AOC E2251FWU Service Manual
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AOC E2251FWU Service Manual

AOC E2251FWU Service Manual

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21.5" LCD Color Monitor
Service
Service
Service
Table of Contents............................................................1
Revision List........................................................2
Important Safety Notice.....................................3
1.Monitor Specification...............................................4
2.LCD Monitor Description........................................5
3.Connecting the Monitor............................................6
4.Input/Output Specification.......................................7
4.1.Input Signal Connector.........................................7
4.2.Factory Preset Display Modes................................7
.
4.3.Panel Specification...............................................8
5.Block Diagram.........................................................10
5.1.Main Board..............................................10
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

TABLE OF CONTENTS

Page
Description
6.Schematic.....................................................11
6.1.Main Board...................................................11
6.2.LED Board..............................................17
7.PCB Layout.....................................................18
7.1.Main Board.................................................18
7.2.LED Board..........................................22
8.Maintainability................................................23
8.2.Trouble Shooting..........................................24
10.Monitor Exploded View.................................27
11.BOM List...................................................29
SAFETY NOTICE
1
AOC E2251FWU
Horizontal Frequency
67.5 KHz
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Summary of Contents for AOC E2251FWU

  • Page 1: Table Of Contents

    21.5" LCD Color Monitor AOC E2251FWU Service Service Service Horizontal Frequency 67.5 KHz TABLE OF CONTENTS Description Page Description Page 6.Schematic……………........11 Table of Contents..……........…..1 6.1.Main Board………..........11 Revision List.…........……..2 6.2.LED Board...….…........17 Important Safety Notice.……....……..3 7.PCB Layout..…………........18 1.Monitor Specification......………..4 7.1.Main Board………........18 2.LCD Monitor Description……………………………..5 7.2.LED Board…........22...

  • Page 2: Revision List

    Revision List Version Release Date Revision History TPV Model Name May.24.2012 Initial release TIBMDL2ACKUNNN...

  • 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 scaler board and a led board. The scaler board houses the flat panel control logic and brightness control logic and provides DC to DC driver voltage to drive the backlight of panel and the scaler board chips each voltage.

  • Page 6: Connecting The Monitor

    3. Connecting the Monitor...

  • Page 7: Input/Output Specification

    4. Input/Output Specification 4.1 Input Signal Connector USB connectors Pin Number Assignment of 5-Pin min USB V-BUS Ground 4.2 Factory Preset Display Modes VESA MODES Horizontal Vertical Nominal Sync Nominal Sync Nominal Mode Resolution Total Frequency Polarity Frequency Polarity Clock +/- 1kHz +/- 1 Hz (MHz)

  • Page 8: Panel Specification

    4.3 Panel Specification 4.3.1 General Features M215HGJ-L2U is a 21.5” TFT Liquid Crystal Display module with WLED Backlight unit and 30 pins 2ch-LVDS interface. This module supports 1920 x 1080 Full HD mode and can display up to 16.7M colors.The converter module for Backlight is not built in.
  • Page 9 4.3.4 Electrical Characteristics LCD Electrical Specification Backlight Unit...

  • Page 10: Block Diagram

    5. Block Diagram 5.1 Main Board CRYSTAL 12MHZ Panel Interface (X401) (CN405) V/A PROCESSOR DL-165 (U401) LED Board Interface Panel Interface (CN401) (CN803)

  • Page 11: Schematic

    6. Schematic 6.1 Main Board 715G5056M0F000005I +5VIN +5VLDO +5VLDO FB702 D704 CN701 SK54B R754 127R 10 OHM 1/10W 1K 1/16W C767 R717 +3.3V JACK C766 U708 100N 16V U704 L701 Q702 AO4411 R718 NC/AO3401A 2.2uH 17.3mOHM 8.2A 0.33uF 16V PGND 10K+-5%1/16W DGND VBUS0...
  • Page 12 VBUS0 Route diff pairs to 90ohms differential impedance +3V3_PLL U401H CN702 R710 L401 90OHM RO0- RO0- ROin0- USB CONN FB701 R449 100R 1% ROin0- +3V3_PLL FPI_PLL_AVDD33 FPI_DATA_0N RO0+ R457 FPI_DATA_0P L702 90OHM USB_DN RO1- RO0+ 1K 1/16W ROin0+ ROin0+ 7 FPI_DATA_1N C426 RO1+...
  • Page 13 DDR Memory +2V6_SW +3V3 +2V6 Q403 FB405 AO3401A 120R 6A R751 C472 C476 C477 C478 C479 C480 C481 C482 C483 C484 100N 16V 100N 16V 100N 16V 100N 16V 100N 16V 100N 16V 100N 16V 100N 16V 10uF 10V 10K+-5%1/16W R419 1N 50V 1K 1/16W...
  • Page 14 Flrst place 100nF 0402 caps as close to the associated power / ground balls as possible. Then place 1uF 0603 caps as close an possible. Optional SPI Flash Add more capacitors if there is space. +3V3 U408 U401G +3V3 NC/M25P128-VMF6TG NC/220N 10V C438 VSS33...
  • Page 15 DGND ROin0- ROin0+ ROin1- RXO0- RXO0+ R402 ROin1+ RXO1- VLED_PWM 6 ROin2- RXO1+ 100OHM1/16W RXO2- ROin2+ RXO2+ CLKOIN- R406 RXOC- CLKOIN+ RXOC+ ROin3- RXO3- 4.7K 1/16W RXO3+ ROin3+ RXE0- RXE0+ REin0- RXE1- DGND REin0+ RXE1+ REin1- RXE2- REin1+ RXE2+ REin2- R403 RXEC- RXEC+...
  • Page 16 +Panel_BLED D811 SM360B R825 L811 Vout 22uH 0R05 4A 1/4W C811 C810 R811 150UF 25V 150UF 25V C812 C813 10 OHM 1/4W 0.1uF 25V 33N 50V R805 0R05OHM1/8W C815 C819 C817 C814 0.47uF 50V 10UF 50V DGND 2.2uF 25V 220P 50V R814 300KOHM 1/10W C816...

  • Page 17: Led Board

    6.2 LED Board 715G5072T01000004I CN001 BLUE CONN ZD001 LED001 MLVS0402M04 T P V ( Top Victory Electronics Co . , Ltd. ) OEM MODEL Size TPV MODEL 絬 隔 瓜 絪 腹 Key Component 2. Key board PCB NAME 715G5072 <...

  • Page 18: Pcb Layout

    7. PCB Layout 7.1 Main Board 715G5056M0F000005I...

  • Page 22: Led Board

    7.2 LED Board 715G5072T01000004I...

  • Page 23: 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 24: Trouble Shooting

    8.2 Trouble Shooting No Power No power Check the power cable Re-plug the power cable is tight? Check the USB cable is Re-plug the USB cable tight? Check the LED indicate Check the AC power is OK? Replace the adapter board and check the connections Replace main board and check connections Replace LED board and check connections...
  • Page 25 No Video (This monitor display is blank.) No Video (This monitor display is blank.) Verify the computer The end connected correctly and is not in standby? Verify the display The end drivers are installed and the icons is visible Verify the video output function is not disabled.

  • Page 26: White-Balance, Luminance Adjustment

    9. White- Balance, Luminance Adjustment It is not necessary to do the white balance adjustment.

  • Page 27: Monitor Exploded View

    10. Monitor Exploded View...
  • Page 28 Description BEZEL LENS_POWER FOOT PAD MAINFRAME REAR_COVER HINGE Part No. Description STAND COVER 0D1G1030 6120 SCREW(MAIN BOARD-MAINFRAME BASE 0Q1G 140 10120 SCREW(HINGE-BASE) PLATE_Stand 0M1G3030 6 47 CR3 SCREW(REAR COVER) FOOT 0Q1G1030 8120 SCREW(PLATE STAND-STAND COVER) PANEL Q01G6064 5A01 BT SCREW(BASE) MAIN BOARD 0M1G3030 6 47 CR3 SCREW(REAR COVER-BKT)

  • Page 29: Bom List

    PE FILM Q45G 77 5 PE PACKING (Y1900241) Q50G 4 10 TIE (Y1900221) Q52G 1185 98 MIDDLE CARTON TAPE FOR AOC 72MM E750 750GBM215GJU12N000 LCD M215HGJ-L2U C1 NB CMI 756GQBCB A1013 00 MAIN BOARD-CBPCBDLA1QN U409 056G1133140 EEPROM CAT24C128WI-GT3 128KB SO-8...
  • Page 30 A34G2713AEDA1B0130 BEZEL Q40G000461544A POP LABEL FOR E2251FWU Q40G000461547A DC-5V LABEL Q41G78S161570A E2251FWU QUICK SETUP GUIDE Q44GB11961501A00JM ARTWORK CARTON Q45G8801607 7 P.E. BAGX200X140X0.04 Q45G9901609273 P.E. BAGX500X630X0.3 E05201 Q52G1001209 A JY AL FOIL Q52G1001211 B JY AL FOIL Q52G1001211598 JY AL FOIL...
  • Page 31 U709 056G 563146 LDO G912T63U 1A 1.2V SOT-223 U707 056G 563156 IC G9141T11U SOT23-5 U703 056G 563292 DC/DC MP1542DK-LF-Z MSOP8 U708 056G 563345 DC/DC AT1528P11U 2A SOP-8 U402 056G 615921 G DRAM H5DU2562GTR-FAC 256M TSOPII-66 U801 056G 700 4 LED DRIVER MP3388DR-C280-LF-Z QFN-24 U401 056G1126 80 V/A PROCESSOR DL-165 BGA-276...
  • Page 32 R403 061G0402101 JF RST CHIPR 100 OHM +-5% 1/16W FENGHUA R457 061G0402102 JF RST CHIPR 1KOHM +-5% 1/16W FENGHUA R458 061G0402102 JF RST CHIPR 1KOHM +-5% 1/16W FENGHUA R459 061G0402102 JF RST CHIPR 1KOHM +-5% 1/16W FENGHUA R460 061G0402102 JF RST CHIPR 1KOHM +-5% 1/16W FENGHUA R488 061G0402102 JF...
  • Page 33 R440 061G0402330 JF RST CHIPR 33 OHM +-5% 1/16W FENGHUA R439 061G0402330 JF RST CHIPR 33 OHM +-5% 1/16W FENGHUA R715 061G04024301FF RST CHIP 4K3 1/16W 1% FENGHUA R702 061G04024701FF RST 0402 4.7K 1% 1/16W R712 061G04024702FF RST CHIPR 0402 47K +-1% 1/16W FENGHUA R441 061G0402472 JF RST CHIPR 4.7KOHM +-5% 1/16W FENGHUA...
  • Page 34 R720 061G1206100 JF RST CHIPR 10 OHM +-5% 1/4W FENGHUA R721 061G1206100 JF RST CHIPR 10 OHM +-5% 1/4W FENGHUA R811 061G1206100 JF RST CHIPR 10 OHM +-5% 1/4W FENGHUA R412 061G1206301 JF RST CHIPR 300 OHM +-5% 1/4W FENGHUA R413 061G1206301 JF RST CHIPR 300 OHM +-5% 1/4W FENGHUA...
  • Page 35 C444 065G040210412K CAP 0402 100NF 10% 16V X7R C420 065G040210412K CAP 0402 100NF 10% 16V X7R C419 065G040210412K CAP 0402 100NF 10% 16V X7R C418 065G040210412K CAP 0402 100NF 10% 16V X7R C417 065G040210412K CAP 0402 100NF 10% 16V X7R C416 065G040210412K CAP 0402 100NF 10% 16V X7R...
  • Page 36 C401 065G0402105A5K CAP CHIP 0402 1UF K 10V X5R C719 065G040222031J CAP CHIP 0402 22P 50V NP0 +/-5% C720 065G040222031J CAP CHIP 0402 22P 50V NP0 +/-5% C721 065G040222031J CAP CHIP 0402 22P 50V NP0 +/-5% C722 065G040222031J CAP CHIP 0402 22P 50V NP0 +/-5% C723 065G040222031J CAP CHIP 0402 22P 50V NP0 +/-5%...
  • Page 37 C705 065G080522525K CAP CHIP 0805 2.2UF K 25V X5R C707 065G080522525K CAP CHIP 0805 2.2UF K 25V X5R C819 065G080547432K CAP CHIP 0805 0.47UF K 50V X7R C455 065G0805475A2K CAP CHIP 0805 4.7UF K 10V X7R C446 065G0805475A2K CAP CHIP 0805 4.7UF K 10V X7R C437 065G0805475A2K CAP CHIP 0805 4.7UF K 10V X7R...
  • Page 38 L401 073G253S 6 T IND SMD CHOKE 90 OHM TDK L407 073G253S 6 T IND SMD CHOKE 90 OHM TDK L702 073G253S 6 T IND SMD CHOKE 90 OHM TDK L404 073G253S 6 T IND SMD CHOKE 90 OHM TDK L410 073G253S 6 T IND SMD CHOKE 90 OHM TDK...

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