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LOGIK
LCX27WN2
Service information
Nexgen Mediatech Inc.
LCD TV Maintance Manual Hand book Approved by:
Title:
Level 1 Service Manual Prepared by:
Alex Chen
Doc. No. Preparation Date Model Version Page
2003/11/13 27" V1.0 1 OF 31
Version Date of new version Contents (Revision)
V1.0 2003.11.13 New release (new product)
Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Version V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0
Date 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9
Page 21 22 23 24 25 26 27 28 29 30 31
Version V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0 V1.0
Date 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9 10/9
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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
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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27" LCD TV Service Manual
1 . Electric Specifications
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VGA Supported Timing
Vertical Horizontal Sync
Resolution Dot Clock
Standards Scanning Scanning Polarity or Operating
Note
Item Frequency Frequency composite Mode
(MHz)
(Hz) (KHz) sync (H/V)
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
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
TV System
BTSC support (USA only)
EIAJ support (Japan only)
SAP/MTS
V-Chip
Close Captioning
480i SDTV support
Picture in Picture (Video on Graphic)
Video
De-interlace support
2D noise reduction fillter
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2. Interface
2.1 VGA Interface
Pin Function Signal Impedance
Level
1 Red 0. 7V 75 Ohms
2 Green 0.7V 75 Ohms
3 Blue 0. 7V 75 Ohms
4 Reserved
5 Ground
6 Red Ground
7 Green Ground
8 Blue Ground
9 +5V DC
10 Sync. Ground
11 Reserved
12 DDC SDA TTL
13 H-Sync. TTL
14 V-Sync. TTL
15 DDC SCL TTL
VGA 15-Pin D-SUB Female Connector
2.2 S-Video Interface
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2.3 YPbPr
2.4 Composite Interface
2.5 TV RF Interface
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3. System Block Diagram
LCD Panel
Inverter MCU LCD Panel Interface Audio
Processor
&
LCD SDRAM Amplifier
Controller
DC/DC Converter TV Module
TV
Interface
A/D Converter Video Decoder
Graphic Interface Audio & Power Interface
Speaker-R
OSD Keypad & Indicate LED
Power To CATV
&Speaker Connector
Speaker-L Adapter
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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5. Defect mode, Possible causes and Solution for End-Users
Defect Mode Possible causes Solution
1.No picture 1.Did you connect power supply core? 1.Is the screen in power saving mode?
2.Did you turn on the power? 2.Turn on power supply.
3.Is the signal line connected correctly? 3.Connect the signal line correctly.
4.Is the screen in power saving mode? 4.Press any key of computer.
2.Abnormal colors 1.Is the signal line connected correctly? 1.Connect the signal line correctly.
3.Expanded picture 1.Is the signal line connected correctly? 1.Connect the signal line correctly.
2.Is the input signal outside the man- 2.Enter signals in the mandatory
datory frequency range? frequency range.
4.Picture is too dark 1.Are the brightness and contrast 1.Adjust brightness and contrast.
minimum?
5. Image too small or big 1. Need to adjust vertical control? 1. Adjust to the wanted vertical size.
2. Need to adjust horizontal control? 2. Adjust to the wanted Horizontal size.
6.Only sound, no picture 1.Has the direction of input source 1.Check the accuracy of the input source.
changed? 2.Check if circuits are connected
2.Is input source connected correctly? correctly.
7.Only picture, no sound. 1.Is there any problem with input source? 1.Check the accuracy of the input source.
Is volume adjusted to 2.To adjust the volume in properly. 2.Adjust the volume to the proper level.
minimum? 3.Is sound line not connected? 3.Connect sound line correctly.
8.Cannot use remote 1.Check if batteries are working? 1.Replace the batteries.
control 2.Is there any disturbance from static and 2.Turn off the power for 10 seconds; and
thunder?? then turn it on again.
9.No TV picture or picture 1. Cable is disconnected or connected not 1. Connect cable line correctly
is unclear very well
2. Channel is not stable 2. Fine tune the channel frequency
10. Cannot receive 1. Never did Auto Scan 3. Redo auto scan/Add the
specified channels 2. The channel was cancelled channel/Fine tune the channel
3. The signal is too weak frequency/Confirm the channel
exists/Confirm the antenna is
full channel(UHF/VHF)
4. Same as above
5. Same as above
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 1. Adjust or move antenna.
wrong direction
2. The signal is amplified too high. 2. Reduce the amplification rate.
3. The signal is too weak. 3. Install the amplifier
13.Overlapped images or 1.The antenna is disturbed or is set on 1. Change input source to RF cable./
ghost buildings) wrong direction Change the antenna location.
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6. Exploded view Diagram
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7.Disassembly/Assembly tools and procedure for 27"
Tools 1. 27"
2. Back view 3. Lateral view
4. 5. Release 6 screws as arrow
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6. Appearance of stand 7. Release 8 screws as arrows
8. Take of tuner box and AV box 9. Take off adaptor
10. AV box 11. Tuner Box
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12. Release 15 screws as arrows 13. Take off wall mount bracket
14. Wall mount bracket 15. Loosen 8 screws on the speaker boxes.
16. Speaker boxes 17. Loosen 3 screws and take off speaker
cable.
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18. Take off 4 screws and the pc panel bracket. 19. PC panel bracket.
20. Take off pc panel bracket. 21. Loosen 8 screws on main board.
22. Disconnect 8 cables and take off 23. Loosen 2 screws on key pad
main board and disconnect two cable of inverter.
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24. Take off Key pad set. 25. Release 2 screws on key pad.
26. Key pad board. 27. Loosen 2 screws on IR board.
28. Loosen 10 screws and separate front 29. Hinge and stand disassembly
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29-1 29-2
29-3 29-4
29-5 29-6
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8.Troubleshooting Analysis
Defect Mode Failure Analysis Repair Testing
Light On Test Missing Line Check PCB AD/B Change
Check Panel Panel Change
Abnormal Bright Dot
Display
Dark Dot
Backlight
Light Leakage
Mura Check Panel Panel Change
Image Sticking
Brightness spot
Particle
Dot Defect
No display Check PCB AD/B Change
Inverter Change
Check Panel Panel Change
Noise Check PCB AD/B Change
Check Panel Panel Change
A NG
Next Step TEST
Complete
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Defect Mode Failure Analysis Repair Testing
Flicker Check PCB AD/B Change
Image is Inverter Change
too dark
Gray value Check PCB AD/B Change
display
Check Panel Panel Change
R. G. B Check PCB AD/B Change
display
abnormal
Check Panel Cable Panel Cable Change
Display Check PCB AD/B Change
Shut Down
Inverter Change
Check Panel Panel Change
VGA No Check PCB AD/B Change
Image
Check D-sub Cable D-sub Cable Change
Power on
Display
Check PCB AD/B Change
abnormal
NG TEST
Next Step
A Complete
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Defect Mode Failure Analysis Repair Testing
ON/OFF
Abnormal No Power Check PCB AD/B Change
Keypad/B Change
Check FFC FCC Change
LED
display LED off AD/B Change
Check PCB
abnormal
LED Dark Keypad/B Change
LED Abnormal
Check FFC FCC Change
LED Flicker
Power Saving Mode Push Any Key
in VGA to Restart
Abnormal
Keyboard Unavailable Check PCB AD/B Change
Keypad/B Change
Check FFC FFC Change
NG TEST
Next Step
Completed
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Defect Mode Failure Analysis Repair Testing
Other Display flicker
Abnormal (tapping ) Check PCB AD/B Change
Display
Check Panel Inverter Change
Cannot use
Check keypad board Keypad Change
remote control
Remote Control or
Check remote Battery Change
Check FFC FFC Change
NG TEST
Next Step
Completed
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Defect Mode Failure Analysis Repair Testing
Audio Sound adjust
Abnormal abnormal Check PCB AD/B Change
No sound Check Speaker Speaker Change
Check FCC FCC Change
Single sound Check PCB AD/B Change
Keypad/B Change
Hear phone Check hear phone
defect Jack AD/B Change
Check FFC FCC Change
Check PCB AD/B Change
TEST
Completed
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Defect Mode Failure Analysis Repair Testing
Video AV , SV , CV
Abnormal No Image Check PCB AD/B Change
( AV , SV ,
CV , TV )
Check Cable Cable Change
TV No Image
Check PCB AD/B Change
Check RF Cable RF Cable Change
Check TV Module TV Module Change
TV No Sound Check PCB AD/B Change
Check TV Module TV Module Change
TV No Close
Caption
or V-Chip
(NTSC)
TV No
Teletext
( PAL ,
SECAM )
TEST
Completed
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Defect Mode Failure Analysis Repair Testing
Abnormal Can't Upgrade
BIOS BIOS Check PCB AD/B Change
Upgrade
TEST
Completed
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9 . Upgrade System Bios
Explanation of Programmable ISP (In System Program)
Use designed ISP tool to upgrade system BIOS. To press Ch- and Ch+ on key pad
simultaneously, to get into factory mode, to choose ISP item then change 0 to 1 by vol.
Pad.
9.1 Preparation before upgrade
Power switch
RS232 port
DC12(V)
ISP port
(D-Sub15)
9.2 Use RS-232 signal line to connect RS 232 OUT port of PC and the RS 232 IN PORT
of ISP tool. Use RGB signal line to connect VGA OUT port of ISP tool and VGA IN
port of LCD TV. Power on ISP tool, shown as below.
3. Plug in
4. Power on DC power
supply
2. Connect to 1. Connect to
VGA IN port RS232 OUT
of LCD TV port of PC
9.3 The CPU used for processing ISP need to burn LD0415.BIN to the LDROM of CPU.
(Has burned before shipping)
9.4 Need to enter factory mode by pushing "747+enter" button on remote control to
execute ISP mode.
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9.5 Execute ispwriter.exe file
To execute 8051IspWriter.exe file on your PC and the screen below appears.
9.6 Move the cursor to click "Select Chip" button and select the type of CPU(W78E65).
9.7 Move the cursor to click "Select Bank0" button to select the wanted burning program.
The file format is binary format instead of hex format.
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9.8 Select the Port name on Communication setting screen.
9.9 Move the cursor to click "Connect" button to link. If the linking succeeds, it will show
"Connected" on Communication Setting screen.
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9.10 Click "Program All" button to execute erase and write function. After execution
screen below will appear. Click "confirm" button to finish the execution.
9.11 To click "verify" button to execute verify function. After verification screen below will
appear. Click "confirm" button to finish the verify function.
9.12 After updating EPROM program, disconnect ISP tool. Power on LCD TV again.
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10.Defect code, Possible Cause and Changed Parts summary
Items Defect mode Code Possible Cause and Changed Parts
1 No power F1 Power cord/adaptor, power supply, Keypad board, main board
2 No picture F2 Is on power saving mode? Each input signal is abnormal?
3 Missing line F3 Main board, panel, panel-MB cable
4 Bright/dark dot F4 Main board, panel, within dot spec
5 Abnormal Display F5 Frequency of input signal is normal, main board, Tuner
6 R. G. B display abnormal F6 Adjust Hue/Tint
7 Polarizer defect F7 Panel surface has scratch, crack or any surface defect?
8 Picture is too dark F8 Adjust brightness or contrast, inverter failure
9 Audio Abnormal F9 Speaker, audio cable, Tuner
10 Audio/Video not clear F10 Signal frequency, fine tune RF frequency, tuner
11 Only sound, no picture F11 Signal frequency, fine tune channel frequency, tuner
12 Only picture, no sound F12 Signal frequency, fine tune channel frequency, tuner, speaker,
audio cable
13 Cannot use remote control F13 Battery, control angle smaller than 30 degree and 5 meter away
from the destination
14 Display Shut Down F14 Power supplier, keypad board, main board
15 No picture F15 Adjust hue/tint, main board
16 No TV picture or picture is F16 TV cable, RF signal frequency, the direction of
unclear antenna, main board
17 Flicker F17 Input signal not stable, inverter, main board
18 TV No Teletext ( PAL , F18 TV module, main board, firmware
SECAM )
19 NTSC SAP/MTS failure F19 Tuner, main board, firmware
20 Appearance and F20
mechanism
21 Others F21 Please attach electronic picture and explain
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11.Test patterns and check points
1 Dot on/off SMPTE RP133 16 Gray scale
*Check if Clock & Phase is *Check if vertical line and horizontal *Check the amplitude of RF signal
distorted. line is clear around the center, is distorted.
four corners *Check the gray scale is over
*Check brightness and contrast saturated.
32 Gray scale 64 Gray scale 256 Gray scale
*Check the amplitude of RF signal is *Check the amplitude of RF signal is *Check the amplitude of RF signal
distorted distorted is distorted
*Check the gray scale is over *Check the gray scale is over *Check the gray scale is over
saturated. saturated. saturated.
Black White 1 Dot on/off
*Check noise, leakage, ghost *Check noise, leakage, ghost image *Check static convergence
*Check pixel bright/dark dot. *Check pixel bright/dark dot.
Color RGB
*Check color quality, decoding *Check pixel bright/dark dot.
,color transformation, chroma *Check color quality
/hue/tint time equalization, color
saturation.
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12.Remark (SPARE PARTS LIST)
Material Item S/N Item
Key parts 180-270001-101 PANEL LCD 27" WXGA 1280*720
185-115001-101 ADAPTER 150W 12V
PCBA 196-270001-101 NLC27C1 INVERTER VER5.0
510-271003-011 NLC27C1 MAIN BOARD PCBA VER.1
510-272002-011 PCBA NLC27C1 IR BOARD
510-272003-011 PCBA NLC27C1 KEY BOARD
Accessory 170-041801-101 P-CORD 250V 10A EU 3P BLK 1.8M
171-071801-101 CAB VGA 15P BLACK 28AWG 1.8M
Internal cable 174-270302-101 WIRE W/B 27 SPK-L 3PIN L=650MM
174-270301-101 WIRE 27" SPK-R 3PIN L=750MM
174-270601-101 WIRE 27" IR 6PIN L=420MM
174-270602-101 WIRE 27" POWER 6PIN L=200MM
174-271001-101 WIRE 27" KEYPAD 10PIN L=150MM
174-272201-101 WIRE 27" INVERTER 22PIN L=250
174-273001-101 WIRE W/B NLC27C1 30PIN L=60MM
Packing meterial 401-270003-021 T27001 MAIN CARTON LUXOR
403-270005-011 EPE CUSHING STAND NECK
403-270007-011 NLC27C1 EPE CUSHING TOP
403-270008-011 NLC27C1 EPE CUSHING BOTTOM
A44-L27C9-001 NLC27C1 EPE BAG
240-420001-011 CARTON LOCK
Mechanical parts 154-050402-101 SPK 5W 4R
154-050802-101 SPK 5W 8R 57*55*38 FULL RANGE
154-100004-101 SPK 5W 8R
462-270001-011 T27001 LOGO FOR DIXONS
200-270001-0101 NLC27C2 FRONT BEZEL
200-270003-0101 NLC27C1 ADAPTOR COVER
200-270004-0101 NLC27C1 AV COVER
200-270005-0101 NLC27C1 PC COVER
200-270006-0101 NLC27C1 BACK COVER
200-270007-0101 NLC27C1 STAND BASE COVER
200-270009-0101 NLC27C1 STAND FRAME COVER
200-270010-0101 NLC27C1 LIGHT GUIDE
200-270011-0101 NLC27C1 POWER BUTTON
200-270012-0101 NLC27C1 FUNCTION KEY
200-270013-0101 NLC27C1 IR FILTER
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200-270014-0101 NLC27C1 SPEAK BOX
200-270015-0101 NLC27C1 FUNCTION PANEL
200-270017-0101 NLC27C1 STAND FRAME PLATE
210-270007-011 NLC27C1 PC NAME PLATE
250-270007-011 NLC27C1 MAIN COVER BRACKET
250-270008-011 NLC27C1 PANEL BRACKET
250-270009-011 NLC27C1 PC PANEL BRACKET
250-270010-011 NLC27C1 SPEAKER NET
250-270011-011 NLC27C1 STAND BASE BRACKET
250-270012-011 NLC27C1 STAND FRAME BRACKET
250-270016-011 NLC27C1 WALL MOUNT BRACKET
Screw 600-030004-010 SCREW M4*12 PAN HEAD
600-030008-041 SCREW M3*8 PAN HEAD
600-040008-040 SCREW M4*8 PAN HEAD
600-440012-110 SCREW M4*12MM PAN HEAD
600-740008-040 SCREW T4*8 PAN HEAD TP-P
600-740012-040 SCREW T4*12 P-HEAD
601-730008-040 SCREW T3*8 TP-P BINDING HEAD
602-030006-010 SCREW M3*6 PAN/WAS-HEAD
602-730008-010 SCREW T3*8 PHW TP-P
602-740008-010 SCREW T4*8 PHW TP-P
603-040008-040 SCREW M4*8 I-HEAD
605-140007-010 SCREW HEX 4#-40*7
608-730010-030 SCREW T3*10 TP-P PH+W(10)
609-020005-030 SCREW M2*5 PH+SW+W
609-140015-040 SCREW M4*15 PH+SW+W
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