewable angle.
(MAIN POWER)
Upper control panel
TV//VIDEO
MENU
CH (
)/( ) (Channel)
VOL (–)/(+) (Volume)
12
°
30°
How to adjust the angle
Adjustable range
Speaker
The examples used throughout this manual are based on the LC-20SH1M model.
Terminals
Stand
AC INPUT
terminal
Round lock for Kensington
Security Standard slot
Rear View
AUDIO
AUDIO OUT
INPUT1
INPUT2
L
R
L
R
S-VIDEO
VIDEO
COMPONENT
P
R
(C
R
)
P
B
(C
B
)
Y
AUDIO
L
R
AUDIO
Antenna terminal
Headphone jack
How to Fix the Cables
Pull
the cables connected to each terminal.
Insert the cables into the stand hole and fix the cables.
Stand hole
How to Prevent the LCD TV Set from Falling Over
To prevent the LCD TV set from falling over in case
of earthquakes and so on, strap it onto the wall by
threading one end of the string through the loop of
the stand (
1
) and fastening the LCD TV set with
the string attached to the hook on the wall or the
post, etc. (
2
).
(An example of strapping the LCD TV set onto the
wall is shown on the right.)
• The string and hook are commercially available.
Stand
2
1
LC-20SH1M
LC-20SH1X
5
LC-20SH1M
Part Names of the Remote Control
MPX
Switches to the sound mode.
BACKLIGHT
Selects the brightness and
OPC of the display.
Upwards/Downwards
Selection, Zoom display
function (Teletext mode)
(Mute)
Switches the sound on and off.
POWER
MENU
Displays the menu.
(Flashback)
Returns to the previous channel.
Channel Select
TV mode: Selects the channel.
Teletext mode: 0-9/Selects the page.
Cyan, Status Display
Turns on the status display
when the menu screen is not displayed.
Yellow, SLEEP TIMER Menu
VOL (+)/(
-
)
(
Volume
)
TV/VIDEO ( )/( )
Switches the input source
between INPUT1, INPUT2
and TV mode.
OK
RETURN
Returns to the previous screen.
Right/Left Selection
TEXT
Displays the Teletext mode
screen.
REVEAL
Displays hidden information
such as solutions to riddles
and puzzles.
HOLD
Temporarily holds the
current Teletext page.
SUBTITLE
Displays the Teletext
Subtitle directly.
SUBPAGE
Displays the Teletext
Subpage directly.
Red, PICTURE Menu
Green, SOUND Menu
CH ( )/( ) (Channel)
TV mode: Selects the channel.
Teletext mode: Selects the page.
Installing Batteries in the Remote Control
Before using the LCD TV set for the first time, install the two "AA" size batteries (supplied) in the remote control. When the
batteries become depleted and the remote control fails to operate, replace the batteries with new "AA" size batteries.
1
Open the battery cover.
2
Insert two "AA" size batteries.
3
Close the battery cover.
• Place batteries with their
terminals corresponding
to the (+) and (–)
indications in the battery
compartment.
Caution!
Precautions regarding batteries
Improper use of batteries can result in a leakage of chemicals and/or explosion. Be sure to follow the instructions below.
• Place batteries with their terminals corresponding to the (+) and (–) indications.
• Different types of batteries have different characteristics. Do not mix batteries of different types.
• Do not mix old and new batteries. Mixing old and new batteries can shorten the life of new batteries and/or cause old
batteries
to leak chemicals.
• Remove batteries as soon as they are depleted. Chemicals that leak from batteries can cause a rash. If chemical
leakage is found, wipe it off with a cloth.
• The batteries supplied with the LCD TV set may have a shorter operating time due to storage conditions.
• If the
remote control is not to be used for an extended period of time, remove the batteries from the remote control.
• Align the tab on the battery cover (
1
1
) and place
it while pressing the tab (
2
2
) to close it.
Using the Remote Control
Use the remote control by pointing it towards the remote sensor
window of the main unit. Objects between the remote control and
sensor window may prevent proper operation.
Cautions regarding use of the remote control
• Do not apply shock to the remote control. In addition, do not
expose the remote control to liquids, and do not place it in an area
with high humidity.
• Do not install or place the remote control under direct sunlight. The
heat may
cause deformation of the unit.
• The remote control may not work properly if the remote sensor
window is under direct sunlight or strong lighting. In such a case,
change the angle of the lighting or main unit, or operate the remote
control closer to the remote sensor window.
• Detach the cover
while pressing the
(
"
) part.
POWER indicator
OPC indicator
Remote sensor
OPC sensor
POWER
Preparation
LC-20SH1X
6
DIMENSIONS
LC-20SH1M
LC-20SH1X
418
12°
161
175
30°
Unit: mm
215
246
403.3
375
85
121
342
346
480
100
3
205
300.8
427
242
10
47
100
178
7
LC-20SH1M
LC-20SH1X
REMOVING OF MAJOR PARTS
1. Remove the stand fixing screws (4 pcs.).
2. Remove the cabinet B fixing screws (7 pcs.).
3. Remove the cabinet B after opening from the direction of an arrow.
4. Detach the connector from each PWB.
2
Cabinet A
1
2
3
Cabinet B
Stand
Main PWB
CN2
4
SC4201
CN3
Operation PWB
4
SC105
SC1202
SC1201
SC1203
4
SC102
P7301
P3601
4
4
CN1
SC104
P3901
P3301
4
SC3601
SC106
P3902
Sub PWB
SC4001
R/C,LED PWB
P6705
SC6701
P6703
4
P6702
P6701
4
P6700
Inverter PWB
8
LC-20SH1M
LC-20SH1X
5. Remove the 2 lock screws from the main PWB and undo the hooks a. Detach the chassis frame, together with its
terminals, from the main PWB.
6. Remove the 2 lock screws from the sub PWB and undo the hooks b, c and d. Detach the chassis frame together
with its terminals, from the sub PWB.
7. Remove the 3 lock screws from the inverter PWB and take out the inverter PWB.
8. Remove the 2 lock screws from the R/C, LED PWB and take out the R/C, LED PWB.
9. Remove the 2 lock screws from the operation panel (top cover), and detach the operation panel (top cover).
10. Remove the 3 lock screws from the operation PWB, and detach the operation PWB.
11. Remove the 4 lock screws each from the right and left speakers and take out both the speakers.
6
5
Main PWB
Chassis Frame
a
Speaker (R)
d
Operation panel
(Top Cover)
c
b
10
Sub PWB
9
Operation
PWB
Inverter PWB
Speaker (L)
7
11
R/C,LED PWB
9
11
8
LC-20SH1M
LC-20SH1X
» Precautions in handling the LCD panels
1. Work in a clean room (with humidities below 50%).
2. Be sure to wear an anti-static armband.
3. Handle the panels on an electro-conductive mat.
4. Be careful not to fall, shake and shock the panels.
12. Remove the 3 lock screws from the LCD panel and detach the LCD panel.
13. Remove the reflection/deflection sheet, diffusion sheet and diffusion plate.
14. Detach the lamp holders -R (top), -L (top) and -R (bottom), -L (bottom) from the lamp unit.
15. Detach the reflection sheet from the back shield.
Back shield
(PSLDMA495WJFW)
Lamp Holder -L (Bottom)
(LHLDZA412WJKZ)
12
20" LCD Panel Unit
Lamp Holder -L (Top)
(LHLDZA414WJKZ)
13
(PSHEPA233WJZZ)
Reflection/deflection Sheet
(PSHEPA231WJZZ)
14
Lamp Holder -R (Top)
(LHLDZA415WJKZ)
Diffusion Plate
(PCOVUA048WJZZ)
Diffusion Sheet
15
Reflection Sheet
(PSHEPA226WJZZ)
Lamp Holder -R (Bottom)
(LHLDZA413WJKZ)
Lamp Unit, x5
(KLMP-A046WJZZ)
10
LC-20SH1M
SC1203
SC1202
SC1201
SC105
SC102
P7301
P3902
SC106
SC104
P3901
SC3601
CN1
CN2
CN3
SC4201
P3601
SC6701
SC4001
2
3
1
7
4
6
8
9
5
10
Main PWB
Operation PWB
Inverter PWB
Inverter
PWB
(Side B)
Main PWB
(Side B)
Sub PWB
(Side B)
Sub PWB
R/C, LED PWB
LC-20SH1X
» Precautions at the time of the side B(back) service of main, sub and Inverter unit.
1. Remove the FFC for connection between Main unit (SC1203) and LCD panel (CN1), and connect the extended
cable (QCNW-B784WJZZ) for service.
2. Remove the FFC for connection between Main unit (SC1202) and LCD panel (CN2), and connect the extended
cable (QCNW-A556WJZZ) for service.
3. Remove the FFC for connection between Main unit (SC1201) and LCD panel (CN3), and connect the extended
cable (QCNW-A555WJZZ) for service.
4. Remove only SC102 side of the lead from between Main unit (SC102) and Sub unit (P7301), and connect the
extended cable (QCNW-C461WJQZ) for service.
5. Remove only SC104 side of the lead from between Main unit (SC104) and Sub unit (P3901), and connect the
extended cable (QCNW-C461WJQZ) for service.
6. Remove only SC106 side of the lead from between Main unit (SC106) and Sub unit (P3902), and connect the
extended cable (QCNW-D402WJQZ) for service.
7. Remove the FFC for connection between Main unit (SC105) and Operation unit (SC4201), and connect the
extended cable (QCNW-D444WJQZ) for service.
8. Remove the FFC for connection between Sub unit (SC3601) and R/C, LED unit (SC4001), and connect the
extended cable (QCNW-D445WJQZ) for service.
9. Remove only SC6701 side of the lead from between Inverter unit (SC6701) and Sub unit (P3601), and connect
the extended cable (QCNW-D449WJQZ) for service.
10. Remove the PWB unit fixing screws (main unit : 2pcs, sub unit : 2pcs., inverter unit : 3pcs.)
Step Part No. Description
1 QCNW-B784WJZZ Extension Cable 30-pin Main (SC1203)-LCD Panel (CN1)
2 QCNW-A556WJZZ Extension Cable 50-pin Main (SC1202)-LCD panel (CN2)
3 QCNW-A555WJZZ Extension Cable 20-pin Main (SC1201)-LCD panel (CN3)
4 QCNW-C461WJQZ Extension Cable 15-pin Main (SC102)-Sub (P7301)
5 QCNW-C461WJQZ Extension Cable 15-pin Main (SC104)-Sub (P3901)
6 QCNW-D402WJQZ Extension Cable 23-pin Main (SC106)-Sub (P3902)
7 QCNW-D444WJQZ Extension Cable 5-pin Operation (SC4201)-Main (SC105)
8 QCNW-D445WJQZ Extension Cable 8-pin R/C, LED (SC4001)-Sub (SC3601)
9 QCNW-D449WJQZ Extension Cable 13-pin Inverter (SC6701)-Sub (P3601)
11
LC-20SH1M
LC-20SH1X
ADJUSTING PROCEDURE OF EACH SECTION
The best adjustment is made before shipping. If any position deviation is found or after part replacement is
performed, adjust as follows.
Preparation for adjustments
Use a stable AC power source.
LC-20SH1M/X AC Power : 230V
1.Adjusting procedure
Complete Set → Power ON → Enter Adjustment Process Mode (By Remote Control) → RF AGC adjustment →
DCXO adjustment → Common Bias adjustment → White Balance adjustment
2.Entering the adjustment process mode
• After power on, press the adjustment process mode key on the service remote control.
• Switching on the TV set, holding pushed the "TV/VIDEO" and "VOL (–)" Key at once, the TV set enters in the
"K" mode.
In this condition, pushing "VOL (–)" and "CH (Ù)" Key, the adjust mode appears.
3.Key operation in the adjustment process mode
• Use the "UP" or "DOWN" cursor key to select the adjustment mode item.
• Use the "LEFT" or "RIGHT" cursor key to change the data.
4.Initialization
When the EEPROM (IC101) has been replaced or when the EEPROM has been initialized, readjust the each
adjust the each adjustments.
4-1. When the EEPROM has been replaced:
1) Plug in the AC cord to an AC power outlet and turn on the power.
2) When the setting is finished, the LED turns from red to green. In about 15 seconds, the initialization is
completed.
4-2. When initializing the EEPROM data and making readjustments:
1) Enter the Adjustment Process mode.
2) Select the INIT TV item and press the "RIGHT" cursor key to enable the item.
3) Unplug the power cable and plug it again in the AC power outlet. Turn on the power.
4) When the setting is finished, the LED turns from red to green. In about 5 seconds, the initialization is
completed.
<Note>
When the INIT TV item has been enabled in the adjustment process, be sure to unplug the power cable and plug
it in again. Then start adjustments. Otherwise the readjusted data cannot be put in memory.
4-3. Setting the screen size (inches)
1) Enter the Adjustment Process mode.
2) Check the model number.
3) Hold down the "LEFT" or "RIGHT" cursor key longer than 2 seconds, and select a screen size (LC-20SH1M).
SH1M Main Ver
INCH SIZE 20
Scaler Ver *.**.**
*.**
12
5.Adjustment
5-1. RF AGC adjustment
1) Feed the colour bar signal. (intensity:52 dBµ)
2) In Adjustment Mode, select the RF AGC AUTO ("OFF") and press the " RIGHT" cursor key to start the
adjustment.
3) Automatic adjustment is complete when it display "OK" is displayed.
4) RF AGC data will be in the range of 0-63. If "NOK" is displayed, adjustment failed.
LC-20SH1M
LC-20SH1X
SH1M Main Ver
Scaler Ver *.**.**
RF AGC AUTO OK
*.**
RF AGC Auto adjustment complete
RF AGC data (Example)
38
5-2. DCXO adjustment
1) Feed the NICAM bar signal. (intensity:above 60 dBµ)
2) In Adjustment Mode, select the DCXO AUTO ("OFF") and press " RIGHT" cursor key to start the adjustment.
3) Automatic adjustment is complete when "OK" is displayed. If "NOK" is displayed, adjustment failed.
SH1M Main Ver
DCXO AUTO OK
Scaler Ver *.**.**
*.**
DCXO Auto adjustment complete
DCXO data
**
5-3. Common bias adjustment
1) Select the INPUT 2 input and without signal.
2) In Adjustment Mode, select the COM BIAS and vary the data until the contrast becomes the sharpest.
(Black looks most sinking.)
5-4. White balance adjustment
[A] White balance pre-adjustment
1) Feed the 100% white signal.
2) In Adjustment Mode, select the AWBSD ("OFF") and press the " RIGHT" cursor key to start the adjustment.
3) Automatic adjustment is complete when "OK" is displayed.
[B] White balance adjustment
Adjust "R CUTOFF2", "G CUTOFF2", "B CUTOFF2", "WB R GAIN", "WB G GAIN" and "WB B GAIN" in the
adjustment processing to obtain the same colour as the standard set.
6.Factory setting
6-1. Make the factory setting using the adjustment remote control.
Model Key Name Remote Control Code OSD Language Setting
A3LC20SH1M Shipment Setting 2 1000 0000 1010 110 English
A3LC20SH1A Shipment Setting 3 1000 0110 1011 110 Chinese
A3LC20SH1X Shipment Setting 4 1000 0100 1011 110 French
6-2. Different factory settings.
Model Language Sound System
A3LC20SH1M English B/G
A3LC20SH1A Chinese D/K
A3LC20SH1X English B/G
13
LC-20SH1M
LC-20SH1X
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
If the power has been turned off 5 times because of lamp error , hold down the unit’s "INPUT" and "Volume
(–)" key simultaneously and turn on the unit’s power switch. The TV set gets back on power in the "K"
mode.
In this state, press the unit’s "VOL (–)" and "CH (Ù)" key simultaneously. The Adjustment Process mode
shows up.
This enables the operation check to detect errors in the lamp or lamp circuit.
Check whether "ERROR NO RESET" 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" of the adjustment process and set the number to 0 using the "LEFT" or "RIGHT" cursor key.
SH1M Main Ver *.**
ERROR NO RESET 5
Afterwards, perform the operation check to confirm that the lamp error detection does not function.
Scaler Ver *.**.**
Reset 0
14
8. Hotel mode
8-1. How to enter the Hotel mode.
1) Turn on the power and enter the Adjustment Process mode.
2) Using the "UP" or "DOWN" cursor key on the remote controller, select the Hotel mode.
3) Using the "RIGHT" cursor key on the remote controller, change the setting from "0" to "1". Now the
Hotel mode shows up.
Adjustment Process menu
LC-20SH1M
LC-20SH1X
Hotel mode = "0"
Hotel mode 0
EXT CONTROL OFF
Hotel mode = "1"
Hotel mode 1
Max. volume **
On program ***
EXT CONTROL OFF
4) Using the "UP" or "DOWN" cursor key on the remote controller, select "Max. volume" and "On program".
Make the setting with the "LEFT" or "RIGHT" cursor key.
5) Finally quit the Adjustment Process mode and turn off the power. The TV set comes on in the Hotel mode
after the next switch-on.
8-2. Hotel mode settings
1) Max. volume (0-60)
You can set the maximum volume at your desired level.
2) On program (0-199)
You can select a desired channel when switching on the TV set.
8-3. Canceling the Hotel mode
1) Turn on the power and enter the Adjustment Process mode.
2) Using the "UP" or "DOWN" cursor key, select the Hotel mode.
3) Using the "LEFT" cursor key, change the setting from "1" to "0".
4) Finally quit the Adjustment Process mode and turn off the power. The TV set comes on out of the Hotel
mode after the next switch-on.
15
LC-20SH1M
LC-20SH1X
9. Software Loading
1) Upgrading the software or after replacement of IC151, IC501 or Main PWB, make sure to upload the processors
with updated software.
2) Please use the dedicated Interface JIG (JIGINF-001) and supplied programs for upgrading the software.
3) This model employs two software;
• SCALER microprocessor software
• MAIN microprocessor software
Please upload the SCALER microprocessor software first follow by MAIN microprocessor software.
1. SCALER microprocessor
1) Set Interface JIG switch to position "SCALER".
2) Power ON the set and plug Interface JIG connector to P2002.
3) Run the ISP_Tool.exe program.
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LC-20SH1M
LC-20SH1X
4) First click [SST / ATMEL] and then follow by [Identify] to identify the flash memory.
Confirm the item below in Comment Window.
5) Click [Select Intel HEX File …] to open the source files. The source file name are "Sedna_Sharp****.hex"
Confirm the source file is loaded correctly.
6) Next click the [Erase] to erase all the data in the flash memory. Confirm the erase process is complete
without any error.
7) Then click [Program] to start uploading the source file into the flash memory. After uploading process is
complete, confirm there are no error.
8) Click [Verify] to verify the uploaded data and confirm there are no error.
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LC-20SH1M
LC-20SH1X
9) Finally click [Restart System] to initialize. Confirm "Reset done" in Comment Window.
10) Power OFF the set by unplugging AC Cord, remove the JIG from the plug and wait for 1 minute before
power ON again.
Notes: If any error occur during any process, power OFF the set and repeat the all the process again. If
these still fail, please erase Main Software and repeat the whole process again. To erase Main software,
please refer to MAIN microprocessor step No. 1) to 5) only.
2. MAIN microprocessor
1) Set JIG switch to position "LOC".
2) Power ON the set and plug Interface JIG connector to P2002.
3) Run the WISP.exe program.
18
4) First click [Enter ISP Mode] then click [Send]. If the following window appear, click [Yes]
Confirm ISP status "Ready".
If "Entering ISP is not successful" occur, repeat step No. 4) again. If still fail, unplug the AC cord and
repeat from step No. 2) again.
LC-20SH1M
LC-20SH1X
5) Then click [Erase Flash], follow by [Send]. Confirm the Program, PK26 & Character are all "OK" and ISP
status is "Ready".
If "Failed" occur, unplug the AC cord and repeat the whole process again from beginning.
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6) Next click [Write Flash] and load the source file by clicking [Browse]. The source file name are
"LC20SH1_****.hex". Once the data is loaded successfully click [Send]. Confirm the Program, PK26 &
Character are all "OK" and ISP status is "Ready".
If "Failed" occur, unplug the AC cord and repeat the whole process again from beginning.
7) Finally click [Verify Flash] and [Send] to verify the flash memory. Confirm the Program, PK26 & Character
are all "OK" and ISP status is "Ready". If "Failed" occur, unplug the AC cord and repeat the whole process
again from beginning.
8) Power OFF the set and remove the JIG.
20
No No
No Yes
Yes
Yes
Yes
Yes No
No
No
No
Yes
No
Yes
Yes
No
No
Yes
No
Yes
No
Yes
No picture and No sound
Back light lamp failure to light up
Replace F7701.
Is Q7751 base
voltage at "L"
state?
Check all output
voltage line for
short circuit.
Is T7001 primary
switching
waveform at pin
(2) of Q7308
normal?
Check the Q7308,
IC7301 and its
peripheral parts.
Are T7001
secondary output
at C7006, C7008,
C7010 and C7012
voltage normal?
Do fuse F7701
function?
Are T7701
secondary output at
C7734 and C7735
voltage normal?
Check Q6700-
Q6716 and its
peripheral parts for
short circuiting.
Is there any short
circuit in INV+B
line?
Check the OFL1
line, OFL2 line,
IC1201 and their
peripheral parts.
Check the OFL
line, Q3601,
Q3602 and their
peripheral parts.
Check Q6700-
Q6716 and its
peripheral parts.
Replace the back
light lamp with
new one and
check again.
Do fuse F6700-
F6704 function?
Are the pins (40)
and (138) of
IC1201 in the "H"
state?
Are the outputs of
Q3601 and Q3602
in the "L" state?
Is the pins (2) and
(4) of T6700-
T6704 normal?
Is the pin (6) of
T6700-T6704
normal?
Check the error
amp circuit
D6702-D6711,
Q6706, Q6713,
Q6717 and their
peripheral parts.
Remove F7701
and check the load
side. Is there short-
circuit?
Is the there short-
circuit in T7701
primary side
periphery?
Check the IC7702
and IC7704 and its
peripheral parts.
Check the IC7701
and its peripheral
parts.
Is T7701 primary
switching waveform
at pin (1) of IC7701
normal?
TROUBLE SHOOTING TABLE
LC-20SH1M
LC-20SH1X
21
LC-20SH1M
No
No
No
No
Yes
Yes
No
No
Yes
Yes
No
Yes
No
No S-Video
output
No Picture (1/3)
Check all the settings microprocessor's adjust process menu
No picture at all.
No INPUT2
output
No TV output
Is input/output of
IC850 normal?
Is input/output
of IC1201
normal?
Check LCD
panel voltages
and waveform.
Check IC501
and its
peripheral parts.
Check IC1201
and its
peripheral parts.
Is voltage at pins
(5) and (6) of
tuner normal?
Is output at pin
(8) of tuner
normal?
Is input/ouput of
SF201 normal?
Is the output of
IC801 is normal?
Check the
IC801 and its
peripheral parts.
Check the
SF201 and its
peripheral parts.
Check tuner and
its peripheral
parts.
Check the power
line.
Is video input at
pin (B21) of
IC501 normal?
Check V1_V line
and its
peripheral parts.
Is input at pins
(C18) and (D18)
of IC501
normal?
Check V1_SY
and V1_SC line
and its
peripheral parts.
LC-20SH1X
TROUBLE SHOOTING TABLE (Continued)
22
No
Yes
No Picture (2/3)
Check all the settings microprocessor's adjust process menu
No INPUT1 Output (COMPONENT)
Check IC501 and
its peripheral parts.
Is input at pins (3),
(6 ) and (10) of
IC850 normal?
Check Y, Pr, Pb
lines and its
peripheral parts.
No TELETEXT
output
Check IC501 and
its peripheral parts.
No
No No
Yes
Yes
No
No
Yes
No
Is output of U/D normal?
No Picture (3/3)
Check all the settings microprocessor's adjust process menu
Colour is unusual
Gradation defect
Is output R0-R7 at
SC1202 normal
Is output G0-G7 at
SC1202 normal
Is output B0-B7 at
SC1202 normal
Check R1205 and its
peripheral parts.
Check R1206 and its
peripheral parts.
Check R1207 and its
peripheral parts.
No picture image
inversion
Is input/output of
SPIO and SPOI
normal?
Check R1216 its
peripheral parts.
Check R1210 and its
peripheral parts.
Is output V0, V7, V21,
V64, V112, V176, V235
and V255 normal?
Check IC1101 and its
peripheral parts.
TROUBLE SHOOTING TABLE (Continued)
LC-20SH1M
LC-20SH1X
23
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