AOC L37W551B User manual

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Service
Service
Service
TABLEOFCONTENTS
Description Page Description Page
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 VOLTAGE
Table Of Contents.......……..............................…........1
Revision List.…........................................……......2
Important Safety Notice.……..................……......3
1.General Specifications..............................………........4
2.Operating Instructions………..…………………….......5
2.1.The Use of Remote Control…................……...........5
2.2.To Use the Menu………..............................…...........7
2.3.LCD TV Description…….…..............……...............15
2.4.Interface Connector……............................…...........15
3.White Balance Luminance Adjustment……..…........16
4.Input/Output Description……..…………… ...........21
4.1.D-SUB Connector……...…………………....….......21
4.2.Factory Preset Display Modes……………..….......22
5.Front Panel Control Knobs…....................................22
6.Repair Flow Chart…….............................................23
7.Mechanical Instructions……………................28
8.PCB Layout..………….......................................34
8.1.Main Board……….....…….................................34
8.2.Power Board…...………...................................37
8.3.Audio Board…...………...................................40
8.4.IO Board…………............................................41
8.5.IR Board……………….......................................44
8.6.Key Board………………......................................45
9.Block Diagram………………..............................46
10.Schematic Diagram………………...............…47
10.1.Main Board..............................................47
10.2.Power Board....…….......................................59
10.3.Audio Board....………....................................60
10.4.IO Board....……..............................................61
11.Exploded View………..….......................................64
12.BOM List…….……………………………….............66
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

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Revision List
Revision Date Revision History TPV Model
A00 Mar-29-07 First Version Release E376ATNBW1A6N

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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 NOTICESARE
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 byAOC 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 openAVOID 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.)

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1. General Specifications
Item Specification
Screen Size 37” TFT-LCD Panel
Aspect Ratio 16 :9
Resolution 1366 x768
Display Area (opening) H x V 819.6mm x 460.8mm
Pixel Pitch 0.6mm x 0.6mm
Display Colors 16.7 million
Lamp Type/Life 60000 hr
LCD Panel
Viewable angle 178Û(H) 178Û(V)
Input support definition 1280*768 /60Hz
VGA Function Audio input Mini jack for stereo headphones (3.5ø)
TV Standard PAL,NTSC,SECAM
Sound System Mono, stereo, dual
TV Function
Color systems PAL,NTSC,SECAM
Video Input AV, S-VIDEO, Component, HDMI, PC, TV
Speaker (built-in): Two 8 watt speakers
Audio output Audio output: L / R
Headphone Mini-jack for stereo (3.5ø)
Table Stand Yes
Power AC100V-240V, 50/60Hz
Power Power Consumption <250W
Temperature + 0 °C ~ + 40 °C
storage - 10 °C ~ + 50 °C
Environment
operating 10% ~ 85%
Dimension W x H x D (with stand) 951 x 694 x 285 (mm)
Net weight Without accessory 23 Kg
Accessory Remote controller, Batteriesx2, Power cable, Analog VGA cable
Audio Cable, User manual

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2. Operating Instructions
2.1. The Use Of Remote Control

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TELETEXT

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2.2 To Use The Menus

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2.3 LCD TV Description
The LCD TV will contain a main board, a power board, an IR board, a key board, an IO board and an audio
Board. The main board and power board will house the flat panel to control logic I嘒C bus, DDC, brightness
control logic for LCD panel, DC-DC conversion to supply the appropriate power to the whole board and
transmitting TTL level signals into LCD Module to drive the LCD display circuit.
The inverter board will drive the CCFLs (Cold Cathode Fluorescent Tube).
The switching power board will provides the power ON/OFF to control the TV and control LED indicator for
DPMS.
The function keyboard and Remote Control will provide the OSD control signal to the Main Board.
2.4 Interface Connector
(A) Power Cord Connector.
(B) RF Signal Connector.
(C)Video / Audio Signal Connectors.
(D)PC D-sub 15 pin Connector.
(E) PC Audio Connector
(F) Composite Connector
(G)S-Video Connector
(H)HDMI Connector
(I) SCART Connector

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6. White Balance, Luminance Adjustment
Instrument List:
Chroma 2225ΕVG848ΕChroma 7120
Adjustment Process:
ķInstrument Orientation
Connect LCD-TVΕChroma 2225 and VG848, and set Timing137ΕPattern1 on Chroma2225. Chroma7120’s lens
must aim at the center of Pattern1 showed on the LCD-TV’s screen. The distance of Chroma7120’s lens and the
center of screen is 20cm1cm.
ĸENTER FACTORY
After orientation OK, set Pattern104(black picture) on Chroma225.Press 1-9-9-9 on remote to enter the menu
on top left of the screen(refer to fig.1,this menu will show slowly), then from UP key(Ϧ) option to enter the menu
(refer to fig.2).
Fig.1

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Fig.2
Fig.3
ĹPC Mode White BalanceAdjustment
Begin to adjust the W/B (White Balance) you should select the Color Temp and enter the son menu from father
menu “Scaler” refer to Fig.2 and Fig.3.
Set channel color temperature value and brightness on Chroma7120.Set 303 319 350(7200K) on CH1 and
278 289 350(10300K) on CH1.Press MODE key on Chroma7120 to switch xyY mode.
Use black sleeve on Chroma7120’s lens to ensure no external ray. Set Pattern104 on Chroma2225.Adjust
SCALAR RBΕGBΕBB value to make sure the brightness is the lowest, then set Pattern105 on Chroma2225 and

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adjust RGΕGGΕBG value to make the value displaying on Chroma7120 is about 100.Press “Save” to save. Switch
to CH1, select 10300K Temp and then adjust it according to above method. Press “Save” to save.
ĺAV MODE W/B ADJUSTMENT
Begin to adjust AV/COMPONENT YPbPr(480I/576I)/COMPONENT T-scaler(480P/720P/1080I) /HDMI W/B,
their Color Temp modes refer to Fig.4/5/6/7
Fig.4
Fig.5

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Fig.6
Fig.7
1.OFFSET(26%) W/B ADJUSTMENT(This is only for AV/TV)ΚChange the input signal to 26% white level
performance .Set the CHROMA7120 to 288 301 30 and MODE_RGB ,then adjust the TV’s RBΕGBΕBB to make
CHROMA7120 display to 100.
2.W/B ADJUSTMENT (100%): Change the input signal to 100% white level performance. Set the
CHROMA7120 to 288 301 415 and MODE_RGB , then adjust the TV’s RGΕGGΕBG to make CHROMA7120 display
to 100.
3.Save the adjustment. Then change the input signal to 26% white level performance. Set the CHROMA7120 to
MODE_RGB and CH1, check whether the color temperature was in SPEC (color spec is x±30;y±30;Y>370). In this
time, most of the TV is in SPEC, while the others should be adjusted twice or more to make its color temperature in

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SPEC.
4.CHECK CUT OFF: Change the input signal to 0% white level performance. Firstly, press the “brightness” from
50% to 0% and make sure the Y is not changed. Secondly, change the input signal to 32 GRAYS performance and
make sure the grays is not connected at any position.( as the 5% level is between the first gray and the second gray.
5%=ΰ1/32α*1.6Ζ)
1.The white color temperature in PC Mode should be app.7200K(CIE1931: x=0.303, y=0.319ΔY>350),
10300K(CIE1931 : x= 0.278, y= 0.289, Y>350 ).
2.The white color temperature inAV/TV Mode should be app. 10000K(CIE1931:x=0.280±30, Y=0.290±30,
Y>370). In this Mode,we should check the black balance,which level is 26% of the white level(1.0Vpp).
3. The white color temperature in HDTV/HDMI Mode should be app. 10000K(CIE1931:x=0.280±30,
Y=0.290±30, Y>370)
Those three channels should be factory preset and not be possible to be modified.
The measurement position is the center of the display(5) at brightness set to center and
Contrast set to max. . The tolerance of the color coordinates should be less than ± 0.030