Sylvania 6620LE Schematic
SERVICE MANUAL
20” COLOR LCD TELEVISION
6620LE
IMPORTANT SAFETY NOTICE
Proper service and repair is important to the safe, reliable operation of all
Funai Equipment. The service procedures recommended by Funai and described in this service manual are effective methods of performing service
operations. Some of these service special tools should be used when and
as recommended.
It is important to note that this service manual contains various CAUTIONS
and NOTICES which should be carefully read in order to minimize the risk of
personal injury to service personnel. The possibility exists that improper
service methods may damage the equipment. It also is important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. Funai
could not possibly know, evaluate and advice the service trade of all conceivable ways in which service might be done or of the possible hazardous
consequences of each way. Consequently, Funai has not undertaken any
such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by Funai must first use all precautions thoroughly so that neither his safety nor the safe operation of the
equipment will be jeopardized by the service method selected.
TABLE OF CONTENTS
Specifications ........................................................ 1-1
Important Safety Precautions................................ 2-1
Standard Notes for Servicing ................................ 3-1
Cabinet Disassembly Instructions ......................... 4-1
Electrical Adjustment Instructions ......................... 5-1
Block Diagrams ..................................................... 6-1
Schematic Diagrams / CBA’s and Test Points...... 7-1
Schematic Diagrams ............................................. 7-3
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.
CBA Views and Test Points................................. 7-23
Waveforms ............................................................ 8-1
Wiring Diagram...................................................... 9-1
Cabinet Exploded View ....................................... 10-1
Packing Exploded View ....................................... 10-3
Mechanical Parts List .......................................... 11-1
Electrical Parts List.............................................. 12-1
SPECIFICATIONS
<TUNER> ANT. Input ------------------- 75ohm Unbal., F type
Reference Level------------20Vp-p (CRT Green Cathode)
Test Input Signal -----------400Hz 30% modulation
Description Condition Unit Nominal Limit
1. Intermediate Freq. Picture
Sound
2. Color Killer Sens. CH-2
CH-10
CH-55
MHz
MHz
dBµV
dBµV
dBµV
45.75
41.25
15
15
15
-
-
20
20
20
3. AFT Pull In Range
(10mV input)
- MHz ±2.1 ±0.7
<LCD PANEL>
Description Condition Unit Nominal Limit
1. Number of Pixels Horizontal
Vert ical
2. Brightness
3. Response Time - msec 16 -
4. Support Color - - 26mil.(6bit) -
5. Viewing Angle Horizontal
Vert ical
pixels
pixels
cd/m
°
°
640 x 3
480
2
500 -
-80 to 80
-65 to 70
<VIDEO>
Description Condition Unit Nominal Limit
1. Over Scan Horizontal
Vert ical
2. Color Temperature -
x
y
%
%
°K 9200
7
7
0.286
0.294
-
-
-
-
-
±0.3
±0.3
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 4.0/4.0
3. Audio Freq. Response
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 ical
-
3dB: Lch
-
3dB: Rch
1-1 L0305SP
line
line
Hz
Hz
400
350
50 to 12K
50 to 12K
-
-
-
-
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 TV Circuit
1. Before returning an instrument to the custom-
er, always make a safety check of the entire instru-
ment, including, but not limited to, the following
items:
a. Be sure that no built-in protective devices are de-
fective 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 oper-
ate 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 picture tube 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 instru-
ment completely reassembled, plug the AC line
cord directly into a 120V AC outlet. (Do not use an
isolation transformer during this test.) Use a leak-
age 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.
e. X-Radiation and High Voltage Limits - Because
the picture tube is the primary potential source of
X-radiation in solid-state TV receivers, it is specially constructed to prohibit X-radiation emissions.
For continued X-radiation protection, the replacement picture tube must be the same type as the
original. Also, because the picture tube shields
and mounting hardware perform an X-radiation
protection function, they must be correctly in place.
High voltage must be measured each time servic-
CURRENT
TESTER
+
EARTH
GROUND
_
2-1 L6115IMP
ing is performed that involves B+, horizontal deflection or high voltage. Correct operation of the Xradiation protection circuits also must be reconfirmed each time they are serviced. (X-radiation
protection circuits also may be called "horizontal
disable" or "hold down.") Read and apply the high
voltage limits and, if the chassis is so equipped,
the X-radiation protection circuit specifications given on instrument labels and in the Product Safety
& X-Radiation Warning note on the service data
chassis schematic. High voltage is maintained
within specified limits by close tolerance safety-related components/adjustments in the high-voltage
circuit. If high voltage exceeds specified limits,
check each component specified on the chassis
schematic and take corrective action.
2. Read and comply with all caution and safety-related notes on or inside the receiver cabinet, on the
receiver chassis, or on the picture tube.
3. Design Alteration Warning - Do not alter or add
to the mechanical or electrical design of this 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.
4. Picture Tube Implosion Protection Warning -
The picture tube in this receiver employs integral
implosion protection. For continued implosion protection, replace the picture tube only with one of
the same type number. Do not remove, install, or
otherwise handle the picture tube in any manner
without first putting on shatterproof goggles
equipped with side shields. People not so
equipped must be kept safely away while picture
tubes are handled. Keep the picture tube away
from your body. Do not handle the picture tube by
its neck. Some "in-line" picture tubes are equipped
with a permanently attached deflection yoke; because of potential hazard, do not try to remove
such "permanently attached" yokes from the picture tube.
5. Hot Chassis Warning -
a. Some TV receiver chassis are electrically connect-
ed 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.
6. 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.
7. 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.
8. 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 L6115IMP
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 produc-
ing parts (heatsinks, 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 drop-
lets, etc.) do not remain inside the set.
K. Crimp type wire connector
The power transformer uses crimp type connec-
tors which connect the power cord and the primary
side of the transformer. When replacing the trans-
former, 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.
2-3 L6115IMP
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
AC Line Voltage Region
110 to 130 V
Note: This table is unofficial and for reference only. Be
sure to confirm the precise values.
USA or
CANADA
Clearance
Distance (d), (d')
≥ 3.2 mm
(0.126 inches)
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.) is
lower than or equal to the specified value in the table
below.
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.
Z
1.5kΩ
Chassis or Secondary Conductor
Primary Circuit Terminals
dd'
Exposed Accessible Part
AC Voltmeter
0.15µF
Earth Ground
B
Power Cord Plug Prongs
(High Impedance)
Fig. 1
Fig. 2
Table 2 : Leakage current ratings for selected areas
AC Line Voltage Region Load Z Leakage Current (i) Earth Ground (B) to:
0.15µF CAP. & 1.5kΩ
110 to 130 V USA
Note: This table is unofficial and for reference only. Be sure to confirm the precise values.
RES. connected in
parallel
2-4 L6115IMP
i≤0.5mA rms
Exposed accessible
parts
STANDARD NOTES FOR SERVICING
Circuit Board Indications
a. The output pin of the 3 pin Regulator ICs is indicat-
ed as shown.
Top View
Out
b. For other ICs, pin 1 and every fifth pin are indicat-
ed as shown.
Pin 1
c. 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 ma-
chine, 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 ap-
plying 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 twee-
zers. (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 PackIC.
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)
3-1 L14STA
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.
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)
CBA
Masking
Tape
Tweezers
Hot-air
Flat Pack-IC
Desoldering
Machine
Flat Pack-IC
Fig. S-1-2
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)
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 twee-
zers. (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.
Fig. S-1-4
3-2 L14STA
(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 twee-
zers. (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.
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 "I" 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
pre- solder 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.
To Solid
Mounting Point
CBA
Tweezers
Hot Air Blower
Iron Wire
Soldering Iron
Fig. S-1-5
Fine Tip
Soldering Iron
Flat Pack-IC
or
Example :
Pin 1 of the Flat Pack-IC
is indicated by a " " mark.
Presolder
CBA
Fig. S-1-7
Flat Pack-IC
Fig. S-1-6
Fig. S-1-8
3-3 L14STA
Instructions for Handling
Semiconductors
Electrostatic breakdown of the semiconductors 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 (1MΩ) 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 (1MΩ) on the workbench or
other surface, where the semiconductors are to be
placed. Because the static electricity charge on clothing will not escape through the body grounding band,
be careful to avoid contacting semiconductors with
your clothing.
<Incorrect>
<Correct>
1MΩ
CBA
Grounding Band
1MΩ
CBA
Conductive Sheet or
Copper Plate
3-4 L14STA
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.
[7] IR Sensor
CBA
[8] Speaker L
[4] Inverter CBA
[6] Function CBA
[1] Rear Cabinet
[2] Jack Holder
[3] Main CBA
[10] Front
Cabinet
[9] Speaker R
[5] LCD Main CBA
& Liquid Crystal
Panel Unit
2. Disassembly Method
REMOVAL
ID/
LOC.
PA RT
No.
[1] Rear Cabinet
[2] Jack Holder D2 2(S-3), (S-4) ---
[3] Main CBA
[4] Inverter CBA
LCD Main
CBA & Liquid
[5]
Crystal Panel
Unit
[6] Function CBA D2 4(S-8) ---
REMOVE/
*UNHOOK/UNLOCK/
Fig.
No.
RELEASE/UNPLUG/
DESOLDER
D1
11(S-1), (S-2) ---
D3
10(S-5), 2(W-1),
*CN101B, *CN102B,
D2
*CN103B, *CN51,
D3
*CN53, *CN481,
*CN801, *CN802
6(S-6), *CN450,
D2
*CN460, *CN470,
D3
*CN490
13(S-7), *CN310A,
D2
D3
*CN311A, *CN312A
Note
---
---
---
IR Sensor
[7]
CBA
D2 2(S-9) ---
[8] Speaker L D2 2(S-10) --[9] Speaker R D2+ 2(S-11) ---
[10] 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 Desol-
der
2(S-2) = two screws (S-2)
(5): Refer to the following Reference Notes in the
Table.
4-1 L0311DC
(S-1)
(S-1)
(S-1)
(S-2)
[10] Front Cabinet
[1] Rear Cabinet
(S-8)
(S-1)
(S-1)
(S-1)
(S-8)
[6] Function CBA
[5] LCD Main CBA
& Liquid Crystal Panel Unit
(S-1)
(S-1)
Fig. D1
(S-9)
[7] IR Sensor CBA
[8] Speaker L
[9] Speaker R
(S-11)
(S-7)
(S-10)
(S-7)
(W-1)
(S-7)
[4] Inverter CBA
(S-7)
(S-7)
[3] Main CBA
(S-5)
(S-6)
(S-5)
(S-6)
(S-6)
[2] Jack Holder
(S-3)
(S-4)
(S-3)
(S-5)
(S-5)
Fig. D2
4-2 L0311DC
TV Cable Wiring Diagram
To Liquid Crystal Panel
CN311ACN310A
To Liquid Crystal Panel
CN490
CN450
CN481
CN470
CN460
Inverter CBA
CN53
CLN481
CN801
CN51
CN312A
CN101B CN102B CN103B
CN101A CN102A
CN103A
Main CBA
LCD Main
CBA Unit
CN802
CLN53
IR Sensor CBA
To SpeakerTo Speaker
CLN51B
Function CBA
Fig. D3
4-3 L0311DC
ELECTRICAL ADJUSTMENT INSTRUCTIONS
General Note:
"CBA" is abbreviation for "Circuit Board Assembly."
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. NTSC Pattern Generator (Color Bar W/White
Window, Red Color, Dot Pattern, Gray Scale,
Monoscope, Multi-Burst)
3. Remote control unit: Part No. N0105UD or N0127UD
4. Color Analyzer
How to make Service remote control unit:
1.
Prepare normal remote control unit. (Part No.
N0105UD or N0127UD) Remove 3 Screws from the
back lid. (Fig. 1-1)
SCREWS
REMOTE CONTROL UNIT
2. Add J1 (Jumper Wire) to the remote control CBA.
(Fig. 1-2)
J 1
REMOTE CONTROL CBA
Fig. 1-1
Fig. 1-2
How to set up the service mode:
Service mode:
1. Use the service remote control unit.
2. Turn the power on. (Use main power on the TV unit.)
3. Press "SLEEP" button on the service remote control
unit. Version of micro computer will be displayed on
the LCD or display. (Ex: 0004GP-0.47)
1. Initial Setting
General
Enter the Service mode.
Set the each initial data as shown on tabel 1 below.
Table 1: Initial Data
BUTTON
ITEM
BRT
CNT 197
CLR-R 60
CLR-B 60
TNT 60
V-TNT 64
SHR 35
S-BRT
S-CNT 197
S-CLR-R 64
S-CLR-B 64
S-TNT 64
S-SHR 35
C-BRT
C-CNT 197
C-CLR-R 64
C-CLR-B 64
C-TNT 64
C-SHR 35
D2-BRT
D2-CNT 197
D2-CLR-R 64
D2-CLR-B 64
D2-TNT 64
D2-SHR 35
D3-BRT
D3-CNT 197
D3-CLR-R 64
D3-CLR-B 64
D3-TNT 64
D3-SHR 35
(on the service
remote control)
MENU → 1
MENU → 2
MENU → 3
MENU → 5
MENU → 6
DATA
VALUE
167
167
167
167
167
5-1 L0311EA
BUTTON
ITEM
NORMAL
DARK 150
SAIDO
C-SAIDO 188
D2-SAIDO 128
D3-SAIDO 208
H-P
C-H-P 50
V-P
C-V-P 40
COR(C/D1) VOL p → 1512
COG(C/D1) VOL p → 2512
COB(C/D1) VOL p → 3512
DR(C/D1) VOL p → 4138
DG(C/D1) VOL p → 5138
DB(C/D1) VOL p → 6138
COR(C/D2) VOL p → 1512
COG(C/D2) VOL p → 2512
COB(C/D2) VOL p → 3512
DR(C/D2) VOL p → 4138
DG(C/D2) VOL p → 5138
DB(C/D2) VOL p → 6138
7F
LANGUAGE SPA/FRA
STEREO TYPE MTS
ACCESS CODE OFF
BACK LIGHT ON
HD ON
2DVP ES3
HRD ON
NCM ON
ASPECT OFF
(on the service
remote control)
0
5
8
9
VOL p
DATA
VALUE
74
128
50
40
FF
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 +21.0±0.5V DC
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
+21.0±0.5V DC.
VR649
3. Software Reset
To reset software, press “5” button on the remote control unit for at least 5 seconds after pressing “CH
RETURN” button on the remote control unit.
5-2 L0311EA
4. Flicker Adjustment
Adjustment Point: VR201 (LCD Main CBA Unit)
LCD Main CBA Unit
VR201
Note: Use service remote control unit
1. Enter the Service mode. (See page 5-1)
2. Press “2” button on the remote control unit.
The following screen appears.
The following adjustment normally are not
attempted in the field. Only when replacing the
LCD Panel then adjust as a preparation.
5. 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
White
Purity
(APL 80%)
Screen
M. EQ. Spec.
Pattern Generator,
Color analyzer
CH o / p
buttons
Figure
It carries out in a darkroom.
Perpendicularity
VIDEO1
VIDEO2
x (0.256 to 0.316),
y (0.264 to 0.324)
3. If Flicker Adjustment is not fit, the screen become the
following.
FLASH
(Go and Off)
4. Adjust VR201 so that flash stops.
L = 50 cm
INPUT: WHITE 80%
Note: Use service remote control unit
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80%).
3. Set the color analyzer to the CHROMA mode and
bring the optical receptor to the center on the LCDPanel surface after zero point calibration as shown
above.
Note: The optical receptor must be set perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press "VOL p" button on the
service remote control unit and select "C/D" mode.
5-1. When "x" value and "y" value are not within specifica-
tion, adjust "DB(C/D1)" or "DR(C/D1)". Refer to "1.
Initial Setting."
Note: "DB(C/D1)" or "DR(C/D1)" must be adjusted
within ±10.
5-2. When "x" value and "y" value are not within specifica-
tion, adjust "DB(C/D2)" or "DR(C/D2)". Refer to "1.
Initial Setting."
Note: "DB(C/D2)" or "DR(C/D2)" must be adjusted
within ±10.
Color Analyzer
Fig. 2
5-3 L0311EA
BLOCK DIAGRAMS
System Control Block Diagram
D51
STAND BY
P-ON+3.3V
KEY SWITCH
KEY SWITCH
FUNCTION CBA
REMOTE
RCV51
SENSOR
IR SENSOR CBA
CLN51B
KEY-IN-211
KEY-IN-122
CN51
KEY-IN-118 6
KEY-IN-217 7
RCV-IN23 1
CN102B CN102A
CLN53
RCV-IN33
P-ON-H22
CN53
Q51
TO POWER SUPPLY
P-ON-H
PROTECT-2
BACKLIGHT-SW
P-ON-H16 8
PROTECT-2816
CN102B CN102A
BLOCK DIAGRAM
BACKLIGHT-ADJ
BACKLIGHT-SW
BACKLIGHT-ADJ
19 5
21 3
PROTECT-1
TO IF/VIDEO
BLOCK DIAGRAM
SCL
S-SW
INPUT-0
INPUT-1
PROTECT-1915
INPUT-012 12
INPUT-111 13
S-SW717
TO AUDIO
BLOCK DIAGRAM
SDA
SDA
A-MUTE
VOLUME
VOLUME15 9
A-MUTE13 11
SCL618
SDA519
SCL
CN52 IS
USED FOR
BUS-OPEN4
(NO CONNECTION)
SDA2
SCL1
CN52
BUS-OPEN16 8
CN103B CN103A
ADJUSTMENT
AT FACTORY
MAIN CBALCD MAIN CBA UNIT
IC333
(TV MICRO CONTROLLER)
4
KEY-IN-2
3
KEY-IN-1
+3.3V
RESET
IC151
11
RCV-IN
4 5
21
RESET
42
XIN
X161
43
XOUT
27MHz
7
PROTECT-2
22618
P-ON-H
BACKLIGHT-SW
6-1
17
PROTECT-1
BACKLIGHT-ADJ
3140193241
SCL
S-SW
INPUT-0
INPUT-1
SDA
20
35
A-MUTE
VOLUME
23BUS-OPEN
3.3V<-->5V
Q102
+5V
IC171
(MEMORY)
CONVERTER
CN105(NO CONNECTION)
7
6
5
CS
SCL
SDA
SDA 2
SCL 1
BUS-OPEN 4
NO PART
MOUNTED
FOR CN105
L0311BLS
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