FUNAI LT6-B32BB Service Manual

SERVICE MANUAL

This Service Manual is for the
LT6-B32BB(A8CF5BP) model.
For the LT6-B32BB(A8CF5BP)
model, the letter (A8CF5BP) is
printed on the Rating Label on the
back of the unit. Refer to the
Rating Label on the right.

Rating Label

"A8CF5BP"

32″ COLOR LCD TELEVISION

LT6-B32BB

32″ COLOR LCD TELEVISION

LT6-B32BB

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

Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Schematic Diagrams / CBA 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 A8CFASP

SPECIFICATIONS

< TUNER >

VHF/UHF Input ----------- 75Ω unbal., IEC Connector
Center IF ------------------- SECAM-L 38.9MHz, SECAM-L’ 33.9MHz

< LCD PANEL >

<DVB-T>

*1: modulation parameters = [8k 64QAM CR=2/3 GI=1/32]
*2: modulation parameters = [2k 64QAM CR=2/3 GI=1/32]
*3: modulation parameters = [2k 16QAM CR=3/4 GI=1/32]

< VIDEO >

Description Condition Unit Nominal Limit

1. Video S/N 80 dB --- 40

2. Audio S/N --- dB --- 40/40

Description Condition Unit Nominal Limit

1. Number of Pixels

Horizontal

Ver ti ca l

pixels
pixels

1366

768

---

---

2. Viewing Angle

Horizontal

Ver ti ca l

°
°

-88 to 88

-88 to 88

---

---

Description Condition Unit Nominal Limit

1. RECEIVED
FREQ.RANGE
(-60dBm, 45ch.) *1

+

-

kHz
kHz

1000

900

500

-150

2. INPUT DYNAMIC
RANGE (mix./max) *1

VHF HIGH 7ch.
UHF 45ch.

dBm
dBm

-82.5/2

-81.1/2

-75/-10

-75/-10

3. C/N PERFORMANCE

*1

VHF HIGH 7ch.
UHF 45ch.

dB
dB

15
15

≦18
≦18

4. MULTIPATH

a. Performance with

short delay echoes

b. Performance with

long delay echoes

c. C/N Performance on

0dB echo channel
(14µs)

UHF 45ch.

c:*2
d:*3
c:*2
d:*3
c:*1

dB
dB
dB
dB
dB

18.7

14.0

19.1

13.0

20.7

≦23
≦20
≦23
≦18
≦24

Description Condition Unit Nominal Limit

1. Over Scan

Horizontal

Vert i cal

%
%

5
5

±5
±5

2. Color Temperature

AT 70% WHITE FIELD

x
y

°K 12000

0.272

0.278

--­±0.005
±0.005

3. Resolution

Horizontal

Vert i cal

line
line

400
350

---

---

4. Brightness AT 100% WHITE FIELD cd/m

2

300 ---

1-2 A8CFASP

< AUDIO >

All items are measured across 16 Ω load at speaker output terminal.

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. 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 8 k
70 to 8 k

---

---

4. Audio S/N

VIDEO1
VIDEO2

dB
dB

---

---

>45/45
>45/45

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 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

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 be­tween B (earth ground, power cord plug prongs) and
externally exposed accessible parts (RF terminals, an­tenna terminals, video and audio input and output ter­minals, microphone jacks, earphone jacks, etc.).

Measuring Method : (Power ON)

Insert load Z between B (earth ground, power cord
plug prongs) and exposed accessible parts. Use an
AC voltmeter to measure across both terminals of load
Z. See Fig. 2 and following table.

Table 2: Leakage current ratings for selected areas

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)
≥ 8mm(d’)

Fig. 1

Chassis or Secondary Conductor

Primary Circuit

d' d

Fig. 2

AC Voltmeter
(High Impedance)

Exposed Accessible Part

B

One 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

50kΩ RES.

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 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.

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 A8CF5DC

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.
N = Nut, 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]

Stand Base
Plate

D1 4(S-1), 3(S-2), 4(S-3) ---

[2]

Stand
Cover

D1 --------------- ---

[3]

Stand
Hinge

D1 --------------- ---

[4]

Rear
Cabinet

D1 12(S-4), (S-5), 2(S-6) ---

[5] FFC Shield D2 2(S-7) ---

[6] Shield Box

D2
D4

2(S-8), 7(S-9),
4(S-10), *CN3601,
*CN3701, *CN3704,
*CN4501, *CN4502,
*CN4503

---

[7]

Digital Main
CBA UnitD2D4

2(S-11), Connector IC
Card OSU

---

[8] Shield (T) D2 (S-12) ---

[2] Stand Cover

[13] Junction-A
CBA

[16] Speaker
Holder (L,R)

[17] Speaker(s)

[3] Stand Hinge

[15] Function CBA

[10] Junction-B
CBA

[7] Digital Main
CBA Unit

[1] Stand Base
Plate

[4] Rear Cabinet

[5] FFC Shield

[6] Shield Box

[14] IR Sensor
CBA

[11] Inverter CBA

[12] LCD Module
Assembly

[18] Front Cabinet

[9] Power Supply
CBA

[8] Shield (T)

[9]

Power
Supply
CBA

D2
D4

9(S-13), *CN102,
*CN801, *CN802,
*CN1000, *CN1901

---

[10]

Junction-B
CBA

D2
D4

*CN803B ---

[11]

Inverter
CBA

D3
D4

9(S-14), *CN1050,
*CN1100, *CN1150,
*CN1200, *CN1250

---

[12]

LCD
Module
Assembly

D3 4(S-15) ---

[13]

Junction-A
CBA

D3
D4

*CL101B ---

[14]

IR Sensor
CBA

D3
D4

2(S-16), *CL102A ---

[15]

Function
CBA

D3
D4

2(S-17) ---

[16]

Speaker
Holder
(L,R)

D3 4(S-18) ---

[17] Speaker(s) D3 --------------- ---

[18]

Front
Cabinet

D3 --------------- ---

↓

(1)

↓

(2)

↓

(3)

↓

(4)

↓

(5)

Step/

Loc.

No.

Part

Removal

Fig.

No.

Remove/*Unhook/

Unlock/Release/

Unplug/Unclamp/

Desolder

Note

4-2 A8CF5DC

[4] Rear Cabinet

[2] Stand Cover

[3] Stand Hinge

[1] Stand Base Plate

(S-2)

(S-4)

(S-4)

(S-6)

(S-4)

(S-5)

(S-3)

(S-4)

(S-1)

(S-4)

(S-3)

(S-6)

Fig. D1

4-3 A8CF5DC

[6] Shield Box

[8] Shield (T)

[5] FFC Shield

[7] Digital Main CBA Unit

(S-13)

(S-14)

(S-12)

(S-7)

(S-14)

(S-14)

[9] Power Supply CBA

[10] Junction-B CBA

(S-10)

(S-11)

(S-9)

(S-10)

(S-9)

(S-8)

Connector IC Card OSU

Fig. D2

4-4 A8CF5DC

[12] LCD Module Assembly

[14] IR Sensor
CBA

[15] Function
CBA

[17] Speaker

[16] Speaker
Holder (L,R)

[16] Speaker
Holder (L,R)

[18] Front Cabinet

(S-16)

(S-14)

(S-14)

(S-14)

(S-18)

(S-18)

(S-17)

(S-15)

[13] Junction-A
CBA

(S-18)

(S-18)

[17] Speaker

[11] Inverter CBA

Fig. D3

4-5 A8CF5DC

TV Cable Wiring Diagram

CN104A CN101A CN102A CN103A

CN3601 CN3701 CN4503

CN4501 CN4502

CN3704

CN1000

CN803A

AC CORD

Function CBA

Power Supply
CBA

Digital Main
CBA Unit

CLN400

CN801

CN1050

CN1100

CN1150

CN1200

CN1250

CN1901

Inverter CBA

CL102B

To LCD
Module
Assembly

IR Sensor CBA

Junction-A
CBA

CN802

CN102

To Speaker

CL102A

CL101A

CN101
CL101B

Junction-B
CBA

CN804 CN803B

To LCD Module
Assembly

Fig. D4

5-1 A8CFAEA

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. Pattern Generato

3. Color Analyzer

How to make the Service remote
control unit:

Cut “A” portion of the attached remote control unit as
shown in 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.

Fig. 1

A

service button

5-2 A8CFAEA

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.

2. VCOM Adjustment.

1. Operate the unit for more than 20 minutes.

2. Set the color analyzer 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.

3. Enter the Service mode.

4. [VCOM1]
Press [2] button on the service remote control unit.

[VCOM2]

Press [3] button on the service remote control unit.

5. Press [P / ] buttons on the service remote
control unit so that the color analyzer value
becomes minimum.

[7] button

Note:

When entering this mode, the default setting is White mode.

Purity Check Mode

[7] button

Red mode

Green mode

Blue mode

Black mode

[7] button

White mode

[7] button

[7] button

White 25% mode

[7] button

Test Point

Adj. Point

Screen

[P / ]

buttons

M. EQ. Spec.

Color analyzer

See below

Figure

Color Analyzer

It carries out in a darkroom.

L = 3 cm

Perpendicularity

5-3 A8CFAEA

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 Raster(70%=70IRE, 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.

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 12000°K (x

=

0.272 / y

=

0.278 ±0.005).

Tes t Po int

Adj. Point Mode Input

Screen

[P / ]

buttons

[VIDEO]

C/D

White Raster

(APL 70%)

or

(APL 30%)

M. EQ. Spec.

Pattern Generator,

Color analyzer

x= 0.272 ± 0.005
y= 0.278 ± 0.005

Figure

Color Analyzer

It carries out in a darkroom.

L = 3 cm

Perpendicularity

INPUT: WHITE 70%, 30%

30%=30IRE

70%=70IRE

INPUT SIGNAL

6-1 A8CF0INT

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.

7-1

System Control Block Diagram

A8CF5BLS

BLOCK DIAGRAMS

LED1

KEY SWITCH

IC4700

(SUB MICRO CONTROLLER)

IC4513

(MAIN MICRO CONTROLLER)

XOUT

XIN

X3101

4MHz

OSC

DIGITAL MAIN CBA UNIT

POWER SUPPLY CBA

IR SENSOR CBA

FUNCTION CBAPOWER SUPPLY CBA

CL101A

REMOTE

SENSOR

RCV101

+3.3V

D102

POWER

STANDBY

D101

LED144

CL101B

REMOTE22

P-ON-H155

CN104ACN3601

REMOTE22 4

CN4503CN102A

CN803B CN804

11332

2

PROTECT3 1

BACKLIGHT-ADJ3BACKLIGHT-SW

PROTECT3

BACKLIGHT-ADJ

BACKLIGHT-SW

2

CN803A

JUNCTION-B CBA

REMOTE

11

12

RXD

15

6

8

CLKOUT

CLKIN

X3301

25MHz

OSC

U25

U26

SCL

SDA

45

44

IC200

(VIDEO/AUDIO SELECTOR)

P-ON-H1

TO

INVERTER

BLOCK

DIAGRAM

(CN1000)

BACKLIGHT-ADJ

AC24

BACKLIGHT-SW

A2

TXD1

P22

TO DIGITAL

SIGNAL

PROCESS

BLOCK

DIAGRAM

TO POWER

SUPPLY

BLOCK

DIAGRAM

PROTECT1

22

P-ON-H1

14

P-ON-H2

13

P-ON-H2

P-ON-H2

P-ON-H1125

TXD

16

RXD1

N22

AMP-MUTE-SUB

18

REMOTE

R22

RESET-MAIN

5

RESET-MAIN

V24

TO AUDIO-2

BLOCK

DIAGRAM

JUNCTION-A

CBA

LED134

REMOTE52

P-ON-H125

CN101

KEY-IN166KEY-IN116

CL102A

KEY-IN111

CL102B

CN102

LED118 8

CN101A

P-ON-H213 13

CN3701

KEY-IN125 1

KEY-IN1

24

VCOM-PWM

21

VCOM-PWM

AA2

AMP-MUTE-MAIN

AMP-MUTE

SCL

SDA

19

20

IC3102 (MEMORY)

5

6

SDA

SCL

PROTECT223PROTECT3

4

PROTECT1

21 5

RESET

17 9

CN101ACN3701

PROTECT2

20 6

PROTECT3

19 7

RESET

3

IC3706 (MEMORY)

SPI-CLK

SPI-DO

SPI-DI

SPI-CS

SCK

SI

SO

CS

Y25

Y24

W25

W24

652

1

Q3828

AF12

AE12

SCL

SDA

Q3827

BUFFER

BUFFER

TO AUDIO-1

BLOCK

DIAGRAM

SCL

SDA

NICAM-RESET

B11

NICAM-RESET

C12

S-SW

SCL

SDA

TO VIDEO

BLOCK

DIAGRAM

TO VIDEO

BLOCK

DIAGRAM

SCL18 8

SDA20 6

24223

3

BACKLIGHT-ADJ

BACKLIGHT-SW

CN104ACN3601

PROTECT1

RESET

PROTECT2

TO POWER

SUPPLY

BLOCK

DIAGRAM

POWER SUPPLY CBA

INPUT2

D12

INPUT2

INPUT2

S-SW

Q3822

TO AUDIO-2

BLOCK

DIAGRAM