Akira LCT-20CVST User manual

LCT TV

Service Manual

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Model No.: LCT-20CVST

Version: 1.0

MODEL:

LCT-20CVST

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Model No.: LCT-20CVST

Version: 1.0

CONTENTS

SPECIFICATION..................................................................................................................................... 4

ADJUSTMENT SPECIFICATION.......................................................................................................... 8

PCB ASSEMBLY FUNCTIONAL DESCRIPTION ............................................................................. 11

BLOCK DIAGRAM .............................................................................................................................. 16

IMPORTANT IC LIST........................................................................................................................... 17

TROUBLE SHOOTING ........................................................................................................................ 18

EXPLODED VIEW................................................................................................................................ 22

PART LIST............................................................................................................................................. 30

CIRCUIT DIAGRAM............................................................................................................................ 32

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Model No.: LCT-20CVST

Version: 1.0

SPECIFICATION

LCD Panel

 LG-Philips LCD Panel : LC201V02-A3

 Active Screen Size : 20.1 inches (584.40m/m) diagonal

 Outline Dimension : 432(H) x 331.5(V) x 25.0(D)mm(Typ)

 Pixel Pitch : 0.6375mm x 0.6375 x RGB

 Pixel Format : 640 horiz. By 480 Vert. Pixels RGB strip arrangement

 Color Depth : 8bit, 16.7M Colors

 Luminance, White : 450 cd/

 Response Time : 25msec (Rise 13ms + Decay 12ms)

 Viewing Angle : R/L 176 Degree, U/D 176 Degree

 Backlight Assembly : 6 CCFL

 Contrast Ratio : 350 : 1

In/Out Jack

 Power Input : AC100 ~ 240V 50 ~ 60Hz

 Antenna Input : 75 Ohm Unbalanced Coaxial Cable

 PC Input : 15 Pin D-sub Jack(Female Type) – RGB Analog Input, Included Main Board

 PC Audio Input : Phone Jack(Stereo) – From PC, Included Main Board

 Video & Audio In/Out – Included Sub Board

- Video Input 1(Composite RCA 3Pin, Included Audio 2Pin)

- Video Input 2(Composite RCA 3Pin, Included Audio 2Pin)

- DVD Input (Y Cb Cr, RCA 3Pin)

- S-Video Input

- EURO Scart Jack

- Headphone Output (Phone Jack, Stereo)

- A/V Output (Scart Jack)

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Model No.: LCT-20CVST

Version: 1.0

User Interface

 7 Panel Key

 Power , Menu , Select , Vol Up , Vol Down , CH Up , CH Down

 3 Color LED

 Red : Stand by Condition

 Green : Power On Condition

 Yellow : SLEEP TIME On Condition

 Remocon Receiver

 Remocon (42Key )

 On Screen Display

 Control using OSD

 OSD Language : English, Arab

 Plug & Play : DDC - 1/2B

 Factory Mode

 Mode for controlling the adjustment item & Panel Option in mass production

Electrical specification

In /Out Items Sub Items Specification

Video 1, 2 Level 1±0.1p_p (75Ω)

Analog RGB 0.7±0.1Vp_p (75Ω)

H Frequency 31KHz

V Frequency 56~85Hz

Y: 1Vp_p

Cb: 0.7Vp_p

DVD Level

Cr: 0.7Vp_p

INPUT

Sound Level 1.4±0.2Vp_p

(0.5Vrms)

A/V OUT Level 2±0.1Vp_p

OUTPUT Sound Speaker RMS 5W*2

Input Voltage AC 90~265 Vac

Input Frequency 47~63Hz

Output 1 Voltage DC 14.5~15.5V

Out Current Min 30mA~Max 2A

Output 2 Voltage DC 10.8~15V

LIPS

Out Current Min 0A~Max2A

POWER

Power Consumption 60W

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Model No.: LCT-20CVST

Version: 1.0

Available PC input mode & Video timing standard

Mode Resolution Horizontal

Frequency

(KHz)

Vertical

Frequency

(Hz)

Pixel Clock

Frequency

(MHz)

Sync Polarity

(H/V)

720 x 400 31.469 70.087 28.322 -/+

640 x 480 31.469 59.940 25.175 -/-

640 x 480 37.861 72.809 31.500 -/-

640 x 480 37.500 75.000 31.500 -/-

VGA

640 x 480 43.269 85.008 36.000 -/-

OSD Specification

 PICTURE

 CONTRAST

 BRIGHTNESS

 COLOR TEMPERAT ( PC input mode only )

 STANDARD , 6500K , USER, RESET , 9300K

 SHARPNESS ( Not Available PC MODE )

 COLOR ( Not Available PC MODE )

 SOUND

 TREBLE

 BASS

 BALANCE

 S.MODE

 GEOMETRY ( PC input mode only )

 H-POSITION

 V-POSITION

 AUTO POSITION

 FUNCTION

 TRACKING ( PC input mode only )

 AUTO TRACKING

 CLOCK

 PHASE

 INFORMATION

 TUNING ( TV input mode only )

 SORT

 AUTO TUNING

 MANUAL TUNING

 FINE TUNING

 CH SKIP

 LANGUAGE

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Model No.: LCT-20CVST

Version: 1.0

Factory Mode OSD Specification

 How to use Factory Mode

 Press Power & Select Key in Panel Control key, and go to Factory mode.

 Factory ADJ

 CLOCK DELAY

 AUTO COLOR GAIN

 OPTION

 MX88L281 1

 MST9883 1 ( PC input mode only )

 MST9883 2 ( PC input mode only )

 SUB C VCO

 SUB C CHG CURRENT

 INIT VCO CURRENT

 VPC3230 ( excluding PC MODE )

 CONTRAST

 BRIGHTNESS

 PEAKING

 CIP CONTRAST

 CIP BRIGHT

** In mass production, adjust only Factory ADJ item, do not adjust other Modes. ( In the time of

variation of A/S & initial condition of screen quality , built in other Modes for controlling )

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Model No.: LCT-20CVST

Version: 1.0

ADJUSTMENT SPECIFICATION

Adjustment instruction of CLOCK DELAY

1. Adjustment item: Adjust the dispersion happening in the time of matching ASSY-MAIN and LCD

PANEL. (As the contact status of the CONNCETOR for connecting LCD PANEL, dispersion

happens)

2. Adjustment Process: After assembling the SET, do the adjustment.

3. Preliminary adjustment:

1) Connect the outlet VIDEO PATTERN GENERATOR (ANALOG RGB &

SEPARATE H, V OUT) to INPUT (15PIN D-sub with VGA CABLE)

2) TEST PATTERN: 1DOT MOIRE PATTERN.

3) Select Output FORMAT into 640 x 480 @60HZ.

4) Turn on the SET, and them select in PC MODE.

4. Adjustment Instruction:

1) Press SEL & Power Key in Front panel at the same time , go to Factory mode

2) Select CLOCK DELAY (including in FACTORY ADJ MENU) with CH UP/DOWN

KEY in Factory mode

3) Changing the level of CLOCK DELAY with VOL UP/DOWN KEY, adjust to the

noiseless level in screen (variable range : 0 ~ 15, DEFAULT : 15)

-9-

Model No.: LCT-20CVST

Version: 1.0

Adjustment Instruction of AUTO COLOR GAIN

1. Adjustment Item: Function of automatically setting ADC LEVEL of AD9884 with ANALOG RGB

(D-sub) signal. (WHITE BALANCE & CONTRAST adjustment)

2. Adjustment Process: After assembling the SET, do the adjustment.

3. Preliminary Adjustment

 Connect Outlet of VIDEO PATTERN GENERATOR to the input terminal of D-SUB.

 TEST PATTERN : Select COLOR BAR PATTERN

 Turn on the SET, and then select in PC MODE.

4. Adjustment Instruction

 Press SEL & Power Key in Front Panel at the same time, and go to Factory mode.

 In Factory mode, select Auto Color Gain in Factory ADJ.

 Press VOL UP KEY, and then displaying the phrase " Processing ", AUTO

Adjustment start

 When adjustment is completed, the phrase " Processing " disappears

 Caution: In the course of Processing, do not remove the signal.

Setting Instruction for OPTION

1. OPTION : - X2 - BYPASS

 Using 6 BIT PANEL

 Back-Light Control of Inverter

(Bright Max: LOW, Min : HIGH)

2. OPTION : - X2 - INVERT

 Using 6 BIT PANEL

 Back-Light Control of Inverter voltage polarity

(Bright Max : HIGH, Min : LOW)

3. OPTION : - X3 - BYPASS

 Using 8 BIT PANEL

 Back-Light Control of Inverter voltage polarity

(Bright Max : LOW, Min : HIGH)

4. OPTION : - X3 - INVERT

 Using 8 BIT PANEL

 Back-Light Control of Inverter voltage polarity

(Bright Max : HIGH, Min : LOW)

*** Select no 4 in the case that no 4 is not selected.

-10 -

Model No.: LCT-20CVST

Version: 1.0

Adjustment Instruction of VPC3230

1. Adjustment item: Function of adjusting DEFAULT VALUE of VPC3230 DEVICE.

2. Adjustment process: After assembling the SET, do the adjustment .

3. Preliminary adjustment

 Connect Outlet of VIDEO PATTERN GENERATOR to the input terminal of CVBS.

 TEST PATTERN : Select COLOR BAR PATTERN

 Turn on the SET, and then select in VIDEO MODE.

4. Adjustment Instruction

 Press SEL & Power Key in Front Panel at the same time, and go to Factory mode.

 Select VPC3230 in Factory mode.

 Adjust to the following levels with VOLUME UP/DOWN, CH UP/DOWN

a. CONTRAST 52

b. BRIGHT 9

c. PEAKING 0

d. CIP CONTRAST 12

e. CIP BRIGHT 7

*** No need to adjust when the SET is stable.

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