AOC E2050SD Service Manual
AOC E2050SD Service Manual

AOC E2050SD Service Manual

20 lcd monitor
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20" LCD Monitor
Table of Contents....................................................1
Revision List...................................................................2
Important Safety Notice.................................................3
1.Monitor Specification...................................................4
2.LCD Monitor Description.........................................5
3.Operation Instruction.................................................6
3.1.General Instructions..................................................6
3.2.Control Buttons and Connections...............................6
3.3.OSD Setting.............................................................8
4.Input/Output Specification.......................................26
4.1.Input Signal Connector..........................................26
4.2.Preset Display Modes...... ..........................27
4.3.Panel Specification...........................................28
5.Block Diagram..........................................................32
5.1.Main Board.....................................................32
5.2.Power Board..................................................33
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
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING
R FOR TH
UNIT WHEN S

Table of Contents

Page Description
SAFETY NOTICE
EQUIPMENT CONTAINING HIGH VOLTAGES.
6.Schematic..........................................................34
6.1.Main Board.......................................................34
6.2.Power Board....................................................39
6.3.Key Board....................................................41
7.PCB Layout.........................................................42
7.1.Main Board......................................................42
7.2.Power Board.....................................................44
7.3.Key Board........................................................46
8.Maintainability.....................................................47
8.2.Trouble Shooting.............................................48
10.Monitor Exploded View.....................................54
11.BOM List......................................................55
AOCe2050Sd
Horizontal Frequency
30 - 83kHz
Page

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Summary of Contents for AOC E2050SD

  • Page 1: Table Of Contents

    20" LCD Monitor AOCe2050Sd Horizontal Frequency 30 - 83kHz Table of Contents Description Page Description Page Table of Contents…………………..…………………..…...1 6.Schematic…………..….........34 Revision List.…...........……..2 6.1.Main Board..…….…...........34 Important Safety Notice.….…......……..3 6.2.Power Board..……….........39 1.Monitor Specification......………....4 6.3.Key Board..……….........41 2.LCD Monitor Description……….……………………..5 7.PCB Layout..………..........42 3.Operation Instruction.…………....……...6 7.1.Main Board………..…........42 3.1.General Instructions........…...6 7.2.Power Board….…..........44...
  • Page 2: Revision List

    Revision List Version Release Date Revision History TPV Model Name Initial release TACSN26GAGA2HNE Aug.-02-2012...
  • Page 3: Important Safety Notice

    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.
  • Page 4: Monitor Specification

    1.Monitor Specifications...
  • Page 5: Lcd Monitor Description

    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 part will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage.
  • Page 6: Operation Instruction

    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 (See Figure ). By changing these settings, the picture can be adjusted to your personal preferences. * The power cord should be connected.
  • Page 7 1. Power 2. Analog (DB-15 VGA cable) 3. DVI To protect equipment, always turn off the PC and LCD monitor before connecting. 1 Connect the power cable to the AC port on the back of the monitor. 2 Connect one end of the 15-pin D-Sub cable to the back of the monitor and connect the other end to the computer's D-Sub port.
  • Page 8: Osd Setting

    3.3 OSD Setting Basic and simple instruction on the control keys. 1) Press the MENU-button to activate the OSD window. 2) Press - or + to navigate through the functions. Once the desired function is highlighted, press the MENU-button to activate it.
  • Page 9 Luminance Press (Menu) to display menu. Press to select (Luminance), and press to enter. Press to select submenu, and press to enter. Press to adjust.
  • Page 10 Press two times to exit.
  • Page 11 Image Setup Press (Menu) to display menu. Press to select (Image Setup), and press to enter. Press to select submenu, and press to enter. Press to adjust.
  • Page 12 Press two times to exit.
  • Page 13 Color Setup Press (Menu) to display menu. Press to select (Color Setup), and press to enter. Press to select submenu, and press to enter. Press to adjust.
  • Page 14 Press two times to exit.
  • Page 15 Color Setup Press (Menu) to display menu. Press to select (Color Setup), and press to enter. Press to select submenu, and press to enter. Press to adjust.
  • Page 16 Press two times to exit.
  • Page 17 Picture Boost Press (Menu) to display menu. Press to select (Picture Boost), and press to enter. Press to select submenu, and press to enter. Press to adjust.
  • Page 18 Press two times to exit.
  • Page 19 OSD Setup Press (Menu) to display menu. Press to select (OSD Setup), and press to enter. Press to select submenu, and press to enter. Press to adjust.
  • Page 20 Press two times to exit.
  • Page 21 Extra Press (Menu) to display menu. Press to select (Extra), and press to enter. Press to select submenu, and press to enter.
  • Page 22 Press to adjust. Press two times to exit.
  • Page 23 Exit Press (Menu) to display menu. Press to select (Exit), and press to enter. Press two times to exit...
  • Page 24 Orange or red e-Saver Welcome to use AOC e-Saver monitor power management software! The AOC e-Saver features Smart Shutdown functions for your monitors, allows your monitor to timely shutdown when PC unit is at any status (On, Off, Sleep or Screen Saver);...
  • Page 25 Screen+ Welcome to "Screen+" software by AOC, Screen+ software is a desktop screen splitting tool, it splits the desktop into different panes, each pane displays a different window. You only need to drag the window to a corresponding pane, when you want to access it.
  • Page 26: Input/Output Specification

    4. Input/Output Specification 4.1 Input Signal Connector...
  • Page 27: Preset Display Modes

    .2 Preset Display Modes...
  • Page 28: Panel Specification

    4.3 Panel Specification 4.3.1 General Features LTM200KT10 is a color active matrix liquid crystal display (LCD) that uses amorphous silicon TFT(Thin Film Transistor) as switching components. This model is composed of a TFT LCD panel, a driver circuit and a back light unit. The resolution of a 20”...
  • Page 29 Back Light Unit Ta=25 ± 2° C...
  • Page 30 4.3.4 Optical Characteristics (Ta = 25 ± 2° C, VDD=5V, fv= 60Hz, fDCLK=59.2MHz, If=240mA)
  • Page 32: Block Diagram

    5. Block Diagram 5.1 Main Board 04.SCALER 02.INPUT VCC3.3 VCC3.3 SOG_DET VCC1.8 SOG_DET SOG_DET VCC1.8 05.PANEL INTERFACE EDID_WP AHS0 EDID_WP AHS0 AHS0 AVS0 AVS0 AVS0 PA[0..9] DDCSDA1 DDCSDA1 DDCSDA1 PA[0..9] PA[0..9] DDCSCL1 DDCSCL1 DDCSCL1 VGA_CABLE_DET VGA_CABLE_DET VGA_CABLE_DET PB[0..9] 02.D-SUB INPUT PB[0..9] PB[0..9] EDID_WP...
  • Page 33: Power Board

    5.2 Power Board AC input Transformer Rectifier Bridge 14.5V EMI filter (T901) diodes Rectifier and Filter Start Resistor (R908,R911) Feedback PWM Control Circuit Power Switch LD7576AGR (U901) (Q901) Regulator Photo coupler (U902) (IC903) L801 D801 14.5V C809 MOSFET (Q801) (CN803) PWM Control ON/OFF OZ9998BGN...
  • Page 34: Schematic

    6. Schematic 6.1 Main Board 715G4502M01000004I CN101 DET_VGA VGA_CABLE_DET R102 100R 1/16W 5% VGA_CABLE_DET 5 D-SUB 15P VGA_5V DDCSCL1 R101 DDCSCL_A DDCSCL1 100R 1/16W 5% VGA_5V VSIN0 BIN0- HSIN0 BIN0 R103 R104 R105 C102 GIN0- ZD101 BIN0 0R05 1/16W 0R05 1/16W 100R 1/16W 5% 47N16V B0+ 5...
  • Page 35 CN102 R127 DVI_CABLE_DET 5 JACK 100R 1/16W 5% DVI5V 3,5,7 VSY NC DET_DVI DVI5V SY NC GND SCL_DVI R128 100R 1/16W 5% D102 DDC SCL SDA_DVI R129 100R 1/16W 5% ESD_DVI BAV70 DDC SDA DVI5V R130 1K 1/16W 5% U104 Q101 ESD_DVI ESD_DVI...
  • Page 36 VCC1.8 U401 NT68660FG FB401 and FB402 is VCC1.8 7 PB[0..9] R402 NC/2K2 1/16W 5% NC==>3.3V use TO252 type PB[0..9] LVB3P FB401 R403 NC/2K2 1/16W 5% CVDD LVB3M 300OHM U401 NT68660UFG FB402 is NC==>3.3V LVBCKP LVBCKM VCC3.3 and 1.8V LDO use SOT-223 type LVB2P C401 C402...
  • Page 37 PA[0..9] PB[0..9] PA[0..9] PB[0..9] LVB3P CN408 LVA3P LVB3M CONN LVA3M LVBCKP LVB0M RXO0- LVACKP LVBCKM LVB0P RXO0+ LVACKM LVB2P LVB1M RXO1- LVA2P LVB2M LVB1P RXO1+ LVA2M LVB1P LVB2M RXO2- LVA1P LVB1M LVB2P RXO2+ LVA1M LVB0P LVA0P LVB0M LVBCKM RXOC- LVA0M LVBCKP RXOC+ LVB3M...
  • Page 38 VCC3.3 CN702 U701 AZ1117H-3.3TRG1 FB701 0 OHM +-5% 1/8W 3,4,5 VCC3.3 5 INPUT OUTPUT VCC3.3 ADJ/GND ON/OFF NC/CONN C701 R702 4K7 1/16W 5% 100N 16V +5V 3,4,5 CN701 R703 100R 1/16W 5% Adj_BACKLIGHT 5 C706 U702 VCC3.3 100N 16V C705 NC/G1117-33T43UF 100uF16V ON/OFF...
  • Page 39: Power Board

    6.2 Power Board 715G4744P01003001M R929 100 OHM 1/4W BD901 C916 C928 F801 KBP208G R930 100 OHM 1/4W 2N2 500V 2N2 500V 0R05 1/4W +14.5V R903 100 OHM 1/4W R904 ZD901 250OHM2W MTZJ T-72 16B 80GL22T-3 C918 680UF/25V T901 D901 POWER X'FMR SR515 R905 470OHM +-5% 1/8W...
  • Page 40 FB802 D801 L801 CN803 +14.5V C801 47UH BEAD Q801 330uF 25V R804 C814 SK310B 100N 50V 10 OHM 1/8W APM8005KCTRG R801 C810 R815 10K 1/8W 0.47UF 50V R819 R820 R821 R822 160K 1/8W NC/CONN ON/OFF R814 R802 10 OHM 1% 1/4W C809 R805 300K 1/8W...
  • Page 41: Key Board

    6.3 Key Board 715G4747K02000001C LED001 CN001 LBADC1 R001 2KOHM 1% 1/10W LBADC2 DC_POWERON R002 0R01 1/10W LED_1# LED_2# C001 C002 R003 2KOHM 1% 1/10W R004 1K 1/10W NC/0.1uF 50V NC/0.1uF 50V Wire Harness SGND SW005 SW004 SW003 SW002 SW001 AUTO(2.0K) 1.118V LBADC1 DOWN...
  • Page 42: Pcb Layout

    7. PCB Layout 7.1 Main Board 715G4502M01000004I...
  • Page 44: Power Board

    7.2 Power Board 715G4744P01003001M...
  • Page 46: Key Board

    7.3 Key Board 715G4747K02000001C...
  • Page 47: Maintainability

    8. Maintainability 8.1 Equipments and Tools Requirement Voltmeter. Oscilloscope. Pattern Generator. DDC Tool with an IBM Compatible Computer. Alignment Tool. LCD Color Analyzer. Service Manual. User Manual.
  • Page 48: Trouble Shooting

    8.2 Trouble Shooting 1. No Power No power Check power cable is Re-plug the power cable tightened? Check Power “On/Off” Turn on the Power “On/Off” switch is “On”? Check the LED Check the AC power indicate is OK? Replace the converter board Replace main board and check connections Replace key board and check connections...
  • Page 49 2. No Video (Power LED Blue) No Video (Power LED Blue) Press the power Replace the main board button is OK? Replace the converter The end board Replace the main The end board and connection Replace the LVDS/FFC Check the LVDS/FFC cable or panel cable or panel Replace the key board...
  • Page 50 3. DIM DIM (image overlap, focus or flicker) The end Reset in factory mode Set to the optimal The end frequency, select the recommended frequency Readjust the phase and pixel The end clock in the user mode Pull out signal cable and Check the signal cable check “Self Test Feature and the PC...
  • Page 51 4. Color is not optimal Color is not optimal Color shift Miss color Reset the factory mode Replace the signal cable In the user mode, set the” color settings” until customer satisfy The end Pull out the signal cable and check the screen color display is normal? Replace the signal cable or PC Replace the main board...
  • Page 52: White-Balance,Luminance Adjustment

    9.White- Balance, Luminance Adjustment Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment. How to setting MEM channel you can reference to chroma 7120 user guide or simple use “SC” key and “NEXT” Key to modify xyY value and use “ID” key to modify the TEXT description Following is the procedure to do white-balance adjust .
  • Page 53 C. Adjust Cool (9300K) color-temperature 1. Switch the Chroma-7120 to RGB-Mode (with press “MODE” button) 2. Switch the MEM. Channel to Channel 9 (with up or down arrow on chroma 7120) 3. The LCD-indicator on chroma 7120 will show x=283±20,y=297±20 4.
  • Page 54: Monitor Exploded View

    10. Monitor Exploded Views...
  • Page 55: Bom List

    PRC AP ID LABEL H40G 45762413B P/N LABEL FOR BASE H41G78D161505B WARRANTY CARD AP H44GA016101 CUSHION-T H44GA016201 CUSHION-B H44GA01661507A00HX ARTWORK CARTON E2050SD H45G 87 18 23 EPE COVER H52G1801 16006 insulating sheet H70G20C161506A CD MANUAL E2050SD KEPCAHB5 KEY BOARD PLPCBA481SHD1...
  • Page 56 E09501 S95G179T30PE37 FFC CABLE 30P 175mm 1.0MM H40G000261553A TCO'05 EPA LABEL 756GHCCB0A50700001 MAIN BOARD-CBPCAN2A1H2 SMTCB-U402 100GANSA003W11 MCU ASSY-056G2233 11 CN402 033G3802 6B Y WAFER CN701 033G3802 9B Y CONN 2.0 9P CN408 033G801930F CH FFC CONN 1.0mm 30P R/A 34mm 6mm CN101 088G 35315FVCL D-SUB CONN V/T 15P BLUE H=10.4...
  • Page 57 055G 23524 WELDING FLUX WITHOUT PB Q51G 6 4509 GLUE_RTV Q55G 100625 TIN STICK_LOW ARGENTUM U901 056G 379529 AC/DC CONVERTER IC LD7576AGR SOP-7 U801 056G 700 11 LED DRIVER OZ9998BGN-A1-0-TR SOP-16 Q801 057G 763 92 FET P8008HV 4A/80V SOP-8 R811 061G0805000 JF RST CHIPR 0 OHM +-5% 1/8W FENGHUA R819...
  • Page 58 C812 065G080510131J CAP CHIP 0805 100PF J 50V NPO C813 065G080510131J CAP CHIP 0805 100PF J 50V NPO C923 065G080510232K CAP 0805 1000PF 10% 50V X7R C803 065G080510232K CAP CHIP 0805 1N 50V X7R +/-10% C815 065G080510232K CAP CHIP 0805 1N 50V X7R +/-10% C906 065G080510232K CAP CHIP 0805 1N 50V X7R +/-10%...
  • Page 59 R904 061G152M25152T SY RST MOF 250R 5% 2W R924 061G152M47852T SY RST MOFR 0.47 OHM +-5% 2WS FUTABA C911 065G 2K152 2T6921 CAP CER 1500pF K 2KV Y5P C805 065G250K1052HT CAP CER 1UF 10% 25V X7R C902 065G305M1023WR CAP Y2 1NF 20% 250V Y5U C903 065G305M1023WR CAP Y2 1NF 20% 250V Y5U...
  • Page 60 R409 061G0402000 JT RST CHIPR MAX0R05 1/16W TZAI YUAN R407 061G0402000 JT RST CHIPR MAX0R05 1/16W TZAI YUAN R406 061G0402000 JT RST CHIPR MAX0R05 1/16W TZAI YUAN R118 061G0402000 JT RST CHIPR MAX0R05 1/16W TZAI YUAN R117 061G0402000 JT RST CHIPR MAX0R05 1/16W TZAI YUAN R110 061G0402000 JT RST CHIPR MAX0R05 1/16W TZAI YUAN...
  • Page 61 R411 061G0402222 JT RST CHIP 2K2 1/16W 5% TZAI YUAN R413 061G0402222 JT RST CHIP 2K2 1/16W 5% TZAI YUAN R719 061G0402223 JT RST CHIP 22K 1/16W 5% TZAI YUAN R701 061G0402223 JT RST CHIP 22K 1/16W 5% TZAI YUAN R454 061G0402223 JT RST CHIP 22K 1/16W 5% TZAI YUAN...
  • Page 62 C402 065G040210412K CAP 0402 100NF 10% 16V X7R C403 065G040210412K CAP 0402 100NF 10% 16V X7R C405 065G040210412K CAP 0402 100NF 10% 16V X7R C408 065G040210412K CAP 0402 100NF 10% 16V X7R C409 065G040210412K CAP 0402 100NF 10% 16V X7R C410 065G040210412K CAP 0402 100NF 10% 16V X7R...

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