Logik LCX27WN2 Service Manual

LOGIK

LCX27WN2

Service information

Nexgen Mediatech Inc.

LCD TV Maintance Manual Hand book

Approved by:

Title:

Level 1 Service Manual

Doc. No.

Version Date of new version Contents (Revision)

V1.0 2003.11.13 New release (new product)

Preparation Date

2003/11/13

Model

27”

Version

V1.0

Prepared by:

Alex Chen

Page

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Version
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Version
Date

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Nexgen Mediatech Inc.

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TITLE

Level 1 Service Manual

Table of content

1.Electric Specifications

2.Interface

3.System Block

4.Description of Level 1 Service Tools

5.Defect mode, Possible causes and Solution for End-Users

6.Exploded view Diagram

7.Disassembly/Assembly tools and procedure

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8.Troubleshooting Analysis

9.Upgrade System Bios

10.Defect code, Possible Cause and Changed Parts Summary

11. Test patterns and check points

12. Remark

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1 .

Electric Specifications

Nexgen Mediatech Inc.

Level 1 Service Manual

27” LCD TV Service Manual

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TITLE

VGA Supported Timing

Level 1 Service Manual

Nexgen Mediatech Inc.

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Standards

Item

1 NEC PC98 640x350 25.175 70.00 31.50 -/- VGA

2 MAC 13” mode 640x480 25.175 59.940 31.469 -/- VGA

3 MAC 16” mode 640x480 31.50 72.809 37.861 -/- VGA

4 MAC 17” mode 640x480 31.50 75.00 37.50 -/- VGA

5 VGA 640x480 36.00 85.008 43.269 -/- VGA

6 VGA 800x600 36.00 56.250 35.156 +/+ VGA

7 VGA 800x600 40.00 60.317 37.879 +/+ VGA

8 VESA 800x600 50.00 72.188 48.077 +/+ VGA

9 VESA 800x600 49.50 75.00 46.875 +/+ VGA

10 VESA 800x600 56.25 85.061 53.674 +/+ VGA

11 SVGA 1024x768 65.00 60.004 48.364 -/- VGA

12 VESA 1024x768 75.00 70.069 56.476 -/- VGA

13 VESA 1024x768 78.75 75.029 60.023 +/+ VGA

14 VGA 1280x1024 108.00 60.02 63.981 +/+ VGA

15 XGA 720x400 28.32 70.08 31.46 -/+ VGA

16 VESA 1280x720p 74.25 60.00 45.15 -/- VGA

17 VESA 1920x1080i 74.25 60.00 33.78 -/- VGA

Video Supported Mode

TV System

Video

Resolution

NTSC (3.58/4.43) / PAL (B/G,D/K,I) / SECAM (D/K,L)(not available for US region)

PAL：(not available for US region)

A2 and NICAM

Teletext

NTSC：

BTSC support (USA only)

EIAJ support (Japan only)

SAP/MTS

V-Chip

Close Captioning

480i SDTV support

Picture in Picture (Video on Graphic)

De-interlace support

2D noise reduction fillter

Dot Clock

(MHz)

Vertical

Scanning

Frequency

(Hz)

Horizontal

Scanning

Frequency

(KHz)

Sync

Polarity or

composite

sync (H/V)

Operating

Mode

Note

4

TITLE

2. Interface

2.1 VGA Interface

Pin Function Signal

Nexgen Mediatech Inc.

Level 1 Service Manual

1

Red

2

Green

3

Blue

4

Reserved

5

Ground

6

Red Ground

7

Green Ground

8

Blue Ground

9

+5V DC

10

Sync. Ground

11

Reserved

12

DDC SDA

13

H-Sync.

14

V-Sync.

15

DDC SCL

VGA 15-Pin D-SUB Female Connector

Level

0. 7V

0.7V

0. 7V

TTL

TTL

TTL

TTL

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Impedance

75 Ohms

75 Ohms

75 Ohms

2.2 S-Video Interface

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2.3 YPbPr

omposite Interface

2.4 C

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Level 1 Service Manual

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2.5 TV RF Interface

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3. System Block Diagram

Inverter

Level 1 Service Manual

MCU LCD Panel Interface

Nexgen Mediatech Inc.

VER. A1

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LCD Panel

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Audio

A/D Converter Video Decoder

OSD Keypad & Indicate LED

&Speaker Connector

LCD

Controller

Processor

&

SDRAM

DC/DC Converter TV Module

Audio & Power Interface Graphic Interface

Speaker-R

Speaker-L

Amplifier

TV

Interface

Power

Adapter

To CATV

4. Description of Level 1 Service Tools

- Multimeter

- Screwdriver Plus Type

- Test Equipment :

A : Computer for Test VGA Mode

B : DVD Player for Test AV , SV , Component (YPbPr) Mode

C : TV Pattern Generator for Test TV Mode (e.g. Fluke 54200)

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Nexgen Mediatech Inc.

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Level 1 Service Manual

5. Defect mode, Possible causes and Solution for End-Users

Defect Mode Possible causes Solution

1.No picture

2.Abnormal colors 1.Is the signal line connected correctly? 1.Connect the signal line correctly.

3.Expanded picture

4.Picture is too dark 1.Are the brightness and contrast

5. Image too small or big 1. Need to adjust vertical control?

6.Only sound, no picture 1.Has the direction of input source

7.Only picture, no sound.

Is volume adjusted to

minimum?

8.Cannot use remote

control

9.No TV picture or picture

is unclear

10. Cannot receive

specified channels

11.No colors. 1.Is the hue/tint minimum? 1.Adjust the color setup in the Menu

12.Dotted lines or strips 1. The antenna is disturbed or is set on

13.Overlapped images or

ghost buildings)

1.Did you connect power supply core?

2.Did you turn on the power?

3.Is the signal line connected correctly?

4.Is the screen in power saving mode?

1.Is the signal line connected correctly?

2.Is the input signal outside the man-

datory frequency range?

minimum?

2. Need to adjust horizontal control?

changed?

2.Is input source connected correctly?

1.Is there any problem with input source?

2.To adjust the volume in properly.

3.Is sound line not connected?

1.Check if batteries are working?

2.Is there any disturbance from static and

thunder??

1. Cable is disconnected or connected not

very well

2. Channel is not stable

1. Never did Auto Scan

2. The channel was cancelled

3. The signal is too weak

wrong direction

2. The signal is amplified too high.

3. The signal is too weak.

1.The antenna is disturbed or is set on

wrong direction

1.Is the screen in power saving mode?

2.Turn on power supply.

3.Connect the signal line correctly.

4.Press any key of computer.

1.Connect the signal line correctly.

2.Enter signals in the mandatory

1.Adjust brightness and contrast.

1. Adjust to the wanted vertical size.

2. Adjust to the wanted Horizontal size.

1.Check the accuracy of the input source.

2.Check if circuits are connected

correctly.

1.Check the accuracy of the input source.

2.Adjust the volume to the proper level.

3.Connect sound line correctly.

1.Replace the batteries.

2.Turn off the power for 10 seconds; and

then turn it on again.

1. Connect cable line correctly

2. Fine tune the channel frequency

1. Adjust or move antenna.

2. Reduce the amplification rate.

3. Install the amplifier

1. Change input source to RF cable./

VER. A1

PAGE

frequency range.

3. Redo auto scan/Add the

channel/Fine tune the channel

frequency/Confirm the channel

exists/Confirm the antenna is

full channel(UHF/VHF)

4. Same as above

5. Same as above

Change the antenna location.

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6. Exploded view Diagram

Level 1 Service Manual

Nexgen Mediatech Inc.

VER. A1

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