Funai LH8-M26BB Schematic
SERVICE MANUAL
This Service Manual is for the
LH8-M26BB (A03A0EP) / LT8-M26BB (A03A1EP) model.
For the LH8-M26BB (A03A0EP) / LT8-M26BB (A03A1EP) model, the letter
(A03A0EP) / (A03A1EP) is printed on the Serial Number Label on the back
of the unit. Refer to the Serial Number Label below.
Serial No. Label Serial No. Label
"A03A0EP" "A03A1EP"
26″ COLOR LCD TELEVISION
LH8-M26BB / LT8-M26BB
26″ COLOR LCD TELEVISION
LH8-M26BB / LT8-M26BB
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
How to Initialize the LCD Television. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1
Schematic Diagrams / CBA and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-1
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-1
Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-1
Mechanical Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-1
Electrical Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-1
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.
SPECIFICATIONS
< TUNER >
VHS/UHF Input ----------- 75Ω unbal., IEC Connector
Center IF ------------------- SECAM-L 38.9MHz, SECAM-L’ 33.9MHz
Description Condition Unit Nominal Limit
1. Video S/N 80 dB --- 40
2. Audio S/N --- dB --- 40/40
< LCD PANEL >
Description Condition Unit Nominal Limit
1. Number of Pixels
2. Viewing Angle
<DVB-T>
Description Condition Unit Nominal Limit
1.
RECEIVED FREQ.RANGE
(-60dBm, 45ch.) *1, *2
2. INPUT DYNAMIC
RANGE (mix./max)
3. C/N PERFORMANCE
(-50dBm)
4. MULTIPATH (-50dBm)
a. Performance with
short delay echoes
b. Performance with
long delay echoes
Horizontal
Ver t i cal
Horizontal
Ver t i cal
+
-
c:*1 VHF HIGH 8ch.
UHF 45ch.
d:*2 VHF HIGH 8ch.
UHF 45ch.
c:*1 VHF HIGH 8ch.
UHF 45ch.
d:*2 VHF HIGH 8ch.
UHF 45ch.
UHF 45ch.
c:*3
d:*4
c:*3
d:*4
pixels
pixels
kHz
kHz
dBuV
dBuV
dBuV
dBuV
dB
dB
dB
dB
dB
dB
dB
dB
1366
768
°
°
-88 to 88
-88 to 88
1000
900
25/101
25/101
18/101
18/101
15
15
11
11
18.7
14.0
19.1
13.0
---
---
---
---
500
167
28/98
29/98
21/98
21/98
≦18
≦18
≦14
≦14
≦23
≦20
≦23
≦18
*1: modulation parameters = [8k 64QAM CR=2/3 GI=1/32]
*2: modulation parameters = [8k 16QAM CR=3/4 GI=1/8]
*3: modulation parameters = [2k 64QAM CR=2/3 GI=1/32]
*4: modulation parameters = [2k 16QAM CR=3/4 GI=1/32]
< VIDEO >
Description Condition Unit Nominal Limit
1. Over Scan
2. Color Temperature
3. Resolution
4. Brightness AT 100% WHITE FIELD cd/m
Horizontal
Ver t i cal
AT 70% WHITE FIELD
x
y
Horizontal
Ver t i cal
1-1 A03A0SP
line
line
%
%
°K 9200
2
5
5
0.286
0.295
400
350
300 ---
---
---
--±0.008
±0.008
---
---
< AUDIO >
All items are measured across 16 Ω load at speaker output terminal.
Description Condition Unit Nominal Limit
1. Audio Output Power 10% THD: Lch/Rch W 5.0/5.0 4.0/4.0
2. Audio Distortion 500mW: Lch/Rch % 1.5/1.5 3.0/3.0
-
3. Audio Freq. Response
6dB: Lch
-
6dB: Rch
Hz
Hz
70 to 10 k
70 to 10 k
---
---
4. Audio S/N Lch/Rch dB ---
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.
≧45/45
1-2 A03A0SP
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
1.0 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.
2-2 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. 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.
2-3 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
AC Line Voltage Clearance Distance (d), (d’)
220 to 240 V
Note: This table is unofficial and for reference only.
Be sure to confirm the precise values.
≥ 3mm(d)
≥ 8mm(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.).
Chassis or Secondary Conductor
Primary Circuit
d' d
Exposed Accessible Part
Z
AC Voltmeter
(High Impedance)
Fig. 1
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
AC Line Voltage Load Z Leakage Current (i)
2kΩ RES.
Connected in
parallel
220 to 240 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
One side of
B
Power Cord Plug Prongs
One side of power cord plug
prongs (B) to:
Antenna terminals
A/V Input, Output
Fig. 2
RF or
2-4 LTVP_ISP
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 “ I ” mark on the flat pack-IC indicates pin 1.
(See Fig. S-1-7.) Be sure this mark matches the
pin 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
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] Stand
Assembly
[15] Junction
CBA
[3] Jack
Holder(HP)
[4] Jack CBA
[2] Rear Cabinet
[6] Tuner Shield
[7] Power Supply
CBA
[8] Jack Holder
[9] Shield Box
[10] Digital Main
CBA Unit
[11] PCB Holder
[12] Stand Holder
[17] LCD Module
Assembly
[18] Front
Cabinet
[13] Speaker
Holder(s) [L,R]
[14] Speaker(s)
[5] Inverter
Power CBA
[16] Function
CBA
2. Disassembly Method
Removal
Step/
Loc.
Part
No.
Stand
[1]
Assembly
Rear
[2]
Cabinet
Jack Holder
[3]
(HP)
[4] Jack CBA
Inverter
[5]
Power CBAD2D6
Tuner
[6]
Shield
Remove/*Unhook/
Fig.
No.
Unlock/Release/
Unplug/Unclamp/
Note
Desolder
D1 4(S-1) ---
D1 11(S-2), 3(S-3), (S-4) ---
D2 (S-5) ---
D2
2(S-6), *CL202B ---
D6
4(S-7), *CN1900,
*CN1951, *CN1952
D3 2(S-8) ---
---
Removal
Step/
Loc.
No.
Part
Fig.
Remove/*Unhook/
Unlock/Release/
No.
Unplug/Unclamp/
Note
Desolder
6(S-9), *CN101,
D3
*CN401, *CN402,
D6
*CN403, *CN404,
*CN801, *CN802
---
[7]
Power
Supply
CBA
[8] Jack Holder D3 2(S-10) ---
[9] Shield Box D3
Digital Main
[10]
CBA UnitD3D6
9(S-11), 2(S-12),
2(H-1), *CN3903
---
--------------- ---
[11] PCB Holder D4 6(S-13) ---
Stand
[12]
Holder
D4 2(S-14) ---
Speaker
[13]
Holder(s)
D5 8(S-15), Hook ---
[L,R]
[14] Speaker(s) D5 --------------- ---
[15]
[16]
Junction
CBA
Function
CBA
D5
*CL104B ---
D6
D5
3(S-16) ---
D6
LCD
[17]
Module
D5 2(S-17), 6(S-18) ---
Assembly
Front
[18]
↓
(1)
Cabinet
↓
(2)
D5 --------------- ---
↓
(3)
↓
(4)
(5)
↓
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.
N = Nut, L = Locking Tab, S = Screw,
H = Hex 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 bl e ."
4-1 A03A0DC
[2] Rear Cabinet
[1] Stand Assembly
(S-2)
(S-2)
(S-4)
(S-3)
(S-2)
(S-1)
Fig. D1
4-2 A03A0DC
[5] Inverter Power CBA
[3] Jack Holder(HP)
(S-5)
(S-6)
[4] Jack CBA
(S-7)
(S-9)
(S-11)
(S-11)
(S-7)
[10] Digital Main
CBA Unit
(S-11)
Fig. D2
[8] Jack Holder
(S-10)
(S-11)
(H-1)
(S-12)
[9] Shield Box
(S-11)
(S-8)
(S-9)
[7] Power Supply CBA
4-3 A03A0DC
(S-9)
[6] Tuner Shield
Fig. D3
(S-14)
[11] PCB Holder
[18] Front Cabinet
[12] Stand Holder
(S-17)
(S-13)
Fig. D4
[17] LCD Module
Assembly
(S-18)
[14] Speaker
(S-15)
Hook
(S-18)
[13] Speaker Holder [L]
Hook
(S-18)
[13] Speaker
Holder [R]
(S-18)
[15] Junction CBA
(S-16)
(S-15)
[16] Function CBA
[14] Speaker
Fig. D5
4-4 A03A0DC
3. TV Cable Wiring Diagram
To LCD
Module
Assembly
To LCD Module
Assembly
Inverter Power CBA
CN1952
CN1951
CN1900
Power Supply CBA
CN453
CN610
CN801
CN101
AC CORD
CN402
CN404
CN403
CN401
CN802
To SpeakerTo Speaker
CL202B
CN3903
CN3701
CN3702
CN3703
CN3704
Digital Main
CBA Unit
Jack CBA
CL201A
Function CBA
CL104B
CL104A
Junction
CBA
CN105
Fig. D6
4-5 A03A0DC
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. Pattern Generato
2. Color Analyzer
3. Servic Remote control unit
How to make the Service remote
control unit:
Cut “A” portion of the attached remote control unit as
shown in Fig. 1.
service button
1. Purity Check Mode
This mode cycles through full-screen displays of red,
green, blue, and white to check for non-active pixels.
1. Enter the Service mode.
2. Each time pressing [7] button on the service
remote control unit, the display changes as
follows.
Purity Check Mode
White mode
[7] button
[7] button
Black mode
A
Fig. 1
How to set up the service mode:
Service mode:
1. Use the service remote control unit.
2. Turn the power on.
3. Press the service button on the service remote
control unit as shown in Fig.1.
[7] button
Red mode
[7] button
Green mode
[7] button
Blue mode
[7] button
White 20% mode
Note:
When entering this mode, the default setting is White mode.
3. To cancel or to exit from the Purity Cheak Mode,
press [BACK] button.
5-1 A03A0EA
2. Auto Calibration [Component]
3. Auto Calibration [PC]
Purpose: To bring the color adjustment of each
component into standard alignment.
Symptom of Misadjustment: If this adjustment is
incorrect, component signals do not reproduce the
corresponding color.
1. Input 720P 100% Color Bar signal.
2. Enter the service mode.
3. To enter the Auto Calibration adjustment mode,
press [6] button on the service remote control unit.
4. To start auto adjustment, press [P ] button on the
service remote control unit.
- In the auto adjustment mode, “Calibration Check”
appears on the screen.
- Upon completion, “OK” appears on the screen.
5. To cancel or to exit from the Auto Calibration
[Component], press [BACK] button.
Purpose: To bring the color adjustment of PC into
standard alignment.
Symptom of Misadjustment: If this adjustment is
incorrect, PC signals do not reproduce the
corresponding color.
1. Input SVGA 100% White signal.
2. Enter the service mode.
3. To enter the Auto Calibration adjustment mode,
press [5] button on the service remote control unit.
4. To start auto adjustment, press [P ] button on the
service remote control unit.
- In the auto adjustment mode, “Calibration Check”
appears on the screen.
- Upon completion, “OK” appears on the screen.
5. To cancel or to exit from the Auto Calibration [PC],
press [BACK] button.
5-2 A03A0EA
The White Balance Adjustment should be
performed when replacing the LCD Panel
or Digital CBA.
4. White Balance Adjustment
[Video/Component/PC]
Purpose: To mix red, green and blue beams correctly
for pure white.
Symptom of Misadjustment: White becomes bluish
or reddish.
Test Point
Screen
Pattern Generator,
Color analyzer
Adj. Point Mode Input
[P / ]
buttons
M. EQ. Spec.
[VIDEO]
C/D
x= 0.286 ± 0.005
y= 0.295 ± 0.005
Figure
White Raster
(APL 70%)
or
(APL 30%)
4. Enter the Service mode. Press [ -] button on the
service remote control unit and select “C/D” mode.
5. [CUTOFF]
Press [3] button to select “COB” for Blue Cutoff
adjustment. Press [1] button to select “COR” for
Red Cutoff adjustment.
[DRIVE]
Press [6] button to select “DB” for Blue Drive
adjustment. Press [4] button to select “DR” for Red
Drive adjustment.
6. In each color mode, press [P / ] buttons to
adjust the values of color.
7. Adjust Cutoff and Drive so that the color
temperature becomes 9200°K (x
±0.005).
8. Change the video signal input in step 2 and repeat
from step 3.
9. To cancel or to exit from the White Balance
Adjustment, press [BACK] button.
=
0.286 / y= 0.295
To avoid interference from ambinent
light, this adjustment should be
performed in a dark room.
Perpendicularity
L = 3 cm
INPUT: WHITE 70%, 30%
1. Operate the unit for more than 20 minutes.
2. [VIDEO input]
Input the White Raster (70%=70IRE,
30%=30IRE).
[Component input]
Input the 720P White Raster (70%=70IRE,
30%=30IRE).
[PC input]
Input the SVGA White Raster (70%=70IRE,
30%=30IRE).
INPUT SIGNAL
Color Analyzer
30%=30IRE
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.
70%=70IRE
5-3 A03A0EA
HOW TO INITIALIZE THE LCD TELEVISION
How to initialize the LCD television:
1. Turn the power on.
2. To enter the service mode, press the service
button on the service remote control unit. (Refer to
page 5-1.)
- To cancel the service mode, Press [ ] button on
the remote control unit.
3. Press [ ] button on the service remote control
unit to initialize the LCD television.
4. "INITIALIZED" will appear in the upper right of the
screen. "INITIALIZED" color will change to green
from red when initializing is complete.
6-1 A03A0INT
FLOW CHART NO.1
The power cannot be turned on.
TROUBLESHOOTING
Is the fuse (F601) normal?
Ye s
Is normal state restored when once unplugged power
cord is plugged again several seconds?
Ye s
Is approximately 15V voltage supplied to the cathode
of D504?
Ye s
Check each rectifying circuit of the secondary circuit
and service it if defective.
FLOW CHART NO.2
The fuse blows out.
Check the presence that the primary component is
leaking or shorted and service it if defective.
No
No
No
See FLOW CHART No.2 <The fuse blows out.>
Check if there is any leak or short-circuiting on the
primary circuit component, and service it if defective.
(IC607, IC621, Q621, Q622, Q623, D609, D610,
D611, D612, T601, T602)
Check the presence that the rectifying diode or circuit
is shorted in each rectifying circuit of secondary side,
and service it if defective.
After servicing, replace the fuse (F601).
FLOW CHART NO.3
When the output voltage fluctuates.
Does the photocoupler circuit on the secondary side
operate normally?
Ye s
Check IC607, IC621, D625, D628, D630, D631, D634,
D635, D636, D638 and their periphery, and service it
if defective.
FLOW CHART NO.4
When buzz sound can be heard in the vicinity of power circuit.
Check if there is any short-circuit on the rectifying diode and the circuit in each rectifying circuit of the secondary side, and
service it if defective. (D504, D511, D514, D523, D524, D525, D539, Q501, Q
No
Check IC607, Q512, Q513, D505, D530 and their
periphery, and service it if defective.
510, Q517, Q518, Q521)
7-1 A01A0TR
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