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SERVICE MANUAL
LC-23Ixx1/ LC-26Ixx1/ LC-27Ixx1/ LC-30Ixx1
LC-32Ixx1/ LC-37Ixx1/ LC-42Ixx1
23"/26"/27"/30"/32"/37"/42" TFT-LCD TV/MONITOR
2005. 05. 19.
1
CONTENTS
1. SAFETY PRECAUTION 3
2. BLOCK DIAGRAM 4
3. GENERAL SPECIFICATION 12
4. TROUBLE SHOOTING 15
5. CONTROLS OF FRONT PANEL 18
6. CONNECTIONS OF BACK PANEL 19
7. REMOTE CONTROL HANDSET 20
8. CONNECTING DIAGRAM 21
9. PCB LAYOUT 22
10.FACTORY MENU30
11. SCHEMATIC DIAGRAM 35
12. EXPLODED VIEW 48
13. REPLACEMENT PARTS LIST 52
2
1. Safety Instructions
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.
AC Volt-meter
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
To Instrument's
exposed 0.15uF
METALLIC PARTS
1.5 Kohm/10W
3
2. BLOCK DIAGRAM
BLOCK DIAGRAM
`
4
IC FUNCTIONAL BLOCK DIAGRAM (MST5151A)
IC PIN ASSIGNMENT (MST5151A)
5
IC BLOCK DIAGRAM (MSP3410G)
IC PIN OUT (MSP3410G)
6
IC BLOCK DIAGRAM (MP7720)
IC PIN OUT (MP7720)
IC BLOCK DIAGRAM (TW9918)
7
IC PIN OUT (TW9918)
8
IC BLOCK DIAGRAM (VCT49xy I)
IC PIN OUT (VCT49xyI)
9
IC BLOCK DIAGRAM (CXA2069Q)
10
IC PIN OUT (CXA2069Q)
11
3. General Specification
No Item Specification Remark
Min Typ Max Unit
1. Video Input 1) NTSC M 3.579545 / 60 Hz
2) NTSC 4.43 4.433618 / 60 Hz
3) PAL 4.433618 / 50 Hz
4) SECAM 4.286 / 50 Hz
2. Component Input 480i/59.94/60Hz Table 1.
576i/50Hz (Component)
480p/59.94/60Hz
576p/50Hz
720p/50/59.94/60Hz
1080i/50/59.94/60Hz
3. RGB DTV Input 480p/59.94/60Hz Table 2.
576p/50Hz (RGB DTV)
720p/50/59.94/60Hz
1080i/50/59.94/60Hz
4. DVI DTV Input 480p/59.94/60Hz Table 3.
576p/50Hz (DVI DTV)
720p/50/59.94/60Hz
1080i/50/59.94/60Hz
5. RGB PC Input VGA (640x480) Table 4.
SVGA (800x600) (RGB PC)
XGA (1024x768)
SXGA (1280x1024)
UXGA (1600x1200)
MAC
6. DVI PC Input VGA (640x480) Table 5.
SVGA (800x600) (DVI PC)
XGA (1024x768)
SXGA (1280x1024)
UXGA (1600x1200)
MAC
7. HDMI Input 480p/59.94/60Hz Table 2.
576p/50Hz (RGB DTV)
720p/50/59.94/60Hz HDMI Input
1080i/50/59.94/60Hz (digital interface with
HDCP)
8. Input Voltage AC 100 ~ 240 V, 50hz / 60hz
9. External Interface DVI/ DVI DTV/ 1 DVI-I Connector
HDMI Input
RGB PC/RGB DTV 1 D-Sub 15 Pin
Input
PC Sound Input 1 Ear-phone Jack
(RGB PC,DVI)
Component/L/R 1 RCA 2P
COMPONENT Input 1 RCA 3P
Full SCART 1 SCART JACK
Half SCART
SPDIF Output 1 OPTICAL JACK
(HDMI)
RF Input 1 -
S-VIDEO Input 1 S-VIDEO JACK
12
< Table 1. > Component Signal Resolution
No Resolution H-freq(KHz) V-freq.(Hz) Pixel Proposed
clock(MHz)
1. 720x480 15.73 59.94 13.500 SDTV,DD 480i(525i)
2. 720x480 15.75 60.00 13.514 SDTV,DD 480i(525i)
3. 720x576 15.625 50.00 13.500 SDTV,DD 576i(525i)
4. 720x480 31.47 59.94 27.000 SDTV 480p
5. 720x480 31.50 60.00 27.027 SDTV 480p
6. 720x576 31.25 50.00 27.000 SDTV 576p
7. 1280x720 44.96 59.94 74.176 HDTV 720p
8. 1280x720 45.00 60.00 74.250 HDTV 720p
9. 1280x720 37.50 50.00 74.25 HDTV 720p 50Hz
10. 1920x1080 33.72 59.94 74.176 HDTV 1080i
11. 1920x1080 33.75 60.00 74.250 HDTV 1080i
12. 1920x1080 28.125 50.00 74.250 HDTV 1080i 59Hz
< Table 2. > RGB -DTV Signal Resolution
No Resolution H-freq(KHz) V-freq.(Hz) Pixel Proposed
clock(MHz)
1. 720x480 31.47 59.94 27.000 SDTV 480p
2. 720x480 31.50 60.00 27.027 SDTV 480p
3. 720x576 31.25 50.00 27.000 SDTV 576p
4. 1280x720 44.96 59.94 74.176 HDTV 720p
5. 1280x720 45.00 60.00 74.250 HDTV 720p
6. 1280x720 37.50 50.00 74.25 HDTV 720p 50Hz
7. 1920x1080 33.72 59.94 74.176 HDTV 1080i
8. 1920x1080 33.75 60.00 74.250 HDTV 1080i
9. 1920x1080 28.125 50.00 74.250 HDTV 1080i 59Hz
< Table 3. > DVI- DTV Resolution
No Resolution H-freq(KHz) V-freq.(Hz) Pixel Proposed
clock(MHz)
1. 720x480 31.47 59.94 27.000 SDTV 480p
2. 720x480 31.50 60.00 27.027 SDTV 480p
3. 720x576 31.25 50.00 27.000 SDTV 576p
4. 1280x720 44.96 59.94 74.176 HDTV 720p
5. 1280x720 45.00 60.00 74.250 HDTV 720p
6. 1280x720 37.50 50.00 74.25 HDTV 720p 50Hz
7. 1920x1080 33.72 59.94 74.176 HDTV 1080i
8. 1920x1080 33.75 60.00 74.250 HDTV 1080i
9. 1920x1080 28.125 50.00 74.250 HDTV 1080i 59Hz
13
< Table 4. > RGB -PC Signal Resolution
No Resolution H-freq(KHz) V-freq.(Hz) Pixel Proposed
clock(MHz)
1. 640x350 31.469 70.08 25.17 DOS
2. 720x400 31.469 70.08 28.32 DOS
3. 720x400 37.927 85.03 35.50 DOS
4 640x480 31.469 59.94 25.17 VESA(VGA)
5. 640x480 37.861 72.80 31.50 VESA(VGA)
6. 640x480 37.500 75.00 31.50 VESA(VGA)
7. 640x480 43.269 85.00 36.00 VESA(VGA)
8. 800x600 35.156 56.25 36.00 VESA(SVGA)
9. 800x600 37.879 60.31 40.00 VESA(SVGA)
10. 800x600 48.077 72.18 50.00 VESA(SVGA)
11. 800x600 46.875 75.00 49.50 VESA(SVGA)
12. 800x600 53.674 85.06 56.25 VESA(SVGA)
13. 832x624 49.725 74.55 57.28 Macintosh
14. 1024x768 48.363 60.00 65.00 VESA(XGA)
15. 1024x768 56.476 70.06 75.00 VESA(XGA)
16. 1024x768 60.023 75.02 78.75 VESA(XGA)
17. 1024x768 68.677 85.00 95.62 VESA(XGA)
18. 1280x768 47.693 60.0 80.12 VESA(WXGA)
19. 1280x768 60.091 75.0 102.87 VESA(WXGA)
20. 1280x768 68.504 85.0 118.37 VESA(WXGA)
21. 1280x1024 64.000 60.00 108.000 VESA(SXGA)
22. 1280x1024 74.405 69.99 125.000 VESA(SXGA)
23. 1280x1024 80.000 75.00 135.000 VESA(SXGA)
24. 1280x1024 91.100 85.00 157.500 VESA(SXGA)
25. 1600x1200 75.000 60.00 162.000 VESA(UXGA)
< Table 5. > DVI -PC Signal Resolution
No Resolution H-freq(KHz) V-freq.(Hz) Pixel Proposed
clock(MHz)
1. 640x350 31.469 70.08 25.17 DOS
2. 720x400 31.469 70.08 28.32 DOS
3. 720x400 37.927 85.03 35.50 DOS
4 640x480 31.469 59.94 25.17 VESA(VGA)
5. 640x480 37.861 72.80 31.50 VESA(VGA)
6. 640x480 37.500 75.00 31.50 VESA(VGA)
7. 640x480 43.269 85.00 36.00 VESA(VGA)
8. 800x600 35.156 56.25 36.00 VESA(SVGA)
9. 800x600 37.879 60.31 40.00 VESA(SVGA)
10. 800x600 48.077 72.18 50.00 VESA(SVGA)
11. 800x600 46.875 75.00 49.50 VESA(SVGA)
12. 800x600 53.674 85.06 56.25 VESA(SVGA)
13. 832x624 49.725 74.55 57.28 Macintosh
14. 1024x768 48.363 60.00 65.00 VESA(XGA)
15. 1024x768 56.476 70.06 75.00 VESA(XGA)
16. 1024x768 60.023 75.02 78.75 VESA(XGA)
17. 1024x768 68.677 85.00 95.62 VESA(XGA)
18. 1280x768 47.693 60.0 80.12 VESA(WXGA)
19. 1280x768 60.091 75.0 102.87 VESA(WXGA)
20. 1280x768 68.504 85.0 118.37 VESA(WXGA)
21. 1280x1024 64.000 60.00 108.000 VESA(SXGA)
22. 1280x1024 74.405 69.99 125.000 VESA(SXGA)
23. 1280x1024 80.000 75.00 135.000 VESA(SXGA)
24. 1280x1024 91.100 85.00 157.500 VESA(SXGA)
25. 1600x1200 75.000 60.00 162.000 VESA(UXGA)
14
4. TROUBLESHOOTING
No Raster
YES
No Raster
Check Fasten
P401 or P402 or NO P401 or P402
P403 or P403
Connector? Connector
YES
Check Fasten
NO
P800 ~ P805 P800 ~ P805
Connector? Connector
YES
Check Fasten
NO
P100_M,P101_M P100_M,P101_M
Connector? Connector
YES
Check Fasten
NO
P806,P807 P806,P807
Connector? Connector
YES
Contact A/S Team
15
No Picture
No Picture
YES
Check
NO Replace
IC403,IC404
Pin2 : High? IC403,IC404
YES
Check IC401 NO Replace
Pin3 : High?
YES IC401
Check X400 NO Replace
X400
YES
Check IC308 NO Replace
Pin3 : High? IC308
YES
Check NO Replace
IC300,IC301 IC300,IC301
Pin2 : High?
YES
Check NO Replace
IC500,IC501 IC500,IC501
Pin2 : High?
YES
Contact A/S Team
16
No Sound
YES
No Sound
NO Replace
Check X900 ? X900
YES
Check IC902 NO Replace
Pin3 :5V? IC902
YES
Check IC900 NO Replace
Pin 27,28? IC900
YES
Check Replace
NO
IC700,IC701 IC700,IC701
Pin 7
YES
Contact A/S Team
17
4. CONTROLS OF FRONT PANEL
1.MAIN POWER
switches the set on or off.
2.D / E (Programme Up/Down)
selects a programme or a menu item.
switches the set on from standby.
3.F / G (Volume Down/Up)
adjusts the volume.
adjusts menu settings.
4.MENU
selects a menu.
5. INPUT SELECT
selects TV, AV1, AV2, S-VIDEO, COMPONENT, PC-RGB, DVI mode.
switches the set On from standby.
6. POWER (I / )
switches the set on from standby or off to standby.
7.POWER/STANDBY INDICATOR ( )
illuminates red in standby mode.
illuminates green when the set is switched on.
8.REMOTE CONTROL SENSOR
18
5. CONNECTIONS OF BACK PANEL
1. DVI INPUT / RGB INPUT / AUDIO INPUT SOCKETS
Connect the set output socket of the PERSONAL COMPUTER to this socket.
2. AUDIO INPUT / COMPONENT INPUT (480i / 480p /720p / 1080i) SOCKETS
3. EURO SCART SOCKET
connect the euro scart socket of the VCR to these sockets.
4. Digital Audio (OPTICAL)
Connect digital audio from various types of equipment.
Note : In standby mode, these ports will not work.
5. AERIAL SOCKET
6. S-VIDEO INPUT
connect video out from an S-VIDEO VCR to the SVIDEO input.
7. POWER CORD SOCKET
This set operates on an AC power. The voltage is indicated on the Specifications page.
Never attempt to operate the set on DC power.
19
6. REMOTE CONTROL HANDSET
20
7. CONNECTING DIAGRAM
21
8. PCB LAYOUT
AV TOP PATTEN
22
AV TOP SILK
23
AV BOTTOM PATTEN
24
AV BOTTOM SILK
25
MAIN TOP PATTEN
26
MAIN TOP SILK
27
MAIN BOTTOM PATTEN
28
MAIN BOTTOM PATTEN
29
9. FACTORY MENU
Methods to enter Factory menu
- Power Off (Press "POWER" key).
- Press "Menu" key
- Press "Mute" key
- Press "OK" key
- Press "POWER" Key
- Factory menu
White Balance
- enter to Factory menu
- Press "OK" key or "VOL +" key.
- Auto-Cutoff : Adjusting Auto R,G,B Cutoff
(Input Mode:PC-RGB,DVI,COMPONET)
- R-Cutoff,G-Cutoff,B-Cutoff : Adjusting Red,Green,Blue Gain
(Input Mode:PC-RGB,DVI,COMPONET)
-Press "PR+" or "PR