AOC 919sz Service Manual

							19 LCD Color Monitor                                      AOC 919Pz&919Sz&919Vz 
 
Service 
Service 
Service
                                                              
 
 
                                                                                          
 
919Pz               919Sz&919Vz 
         
                       
                           
 
Horizontal Frequency 
                                                                                     30-80 KHz 
Table of Contents 
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 VOLTAGES. 
 
Table of Contents.......……..............................……........1
Revision List.…........................................…………........2
Important Safety Notice.……............................……......3
1.Monitor Specification..............................………..........4
2.LCD Monitor Description……………………………......6
3.Operation Instruction…………...............……..............7
3.1.General Instructions...........................…...................7
3.2.Control Button…………….…..............……...............7
3.3.OSD Menu…………….…...........................…...........9
4.Input/Output Specification............……………............13
4.1.Input Signal Connector............………….................13
4.2.Factory Preset Display Modes…….........................14
4.3.Panel Specification.....………...…………................15
5.Block Diagram…….....................………….................17
5.1.Main Board…….…………...………………....….......17
5.2.Power Board……………..……………...….......18
6.Schematic……………........................................19
6.1.Main Board………...........................................19
6.2.Power Board...…….........................................23
6.3.Key Board...…….............................................26
7.PCB Layout..………….......................................27
7.1.Main Board………...........................................27
7.2.Power Board…...............................................30
7.3.Key Board…………….....................................32
8.Maintainability……….........................................33
8.1.Equipments and Tools Requirement...............33
8.2.Trouble Shooting…………..............................34
9.White-Balance, Luminance Adjustment.............38
10.Monitor Exploded View………..…….…............40
11.BOM List…………………………………............44
 
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING 
 
						

							 
 
2
Revision List 
Version  Release Date  Revision History Customer Model  TPV Model Name 
A00 Sep.16.2010 Initial release 919Pz T9AHMJDBK1K3DN 
T9AHMJDMKASDDN 
919Sz T9AHMJDBK1KPAN 
T9AHMJDMK1SDAN 
919Vz T9AHMJDBK1K2DN 
T9AHMJDLK13ADN 
A01  Nov.08.2010  Add new model  919Vz  T9AHMJDTKA1RDN 
A02  Dec.02.2010  Add new model  919Vz  T9AHMJDLK13ADN 
A03  Dec.14.2010  Add new models919Pz T9AGMJDBKNK3DN 919Sz T9AGMJDBKMKPAN 
919Vz T9AGMJDBKMK2DN 
A04  Jan.18.2011  Add new model 
919Vz T9AGMJDEKM6ADN 
A05  Jan.27.2011  Add new model 
919Vz T9AHMJDEK16ADN 
A06  Mar.29.2011  Add new model  919Vz  T9AGSODLKM3ADN 
A07 Jul.20, 2011 Add new models919PZ T9BMSODBKNK3DN 
919Vz T9AGSODEKMACDN 
T9BMSODBKAK2DN 
T9BMSODEKM6ADN 
T9BMSODLKM3ADN 
A08  Sep.15.2011  Add new model  919SZ  T9BMSODBKMKPAN 
A09  Nov.18,2011  Add new models919VZ T9BMSODTKM1RDN 
919VZ T9AGMJDBKMK2D6 
        
        
        
        
        
        
 
						

							 
 
3
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.   
 
WA R N I N G  
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 MANUFACTURERS 
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.) 
 
 
 
 
 
						

							 
 
4
1. Monitor Specifications 
LCD Panel   
Model number   919Pz
Driving system   TFT Color LCD   
Viewable Image Size 48.3cm diagoanl 
Pixel pitch   0.294mm(H) x 0.294mm(V) 
Video  R, G, B Analog lnterface & Digital Interface 
Separate Sync.   H/V TTL 
Display Color   16.7M Colors   
Dot Clock   135 MHz   
Resolution  
Horizontal scan range   30 kHz - 80 kHz 
Horizontal scan Size(Maximum) 376.32mm  
Vertical scan range   55 Hz - 75 Hz   
Vertical scan Size(Maximum)   301.056mm  
Optimal preset resolution   1280 x 1024 (60 Hz) 
Highest preset resolution   1280 x 1024 (75 Hz)   
Plug & Play   VESA DDC2B/CI   
Input Connector   D-Sub 15pin & DVI-D   
Input Video Signal   Analog: 0.7Vp-p(standard), 75 OHM, Positive & DVI-D 
Digital Interface (TMDS)   
Power Source   100~240VAC, 50/60Hz   
Power Consumption   Active < 37 W   
Standby 
						

							 
 
5
LCD Panel   
Model number   919Sz&919Vz
Driving system   TFT Color LCD   
Viewable Image Size 48.3cm diagoanl 
Pixel pitch   0.294mm(H) x 0.294mm(V) 
Video  R, G, B Analog lnterface (for 919Sz) 
R, G, B Analog lnterface & Digital Interface(for 919Vz)
Separate Sync.   H/V TTL 
Display Color   16.7M Colors   
Dot Clock   135 MHz   
Resolution  
Horizontal scan range   30 kHz - 80 kHz 
Horizontal scan Size(Maximum)   376.32mm  
Vertical scan range   55 Hz - 75 Hz   
Vertical scan Size(Maximum)   301.056mm  
Optimal preset resolution   1280 x 1024 (60 Hz) 
Highest preset resolution   1280 x 1024 (75 Hz)   
Plug & Play   VESA DDC2B/CI   
Input Connector   D-Sub 15pin (for 919Sz) 
D-Sub 15pin & DVI-D (for 919Vz) 
Input Video Signal   
Analog: 0.7Vp-p(standard), 75 OHM (for 919Sz) 
Analog: 0.7Vp-p(standard), 75 OHM, Positive & DVI-D 
Digital Interface (TMDS) (for 919Vz) 
Power Source   100~240VAC, 50/60Hz   
Power Consumption   Active < 37 W   
Standby < 1 W   
Speakers 2 x 1W 
Physical 
Characteristics  
Connector Type   15-pin Mini D-Sub & DVI-D (DVI-D for 919Vz) 
Signal Cable Type   Detachable  
Dimensions & Weight:       
Height (with base)   409.5 mm 
Width  409 mm 
Depth  210 mm 
Weight (monitor only)   3.78 kg 
Weight (with packaging)   5.32 kg 
Environmental  
Temperature:      
Operating  0° to 40°   
Non-Operating  -25°to 55° 
Humidity:      
Operating  10% to 85% (non-condensing)   
Non-Operating  5% to 93% (non-condensing)   
Altitude:      
Operating  0~ 3658m (0~ 12000 ft )   
Non-Operating  0~ 12192m (0~ 40000 ft )   
 
						

							 
 
6
2. LCD Monitor Description 
The LCD monitor will contain a main board, a power board and a key board which house the flat panel control logic, 
brightness control logic and DDC. 
The power board will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips 
each voltage. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Monitor Block Diagram 
AC-IN 
100V-240V
 
Power Board 
(Include: adapter, inverter, audio) 
Flat Panel and 
CCFL backlight
Main Board RS232 Connector 
For white balance 
adjustment in factory 
mode
 
CCFL Drive.
Video signal, DDC
HOST Computer 
Key Board 
 
						

							 
 
7
3. Operating Instructions 
3.1 General Instructions 
Press the power button to turn the monitor on or off. The other control knobs are located at front panel of the monitor. 
By changing these settings, the picture can be adjusted to your personal preferences. 
* The power cord should be connected. 
* Press the power button to turn on the monitor. The power indicator will light up.   
3.2 Control Buttons 
For 919Pz 
 
 
1 Source(Auto) / Exit   
2 Eco mode / -   
3. Volume / + 
4. Menu / Enter 
5. Power Button & Indicator 
 
 
 
 
 
 
 
 
 
 
 
 
 
						

							 
 
8 For 919Sz&919Vz 
 
 
1 Source(Auto) / Exit   
2 Eco mode / -   
3. Volume / + 
4. Menu / Enter 
5. Power Button & Indicator
 
						

							 
 
9
3.3 OSD Menu 
•  Press the MENU-button to activate the OSD window.   
•  Press+ or - to navigate through the functions. Once the desired function is highlighted, press the 
MENU-button to activate it.If the function selected has a sub-menu, press + or - again to navigate through 
the sub-menu functions.Once the desired function is highlighted, press MENU-button to activate it.   
•  Press+ or - to change the settings of the selected function. To exit and save, select the exit function. If you 
want to adjust any other function, repeat steps 2-3.   
•  OSD Lock Function: To lock the OSD, press and hold the Menu button while the monitor is off and then 
press power button to turn the monitor on. To un-lock the OSD - press and hold the Menu button while the 
monitor is off and then press power button to turn the monitor on. 
•  Eco Mode hot key: Press the Eco key continuously to select the Eco mode of brightness when there is no 
OSD (Eco mode hot key may not be available in all models). 
•  Volume adjustment hot key: When there is no OSD, press Volume (+) to active volume adjustment bar, 
press - or + to adjust volume (Only for the models with speakers).   
•  Source hot key : When the OSD is closed, press Auto/Source button will be Source hot key function (Only 
for the models with dual or more inputs) .Press Source button continuously to select the input source 
showed in the message bar , press Menu/Enter button to change to the source selected.   
•  Auto configure hot key: When the OSD is closed, press Auto/Source button continuously about 2 second to 
do auto configure.   
 
 
 
 
 
 
						

							 
 
10 Function Control Illustration 
 
Luminance  Adjust Range   Description  
Brightness  0-100  Backlight Adjustment   
Contrast  0-100  Contrast from Digital-register. 
Eco mode   
 
 
 
  
Standard 
  
Standard Mode   
  
Text 
  
Text Mode 
  
Internet 
  
Internet Mode 
  
Game 
  
Game Mode   
  
Movie 
  
Movie Mode 
  
Sports 
  
Sports Mode 
Gamma  
Gamma1 Adjust to Gamma1 
Gamma2 Adjust to Gamma 2 
Gamma3 Adjust to Gamma 3   
DCR  
Off 
  
Disable dynamic contrast ratio 
On 
  
Enable dynamic contrast ratio 
 
Image Setup     
Clock  0-100  Adjust picture Clock to reduce 
Vertical-Line noise.   
Phase 0-100  Adjust Picture Phase to reduce 
Horizontal-Line noise   
H.Position  0-100  Adjust the vertical position of the 
picture.