Funai LCD-A1504 Schematic
SERVICE MANUAL
15" COLOR LCD TELEVISION
LCD-A1504
20" COLOR LCD TELEVISION
LCD-A2004
15″/20″ COLOR LCD TELEVISION
LCD-A1504
LCD-A2004
TABLE OF CONTENTS
Specifications ........................................................ 1-1
Important Safety Precautions................................ 2-1
Standard Notes for Servicing ................................ 3-1
Cabinet Disassembly Instructions ......................... 4-1
How to Initialize the LCD Television...................... 5-1
Electrical Adjustment Instructions ......................... 6-1
Block Diagrams ..................................................... 7-1
Schematic Diagrams / CBA’s and Test Points ...... 8-1
The LCD panel is manufactured to provide many years of useful life.
Occasionally a few non active pixels may appear as a tiny spec of color.
This is not to be considered a defect in the LCD screen.
Schematic Diagrams.............................................. 8-3
CBA Views and Test Points ................................. 8-12
Waveforms............................................................. 9-1
Wiring Diagram .................................................... 10-1
Cabinet Exploded View........................................ 11-1
Packing Exploded View ....................................... 11-3
Mechanical Parts List........................................... 12-1
Electrical Parts List .............................................. 13-1
SPECIFICATIONS
<TUNER> ANT. Input ------------------- 80 dBµV, Video: PAL 87.5%, Audio: 30 kHz dev (1 kHz Sin)
Test Input Signal----------- 400Hz 30% modulation
Description Condition Unit Nominal Limit
1. Intermediate Freq. Picture
2. Color Killer Sens. CH-3 dBµV 20 23
3. AFT Pull In Range
(10mV input)
Sound
– MHz ±1.6 ±0.7
<LCD PANEL>
Description Condition Unit Nominal Limit
1. Number of Pixels Horizontal
Verti c al
2. Brightness
3. Response Time - msec 16 -
4. Support Color - - 16mil.(8bit) -
5. Viewing Angle Horizontal
Verti c al
MHz
MHz
pixels
pixels
cd/m
°
°
45.75
41.25
640 x 3
480
2
450 -
-85 to 85
-85 to 70
-
-
-
-
-
<VIDEO>
Description Condition Unit Nominal Limit
1. Over Scan Horizontal
2. Color Temperature -
3. Resolution Horizontal
<AUDIO>
Description Condition Unit Nominal Limit
1. Audio Output Power 10% THD: Lch/Rch W 1.0/1.0 0.8/0.8
2. Audio Distortion 500mW: Lch/Rch % 1.0/1.0 <3
3. Audio Freq. Response
4. Audio S/N RF
Note:
Nominal specifications represent the design specifications. All units should be able to approximate these. Some
will exceed and some may drop slightly below these specifications. Limit specifications represent the absolute
worst condition that still might be considered acceptable. In no case should a unit fail to meet limit specifications.
All items are measured across 8Ω load at speaker output terminal with L.P.F.
Vert i c al
Vert i c al
-
6dB: Lch
-
6dB: Rch
VIDEO 1
VIDEO 2
x
y
%
%
°K 8500
line
line
Hz
Hz
dB
dB
dB
8.5
6.5
0.29
0.30
400
350
50 to 12K
50 to 12K
60
60
60
10±5
10±5
-
0.29±0.03
0.30±0.03
<250
<300
-
-
45
45
45
1-1 L4100SP
IMPORTANT SAFETY PRECAUTIONS
Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical
codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally
important to implement the following precautions when a set is being serviced.
Safety Precautions for LCD TV
Circuit
1. Before returning an instrument to the
customer, always make a safety check of the
entire instrument, including, but not limited to, the
following items:
a. Be sure that no built-in protective devices are
defective and have been defeated during
servicing. (1) Protective shields are provided
on this chassis to protect both the technician
and the customer. Correctly replace all missing
protective shields, including any removed for
servicing convenience. (2) When reinstalling
the chassis and/or other assembly in the
cabinet, be sure to put back in place all
protective devices, including but not limited to,
nonmetallic control knobs, insulating
fishpapers, adjustment and compartment
covers/shields, and isolation resistor/capacitor
networks. Do not operate this instrument or
permit it to be operated without all
protective devices correctly installed and
functioning. Servicers who defeat safety
features or fail to perform safety checks
may be liable for any resulting damage.
b. Be sure that there are no cabinet openings
through which an adult or child might be able to
insert their fingers and contact a hazardous
voltage. Such openings include, but are not
limited to, (1) spacing between the LCD module
and the cabinet mask, (2) excessively wide
cabinet ventilation slots, and (3) an improperly
fitted and/or incorrectly secured cabinet back
cover.
c. Antenna Cold Check - With the instrument AC
plug removed from any AC source, connect an
electrical jumper across the two AC plug
prongs. Place the instrument AC switch in the
on position. Connect one lead of an ohmmeter
to the AC plug prongs tied together and touch
the other ohmmeter lead in turn to each tuner
antenna input exposed terminal screw and, if
applicable, to the coaxial connector. If the
measured resistance is less than 1.0 megohm
or greater than 5.2 megohm, an abnormality
exists that must be corrected before the
instrument is returned to the customer. Repeat
this test with the instrument AC switch in the off
position.
d. Leakage Current Hot Check - With the
instrument completely reassembled, plug the
AC line cord directly into a 230 V AC outlet. (Do
not use an isolation transformer during this
test.) Use a leakage current tester or a
metering system that complies with American
National Standards Institute (ANSI) C101.1
Leakage Current for Appliances and
Underwriters Laboratories (UL) 1410, (50.7).
With the instrument AC switch first in the on
position and then in the off position, measure
from a known earth ground (metal water pipe,
conduit, etc.) to all exposed metal parts of the
instrument (antennas, handle brackets, metal
cabinet, screw heads, metallic overlays, control
shafts, etc.), especially any exposed metal
parts that offer an electrical return path to the
chassis. Any current measured must not
exceed 0.5 milli-ampere. Reverse the
instrument power cord plug in the outlet and
repeat the test.
READING SHOULD
NOT BE ABOVE 0.5 mA
LEAKAGE
DEVICE
BEING
TESTED
TEST ALL EXPOSED
METAL SURFACES
ALSO TEST WITH
PLUG REVERSED
USING AC
ADAPTER PLUG
AS REQUIRED
ANY MEASUREMENTS NOT WITHIN THE
LIMITS SPECIFIED HEREIN INDICATE A
POTENTIAL SHOCK HAZARD THAT MUST
BE ELIMINATED BEFORE RETURNING THE
INSTRUMENT TO THE CUSTOMER OR
BEFORE CONNECTING THE ANTENNA OR
ACCESSORIES.
2. Read and comply with all caution and safety-
related notes on or inside the receiver cabinet, on
the receiver chassis, or on the LCD module.
3. Design Alteration Warning - Do not alter or add
to the mechanical or electrical design of this LCD
TV receiver. Design alterations and additions,
including, but not limited to circuit modifications
and the addition of items such as auxiliary audio
and/or video output connections, might alter the
safety characteristics of this receiver and create a
hazard to the user. Any design alterations or
additions will void the manufacturer's warranty and
may make you, the servicer, responsible for
personal injury or property damage resulting
therefrom.
CURRENT
TESTER
+
EARTH
GROUND
_
2-1 LTVP_ISP
4. Hot Chassis Warning -
a. Some TV receiver chassis are electrically
connected directly to one conductor of the AC
power cord and maybe safety-serviced without
an isolation transformer only if the AC power
plug is inserted so that the chassis is
connected to the ground side of the AC power
source. To confirm that the AC power plug is
inserted correctly, with an AC voltmeter,
measure between the chassis and a known
earth ground. If a voltage reading in excess of
1.0V is obtained, remove and reinsert the AC
power plug in the opposite polarity and again
measure the voltage potential between the
chassis and a known earth ground.
b. Some TV receiver chassis normally have 85V
AC(RMS) between chassis and earth ground
regardless of the AC plug polarity. This chassis
can be safety-serviced only with an isolation
transformer inserted in the power line between
the receiver and the AC power source, for both
personnel and test equipment protection.
c. Some TV receiver chassis have a secondary
ground system in addition to the main chassis
ground. This secondary ground system is not
isolated from the AC power line. The two
ground systems are electrically separated by
insulation material that must not be defeated or
altered.
5. Observe original lead dress. Take extra care to
assure correct lead dress in the following areas: a.
near sharp edges, b. near thermally hot parts-be
sure that leads and components do not touch
thermally hot parts, c. the AC supply, d. high
voltage, and, e. antenna wiring. Always inspect in
all areas for pinched, out of place, or frayed wiring.
Check AC power cord for damage.
6. Components, parts, and/or wiring that appear to
have overheated or are otherwise damaged
should be replaced with components, parts, or
wiring that meet original specifications.
Additionally, determine the cause of overheating
and/or damage and, if necessary, take corrective
action to remove any potential safety hazard.
7. Product Safety Notice - Some electrical and
mechanical parts have special safety-related
characteristics which are often not evident from
visual inspection, nor can the protection they give
necessarily be obtained by replacing them with
components rated for higher voltage, wattage, etc..
Parts that have special safety characteristics are
identified by a ! on schematics and in parts lists.
Use of a substitute replacement that does not
have the same safety characteristics as the
recommended replacement part might create
shock, fire, and/or other hazards. The product's
safety is under review continuously and new
instructions are issued whenever appropriate.
Prior to shipment from the factory, our products
are strictly inspected to confirm they comply with
the recognized product safety and electrical codes
of the countries in which they are to be sold.
However, in order to maintain such compliance, it
is equally important to implement the following
precautions when a set is being serviced.
2-2 LTVP_ISP
Precautions during Servicing
A. Parts identified by the ! symbol are critical for
safety.
Replace only with part number specified.
B. In addition to safety, other parts and assemblies
are specified for conformance with regulations
applying to spurious radiation. These must also be
replaced only with specified replacements.
Examples: RF converters, RF cables, noise
blocking capacitors, and noise blocking filters, etc.
C. Use specified internal wiring. Note especially:
1) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
D. Use specified insulating materials for hazardous
live parts. Note especially:
1) Insulation Tape
2) PVC tubing
3) Spacers
4) Insulators for transistors.
E. When replacing AC primary side components
(transformers, power cord, etc.), wrap ends of
wires securely about the terminals before
soldering.
F. Observe that the wires do not contact heat
producing parts (heat sinks, oxide metal film
resistors, fusible resistors, etc.)
G. Check that replaced wires do not contact sharp
edged or pointed parts.
H. When a power cord has been replaced, check that
5~6 kg of force in any direction will not loosen it.
I. Also check areas surrounding repaired locations.
J. Use care that foreign objects (screws, solder
droplets, etc.) do not remain inside the set.
K. Crimp type wire connector
The power transformer uses crimp type
connectors which connect the power cord and the
primary side of the transformer. When replacing
the transformer, follow these steps carefully and
precisely to prevent shock hazards.
Replacement procedure
1) Remove the old connector by cutting the wires
at a point close to the connector.
Important: Do not re-use a connector (discard
it).
2) Strip about 15 mm of the insulation from the
ends of the wires. If the wires are stranded,
twist the strands to avoid frayed conductors.
3) Align the lengths of the wires to be connected.
Insert the wires fully into the connector.
4) Use the crimping tool to crimp the metal sleeve
at the center position. Be sure to crimp fully to
the complete closure of the tool.
L. When connecting or disconnecting the internal
connectors, first, disconnect the AC plug from the
AC supply outlet.
M. When installing parts or assembling the cabinet
parts, be sure to use the proper screws and
tighten certainly.
2-3 LTVP_ISP
Safety Check after Servicing
Examine the area surrounding the repaired location
for damage or deterioration. Observe that screws,
parts and wires have been returned to original positions. Afterwards, perform the following tests and confirm the specified values in order to verify compliance
with safety standards.
1. Clearance Distance
When replacing primary circuit components, confirm
specified clearance distance (d) and (d') between soldered terminals, and between terminals and surrounding metallic parts. (See Fig. 1)
Table 1 : Ratings for selected area
Chassis or Secondary Conductor
Primary Circuit Terminals
dd’
AC Line Voltage Clearance Distance (d), (d’)
230 V
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
≥ 3mm(d)
≥ 6 mm(d’)
2. Leakage Current Test
Confirm the specified (or lower) leakage current between B (earth ground, power cord plug prongs) and
externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and output terminals, microphone jacks, earphone jacks, etc.).
Measuring Method : (Power ON)
Insert load Z between B (earth ground, power cord
plug prongs) and exposed accessible parts. Use an
AC voltmeter to measure across both terminals of load
Z. See Fig. 2 and following table.
Table 2: Leakage current ratings for selected areas
Exposed Accessible Part
Z
One side of
B
Power Cord Plug Prongs
Fig. 1
AC Voltmeter
(High Impedance)
Fig. 2
AC Line Voltage Load Z Leakage Current (i)
2kΩ RES.
Connected in
parallel
230 V
50kΩ RES.
Connected in
parallel
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
i≤0.7mA AC Peak
i≤2mA DC
i≤0.7mA AC Peak
i≤2mA DC
2-4 LTVP_ISP
One side of power cord plug
prongs (B) to:
Antenna terminals
A/V Input, Output
RF or
STANDARD NOTES FOR SERVICING
Circuit Board Indications
1. The output pin of the 3 pin Regulator ICs is
indicated as shown.
Top View
Out
2. For other ICs, pin 1 and every fifth pin are
indicated as shown.
Pin 1
3. The 1st pin of every male connector is indicated as
shown.
Pin 1
Input
In
Bottom View
5
10
Pb (Lead) Free Solder
Pb free mark will be found on PCBs which use Pb
free solder. (Refer to figure.) For PCBs with Pb free
mark, be sure to use Pb free solder. For PCBs
without Pb free mark, use standard solder.
Pb free mark
How to Remove / Install Flat Pack-IC
1. Removal
With Hot-Air Flat Pack-IC Desoldering Machine:
1. Prepare the hot-air flat pack-IC desoldering
machine, then apply hot air to the Flat Pack-IC
(about 5 to 6 seconds). (Fig. S-1-1)
Fig. S-1-1
2. Remove the flat pack-IC with tweezers while
applying the hot air.
3. Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
4. Release the flat pack-IC from the CBA using
tweezers. (Fig. S-1-6)
CAUTION:
1. The Flat Pack-IC shape may differ by models. Use
an appropriate hot-air flat pack-IC desoldering
machine, whose shape matches that of the Flat
Pack-IC.
2. Do not supply hot air to the chip parts around the
flat pack-IC for over 6 seconds because damage
to the chip parts may occur. Put masking tape
around the flat pack-IC to protect other parts from
damage. (Fig. S-1-2)
3. The flat pack-IC on the CBA is affixed with glue, so
be careful not to break or damage the foil of each
pin or the solder lands under the IC when
removing it.
Hot-air
Flat Pack-IC
Desoldering
CBA
Masking
Tape
Tweezers
3-1 TVP_SN
Machine
Flat Pack-IC
Fig. S-1-2
With Soldering Iron:
1. Using desoldering braid, remove the solder from
all pins of the flat pack-IC. When you use solder
flux which is applied to all pins of the flat pack-IC,
you can remove it easily. (Fig. S-1-3)
Flat Pack-IC
Desoldering Braid
Soldering Iron
Fig. S-1-3
2. Lift each lead of the flat pack-IC upward one by
one, using a sharp pin or wire to which solder will
not adhere (iron wire). When heating the pins, use
a fine tip soldering iron or a hot air desoldering
machine. (Fig. S-1-4)
With Iron Wire:
1. Using desoldering braid, remove the solder from
all pins of the flat pack-IC. When you use solder
flux which is applied to all pins of the flat pack-IC,
you can remove it easily. (Fig. S-1-3)
2. Affix the wire to a workbench or solid mounting
point, as shown in Fig. S-1-5.
3. While heating the pins using a fine tip soldering
iron or hot air blower, pull up the wire as the solder
melts so as to lift the IC leads from the CBA
contact pads as shown in Fig. S-1-5.
4. Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
5. Release the flat pack-IC from the CBA using
tweezers. (Fig. S-1-6)
Note: When using a soldering iron, care must be
taken to ensure that the flat pack-IC is not
being held by glue. When the flat pack-IC is
removed from the CBA, handle it gently
because it may be damaged if force is applied.
Sharp
Pin
Fine Tip
Soldering Iron
3. Bottom of the flat pack-IC is fixed with glue to the
CBA; when removing entire flat pack-IC, first apply
soldering iron to center of the flat pack-IC and heat
up. Then remove (glue will be melted). (Fig. S-1-6)
4. Release the flat pack-IC from the CBA using
tweezers. (Fig. S-1-6)
Fig. S-1-4
To Solid
Mounting Point
CBA
Hot Air Blower
or
Iron Wire
Soldering Iron
Fig. S-1-5
Fine Tip
Soldering Iron
Flat Pack-IC
Tweezers
Fig. S-1-6
3-2 TVP_SN
2. Installation
1. Using desoldering braid, remove the solder from
the foil of each pin of the flat pack-IC on the CBA
so you can install a replacement flat pack-IC more
easily.
2. The “●” mark on the flat pack-IC indicates pin 1.
(See Fig. S-1-7.) Be sure this mark matches the 1
on the PCB when positioning for installation. Then
presolder the four corners of the flat pack-IC. (See
Fig. S-1-8.)
3. Solder all pins of the flat pack-IC. Be sure that
none of the pins have solder bridges.
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Fig. S-1-7
Instructions for Handling Semiconductors
Electrostatic breakdown of the semi-conductors may
occur due to a potential difference caused by
electrostatic charge during unpacking or repair work.
1. Ground for Human Body
Be sure to wear a grounding band (1 MΩ) that is
properly grounded to remove any static electricity that
may be charged on the body.
2. Ground for Workbench
Be sure to place a conductive sheet or copper plate
with proper grounding (1 MΩ) on the workbench or
other surface, where the semi-conductors are to be
placed. Because the static electricity charge on
clothing will not escape through the body grounding
band, be careful to avoid contacting semi-conductors
with your clothing.
<Incorrect>
CBA
Presolder
Flat Pack-IC
Fig. S-1-8
<Correct>
1MΩ
CBA
Grounding Band
1MΩ
CBA
Conductive Sheet or
Copper Plate
3-3 TVP_SN
CABINET DISASSEMBLY INSTRUCTIONS
[LCD-A1504]
1. Disassembly Flowchart
This flowchart indicates the disassembly steps for the
cabinet parts and the CBA in order to gain access to
item(s) to be serviced. When reassembling, follow the
steps in reverse order. Bend, route and dress the
cables as they were.
[1] Rear Cabinet
[2] Jack Holder
[3] Jack Shield
[4] LCD Main CBA
[5] Main CBA
[8] Speaker (s)
[9] Front Cabinet
[6] LCD Module
Assembly
[7] Function CBA
2. Disassembly Method
REMOVAL
ID/
LOC.
No.
[1] Rear Cabinet D1 6(S-1), 3(S-2) ---
[2] Jack Holder D2 2(S-3), (S-4) ---
[3] Jack Shield D2 --------- ---
[4]
[5] Main CBA
[6]
[7] Function CBA
[8] Speaker (s)
[9] Front Cabinet D2 --------------- ---
PAR T
LCD Main
CBA
LCD Module
Assembly
Fig.
No.
D2
D3
D2
D3
D2
D3
D2
D3
D2
D3
REMOVE/
*UNHOOK/
UNLOCK/
RELEASE/UNPLUG/
DESOLDER
3(S-5), *CN320A,
*CN321A, *CN101B,
*CN102B, *CN103B
5(S-6), (S-7),
*CN801, *CN802,
*T401, *T402,
*CN31A
7(S-8) ---
4(S-9) ---
4(S-10) ---
Note
---
---
↓
(1)
Note:
(1): Order of steps in Procedure. When reassembling,
follow the steps in reverse order.These numbers
are also used as the Identification (location) No. of
parts in Figures.
(2): Parts to be removed or installed.
(3): Fig. No. showing Procedure of Part Location.
(4): Identification of part to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
S=Screw, P=Spring, L=Locking Tab,
CN=Connector, *=Unhook, Unlock, Release,
Unplug, or Desolder
2(S-2) = two screws (S-2)
(5): Refer to the following Reference Notes in the
Ta b le .
↓
(2)
↓
(3)
↓
(4)
↓
(5)
4-1 L4100DC
[1] Rear Cabinet
(S-1)
(S-1)
(S-2)
(S-1)
(S-2)
[9] Front Cabinet
(S-10)
[7] Function CBA
[8] Speaker
(S-10)
(S-9)
(S-8)
(S-10)
(S-1)
(S-8)
[5] Main CBA
(S-8)
[2] Jack Holder
[3] Jack Shield
Fig. D1
(S-3)
(S-4)
(S-3)
(S-10)
[8] Speaker
[6] LCD Module Assembly
(S-6)
(S-8)
(S-6)
(S-6)
(S-7)
[4] LCD Main CBA
(S-5)
(S-5)
Fig. D2
4-2 L4100DC
(S-5)
Wiring Diagram
To LCD Module
Assembly
LCD Main CBA
T402
T401
To LCD Module Assembly
CN320A CN321A
CN101B
CN101A CN102A
CN102B CN103B
CN103A
Function CBA
Main CBA
CN31A
CN801
To Speaker
CN31B
CN802
To Speaker
Fig. D3
4-3 L4100DC
[LCD-A2004]
2. Disassembly Method
1. Disassembly Flowchart
This flowchart indicates the disassembly steps for the
cabinet parts and the CBA in order to gain access to
item(s) to be serviced. When reassembling, follow the
steps in reverse order. Bend, route and dress the
cables as they were.
[9] IR Sensor
CBA
[10] Speaker (s)
[6] Inverter CBA
[8] Function CBA
[1] Rear Cabinet
[2] Jack Holder
[3] Jack Shield
[5] Main CBA
[7] LCD Module
Assembly
[11] Front
Cabinet
[4] LCD Main CBA
REMOVAL
ID/
LOC.
No.
PA RT
REMOVE/
*UNHOOK/UNLOCK/
Fig.
No.
RELEASE/UNPLUG/
DESOLDER
[1] Rear Cabinet D1 11(S-1), 3(S-2) ---
[2] Jack Holder D2 2(S-3), (S-4) ---
[3] Jack Shield D2 ---------- ---
3(S-5), *CN310A,
[4]
LCD Main
CBA
*CN311A, *CN313A,
D2
D3
*CN101B, *CN102B,
*CN103B
5(S-6), *CN801,
[5] Main CBA
[6] Inverter CBA
LCD Module
[7]
Assembly
[8] Function CBA
IR Sensor
[9]
CBA
[10] Speaker (s)
D2
*CN802, *CN405,
D3
*CN51, *CN53
6(S-7), *T1401,
D2
*T1402, *T1403,
D3
*T1404
D2
13(S-8) ---
D3
D2
4(S-9) ---
D3
D2
2(S-10) ---
D3
D2
4(S-11) ---
D3
Note
---
---
---
[11] Front Cabinet D2 --------------- ---
↓
(1)
↓
(2)
(3)
↓
↓
(4)
↓
(5)
(1): Order of steps in Procedure. When reassembling,
follow the steps in reverse order.These numbers
are also used as the Identification (location) No. of
parts in Figures.
(2): Parts to be removed or installed.
(3): Fig. No. showing Procedure of Part Location.
(4): Identification of part to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
S=Screw, P=Spring, L=Locking Tab, CN=Connec-
tor, *=Unhook, Unlock, Release, Unplug, or
Desolder
2(S-2) = two screws (S-2)
(5): Refer to the following Reference Notes in the
Ta b le .
4-4 L4200DC
(S-1)
[11] Front Cabinet
(S-1)
[1] Rear Cabinet
(S-1)
(S-1)
[8] Function CBA
(S-9)
(S-1)
(S-1)
(S-2)
(S-1)
(S-2)
(S-1)
Fig. D1
(S-10)
[9] IR Sensor CBA
[7] LCD Module Assembly
(S-11)
[10] Speaker
(S-9)
[10] Speaker
(S-10)
(S-11)
(S-8)
[6] Inverter CBA
(S-8)
(S-7)
(S-7)
(S-8)
(S-7)
(S-8)
[3] Jack Shield
[5] Main CBA
(S-6)
(S-6)
[2] Jack Holder
(S-3)
(S-4)
(S-3)
(S-6)
(S-5)
[4] LCD Main CBA
Fig. D2
4-5 L4200DC
Cable Wiring Diagram
To LCD Module Assembly
To LCD
Module
Assembly
To LCD
Module
Assembly
Inverter CBA
T1402
T1401
CN1401
T1404
T1403
LCD Main CBA
Main CBA
CN405
CN310A CN311A
CN101B
CN101A CN102A
CN801
CN102B CN103B
CN313A
CN103A
CN53
CN51
CN802
To Speaker
CN51A
To Speaker
Function CBAIR Sensor CBA
Fig. D3
4-6 L4200DC
HOW TO INITIALIZE THE LCD TELEVISION
To put the program back at the factory-default,
initialize the LCD television as the following procedure.
How to initialize the LCD television:
1. Turn the power on. (Use main power on the TV
unit.)
2. To enter the service mode, press [STANDBY], [2],
[7], [1], and [MUTE] buttons on the remote control
unit in that order within 5 seconds.
- To cancel the service mode, press [STANDBY]
button on the remote control.
3. To initialize the LCD television, press “DISPLAY”
button on the remote control unit.
4. Confirm "FF" indication on the upper right of the
screen.
5-1 L4100INT
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note:
“CBA” is abbreviation for “Circuit Board Assem-
bly.”
NOTE:
Electrical adjustments are required after replacing
circuit components and certain mechanical parts. It is
important to perform these adjustments only after all
repairs and replacements have been completed.
Also, do not attempt these adjustments unless the
proper equipment is available.
Test Equipment Required
1. DC Voltmeter
2. Pattern Generator
3. Color Analyzer
How to Set up the Service mode:
1. Turn the power on. (Use main power on the TV
unit.)
2. Press [STANDBY], [2], [7], [1], and [MUTE] buttons
on the remote control unit in that order within 5
seconds.
- To cancel the service mode, press [STANDBY]
button on the remote control.
1. Initial Setting
General
Enter the Service mode.
Set the each initial data as shown on table 1 below.
Table 1: Initial Data
BUTTON
ITEM
BRT(PAL)
CNT(PAL) 174 174
CLR-R(PAL) 78 74
CLR-B(PAL) 78 74
SHR(PAL) 143 143
S-BRT(PAL)
S-CNT(PAL) 174 174
S-CLR-R(PAL) 78 74
S-CLR-B(PAL) 78 74
S-SHR(PAL) 143 143
C-BRT(PAL)
C-CNT(PAL) 122 132
C-CLR-R(PAL) 156 154
C-CLR-B(PAL) 156 154
C-SHR(PAL) 143 143
BRT(SECAM)
CNT(SECAM) 174 174
CLR-R(SECAM) 78 74
CLR-B(SECAM) 78 74
SHR(SECAM) 143 143
S-BRT(SECAM)
S-CNT(SECAM) 174 174
S-CLR-R(SECAM) 78 74
S-CLR-B(SECAM) 78 74
S-SHR(SECAM) 143 143
C-BRT(SECAM)
C-CNT(SECAM) 122 132
C-CLR-R(SECAM) 156 154
C-CLR-B(SECAM) 156 154
C-SHR(SECAM) 143 143
BRT(NTSC)
CNT(NTSC) 172 174
CLR-R(NTSC) 78 70
CLR-B(NTSC) 78 70
TNT(NTSC) 148 148
SHR(NTSC) 143 143
S-BRT(NTSC)
S-CNT(NTSC) 172 174
S-CLR-R(NTSC) 78 70
S-CLR-B(NTSC) 78 70
S-TNT(NTSC) 148 148
S-SHR(NTSC) 143 143
(on the remote
control)
MENU → 1
MENU → 2
MENU → 3
MENU → 4
MENU → 5
MENU → 6
MENU → 7
MENU → 8
DATA VALUE
LCD-
A1504
130 134
130 134
134 134
130 134
130 134
134 134
134 134
134 134
LCD-
A2004
6-1 L4100EA
BUTTON
ITEM
C-BRT(NTSC)
C-CNT(NTSC) 122 132
C-CLR-R(NTSC) 156 154
C-CLR-B(NTSC) 156 154
C-TNT(NTSC) 148 148
C-SHR(NTSC) 143 143
BRIGHT 0 0 0
NORMAL 0 40 65
DARK 0 95 98
COR(C/D/S-1) VOL. p → 1 131 131
COG(C/D/S-1) VOL. p → 2 131 131
COB(C/D/S-1) VOL. p → 3 131 131
DR(C/D/S-1) VOL. p → 4 145 145
DG(C/D/S-1) VOL. p → 5 143 143
DB(C/D/S-1) VOL. p → 6 140 140
SBR(C/D/S-1) VOL. p → 70 0
SBB(C/D/S-1) VOL. p → 90 0
C-COR(C/D/S-2) VOL. p → 1 131 131
C-COG(C/D/S-2) VOL. p → 2 131 131
C-COB(C/D/S-2) VOL. p → 3 131 131
C-DR(C/D/S-2) VOL. p → 4 145 145
C-DG(C/D/S-2) VOL. p → 5 143 143
C-DB(C/D/S-2) VOL. p → 6 140 140
C-SBR(C/D/S-2) VOL. p → 70 0
C-SBB(C/D/S-2) VOL. p → 90 0
7F
LAST POWER OFF OFF
SYSTEM
NCM ON ON
ASPECT OFF OFF
RUSSIAN OFF OFF
(on the remote
control)
MENU → 9
VOL. p
DATA VALUE
LCD-
A1504
134 134
PA L - BG PA L - BG
LCD-
A2004
FF FF
3. Flicker Adjustment
Adjustment Point: R977 (LCD Main CBA)
LCD Main CBA
R977
1. Enter the Service mode.
2. Press “2” button on the remote control unit.
The following screen appears.
3. If Flicker Adjustment is not fit, the screen become
the following.
FLASH
(Go and Off)
2. +B Adjustment
Purpose: To obtain correct operation.
Symptom of Misadjustment: The picture is dark and
the unit does not operate correctly.
Test Point Adj. Point
TP401 (+B)
TP300 (GND)
M. EQ. Spec.
DC Voltmeter
Note: TP401(+B), TP300(GND), VR649 --- Main CBA
1. Connect DC Volt Meter to TP401 and
TP300(GND).
2. Adjust VR649 so that the voltage of TP401
becomes +13.0±0.3V DC [LCD-A1504] or
+21.0±0.3V DC [LCD-A2004].
+13.0±0.3V DC [LCD-A1504]
+21.0±0.3V DC [LCD-A2004]
VR649
4. Adjust R977 so that flash stops.
6-2 L4100EA
The following adjustment normally are not
attempted in the field. Only when replacing the
LCD Panel then adjust as a preparation.
4. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Test Point Adj. Point Mode Input
[RF/AV2(CVBS)]
Screen
Pattern Generator,
Color analyzer
VOL. p
buttons
M. EQ. Spec.
C/D/S-1
[AV1(RGB)]
C/D/S-2
Figure
x: 260 to 320,
y: 270 to 330
White Purity
(APL 80%)
or
(APL 40%)
It carries out in a darkroom.
Perpendicularity
L = 50 cm
INPUT: WHITE 80%
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80% or APL 40%).
3. Set the color analyzer to the CHROMA mode and
bring the optical receptor to the center on the
LCD-Panel surface after zero point calibration as
shown above.
Note: The optical receptor must be set
perpendicularly to the LCD Panel surface.
4. [RF/AV2(CVBS)]
Enter the Service mode. Press “VOL p” button on
the remote control unit and select “C/D/S-1” mode.
[AV1(RGB)]
Enter the Service mode. Press “VOL p” button on
the remote control unit and select “C/D/S-2” mode.
5. [RF/AV2(CVBS)]
When “x” value and “y” value are not within
specification, adjust “DB (C/D/S-1)” or “DR (C/D/S-
1)”. Refer to “1. Initial Setting.”
Note: “DB(C/D/S1)” or “DR(C/D/S1)” must be
adjusted within ±10.
[AV1(RGB)]
When “x” value and “y” value are not within
specification, adjust “C-DB(C/D/S-2)” or “C-DR(C/
D/S-2)”. Refer to “1. Initial Setting.”
Note: “C-DB(C/D/S-2)” or “C-DR(C/D/S-2)” must
be adjusted within ±10.
6. Turn the power off and on again. (Main power
button on the TV unit.)
Color Analyzer
6-3 L4100EA
BLOCK DIAGRAMS
System Control Block Diagram
AL+5V
FUNCTION CBA
STAND BY
D30
AL+5V
SENSOR
REMOTE
KEY SWITCH
KEY SWITCH
RCV30
CN31B
RCV-IN77
KEY-IN-144
KEY-IN-233
CN31A
A
FUNCTION CBA
D51
KEY SWITCH
KEY SWITCH
CN51A
KEY-IN-144
KEY-IN-233
CN51
B
REMOTE
RCV51
CLN53
RCV-IN33
CN53
STAND BY
IR SENSOR CBA
SENSOR
BACKLIGHT-ADJ
CN1401
BACKLIGHT-ADJ
11 11
CN405
INVERTER CBA
TO LCD BACKLIGHT
BLOCK DIAGRAM (B)
P-ON-H
PROTECT-1
BACKLIGHT-SW
P-ON-H13 13
BACKLIGHT-SW
PROTECT-112 12
10 10
CN102A
KEY-IN-144
RCV-IN11
KEY-IN-255
TO POWER SUPPLY
TO LCD BACKLIGHT
BLOCK DIAGRAM (A)
PROTECT-1
BACKLIGHT-SW
BACKLIGHT-ADJ
A
BACKLIGHT-SW
BACKLIGHT-ADJ
BUS-OPEN(NU)
33
22
20 20
BLOCK DIAGRAM
P-ON-H
PROTECT-1
PROTECT-2
PROTECT-3
P-ON-H66
PROTECT-113 13
PROTECT-214 14
PROTECT-316 16
P-ON-H2
AFT-IN11 11
P-ON-H222 22
SCL
SDA
S-SW
AFT-IN
P-25V-ON
S/C-JACK-MUTE
VOLUME77
INPUT-099
S-SW15 15
INPUT-110 10
SCL18 18
SDA19 19
TO IF/VIDEO
BLOCK DIAGRAM
FBIN
INPUT-0
INPUT-1
SLOW-SW
RAPID-SW
A-MUTE(NU)
SLOW-SW19 19
RAPID-SW18 18
P-25V-ON23 23
88
P-ON-L(NU)24 24
RGB-CONTROL(NU)
26 26
SP-MUTE
INSEL-MUTE
S/C-JACK-MUTE
INSEL-MUTE
S/C-JACK-MUTE
17 17
16 16
TO AUDIO
BLOCK DIAGRAM
SCL
SDA
NICAM-RESET
NICAM-RESET
SP-MUTE20 20
FBIN25 25
22 22
VOLUME
MAIN CBALCD MAIN CBA UNIT
A
B
Mark
Model
LCD-A1504
LCD-A2004
Comparison Chart of
Models & Marks
X151
10MHz
IC151
(MICRO CONPUTER)
CN301(NO CONNECTION)
5
DVP-RESET-PC8DVP-CLK-PC
DVP-SOUT-PC6DVP-SIN-PC7DVP-CS-PC4MPSEL-0 3
13
XIN
BUS-OPEN 2
11
XOUT
AL+5V
5
RESET
IC153
IC301
(LCD DRIVE /
SIGNAL PROCESS)
4
10
RESET
2DVP-RESET
79
83
MPSEL-0
DVP-RESET-PC
2DVP-CLK42DVP-SIN
5
REG+3.3V
3.3V<-->5V
CONVERTER
Q152
57
DVP-CLK
3.3V<-->5V
Q153
CN102B
CONVERTER
Q154
59
DVP-SIN
93
16
92
RCV-IN
KEY-IN-1
KEY-IN-2
2DVP-SOUT
3
3.3V<-->5V
CONVERTER
Q155
585060
DVP-SOUT
52
89
22
26BUS-OPEN(NU)
PROTECT-1
BACKLIGHT-SW
BACKLIGHT-ADJ
2DVP-CS
2
3.3V<-->5V
CONVERTER
Q156
DVP-CS
90756
88
PROTECT-2
PROTECT-3
H-SYNK
19
3.3V<-->5V
CONVERTER
7
89
QH
FBIN
59
P-ON-H
P-ON-H2
91
AFT-IN
24
46
277845
28
SCL
SDA
S-SW
INPUT-0
INPUT-1
VOLUME
BUSY-FLASH
SCLK-FLASH
RXD-FLASH
CE-FLASH(NU)
EPM-FLASH(NU)
3039314432
CN104(NO CONNECTION)
SCLK 3
BUSY 2
RXD 4
EPM(NU) 6
CE(NU) 5
CN103B CN103A
77
A-MUTE
CNVSS
TXD-FLASH
29
CNVSS 9
TXD 10
P-25V-ON
AL+5V
RESET 8
87
RAPID-SW-IN
IC152
23
SLOW-SW-IN
(MEMORY)
20
838525
58
P-ON-L(NU)
SC-VIDEO-MUTE
RGB-CONTROL(NU)
EEP-SCL
EEP-SDA
33
34
6
5
7
WP
SCL
SDA
1
84INSEL-MUTE
SP-MUTE
NICAM-RESET
CN105(NO CONNECTION)
EEP-SDA 2
EEP-SCL 1
BUS-OPEN 4
CN105 IS
USED FOR
ADJUSTMENT
AT FACTORY
7-1
L4100BLS
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