FUNAI LC5-D20BB User manual

SERVICE MANUAL
20"COLOR LCD TELEVISION
LC5-D20BB

20″COLOR LCD TELEVISION
LC5-D20BB
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
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
Electrical Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1
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.

1-1 A7340SP
SPECIFICATIONS
<TUNER> ANT. Input ------------------- 80 dBµV, Video: PAL 87.5%, Audio: 30 kHz dev (1 kHz Sin)
Test Input Signal----------- 400 Hz 30% modulation
<LCD PANEL>
<VIDEO>
<AUDIO>
All items are measured across 8 Ωload at speaker output terminal with L.P.F.
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.
Description Condition Unit Nominal Limit
1. Intermediate Freq. Picture
PAL-BG/I/DK, SECAM-L
SECAM-L’
Sound
PA L - B G
PA L -I
PAL-DK, SECAM-L
SECAM-L’
MHz
MHz
MHz
MHz
MHz
MHz
38.9
33.9
33.4
32.9
32.4
40.4
-
-
-
-
-
-
2. Video S/N (White 50%) CH-3 dB 45 40
3. Audio S/N
(Output Level 500mV)
-dB-40
Description Condition Unit Nominal Limit
1. Number of Pixels Horizontal
Vertical
pixels
pixels
640 x 3
480
-
-
2. Brightness cd/m2290 -
3. Response Time - msec 16 -
4. Support Color - - 16mil.(8bit) -
5. Viewing Angle Horizontal
Vertical
°
°-85 to 85 -85 to 70
-
Description Condition Unit Nominal Limit
1. Over Scan Horizontal
Vertical
%
%
5
5
10
10
2. Color Temperature -
x
y
°K 11000
0.276
0.282
-
0.276±0.03
0.282±0.03
3. Resolution Horizontal
Vertical
line
line
400
350
-
-
Description Condition Unit Nominal Limit
1. Audio Output Power 10% THD: Lch/Rch W 0.95/0.95 0.75/0.75
2. Audio Distortion 500mW: Lch/Rch % 0.6/0.6 <4
3. Audio Freq. Response
- 6dB: Lch
- 6dB: Rch
Hz
Hz
50 to 12K
50 to 12K
-
-
4. Audio S/N VIDEO 1
VIDEO 2
dB
dB
-
-
40
40

2-1 LTVP_ISP
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.
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.
ALSO TEST WITH
PLUG REVERSED
USING AC
ADAPTER PLUG
AS REQUIRED
TEST ALL EXPOSED
METAL SURFACES
READING SHOULD
NOT BE ABOVE 0.5 mA
EARTH
GROUND
_
DEVICE
LEAKAGE
CURRENT
TESTER
+
BEING
TESTED

2-2 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
1.0 V 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.

2-3 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. When connecting or disconnecting the internal
connectors, first, disconnect the AC plug from the
AC supply outlet.
L. When installing parts or assembling the cabinet
parts, be sure to use the proper screws and
tighten certainly.

2-4 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 posi-
tions. Afterwards, perform the following tests and con-
firm 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 sol-
dered terminals, and between terminals and surround-
ing metallic parts. (See Fig. 1)
Table 1 : Ratings for selected area
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
2. Leakage Current Test
Confirm the specified (or lower) leakage current be-
tween B (earth ground, power cord plug prongs) and
externally exposed accessible parts (RF terminals, an-
tenna terminals, video and audio input and output ter-
minals, 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
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
AC Line Voltage Clearance Distance (d), (d’)
220 to 240 V ≥3mm(d)
≥6 mm(d’)
Fig. 1
Chassis or Secondary Conductor
Primary Circuit
d' d
Fig. 2
AC Voltmeter
(High Impedance)
Exposed Accessible Part
BOne side of
Power Cord Plug Prongs
Z
AC Line Voltage Load Z Leakage Current (i) One side of power cord plug
prongs (B) to:
220 to 240 V
2kΩ RES.
Connected in
parallel
i≤0.7mA AC Peak
i≤2mA DC
RF or
Antenna terminals
50kΩRES.
Connected in
parallel
i≤0.7mA AC Peak
i≤2mA DC A/V Input, Output

3-1 TVP_SN
STANDARD NOTES FOR SERVICING
Circuit Board Indications
1. The output pin of the 3 pin Regulator ICs is
indicated as shown.
2. For other ICs, pin 1 and every fifth pin are
indicated as shown.
3. The 1st pin of every male connector is indicated as
shown.
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.
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)
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.
Top View
Out In
Bottom View
Input
5
10
Pin 1
Pin 1
Pb free mark
Fig. S-1-1
Hot-air
Flat Pack-IC
Desoldering
Machine
CBA
Flat Pack-IC
Tweezers
Masking
Tape
Fig. S-1-2

3-2 TVP_SN
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)
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)
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)
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.
Flat Pack-IC Desoldering Braid
Soldering Iron
Fig. S-1-3
Fine Tip
Soldering Iron
Sharp
Pin
Fig. S-1-4
To Solid
Mounting Point
Soldering Iron
Iron Wire
or
Hot Air Blower
Fig. S-1-5
Fine Tip
Soldering Iron
CBA
Flat Pack-IC
Tweezers
Fig. S-1-6

3-3 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.
Instructions for Handling Semi-
conductors
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.
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark. Fig. S-1-7
Presolder
CBA
Flat Pack-IC
Fig. S-1-8
<Incorrect>
CBA
Grounding Band
Conductive Sheet or
Copper Plate
1MΩ
1MΩ
<Correct>
CBA

4-1 A7340DC
CABINET DISASSEMBLY INSTRUCTIONS
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.
2. Disassembly Method
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 parts to be removed, unhooked,
unlocked, released, unplugged, unclamped, or
desoldered.
P = Spring, L = Locking Tab, S = Screw,
CN = Connector
* = Unhook, Unlock, Release, Unplug, or Desolder
e.g. 2(S-2) = two Screws (S-2),
2(L-2) = two Locking Tabs (L-2)
(5) Refer to the following "Reference Notes in the
Ta b l e . "
Step/
Loc.
No.
Part
Removal
Fig.
No.
Remove/*Unhook/
Unlock/Release/
Unplug/Unclamp/
Desolder
Note
[1] Arm
Assembly D1 4(S-1), 6(S-2) ---
[2] Stand
Cover D1 --------------- ---
[3] Rear
Cabinet D1 11(S-3), (S-4) ---
[4] Function
CBA
D2
D3 3(S-5), *CN51A ---
[5] Tilt Stand
Holder D2 2(S-6) ---
[6] IR Sensor
CBA
D2
D3 (S-7), *CLN53 ---
[7] Jack Holder D2 2(S-8) ---
[8] Main CBA D2
D3
9(S-9), *CN101B,
*CN102B, *CN103B,
*CN401, *CN403,
*CN801, *CN802,
Earth Plate
---
[7] Jack Holder
[5] Tilt Stand Holder[11] Junction-B CBA
[1] Arm Assembly
[2] Stand Cover
[3] Rear Cabinet[10] Junction-A CBA
[4] Function CBA[6] IR Sensor CBA
[12] Speaker(s)
[13] Front Cabinet
[8] Main CBA
[9] LCD Main CBA
Unit & Liquid Crystal
Panel Unit
[9]
LCD Main
CBA Unit &
Liquid
Crystal
Panel Unit
D2 11(S-10) ---
[10] Junction-A
CBA
D2
D3 Desolder ---
[11] Junction-B
CBA
D2
D3 Desolder ---
[12] Speaker (s) D2 4(S-11), Speaker
Holder(s) ---
[13] Front
Cabinet D2 --------------- ---
↓
(1)
↓
(2)
↓
(3)
↓
(4)
↓
(5)
Step/
Loc.
No.
Part
Removal
Fig.
No.
Remove/*Unhook/
Unlock/Release/
Unplug/Unclamp/
Desolder
Note

4-2 A7340DC
[3] Rear Cabinet
[1] Arm Assembly
(S-3)
(S-3)
(S-1)
(S-2)
(S-3)
[2] Stand Cover
(S-4)
Fig. D1

4-3 A7340DC
(S-7)
Speaker
Holders
(S-11)
(S-11)
(S-8)
[6] IR Sensor
CBA
[7] Jack Holder
[4] Function CBA
[12] Speaker
[10] Junction-A
CBA
[13] Front Cabinet
Speaker Holders
[8] Main CBA
[12] Speaker (S-5)
(S-9)
(S-9)
(S-9)
(S-10)
[9] LCD Main CBA Unit &
Liquid Crystal Panel Unit
[5] Tilt Stand Holder
(S-6)
[11] Junction-B
CBA
(S-10)
(S-10)
(S-10)
(S-10)
Earth Plate
(S-9)
Fig. D2

4-4 A7340DC
TV Cable Wiring Diagram
IR Sensor CBA
Function CBA
CN801
CN403
CN401
CN51B
CLN53
CN101A CN102A CN103A
CN103B
CN102B
CN101B
Main CBA
CN802
CN53
CN51A
CN1001 CN1000
LCD Main
CBA Unit
To Liquid
Crystal
Panel Unit
To Liquid
Crystal
Panel Unit
To
Speaker
CL801
Junction-A
CBA
CL802
To Speaker
Junction-B
CBA
Fig. D3

5-1 A7340INT
HOW TO INITIALIZE THE LCD TELEVISION
How to initialize the LCD television:
1. Turn the power on.
2. To enter the service mode, press [STANDBY-ON],
[2], [7], [1], and [ ] buttons on the remote control
unit in that order within 5 seconds.
- To cancel the service mode, press [STANDBY-
ON] button on the remote control.
3. Press [DISPLAY] button on the remote control unit
to initialize the LCD television.
4. Confirm "FF" indication on the upper right of the
screen.

6-1 A7340EA
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-ON], [2], [7], [1], and [ ] buttons
on the remote control unit in that order within 5
seconds.
- To cancel the service mode, press [STANDBY-ON]
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
ITEM
BUTTON
(on the remote
control)
DATA
VALUE
RF-BRT(PAL)
[SETUP(PAL)] →
[1]
130
RF-CNT(PAL) 170
RF-CLR-R(PAL) 84
RF-CLR-B(PAL) 81
RF-SHR(PAL) 143
AV-BRT(PAL)
[SETUP(PAL)] →
[2]
130
AV-CNT(PAL) 170
AV-CLR-R(PAL) 84
AV-CLR-B(PAL) 81
AV-SHR(PAL) 143
S-BRT(PAL)
[SETUP(PAL)] →
[3]
127
S-CNT(PAL) 175
S-CLR-R(PAL) 81
S-CLR-B(PAL) 86
S-SHR(PAL) 143
C-BRT(PAL)
[SETUP(PAL)] →
[4]
135
C-CNT(PAL) 190
C-CLR-R(PAL) 125
C-CLR-B(PAL) 140
C-SHR(PAL) 143
RF-BRT(SECAM)
[SETUP(SECAM)]
→[1]
130
RF-CNT(SECAM) 180
RF-CLR-R(SECAM) 80
RF-CLR-B(SECAM) 80
RF-SHR(SECAM) 143
AV-BRT(SECAM)
[SETUP(SECAM)]
→[2]
125
AV-CNT(SECAM) 180
AV-CLR-R(SECAM) 80
AV-CLR-B(SECAM) 80
AV-SHR(SECAM) 143
S-BRT(SECAM)
[SETUP(SECAM)]
→[3]
125
S-CNT(SECAM) 180
S-CLR-R(SECAM) 80
S-CLR-B(SECAM) 80
S-SHR(SECAM) 143
C-BRT(SECAM)
[SETUP(SECAM)]
→[4]
135
C-CNT(SECAM) 190
C-CLR-R(SECAM) 125
C-CLR-B(SECAM) 140
C-SHR(SECAM) 143

6-2 A7340EA
2. Flicker Adjustment
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 becomes
the following.
4. Press [P / ] buttons on the remote control
unit so that flash stops.
BRT(NTSC)
[SETUP(NTSC)]
→[2]
122
CNT(NTSC) 170
CLR-R(NTSC) 92
CLR-B(NTSC) 92
TNT(NTSC) 135
SHR(NTSC) 143
S-BRT(NTSC)
[SETUP(NTSC)]
→[3]
122
S-CNT(NTSC) 190
S-CLR-R(NTSC) 92
S-CLR-B(NTSC) 92
S-TNT(NTSC) 135
S-SHR(NTSC) 143
C-BRT(NTSC)
[SETUP(NTSC)]
→[4]
122
C-CNT(NTSC) 170
C-CLR-R(NTSC) 119
C-CLR-B(NTSC) 119
C-TNT(NTSC) 135
C-SHR(NTSC) 143
BRIGHT [0] 0
NORMAL [0] 40
DARK [0] 95
COR(C/D/S-1) [ -] →[1] 128
COG(C/D/S-1) [ -] →[2] 128
COB(C/D/S-1) [ -] →[3] 128
DR(C/D/S-1) [ -] →[4] 128
DG(C/D/S-1) [ -] →[5] 128
DB(C/D/S-1) [ -] →[6] 128
SBR(C/D/S-1) [ -] →[7] 0
SBB(C/D/S-1) [ -] →[9] 0
C-COR(C/D/S-2) [ -] →[1] 128
C-COG(C/D/S-2) [ -] →[2] 128
C-COB(C/D/S-2) [ -] →[3] 128
C-DR(C/D/S-2) [ -] →[4] 128
C-DG(C/D/S-2) [ -] →[5] 128
C-DB(C/D/S-2) [ -] →[6] 128
C-SBR(C/D/S-2) [ -] →[7] 0
C-SBB(C/D/S-2) [ -] →[9] 0
LAST POWER [ -] OFF
ITEM
BUTTON
(on the remote
control)
DATA
VALUE
VCOM
128
VCOM
128
FLASH (Go and Off)

6-3 A7340EA
The following adjustment normally are not
attempted in the field. Only when replacing the
LCD Panel then adjust as a preparation.
3. White Balance Adjustment
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
1. Operate the unit for more than 20 minutes.
2. Input the White Purity.
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 [ -] button on the
remote control unit and select “C/D/S-1” mode.
[AV1(RGB)]
Enter the Service mode. Press [ -] button on the
remote control unit and select “C/D/S-2” mode.
5. [RF/AV2(CVBS)]----(APL 80%)
Press [6] button to select “DB(C/D/S-1)” for Blue
adjustment. Press [4] button to select “DR(C/D/S-
1)” for Red adjustment. 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.”
[RF/AV2(CVBS)]----(APL 20%)
Press [3] button to select “COB(C/D/S-1)” for Blue
adjustment. Press [1] button to select “COR(C/D/
S-1)” for Red adjustment. When “x” value and “y”
value are not within specification, adjust “COB (C/
D/S-1)” or “COR (C/D/S-1)”. Refer to “1. Initial
Setting.”
6. [AV1(RGB)]----(APL 80%)
Press [6] button to select “C-DB(C/D/S-2)” for Blue
adjustment. Press [4] button to select “C-DR(C/D/
S-2)” for Red adjustment.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.”
[AV1(RGB)]----(APL 20%)
Press [3] button to select “C-COB(C/D/S-2)” for
Blue adjustment. Press [1] button to select “C-
COR(C/D/S-2)” for Red adjustment.When “x”
value and “y” value are not within specification,
a d j u s t “ C - C O B ( C / D / S - 2 ) ” o r “ C - C O R ( C / D / S - 2 ) ” .
Refer to “1. Initial Setting.”
7. Turn the power off and on again.
4. Sub-Brightness Adjustment
Purpose: To get proper brightness.
Symptom of Misadjustment: If Sub-Brightness is
incorrect, proper brightness cannot be obtained by
adjusting the Brightness Control.
1. Enter the Service mode. Then input above signal.
2. [RF/AV2(CVBS)]
Press [SETUP] button on the remote control unit
and press [1] on the service remote control
(selecting “BRT” mode).
[AV1(RGB)]
Press [SETUP] button on the service remote
control unit and press [3] on the service remote
control (selecting “C-BRT” mode).
3. Make sure that contrast and brightness controls
are set to initial position.
4. Confirm “C” position was beginning to bright.
5. If “C” position was beginning to bright, no need to
adjust.
6. If “C” position is not available or to be highly
brightness, then adjust IIC-BUS dada.
[RF/AV2(CVBS)]: BRT
[AV1(RGB)]: C-BRT
7. Turn the power off and on again.
Test Point Adj. Point Mode Input
Screen [ -]
button
[RF/AV2(CVBS)]
C/D/S-1
[AV1(RGB)]
C/D/S-2
White Purity
(APL 80%)
or
(APL 20%)
M. EQ. Spec.
Pattern Generator,
Color analyzer
x=
0.276 ± 0.03 ,
y=
0.282 ± 0.03
Figure
Color Analyzer
It carries out in a darkroom.
L = 3 cm
Perpendicularity
INPUT: WHITE 80%
Adj. Point Input
[SETUP]
button
Ant. input, Any channel,
SMPTE pattern,
[RF/AV2(CVBS)] : CG-931 (KENWOOD),
[AV1(RGB)]: CG-931 (KENWOOD),
W/O SETUP 7.5IRE
M. EQ. Spec.
Pattern
Generator See below
Figure
White
Black
C positionB position
A position

7-1
System Control Block Diagram
A7340BLS
BLOCK DIAGRAMS
FUNCTION CBA
KEY-IN-122
CN51A
KEY-IN-211
IR SENSOR CBA
CLN53 RCV51
D51
RCV-IN33 REMOTE
SENSOR
IC1006 (TV MICRO CONTROLLER)
3
134
5
121 114
CN103B CN103A
RCV-IN23 1 BACKLIGHT-ADJ
22 2
P-ON-H22 2 PROTECT-1420 PROTECT-2321 VOLUME420 INPUT-012 12 INPUT-111 13 S-SW16 8 SCL11 13 SDA10 14
115
KEY-IN-1
RCV-IN
113
BACKLIGH-SW
RESET
P-ON-H
PROTECT-1 PROTECT-2
VOLUME
SDA
SCL
INPUT-0 INPUT-1
S-SW
SCL
SDA
6
116 144
44
143 145
45
TO POWER SUPPLY BLOCK DIAGRAM TO AUDIO BLOCK DIAGRAM
BACKLIGHT-ADJ
P-ON-H
117
BUS-OPEN
PROTECT-1 PROTECT-2
VOLUME
INPUT-0 INPUT-1
S-SW
SCL
SDA
MAIN CBA
LCD MAIN CBA UNIT
4
KEY-IN-2
CN51B
CN53
RESET
Q1301, Q1302
AL+3.3V(D)
CN102B CN102A
KEY-IN-2123 KEY-IN-1222 BACKLIGHT-SW
23 1
RESET519
CN101B CN101A
AL+3.3V(D)
10 AFT-IN222
AFT-IN
142
SLOW-SW18 6 AUDIO-MUTE
717
FB-IN19 5
126
SLOW-SW
AUDIO-MUTE
8FB-IN
74 RAPID-SW20 4
RAPID-SW
147 124 141
P-25V-ON21 3
NICAM-RESET
618
P-25V-ON
S/C-JACK-MUTE
NICAM-RESET
S/C-JACK-MUTE
17 7 S/C-JACK-MUTE
AUDIO-MUTE
NICAM-RESET
FB-IN
RAPID-SW
SLOW-SW
S/C-JACK-MUTE
TO IF/VIDEO BLOCK DIAGRAM
AFT-IN
P-25V-ON
BACKLIGHT-ADJ
BACKLIGHT-SW
RESET
PROTECT-1 TO LCD BACKLIGHT
BLOCK DIAGRAM
KEY SWITCH KEY SWITCH
51 52
X1000 27MHz
XIN
XOUT
POWER
IC1002 (MEMORY)
SCL 6
SDA 5
7WP

7-2
IF/Video Block Diagram
A7340BLIF
JK751
15
11
7
VIDEO-B
VIDEO-G
VIDEO-R
CN102A
TU1
SIF OUT
SDA
SCL
7
10
9
SIF
MAIN CBA
VIDEO SIGNAL AUDIO SIGNAL
TO AUDIO BLOCK DIAGRAM
Q734
JK722 VIDEO-IN1 JK721 S-VIDEO-IN
TO SYSTEM CONTROL BLOCK DIAGRAM
CY
TO LCD BLOC
K
DIAGRAM (CN102B)
(TUNER UNIT)
BUFFER
VIDEO-B21 VIDEO-R19 VIDEO-G20 VIDEO122
CN103A
TO LCD BLOC
K
DIAGRAM (CN103B)
S-VIDEO-C2 TU-VIDEO10 VIDEO29 S-VIDEO-Y3
8
19
20
VIDEO-IN1
VIDEO-OUT
SLOW-SW
17 16
16
RAPID-SW
AFT
VIDEO
SDA
SCL
S-SW AFT-IN
S/C-JACK-MUTE
FB-IN
Q11
SLOW-SW
Q731
RAPID-SW
Q730
Q791
Q726
BUFFER
Q744
BUFFER
Q12
BUFFER
WF2WF3
WF8 WF7WF4 WF6
WF5