Challenger LT-32HLFH LCD Schematic

COLOR TFT-LCD TV
SERVICE MANUAL

MODEL : LT-32HLFH

CAUTION !!
BEFORE SERVICING THE TFT-LCD TV,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

SERVICE MANUAL

CONTENTS

Contents ------------------------------------------------------------------------- 2

Safety precautions ----------------------------------------------------------- 3

Servicing precautions ------------------------------------------------------- 4

Specifications ------------------------------------------------------------------ 5

Location of control ----------------------------------------------------------- 9

Trouble Shooting ------------------------------------------------------------- 12

Deassembly procedure ---------------------------------------------------- 14

Exploded Drawing ----------------------------------------------------------- 19

Wire dressing ------------------------------------------------------------------ 21

Adjustment instruction with Default Factory Data----------------- 22

Inspection instruction ------------------------------------------------------ 24

PCB Layout --------------------------------------------------------------------- 28

Schematic Diagram -----------------------------------------------------------31

Replacement part list -------------------------------------------------------- 32

Block Diagram ----------------------------------------------------------------- 40

Circuit descriptions ---------------------------------------------------------- 41

SERVICE MANUAL

SAFETY PRECAUTIONS

!! Important Safety Notice !!

Many electrical and mechanical parts in this chassis have special safety-related
characteristics.
These parts are identified by in the Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components
as recommended in this manual to prevent Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.

Leakage Current Hot Check (See below Figure)

Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor between a known good earth
ground (Water Pipe, Conduit, etc.) and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter with 1000 ohms/volt or more
sensitivity.
Reverse plug of the AC cord into the AC outlet and repeat AC voltage measurements for each
exposed metallic part. Any voltage measured must not exceed 0.75 volt RMS, which is,
corresponds to 0.5mA.
In case any measurement is out of the limits specified, there is possibility of shock hazard and
the set must be checked and repaired before it is returned to the customer.

Leakage Current Hot Check circuit

SERVICE MANUAL

SERVICING PRECAUTIONS

CAUTION!!

Before servicing receivers covered by this service manual, read and follow the SAFETY
PRECAUTIONS on page 2 of this publication.

General Servicing Precautions

1.Always unplug the receiver AC power cord from AC power source before;

ⓐRemoving or reinstalling any component, circuit board module or any other receiver assembly.
ⓑDisconnecting or reconnecting any receiver electrical plug or other electrical connection.
ⓒConnecting a test substitute in parallel with an electrolytic capacitor in the receiver.

CAUTION!! A wrong part substitution or incorrect polarity installation of electrolytic capacitors
may result in an explosion harzard.

2.Do not spray chemicals on or near this receiver or any of its assemblies.

3.Do not defect any plug/socket voltage interlocks with which receivers covered by this service
manual might be equipped.

4.Always connect the test receiver ground lead to the receiver chassis ground before
connecting the test receiver positive lead. Always remove the test receiver ground lead last.

5.Do not connect the test fixture ground strap to power supply heatsink in this receiver

Electrostatically Sensitive(ES) Devices

Some semiconductor(solid state) devices can be damaged easily by static electricity. Such
components commonly are called Electrostatically Sensitive(ES) Device.Examples

Circuit Board Foil Repair

Excessive heat applied to the copper foil of any printed circuit board will weaken the adhesive
that bonds the foil to the circuit board causing the foil th separate from or “lift-off” the board.
The following guidelines and procedures should be flollowed whenever this condition is
encountered.

At IC Connections

To repair a defective copper pattern at IC connections use the following procedure to install a
jumper wire on the copper pattern side of the circuit board.(Use this technique only on IC
connections.)

1.Carefully remove the damaged copper pattern with a sharp knife.
(Remove only as much copper as absolutely necessary.)

2.Carefully scratch away the solder resist and acrylic coating(if used) from the end of the
remaining coopper pattern.

3.Bend a small “U” in one end of a small guage jumper wire and carefully crimp it around the
IC pin.

4.Route the jumper wire along the path of the out-away copper pattern and let it overlap the
previously scraped end of the good copper pattern. Solder the overlapped area and clip off
any excess jumper wire.

SERVICE MANUAL

SPECIFICATIONS

Note: Specifications and others are subject to change without notice for improvement.

1.Scope.

This document is the specification of 32” TFT-LCD Color TV.

2.Power

1) Power requirement
150W

2) AC / DC SMPS.

Input Frequency : 50 / 60㎐

Input Voltage: AC 100V- 240V 2.5A ~1.5A
Output Voltage: DC 12V, 24V

3) Power cord
Use UL listed and CSA certified detachable power cord type; SVT, 3-conductors, 18AWG
For AC 120V area. Use VDE listed detachable power cord type; HO5VV-F, 3-conductors,

18AWG for AC 220 240V area.～

3.Tuning system

FVS 100 Program

4.Sound output

10W+10Wrms Stereo (Max)

5.Antenna input impedance

VHF / UHF at 75ohm

6.OSD Type (On Screen Display)

Windows type (Center)

7.External in/output

HDMI INPUT, PC ANALOG INPUT, PC AUDIO INPUT, HEADPHONE OUTPUT, SVC port
S-VIDEO AUDIO INPUT, S- VIDEO INPUT, COMPONEN INPUT, COAXIAL OUT,
SCART 1(FULL), SCART 2(HALF), TUNER

8. Function

CATV/Hyper band
Auto Program
Manual Program
Auto Sleep
Quick view
ACMS(Auto channel Memory System)
PSM(Picture Status memory)
SSM(Sound Status memory)
PIP : COMPONET, PC-ANALOG, HDMI(Main) – Tuner, SCART 1, SCART 2, S-Video(Sub)

TUNER, SCART1, SCART2, S-Video(Main) – PC ANALOG, HDMI, COMPONET(Sub)
ARC(ASPECT RATIO CONTROL)

SERVICE MANUAL

9.Receiving RF TV system

NO

Model System
1 PAL-B
2 PAL-G
3 PAL-I, I /I
4 PAL-D
5 PAL-K
6 SECAM-B
7 SECAM-G
8 SECAM-D
9 SECAM-K

10 SECAM-K1
11 SECAM-I (6.0)
12 NTSC-3.58 / 4.5
13 NTSC-3.58 / 5.5
14 NTSC-3.58 / 6.0
15 NTSC-3.58 / 6.5
16 NTSC-3.58 / 4.5(5.0)
17 NTSC-4.43 / 5.5
18 NTSC-4.43 / 6.0
19 NTSC-4.43 / 6.5
20 PAL 5.5 / 60Hz
21 PAL 6.0 / 60Hz
22 PAL 6.5 / 60Hz
23 SECAM 5.5 / 60Hz
24 SECAM 6.0 / 60Hz
25 SECAM 6.5 / 60Hz
26 SECAM L / L'

TOTAL SYSTEM 18

SPECIFICATIONS

LT-32HLFH / /

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SERVICE MANUAL

SPECIFICATIONS

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10. PC Mode Scan Frequency & Timing

1) Scan Freq: H: 31～56 kHz / V: 56～75㎐

2) Preset Timing Chart

Note!! :

If the set is cold, there may be a small “flicker” when the set is switched on. This isⓐ

Normal, there is nothing wrong with the set.

If possible, use the XGA 1024 x 768@60HZ video mode ⓑ to obtain the best image quality

for your LCD monitor. If used under the other resolutions, some scaled or processed

pictures may appear on the screen.

Some dot defects may appear on the screen, like Red, Green or Blue spot. However, thisⓒ

will have no impact or effect on the monitor performance.

SERVICE MANUAL

SPECIFICATIONS

11. TFT – LCD Panel Character

Description

LTA320W2-L03 is a color active matrix TFT(Thin Film Transistor) liquid crystal display(LCD)
that uses amorphous silicon TFTs as a switching devices. This model is composed of a
TFT LCD panel, a driver circuit and a back-light system. The resolution of a 32.0" contains
1366 X 768 pixels and can display up to 16.7 million colors with wide viewing anale of

85˚or higher in all directions.

Features

- High contrast ratio, high aperture structure

- APVA(Advanced Patterned Vertical Align) mode

- Wide verwing anale(±170°)

- High speed response

- WXGA(1366 X 768 pixels) resolution(16:9)

- Low Power consumption

- Dyrect Type 16 CCFL(Cold Cathode Fluorescent Lamp)

- DE only mode

- LVDS(Low-Voltage Differential Signal) interface.(1pixel/clock)

Applications

- Home-alone Multimedia TFT-LCD TV

- Display terminals for AV applications products

- High Definition TV(HD TV)

● Feature

Size 32.0 inches

Driver element a-si TFT Active Matrix

Display area 697.6845mm(H) X 392.256mm(V)

Display colors 16.7M(true)

Number of Pixels 1366 X 768 Pixel(16:9)

Pixel arrangement RGB Vertical Stripe

Pixel Pitch 0.51075mm (H) x 0.51075mm(W)

Display mode

Surface treatment

SERVICE MANUAL

Normally Black

Haze 44%, Hard-Coating(3H)

LOCATION OF CONTROL

LOCATION OF CONTROL

All the functions can be controlled with the remote controller. Some functions can
also be adjusted with the buttons on the side panel of the set.

Remote controller

Before you use the remote controller, please install the batteries.

1. POWER

Turns the TV on from standby or off to standby mode.

2. MUTE

Turns the sound on and off.

3. NUMBER buttons

Selects programme numbers.

4. TV/AV

Selects TV,
RADIO(Only when the set is Radio On.),
COMPONENT, PC ANALOG, HDMI mode.
Clears the menu from the screen.

SCART1,SCART2

, S-VIDEO,

5. MENU

Displays a main menu.

6. LIST

Displays the programme list menu.

7. I/II

Selects the language during dual language broadcast.
Selects the sound output.

8. SLEEP

Sets the sleep timer.

9. PÏP

Returns to the previously viewed programme.

10. PRx/PRy (Programme Up/Down)

Selects next programme or a menu item.

11. OK

Accepts your selection or displays the current mode.

12. VOLÏ/VOLq (Volume Up/Down)

Adjusts the sound level.

13. TV/PC

Selects TV or PC mode directly.

SERVICE MANUAL

LOCATION OF CONTROL

LOCATION OF CONTROL

14. PICTURE( )

Recalls your preferred picture setting

15. SOUND( )

Recalls your preferred sound setting

16. ARC( )

You can watch TV in various picture formats;

16:9, 14:9, 4:3, 16:9 Zoom, 14:9 Zoom, 4:3 Zoom.

Repeatedly press the ARC button to select your
desired picture format.

Note. 16:9 and 4:3 in PC mode are available.

Auto,

17. TELETEXT buttons

These buttons are used for Teletext.
For further details, see the ‘Teletext’ section.

18. INPUT( )

Selects the AV source of sub picture in PIP mode.

19. PIP( )

Displays a PIP(Picture In Picture) screen.

20. POSITION( )

Selects a position of PIP screen.

21. SWAP( )

Switches a main picture to sub picture in PIP mode.

22. MODE( )

Selects a PIP screen mode. – 16:1, 9:1 and 3:1 mode.

23. PIP PRx/PIP PRy

Selects a programme when RF signal is displayed in
PIP mode.

24. Ïq

Adjusts menu settings.

SERVICE MANUAL

1-3. Controller of Panel

< SIDE VIEW>

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6

7

SERVICE MANUAL

LOCATION OF CONTROL

1.ON/OFF:

Switches TV set on or off.

2.MENU:

Display a menu.

1

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3.+ PR - ( Programme Up/Down):

Selects a programme or a menu item.

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2

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4.+ VOL -( Volume Up/Down):

Adjusts the volume.
Adjusts menu settings.

3

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5.TV/AV:

Selects input signal source.
Clears the menu from the screen.

6:POWER INDICATOR:

Illuminates red when the TV is in-

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power standby mode.

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Illuminates green when the TV is­switched power on mode.
Illuminates amber when the TV is­switched power saving mode.

7.REMOTE CONTROL SENSOR:

Accepts the IR signal of remote
controller.

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5

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No Raster

TROUBLE SHOOTING

Check
P803 (8~12) : 24V?
P804 (6~10) : 24V

N

Check
Q804 (3) : 24V?

Y

Replace

Q800

N

Check
Q804 (3) : 24V?

:

Y

Check

Y

P303 (25~27) : 5V?

Check
IC805 (3) : 5V?

Check
IC821 (3) : 5V?

Replace
IC804

N

N

N

Replace LCD Panel.

Y

(If possible, replace
inverter module.)

Y

Replace
IC805

:

Y

Replace
IC821

:

Replace
Q804

Replace
SMPS

N

SERVICE MANUAL

No Sound &
Picture OK

TROUBLE SHOOTING

IC601 (4,7,12,15)
= 24V?

N

Check
24V Line

No Operation

IC601 (25-Mute)

Y

<

0.7V?

(L:Mute/ H:On)

IC101
(123/124 L/R)
Q104/105 (E)
Sound Wave ?

Replace IC101

N

N

ZD601 (C)

Y

< 1V?

Replace
ZD601

N

IC202 (10)

Y

= 0V?

Replace
IC202

N

No LED

Y

Resistance : 0 ?
IC804 (4) <->
GND

Y

Replace
IC804 / D850

LED blinking

Y

Check
All SCL/SDA
TTL Level ?

N

Replace
Non-Operation
IC.

Y

IC01 (69~75)
Scaler
Communic
ation Lines)
TTL Level ?

N

Replace IC01

SERVICE MANUAL

DEASSEMBLY PROCEDURE

1. Disassembly procedure

1).Back cover

Removal of Backcover

Remove 4 screws

Remove 16crews

SERVICE MANUAL

DEASSEMBLY PROCEDURE

2).Metal plate & Rear chassis

Slide away the metal plate

Removal of rear metal chassis...

Remove 5 screws

Remove 2 screws

SERVICE MANUAL

DEASSEMBLY PROCEDURE

3).Metal plate & Rear chassis

Remove Main PCB 10 screws

Removal of Main PCB

Remove 6 connector

SERVICE MANUAL

4).LCD Panel chassis

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SERVICE MANUAL

DEASSEMBLY PROCEDURE

Remove 22 screws, then take LCD-BRKT

Removal of LCD Module take LCD-BRKT

Removal of LCD Module

5).LCD Module

DEASSEMBLY PROCEDURE

Remove 8 screws, then take LCD-BRKT

Front mask remains after removing LCD Module

SERVICE MANUAL

,

MECHANICAL EXPLODED VIEW

NO PART NO DESCRI P T I ON MAT E RKAL COL OR F INISH Q'T Y

1 - DECO F RONT PM M A BLACK 1
2 610-006A SPEAKER

400-021C FRONT COVER PC+ABSSILVER,BLACK1

3
4 408-002D LENS S E NS OR PC TRA NS P A RE NCE 1
5IR PCB--1

AYCOLT40A01A

6CONTROL PCB--1
7 404-004B BLOCK KNOB ABS SILIVER 1
8 450-001Z CONT ROL P LA TE AL SI LI VER 1

9 PANV320W2L01 PANEL SAMSUNG - 1
10 407-005F BRKT L,R EGI - 2
11 407-001Z LCD BRKT EGI - 1
12 620-005D SMPS - - 1
13 AYMALT52A01A MAIN PCB ASS'Y - - 1
14 407-007S,T JACK SHIELD SPTH - 1
15 407-002L REAR SHIELD EGI - 1
16 407-003F BACK COVER PC+ABS DARK GRAY 1
17 401-0032 BOTTOM BRKT EGI - 1
18 450-001Y DECO STAND PMMA BLACK 1
19 450-004F,G,H REAR PLATE PVC BLACK 1
20 402-004W STAND BOTTOM ABS SILVER 1
21 402-004C STAND FRONT ABS DARK GRAY 1
22 401-0016 STAND BRKT EGI - 1
23 402-004D STAND REAR ABS DARK GRAY 1
24 410-001Q BTB 4*12 39
25 410-001K TTB 3*8 8
26 410-001L TTB 3*10 5
27 410-003R PBTB 4*10 4
28 410-002R PP 4*12 4
29 410-001R PB 4*8 13
30 410-001N FTB 3*6 18

SCREW TAPPING

SCREW MACHI NE

Ω

10W

10

-2

SZN

25

31

31

13

31

29

24

26

23

22

21

20

25

19

18

3

25

2

1

16

17

27

27

31

28

32

15

31

14

12

31

25

11

TITLE

SET Exploded Draw ing

DRAWING NO.

MA05-005

4 5

26

10

9

25

6

7

8

MATERIAL DATA

2005. 04. 18

THIS ENGR

D. H. KIM

TREATMENT GHK

MODEL APPD SCALE SHEET

LT32H - 1 / 1

1. Wire Dressing

Note: Using acetate

Using Copper (Conducted tape)

Using Ferrite Cpre

WIRE DRESSING

SERVICE MANUAL

ADJUSTMENT INSTRUCTION

(

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(L)

p

y

g

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WITH DEFAULT FACTORY DATA

1.SVC mode data Adjustment

NOTE!! When the EEPROM has been replaced, the SVC data should be restored as the

function of individual system and specification.
When the EEPROM has been replaced White Blance Checking.

[ Enter and exit SVC mode ]
Note: into the SVC mode, Initialize with default data.

1) Press 5 Seconds MENU buttons on both TV set and Remote Controller at the same
time to get into SVC mode.

2) Press the PR ▲▼ button several times to find SVC Data.

3) Input the corresponding SVC data referring to Table below with the VOL ◀▶, key.

4) Press TV/AV button to exit SVC mode

1-1. Factory outgoing setting & Initialize with default data (into the SVC mode)]

Main menu Change value Sub menu Change value

Model

Language Option EU 14EA

(TV White Balance)

Option 1

Audio Options

DRX

NVM Edit

Hotel Option

Reset TV-set

TV White Balance

Sub-menu

Option 1

Sub-menu

Audio Options

Sub-menu

Sub-menu
Sub-menu
Sub-menu
Sub-menu

Settings ALL

Start

PC Yes

System BG/I/DK/L

China/Australia No

AV1 RGB
Text WEST_EU

To

VPS/PDC YES

Data Service Text

ATS Dela

QURAN No

BG/I/DK + 21

FM Radio + 10

Scart Volume + 118

Surround 0

Mute if no carrier Yes

Hi

h Deviation No

STEREO Yes

Time 60

Game No

DVI Yes

DTV No

M+ 42

NICAM + 26

DUAL No

MONO No

YES

Waring: Do not change the “( )” item…

SERVICE MANUAL

ADJUSTMENT INSTRUCTION WITH DEFAULT FACTORY DATA

2. White Blance Checking

1. Panel : SSLTA320W2-L03-10K 2. MODEL : L

6. Setting : All Start Click

9. Pattern Generator : MSPG-3420
PATTEN : Patten No. : 33
MODE : 1024*768(13)

7. PC White Balance Setting中

10. Equipment : MSPG-925FS
MODE : 1024*768

3. La nguage Option :
EU 14E A

8. White Balance Setting Verify

4. PC Pattern Generator
1024 x 768, 60Hz
(Pattern Generator : MSPG-3420)

5. Setting : All

SERVICE MANUAL