JVC LT-32A200, LT-32A200/AK Service Manual

SERVICE MANUAL

YA712<Rev.002>20097SERVICE MANUAL

LCD TELEVISION

LT-32A200/AK

HIGH DEFINITION TELEVISION

There may be multiple versions of
this TV model.
The TV version is identified by the
letters next to the model number
on the TV's Rating.
(See illustration).
Use the service manual that
matches the version of the TV.

COPYRIGHT © 2009 Victor Company of Japan, Limited

MODEL NAME

LT-32A200

MODEL NO.

RATING LABEL (REAR)

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15

VERSION

AK

COPYRIGHT © 2009 Victor Company of Japan, Limited

No.YA712<Rev.002>

2009/8

SPECIFICATION

Items Contents

Dimensions ( W × H × D ) 76.0 cm × 56.3 cm × 23.4 cm (30.0" × 22.2" × 9.3") [with stand]

76.0 cm × 51.93 cm × 11.35 cm (30.0" × 20.5" × 4.5") [without stand]

Mass 9.3 kg (20.6 lbs) [with stand]

Power Input AC120 V , 60 Hz

Power Consumption 155 W (Max)

TV RF System
(Analog / Digital)

Color System (Analog) NTSC

Stereo System (Analog) BTSC (Multi Channel Sound)

Teletext System (Analog) Closed caption (T1-T4 / CC1-CC4)

TV Receiving Channels
and Frequency (Analog)

TV / CATV Total Channel 191 Channels

Intermediate Frequency
(Analog)

Color Sub Carrier Frequency (Analog) 3.58 MHz

LCD Panel 32" class (31.5" Diagonal) wide aspect (16 : 9)
Display Pixels Horizontal : 1366 dots × Vertical : 768 dots (W-XGA)

Audio Power Output 10 W + 10 W
Speaker 1.61" × 2.79", oval type × 2

Antenna Terminal
(VHF/UHF, ATSC / DIGITAL CABLE IN)

Video / Audio Input
[VIDEO]

Video / Audio Input
[COMPONENT]

Digital Input Digital(Video/Audio) HDMI 2-row 19pin connector × 3

Audio output 500mV(rms) (-4dBs), Low impedance, RCA pin jack × 2
Digital Audio output 500 mV (rms), Coaxial × 1
Remote Control Unit RM-C2150 (AA/R6 battery × 2)

Component Video

VHF Low

VHF High

Video IF

Sound IF

S-Video Mini-DIN 4 pin × 1

1080i / 720p

480p / 480i

Analog (Audio) 500mV(rms) (-4dBs), high impedance, RCA pin jack × 2

Design & specifications are subject to change without notice.

8.8 kg (19.5 lbs) [without stand]

Analog

CCIR (M)

Digital

ATSC terrestrial / Digital cable

02 ch - 06 ch : 54 MHz - 88 MHz
07 ch - 13 ch : 174 MHz - 216 MHz

UHF

14 ch - 69 ch : 470 MHz - 806 MHz

CATV

54 MHz - 804 MHz
Low Band : 02 - 06
High Band : 07 - 13
Mid Band : 14 - 22
Super Band : 23 - 36
Hyper Band : 37 - 64
Ultra Band : 65 - 94, 100 - 135
Sub Mid Band : 01, 96 - 99

45.75 MHz

41.25 MHz (4.5 MHz)

F-type connector, 75Ω unbalanced, coaxial × 1

Y: 1 V (p-p), Positive (Negative sync.), 75 Ω

C: 0.286V (p-p) (Burst signal), 75 Ω
Video 1 V (p-p), Positive (Negative sync.), 75 Ω, RCA pin jack × 1
Audio 500 mV (rms), High impedance, RCA pin jack × 2

RCA pin jack × 3

Y : 1 V (p-p) (Sync signal: 0.35V(p-p), 3-value sync.), 75 Ω

Pb/Pr : ±0.35V(p-p), 75 Ω

Y : 1 V (p-p), Positive (Negative sync.), 75 Ω

Cb/Cr : 0.7V(p-p), 75 Ω
Audio 500 mV (rms), High impedance, RCA pin jack × 2

(Digital-input terminal is not compatible with picture signals of personal computer)

Video: Supported format: 1080i / 720p / 480p / 480i

Audio: 2ch L-PCM, 32 / 44.1 / 48 KHz, 16 / 20 / 24 bit

1-2 (No.YA712<Rev.002>)

SECTION 1

PRECAUTION

1.1 SAFETY PRECAUTIONS

(1) The design of this product contains special hardware,

many circuits and components specially for safety
purposes. For continued protection, no changes should be
made to the original design unless authorized in writing by
the manufacturer. Replacement parts must be identical to
those used in the original circuits. Service should be
performed by qualified personnel only.

(2) Alterations of the design or circuitry of the products should

not be made. Any design alterations or additions will void
the manufacturer's warranty and will further relieve the
manufacturer of responsibility for personal injury or
property damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These
characteristics are often not evident from visual inspection
nor can the protection afforded by them necessarily be
obtained by using replacement components rated for
higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in
the parts list of Service manual. Electrical components

having such features are identified by shading on the
schematics and by ( ) on the parts list in Service
manual. The use of a substitute replacement which does

not have the same safety characteristics as the
recommended replacement part shown in the parts list of
Service manual may cause shock, fire, or other hazards.

(4) Don't short between the LIVE side ground and

ISOLATED (NEUTRAL) side ground or EARTH side
ground when repairing.

Some model's power circuit is partly different in the GND.
The difference of the GND is shown by the LIVE : ( ) side
GND, the ISOLATED (NEUTRAL) : ( ) side GND and
EARTH : ( ) side GND.
Don't short between the LIVE side GND and ISOLATED
(NEUTRAL) side GND or EARTH side GND and never
measure the LIVE side GND and ISOLATED (NEUTRAL)
side GND or EARTH side GND at the same time with a
measuring apparatus (oscilloscope etc.). If above note will
not be kept, a fuse or any parts will be broken.

(5) When service is required, observe the original lead dress.

Extra precaution should be given to assure correct lead
dress in the high voltage circuit area. Where a short circuit
has occurred, those components that indicate evidence of
overheating should be replaced. Always use the
manufacturer's replacement components.

(6) Isolation Check (Safety for Electrical Shock Hazard)

After re-assembling the product, always perform an
isolation check on the exposed metal parts of the cabinet
(antenna terminals, video/audio input and output terminals,
Control knobs, metal cabinet, screw heads, earphone jack,
control shafts, etc.) to be sure the product is safe to operate
without danger of electrical shock.

a) Dielectric Strength Test

The isolation between the AC primary circuit and all metal
parts exposed to the user, particularly any exposed metal
part having a return path to the chassis should withstand a
voltage of 3000V AC (r.m.s.) for a period of one second. (.
. . . Withstand a voltage of 1100V AC (r.m.s.) to an
appliance rated up to 120V, and 3000V AC (r.m.s.) to an
appliance rated 200V or more, for a period of one second.)
This method of test requires a test equipment not generally
found in the service trade.

b) Leakage Current Check

Plug the AC line cord directly into the AC outlet (do not use
a line isolation transformer during this check.). Using a
"Leakage Current Tester", measure the leakage current
from each exposed metal part of the cabinet, particularly
any exposed metal part having a return path to the chassis,
to a known good earth ground (water pipe, etc.). Any
leakage current must not exceed 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).

Alternate Check Method

Plug the AC line cord directly into the AC outlet (do not
use a line isolation transformer during this check.). Use

an AC voltmeter having 1000Ω per volt or more
sensitivity in the following manner. Connect a 1500Ω
10W resistor paralleled by a 0.15µF AC-type capacitor

between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part,
particularly any exposed metal part having a return path
to the chassis, and measure the AC voltage across the
resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Any voltage measured must
not exceed 0.75V AC (r.m.s.). This corresponds to

0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC
(r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER
(HAVING 1000 /V,
OR MORE SENSITIVITY)

0.15 F AC-TYPE

GOOD EARTH GROUND

1500 10W

PLACE THIS PROBE
ON EACH EXPOSED
ME TAL PAR T

(No.YA712<Rev.002>)1-3

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 HOW TO IDENTIFY THE TRANS INVERTER

When you replace one of the below Trans Inverters on INVERT­ER PWB, please replace with the one that has same parts num­ber.
For the part FU-LTZ3PZDAR007, in addition to the lot number,
the letter “DARFON 7609A” is printed on the bottom of the part.
For the part FU-LTZ3PZ0XB009, in addition to the lot number,
the letter ”3PZ0XB009 JS HVT-153” is printed on the bottom of
the part.
Do not mix different parts number’s Trans Inverter.

Part No.: FU-LTZ3PZDAR007

“

DARFON 7609A”

Lot No. Stamp

2.2 STANDARD NOTES FOR SERVICING

2.2.1 CIRCUIT BOARD INDICATIONS

(1) The output pin of the 3 pin Regulator ICs is indicated as

shown.

Part No.: FU-LTZ3PZ0XB009

“

3PZ0XB009 JS HVT-153”

Lot No. Stamp

2.2.2 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

Top View

Bottom View

Input

Out

(2) For other ICs, pin 1 and every fifth pin are indicated as

shown.

In

5

Pin 1

10

(3) The 1st pin of every male connector is indicated as shown.

Pin 1

1-4 (No.YA712<Rev.002>)

2.2.3 HOW TO REMOVE / INSTALL FLAT PACK-IC

2.2.3.1 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.2-1)

Fig.2-1

(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 PWB;

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.2-6)

(4) Release the flat pack-IC from the PWB using tweezers.

(Fig.2-6)

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.2-2)

(3) The flat pack-IC on the PWB 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.2-3)

Flat Pack-IC

Desoldering Braid

Soldering Iron

Fig.2-3

(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.2-4)

Sharp
Pin

Fine Tip
Soldering Iron

Fig.2-4

(3) Bottom of the flat pack-IC is fixed with glue to the PWB;

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.2-6)

(4) Release the flat pack-IC from the PWB using tweezers.

(Fig.2-6)

CBA

Masking
Tape

Tweezers

Fig.2-2

Hot-air
Flat Pack-IC
Desoldering
Machine

Flat Pack-IC

(No.YA712<Rev.002>)1-5

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.2-3)

(2) Affix the wire to a workbench or solid mounting point, as

shown in Fig.2-5.

(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 PWB contact pads as shown
in Fig.2-5.

(4) Bottom of the flat pack-IC is fixed with glue to the PWB;

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.2-6)

(5) Release the flat pack-IC from the PWB using tweezers.

(Fig.2-6)

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 PWB, handle it gently because
it may be damaged if force is applied.

2.2.3.2 INSTALLATION

(1) Using desoldering braid, remove the solder from the foil of

each pin of the flat pack-IC on the PWB so you can install
a replacement flat pack-IC more easily.

(2) The z mark on the flat pack-IC indicates pin 1. (See Fig.2-

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.2-8.)

(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.

To Solid
Mounting Point

CBA

Fig.2-5

Hot Air Blower

Iron Wire

Soldering Iron

Fine Tip
Soldering Iron

or

Fig.2-7

Presolder

Flat Pack-IC

CBA

Fig.2-8

Tweezers

Fig.2-6

1-6 (No.YA712<Rev.002>)

Flat Pack-IC

2.2.4 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.

2.2.4.1 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.

2.2.4.2 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

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.

<I

ncorrec

t

>

<

C

orrec

1M

CBA

t

>

CBA

Grounding Band

1M

Conductive Sheet or
Copper Plate

(No.YA712<Rev.002>)1-7

SECTION 3

DISASSEMBLY

3.1 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

[10] Junction
CBA

3.2 Disassembly Method

[2] Rear Cabinet

[3] Inverter CBA

[4] Jack CBA

[5] Power Supply
CBA

[6] Jack Holder

[7] Digital Main
CBA Unit

[13] LCD Module
Assembly

[14] Front
Cabinet

[8] Speaker
Holder (L,R)

[9] Speaker(s)

[11] IR Sensor
CBA

[12] Function
CBA

Removal

Step/

Loc.

No.

Part

Remove/*Unhook/

Fig.

No.

Unlock/Release/

Unplug/Unclamp/

Note

Desolder

Stand

[1]

[2]

Assembly

Rear
Cabinet

D1 4(S-1) ---

D1 13(S-2), 2(S-3), 3(S-4) ---

6(S-5), *CN1001,

[3]

Inverter
CBA

D2

*CN1003, *CN1050,

D4

*CN1100, *CN1150,

---

*CN1200, *CN1900

Removal

Step/

Loc.

No.

Part

Remove/*Unhook/

Fig.

No.

Unlock/Release/

Unplug/Unclamp/

Desolder

Digital Main

[7]

CBA UnitD2D4

4(S-9), 2(S-10),
4(S-11), *CN3902,
Shield Box

Speaker

[8]

Holder

D3 *Hook ---

(L,R)

[9] Speaker(s) D3 8(S-12) ---

[10]

[11]

[12]

Junction
CBA

IR Sensor
CBA

Function
CBA

D3

Desolder ---

D4

D3

2(S-13), *CL103C ---

D4

D3

2(S-14) ---

D4

LCD

[13]

Module

D3 (S-15) ---

Assembly

Front

[14]

Cabinet

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

(1) (2) (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, un-

locked, released, unplugged, unclamped, or desoldered.

P = Spring, 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 Table."

Note

---

[4] Jack CBA

Power

[5]

Supply
CBA

D2

2(S-6), *CL701B ---

D4

7(S-7), *CN101,

D2

*CN301, *CN302,

D4

*CN801, *CN802

[6] Jack Holder D2 2(S-8) ---

1-8 (No.YA712<Rev.002>)

---