AOC LT3290 User Manual
32’’ LCD TV |
Norcent LT3290 |
Service
Service
Service
Horizontal Frequency
3160 KHz
TABLE OF CONTENTS
Description |
Page Description |
Page |
Table Of Contents.......…….…..............................…........1
Revision List.…….….....................................……......2
Important Safety Notice.……..................……......3
1. Monitor Specification..…............................………........4
2. Operating Instructions……...……………….……….......5
2.1 The Use Of Remote Control..………….…..................5
2.2 Front Panel Control Knobs..............….......…...........6
2.3 OSD Operating…………….…............……...............7
2.4 How To Connect...………........................…............14
3. Input/Output Specification............……………............16
3.1 Input Signal Connector............………….................16
3.2 Factory Preset Display Modes........………...............17
4. Mechanical Instructions..………....……......................18
5. Repair Flow Chart…….……………………..................21
6. White Balance, Luminance Adjustment………….....23
7.PCB Layout………….…………………....….…….....25
7.1Main Board……...……………………....….......25
7.2Power Board………………………….....….......27
7.3.Key Board….…......………….................…….........29
7.4IR Board...……………...…..................................29 8. Block Diagram..……..............….......................30
8.1Main Board......……….………...............................30
8.2Power Board…...……...….…..........................31 9. Schematic Diagram...………….………..………….......32
9.1Main Board……...…..……..………......................32
9.2Power Board...……………….……………………...49
9.3Audio Board………..……………..………………..50
9.4Side Board …………………………………………..51
9.5IR Board…..……….………………………………..52 10. Exploded View……...................................................53 11.BOM List………………………….....……….……….....55
SAFETY NOTICE
ANY PERSON ATTEMPTING TO SERVICE THIS CHASSIS MUST FAMILIARIZE HIMSELF WITH THE CHASSIS AND BE AWARE OF THE NECESSARY SAFETY PRECAUTIONS TO BE USED WHEN SERVICING ELECTRONIC EQUIPMENT CONTAINING HIGH VOLTAGES.
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
1
32’’ LCD TV |
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Norcent LT3290 |
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Revision List |
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Version |
Release Date |
Revision History |
TPV Model |
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A00 |
Jan.-8-2007 |
Initial release |
E326MZNKWNNRNCP |
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2
32’’ LCD TV |
Norcent LT3290 |
Important Safety Notice
Proper service and repair is important to the safe, reliable operation of all AOC Company Equipment. The service procedures recommended by AOC and described in this service manual are effective methods of performing service operations. Some of these service operations require the use of tools specially designed for the purpose. The special tools should be used when and as recommended.
It is important to note that this manual contains various CAUTIONS and NOTICES which should be carefully read in order to minimize the risk of personal injury to service personnel. The possibility exists that improper service methods may damage the equipment. It is also important to understand that these CAUTIONS and NOTICES ARE NOT EXHAUSTIVE. AOC could not possibly know, evaluate and advise the service trade of all conceivable ways in which service might be done or of the possible hazardous consequences of each way. Consequently, AOC has not undertaken any such broad evaluation. Accordingly, a servicer who uses a service procedure or tool which is not recommended by AOC must first satisfy himself thoroughly that neither his safety nor the safe operation of the equipment will be jeopardized by the service method selected.
Hereafter throughout this manual, AOC Company will be referred to as AOC.
WARNING
Use of substitute replacement parts, which do not have the same, specified safety characteristics may create shock, fire, or other hazards.
Under no circumstances should the original design be modified or altered without written permission from AOC. AOC assumes no liability, express or implied, arising out of any unauthorized modification of design.
Servicer assumes all liability.
FOR PRODUCTS CONTAINING LASER:
DANGER-Invisible laser radiation when open AVOID DIRECT EXPOSURE TO BEAM.
CAUTION-Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.
CAUTION -The use of optical instruments with this product will increase eye hazard.
TO ENSURE THE CONTINUED RELIABILITY OF THIS PRODUCT, USE ONLY ORIGINAL MANUFACTURER'S REPLACEMENT PARTS, WHICH ARE LISTED WITH THEIR PART NUMBERS IN THE PARTS LIST SECTION OF THIS SERVICE MANUAL.
Take care during handling the LCD module with backlight unit
-Must mount the module using mounting holes arranged in four corners.
-Do not press on the panel, edge of the frame strongly or electric shock as this will result in damage to the screen. -Do not scratch or press on the panel with any sharp objects, such as pencil or pen as this may result in damage to the panel.
-Protect the module from the ESD as it may damage the electronic circuit (C-MOS). -Make certain that treatment person’s body is grounded through wristband.
-Do not leave the module in high temperature and in areas of high humidity for a long time.
-Avoid contact with water as it may a short circuit within the module.
-If the surface of panel becomes dirty, please wipe it off with a soft material. (Cleaning with a dirty or rough cloth may damage the panel.)
3
32’’ LCD TV |
Norcent LT3290 |
1. General Specifications
4
32’’ LCD TV |
Norcent LT3290 |
2. Operations Instructions
2.1 The Use of Remote Control
“POWER”
Press to power ON/OFF (standby) TV.
(Note:1.TV is never completely power off unless physically unplugged.
2.Press to turn on TV after the Power on status LED had changed to the Green color and stopped flashing. )
“VIDEO”
Press repeatedly to choose S-Video/Composite source mode (Video 1 ~ 4).
“COMP”
Press repeatedly to choose Component source mode (Video 5 ~ 6).
“PC”
Press repeatedly to choose VGA or HDMI source mode (Video 7 ~ 8).
“TV”
Press to choose ATSC/NTSC TV source mode.“0 ~ 9 /- number” Press to enter TV channel number to select channel (Press ‘-’ to indicate choosing the sub-channel).
“SLEEP”
Press to set a time period (OFF/ 30min/ 60min/ 90min) after which the TV should switch itself to standby mode.
“FREEZE”
Press to freeze the displayed picture
“VOL- / VOL+”
Press + or - to adjust the volume.
“MENU”
Press to open or exit menu.
”,“ ”,“OK”
Press to adjust the various function items on the menu.
“V-CHIP”
Press to lock / unlock Parental Control temporarily. (After setting the restricted table of MPAA or TV Rating.)
5
“DISPLAY”
Press to show the information about the input source TV
channel display resolution and current time.
“MUTE”
Press to set TV sound mute ON/OFF
“PREV CH”
Press to display the previous TV.
“MTS/SAP”
Press to activate the NTSC TV sounds, such as: Stereo, SAP or Mono tone.
“WIDE”
Press to choose the display aspect as: Normal, Wide, Zoom or Cinema mode.
“SOURCE”
Press repeatedly to choose the various input sources (Video 1 ~ 8). Press + or - to browse through the TV channels.
“Exit”
Press to exit menu or OSD.
“VIDEO ADJ”
Press to choose the Brightness or Contrast adjustment.
“AUDIO ADJ”
Press to switch the ATSC multi-channel TV sounds.
“CC”
Press repeatedly to change the closed caption type as
CC ON /CC ON WHEN MUTE/CC OFF.
“EPG”
Press to show the information the same as “DISPLAY” key.
“FAV”
Press to display the favorite TV channel.
(After setting the favorite TV channel on main menu).
32’’ LCD TV |
Norcent LT3290 |
2.2 Front Panel Control Knobs
6
32’’ LCD TV |
Norcent LT3290 |
2.3 OSD Operations
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32’’ LCD TV |
Norcent LT3290 |
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32’’ LCD TV |
Norcent LT3290 |
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32’’ LCD TV |
Norcent LT3290 |
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32’’ LCD TV |
Norcent LT3290 |
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32’’ LCD TV |
Norcent LT3290 |
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32’’ LCD TV |
Norcent LT3290 |
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32’’ LCD TV |
Norcent LT3290 |
2.4 How to Connect
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32’’ LCD TV |
Norcent LT3290 |
15
32’’ LCD TV |
Norcent LT3290 |
3. Input/Output Specification
3.1 Input Signal connector
This procedure gives you instructions for installing and using the LCD TV display.
Lay the display on the desired operation and plug the power cord into a convenient AC outlet. Three-wire power cord must be shielded and is provided as a safety precaution as it connects the chassis and cabinet to the electrical conduct ground. If the AC outlet in your location does not have provisions for the grounded type plug, the installer should attach the proper adapter to ensure a safe ground potential.
Connect the 15-pin D-SUB color display shielded signal cable to your signal system device and lock both screws on the connector to ensure firm grounding. The connector information is as follow:
15 - Pin Color Display Signal Cable
Pin |
Signal Assignment |
Pin |
Signal Assignment |
1 |
Red Video |
9 |
No Pin! |
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2 |
Green Video |
10 |
Sync. Ground |
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3 |
Blue Video |
11 |
SDA (Remote Control) |
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4 |
SCL (Remote Control) |
12 |
Serial Data for DDC |
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5 |
GROUND |
13 |
Horizontal Sync. |
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6 |
Red Video Ground |
14 |
Vertical Sync. |
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7 |
Green Video Ground |
15 |
Serial Clock for DDC |
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8 |
Blue Video Ground |
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HDMI Digital connector pin assignments
Pin |
Signal Assignment |
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Pin |
Signal Assignment |
1 |
TMDS Data2+ |
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2 |
TMDS Data2 Shield |
3 |
TMDS Data2- |
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4 |
TMDS Data1+ |
5 |
TMDS Data1 Shield |
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6 |
TMDS Data1- |
7 |
TMDS Data0+ |
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8 |
TMDS Data0 Shield |
9 |
TMDS Data0- |
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10 |
TMDS Clock+ |
11 |
TMDS Clock Shield |
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12 |
TMDS Clock- |
13 |
CEC |
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14 |
NC |
15 |
SCL |
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16 |
SDA |
17 |
DDC/CEC Ground |
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18 |
+5V Power |
19 |
Hot Plug Detect |
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16 |
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32’’ LCD TV |
Norcent LT3290 |
Apply power to the display by turning the power switch to the "ON" position and allow about ten seconds for Panel warm-up. The Power-On indicator lights "GREEN" when the display is on.
With proper signals feed to the display, a pattern or data should appear on the screen, adjust the brightness and contrast to the most pleasing display, or press auto-adjust to get the best picture-quality.
This TV (with PC function) has power saving function following the VESA DPMS. Be sure to connect the signal cable to the PC.
If your TV requires service, it must be returned with the power cord.
3.2 Factory Preset Display Modes:
Analog RGB input signal timing
VESA MODES
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Horizontal |
Vertical |
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Nominal |
Sync |
Nominal |
Sync |
Nominal |
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Mode |
Resolution |
Total |
Frequency |
Polarity |
Freq. |
Polari |
Pixel |
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(KHz) |
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(Hz) |
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Clock |
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(MHz) |
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640x480@60Hz |
800 x 525 |
31.469 |
N |
59.940 |
N |
25.175 |
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VGA |
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640x480@72Hz |
832 x 520 |
37.861 |
N |
72.809 |
N |
31.500 |
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640x480@75Hz |
840 x 500 |
37.5 |
N |
75 |
N |
31.500 |
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800x600@56Hz |
1024 x 625 |
35.156 |
P |
56.25 |
P |
36.000 |
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SVGA |
800x600@60Hz |
1056 x 628 |
37.879 |
P |
60.317 |
P |
40.000 |
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800x600@72Hz |
1040 x 666 |
48.097 |
P |
72.188 |
P |
40.000 |
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800x600@75Hz |
1056 x 625 |
460875 |
P |
75 |
P |
49.5 |
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XGA |
1024x768@60Hz |
1344x806 |
48.363 |
N |
60.004 |
N |
65.000 |
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1024x768@70Hz |
1328x806 |
56.476 |
N |
70.069 |
N |
75.000 |
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1024x768@75Hz |
1312x800 |
60.023 |
P |
75.029 |
P |
78.750 |
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WXGA |
1360x768@60Hz |
1792x795 |
47.712 |
P |
60.015 |
P |
85.5 |
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HDMI input signal timing
VESA MODES
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Horizontal |
Vertical |
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Nominal |
Sync |
Nominal |
Sync |
Nominal |
Mode |
Resolution |
Total |
Frequency |
Polarity |
Freq. |
Polari |
Pixel |
(KHz) |
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(Hz) |
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Clock |
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(MHz) |
720P |
1280×720P |
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45.00 |
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60 |
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74.25 |
1080i |
1920X1080i |
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33.75 |
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60 |
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74.25 |
480P |
720X480P |
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31.54 |
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60 |
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27.00 |
480i |
720X480i |
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15.75 |
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60 |
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13.51 |
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32’’ LCD TV |
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Norcent LT3290 |
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4. Mechanical Instructions |
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Step |
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Figure |
Description |
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Preparation |
Remove the |
and |
screws |
remove |
remarked in |
the base |
red. |
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Remove the |
Remove |
screws |
back cover |
remarked in |
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red. |
18
32’’ LCD TV |
Norcent LT3290 |
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Remove the |
Remove the |
screws |
shield |
remarked in |
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red |
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Remove |
Remove the |
connector an |
the screws |
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boards |
remarked in |
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red |
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32’’ LCD TV |
Norcent LT3290 |
Remove main frame
Remove the bezel
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Remove the screws remarked in red
Remove the screws remarked in red
32’’ LCD TV |
Norcent LT3290 |
5. Repair Flow Chart
5.1 Abnormal display
CHECK CN901 PIN9 12V CN905 PIN3=5V?
OK
CHECK CN407 PANEL connect is normal?
OK
CHECK X401 X701 is normal?
OK
NG
Check POWER BOARD
NG
Reconnect CN407
NG
Check surge circuit
CHECK U401 PIN R5 PIN T8=3.3V? |
NG |
CHECK SCALER power |
U401 PIN E6=2.5V? PIN R9=1.8V?
OK |
OK |
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CHECK U108 PIN18, PIN17, PIN14 output wave is OK;
PIN9 PIN20 power supply is OK?
OK
CHECK I²C1DATA, CLK is normal?
OK
CHECK SCALER HS VS is normal?
OK
Check TV mode display is normal?
OK
Check Tuner circuit
21
32’’ LCD TV |
Norcent LT3290 |
5.2 No sound
Check speakers are ok?
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OK |
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NG |
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Check earphone is normal? |
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Check TPA6110A2 (U600) |
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Relative circuit is normal? |
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OK |
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OK |
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Check CS4335 (U405) PIN5 |
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PIN 8 output is normal? |
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Check Q2 MUTE circuit |
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OK |
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NG |
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Test NJM2199 (U2) PIN 12 PIN |
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Check NJM2199 (U2) PIN8 power |
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11 output is normal? |
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supply is normal? |
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OK |
OK |
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Test TPA3100(U1) PIN9 PIN10 |
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NG |
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Check TPA3100(U1) PIN21 |
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PIN11 PIN 12 is normal |
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power supply is normal? |
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OK |
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OK |
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CHECK X701 surge is normal?
OK
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NG |
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Check CAS-220/CS (U701) is |
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normal? |
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OK |
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NG |
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Check SF701 PIN5 4 signal |
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Check (U401) is normal? |
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input is normal? |
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OK
Check TUNER circuit
22
32’’ LCD TV |
Norcent LT3290 |
6. White Balance, Luminance Adjustment
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
First adjust PC mode and then adjust AV mode, HDMI mode, component 480i mode, component 480p mode. Before started adjust white balance, please set the Chroma-7120 MEM. Channel 01 to Cold color MEM. and channel 03 to Normal color, MEM. and channel 04 to warm color, MEM.(Our cold parameter is x = 291, y =306; normal parameter is x =299, y =315; warm parameter is x =308, y =325)
Color Temp. |
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Cold |
Normal |
Warm |
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x |
291 |
299 |
308 |
PC MODE |
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y |
306 |
315 |
325 |
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Y |
350 |
350 |
350 |
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x |
291 |
299 |
308 |
AV MODE |
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y |
306 |
315 |
325 |
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Y |
450 |
450 |
450 |
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x |
291 |
299 |
308 |
HDMI |
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y |
306 |
315 |
325 |
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Y |
420 |
420 |
420 |
COMPONENT |
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x |
291 |
299 |
308 |
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y |
306 |
315 |
325 |
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480i/480p |
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Y |
450 |
450 |
450 |
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Note: The tolerance of the color coordinates should be less than ± 20.
How to setting MEM. channel you can reference to Chroma-7120 user guide or simple use “ SC” key and “ NEXT” key to modify x, y , Y value and use “ID” key to modify the TEXT description
Following is the procedure to do white-balance adjust
Note: Step of AV, HDMI, COMPONENT480i, COMPONENT480p mode adjustment is the same as PC mode,
PC mode:
. In the TV mode adjust volume to zero and press number key 9 Æ 8 Æ 7 Æ 6. It will achieve the factory mode. Select the item of White Balance and press right key to enter it.
In the White Balance you can adjust 8 items.
1-3 items is RO, GO, BO Æ R, G, B Bias adjust. 4-6 items is RG, GG, BG Æ R, G, B Gain adjust. 7 item needn’t adjust
8 items is color temperature select: Cool, Normal, and Warm.
. Bias (Low luminance) adjustment:
1.Set the raster pattern (Black pattern with 1024×768) Input.
2.Adjust the brightness on OSD until chroma 7120 measurement reach the lowest value.
. Gain adjustment:
A. Adjust Cold color-temperature:
1.Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>350 cd/m2
2.Switch the chroma-7120 to RGB-mode (with press “MODE” button)
3.Switch the MEM. channel to Channel 01 (with up or down arrow on chroma-7120)
4.The LCD-indicator on chroma-7120 will show x =291, y =306, Y>350cd/m2
5.Adjust the 4 item: RG, until chroma 7120 indicator reached the value R=100
6.Adjust the 5 item: GG, until chroma-7120 indicator reached the value G=100
7.Adjust the 6 item: BG, until chroma-7120 indicator reached the value B=100
8.Repeat above procedure until chroma-7120 RGB value meet the tolerance =100±2
9.Switch the chroma-7120 to x, y, Y mode with press “MODE” button to check the color temp is in SPEC. or not.
10.Enter the 8 item to select another color temperature to adjust.
23
32’’ LCD TV |
Norcent LT3290 |
B. Adjust Normal color-temperature:
1.Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>350cd/m2
2.Switch the chroma-7120 to RGB-mode (with press “MODE” button)
3.Switch the MEM. channel to Channel 03 (with up or down arrow on chroma-7120)
4.The LCD-indicator on chroma-7120 will show x =299, y =315, Y>350cd/m2
5.Adjust the 4 item: RG, until chroma 7120 indicator reached the value R=100
6.Adjust the 5 item: GG, until chroma-7120 indicator reached the value G=100
7.Adjust the 6 item: BG, until chroma-7120 indicator reached the value B=100
8.Repeat above procedure until chroma-7120 RGB value meet the tolerance =100±2
9.Switch the chroma-7120 to x, y, Y mode with press “MODE” button to check the color temp is in SPEC. or not.
10.Enter the 8 item to select another color temperature to adjust.
C. Adjust Warm color-temperature:
1.Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>350cd/m2
2.Switch the chroma-7120 to RGB-mode (with press “MODE” button)
3.Switch the MEM. channel to Channel 04 (with up or down arrow on chroma-7120)
4.The LCD-indicator on chroma-7120 will show x =308, y =324, Y>350cd/m2
5.Adjust the 4 item: RG, until chroma 7120 indicator reached the value R=100
6.Adjust the 5 item: GG, until chroma-7120 indicator reached the value G=100
7.Adjust the 6 item: BG, until chroma-7120 indicator reached the value B=100
8.Repeat above procedure until chroma-7120 RGB value meet the tolerance =100±2
9.Switch the chroma-7120 to x, y, Y mode With press “MODE” button to check the color temp is in SPEC. or not.
10.Enter the 8 item to select another color temperature to adjust.
.Switch different source:
Press the source key on the remote control to switch different source to adjust the AV, HDMI, CONPONENT 480i and COMPONENT 480p mode.
Press “Exit” button on remote control to quit from factory mode.
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32’’ LCD TV |
Norcent LT3290 |
7. PCB Layout
7.1 Main Board
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32’’ LCD TV |
Norcent LT3290 |
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