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Acer AT4220A Service Manual

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Acer AT4220A LCD TV
Service Guide
Service guide files and updates are
available on the ACER/CSD web. For
more information, please refer to http:/
/csd.acer.com.tw
PRINTED IN TAIWAN

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   Summary of Contents for Acer AT4220A

  • Page 1 Acer AT4220A LCD TV Service Guide Service guide files and updates are available on the ACER/CSD web. For more information, please refer to http:/ /csd.acer.com.tw PRINTED IN TAIWAN...
  • Page 2: Revision History

    Revision History Please refer to the table below for the updates of LCD TV AT4220A service guide. Date Chapter Updates...
  • Page 3 Copyright © Copyright 2006 by Acer Incorporated. All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without the prior written permission of Acer Incorporated.
  • Page 4 Disclaimer The information in this guide is subject to change without notice. Acer Incorporated makes no representations or warranties, either expressed or implied, with respect to the contents hereof and specifically disclaims any warranties of merchantability or fitness for any particular purpose. Any Acer Incorporated software described in this manual is sold or licensed “as is”.
  • Page 5 Conventions The following conventions are used in this manual. SCREEN MESSAGES Denotes actual messages that appear on screen. NOTE Gives bits and pieces of additional information related to the current topic. WARNING Alerts you to any damage that might result from doing or not doing specific actions.
  • Page 6 Preface Before using this information and the product it supports, please read the following general information. This Service Guide provides you with all technical information relating to the BASIC CONFIGURATION decided for Acer's “global” product offering. To better fit local market requirements and enhance product competitiveness, your regional office MAY have decided to extend the functionality of a machine (e.g.
  • Page 7: Lcd Panel

    Chapter 1 System Specification Specification LCD Panel Max. resolution: 1366 x 768 • Display color: 16.7 million colors • Life time: 60,000 hours • Input signal: one-channel LVDS • Contrast ratio: 1000/1 (Min) • Brightness: 4000 Cd/m (Min) • Response time: AUO typical gray to gray Tr=8ms (Max.) •...
  • Page 8: Remote Control

    Power consumption: 291W • Stand-by: 5W Max. • Remote Control Multi-function remote control • Speaker Internal speaker: 10W x 2 • Amplifier: 10W x 2 stereo, adjustable volume • Others On-screen display adjustment function • ISP (In System Programming) function available for revising driver easily •...
  • Page 9 System Block and Wiring Diagram PANEL INVERTER I/O Board POWER MAIN Board A-Tuner Module AV 1 AV 2 Component1 Component2 SPEAKER IR Receiver Key Board Chapter 1...
  • Page 10 LCD Main Board Block Diagram Chapter 1...
  • Page 11: Lcd Tv Overview

    LCD TV Overview AT4220A/AT4220B/AT4220 Front Panel View Item Description Power On/Off Powers on or off the LCD TV. Menu key Turns the OSD menu on and off. Channel up/down Channel up: When the OSD is on, functions the same as the Up arrow.
  • Page 12 AT4220A Rear Panel View Item Item Power switch PC Audio-in AC-in AV-Audio L/R + COMPONENT 1/2 HDMI AV-Audio L/R + CVBS 1/2 VGA-in Analog antenna DVI-D Chapter 1...
  • Page 13 AT4220B Rear Panel View Item Item Power switch Audio L/R + CVBS + COMPONENT 1/2 AC-in Audio L/R + CVBS + COMPONENT 1/2 HDMI Audio L/R + CVBS 1/2 + S-Video VGA-in Analog antenna PC Audio-in Chapter 1...
  • Page 14 AT4220 Rear Panel View Item Item Power switch PC Audio-in AC-in AV-Audio L/R + CVBS + COMPONENT HDMI SCART VGA-in Analog antenna Chapter 1...
  • Page 15 Remote Control AT4220A Item Description POWER Press to turn your TV on/off. DISPLAY Press to display input/channel information (dependent on input/ source type). MUTE Press to toggle audio on and off. Input buttons (TV/AV/ Press to select correct input mode.
  • Page 16 RECALL Press to return to the previous channel. ENTER Press to confirm channel number selection. MENU Press to open or close the Menu. Press to select close caption and text service between CC1, CC2, CC3, CC4, Text1, Text2, Twxt3, Text4. Directional keys/OK VOL (up/down) CH (up/down)
  • Page 17 AT4220B Item Description POWER Press to turn your TV on/off. DISPLAY Press to display input/channel information (dependent on input/ source type). MUTE Press to toggle audio on and off. Input buttons (TV/AV/ Press to select correct input mode. COMPONENT/PC) SLEEP Press to set a time period after which the TV will switch itself to standby (15, 30, 45, 60, 90 or 120 minutes).
  • Page 18 MENU Press to open or close the Menu. TTX/MIX (TELETEXT/ Press to return to the previous channel. MIX) Directional keys/OK VOL (up/down) CH (up/down) WIDE Press to toggle scaling mode between 4:3, 16:9, Panorama and Letterbox 1, 2, 3 modes. Press to select the sound input, displayed in the top right-hand corner (mono, stereo, bilingual).
  • Page 19 AT4220 Item Description POWER Press to turn your TV on/off. DISPLAY Press to display input/channel information (dependent on input/ source type). MUTE Press to toggle audio on and off. Input buttons (TV/AV/ Press to select correct input mode. SCART/PC) SLEEP Press to set a time period after which the TV will switch itself to standby (15, 30, 45, 60, 90 or 120 minutes).
  • Page 20 Directional keys/OK VOL (up/down) CH (up/down) WIDE Press to toggle scaling mode between 4:3, 16:9, Panorama and Letterbox 1, 2, 3 modes. Press to select the sound input, displayed in the top right-hand corner (mono, stereo, bilingual). VOL (+/-) Press to increase or decrease the volume. CH (up/down) Press to sequentially select the TV channel.
  • Page 21: Basic Connection

    Basic Connection Connecting the Power Cord Connect the AC cord into the AC input on the back of the set. Connect the male plug to the wall outlet as shown. For AT4220A For AT4220B Chapter 1...
  • Page 22: Getting Started Watching Your Tv

    For AT4220 Connecting an Antenna/Cable Connect the antenna cable to the appropriate antenna terminal on the back of the TV set as shown below. Getting Started Watching Your TV Select the setup language you prefer. Chapter 1...
  • Page 23 Please select country. Ensure that your co-axial cables connected correctly before proceeding. Scan for analog channels. Setup is now complete. You are ready to begin watching TV. If you leave the setup process before it is complete, you will be given a choice of options: Resume setup.
  • Page 24 Connecting External Audio/Video Device Connecting a DVD, VCR, STB or Audio/Video Equipment Connect your DVD player, VCR or audio/video equipment using the SCART port located at the rear of your LCD TV as shown below. For AT4220A Source-IN Yellow White...
  • Page 25 For AT4220B Yellow White Blue Green Chapter 1...
  • Page 26 For AT4220 Source-IN Yellow White Blue Green Acer recommends the following priority for connection types: HDMI > COMPONENT > SCART > Note: Composite. TV-OUT SCART-out only works with analog broadcasts. Note: Chapter 1...
  • Page 27: Connecting A Pc Or Notebook Computer

    Connecting a PC or Notebook Computer To display PC output on your TV, please connect your PC or notebook computer to the TV as shown below. For AT4220A For VGA and DVI input, Acer recommends setting your PC’s external monitor resolution to Note: 1360 x 768 at 60Hz.
  • Page 28 For AT4220B For AT4220 Chapter 1...
  • Page 29: Selecting The Input Source

    Once you have connected your antenna or external equipment to the TV, you need to select the correct input source. Press the corresponding button on the remote control to select the correct input source. For AT4220A/AT4220B COMPONENT Item Input Button Guide TV key Toggle Analog TV (ATV) between input sources.
  • Page 30: Osd Navigation

    OSD Navigation Many of the advanced settings and adjustments are available through using the OSD (on-screen display) menus, as shown in the example screenshot below. Basic operations required to navigate these menus (Picture, Audio, Channel management) Navigating the OSD with the Remote Control You can also interact with these menus using the front panel controls.
  • Page 31 general settings, and Empowering Technology. For advanced settings, please refer to following page. Adjusting the Picture Quality 1. Press the MENU key to bring up the OSD. 2. Using the directional keys, select Picture from the OSD. Then navigate to the picture element you wish to adjust.
  • Page 32 Adjusting the Settings 1. Press the MENU key to bring up the OSD. 2. Using the directional keys, select Settings from the OSD. Then navigate to the feature you wish to adjust. 3. The Settings menu can be used to adjust the menu language and other important settings.
  • Page 33: Empowering Technology

    Empowering Technology Less than 2 seconds Default setting in different mode Set-up Empowering mode More than 2 seconds The Empowering Key brings up the Acer Empowering Technology functions. In TV mode, the choice is between Scenario mode and Favorite channel. Set-up Empowering Mode To change your Empowering Key’s default setting: Press and hold the Empowering Key for more...
  • Page 34 optimal enjoyment of the following scenario: Standard TV, Movie, Sport, Concert, Game, and User. Pressing the Empowering Key for less than two seconds will toggle between the different modes. Mode Information Standard Standard mode allows you to watch your favorite channels with sharp, brilliant imagery via adaptive brightness and contrast adjustments, and listen to clear-sounding audio.
  • Page 35 Navigate to a channel slot, use CH up/ down button or number key to change channel. There are a total of five slots in which you can store TV programs. Viewing Your Favorite Channels On the remote control, if you press the Empowering Key for less than two seconds, the TV will toggle between the five stored TV channels sequentially...
  • Page 36: Advanced Features

    Advanced Features PIP/PBP/POP Press the PIP/PBP button once to display activate picture-in-picture (PIP). • Press twice to activate picture-by-picture (PBP). • Press three times to activate picture-on-picture (POP). Then, the POP screens will display the TV channel • programs one by one. POP (Picture-on-Picture) PIP (Picture-in-Picture) PBP (Picture-by-Picture)
  • Page 37 1. Press the ACTIVE key to toggle between PIP screens. 2. Press the TV, AV, COMPONENT or PC keys, number keys or CH up or down to change the content of the active screen. COMPONENT 3. Press the SWAP key to change the content between the primary and the PBP screen.
  • Page 38 Lock TV Locking TV Content Lock TV is a handy feature that can block all TV sources. Lock TV allows you to enter a password and effectively stop anyone without the password from watching TV. If you want to set a personal PIN, please follow the steps below. Press the MENU key on the remote control to bring up the OSD.
  • Page 39 Hardware Specification and Configuration Electro/Optical Model AT4220A Panel specification Resolution (pixels) 1366 x 768 Brightness (tpe.) 500 nits Contrast ratio (tpe.) 1200/1 Display color 16.7 million H: 178 degrees Viewing angle V: 178 degrees Response (tpe.) 8 ms (gray to gray)
  • Page 40 Firmware Specifications Preset Mode for VGA Input 16 factory preset modes for VGA inputs are saved during the manufacturing process. Preset mode Pixel Format Hor. Freq. (kHz) Hor. Polarity Vert. Freq. (Hz) Vertical Polarity Standard 720*400 31.47 640*480 31.47 640*480 37.861 VESA 640*480...
  • Page 41 Hsync: f < 1KHz, duty cycle > 25% • Vsync: f < 10Hz, duty cycle > 25% • The power consumption is valid over the specified voltage and frequency range. Power consumption is measured from AC source. There are no power saving modes for TV, AV1, AV2, COMPONENT 1 and 2, DVI and HDMI inputs.
  • Page 42 Line Fuse The AC input shall be fused and become electrically open as a result of an unsafe current condition. This fuse is inside the power supply converter and is not user replaceable, and must be returned for replacement. This fuse shall be well-selected to handle inrush current for all combinations of line voltage and frequency.
  • Page 43 Vibration Test The packaged display shall be capable of passing sinusoidal vibration test below. Test conditions • A duration of 30 minutes in each orientation for the tested unit • Top and bottom side (z axis) • Left and right side (x axis) •...
  • Page 44 Multi Picture We only support video on graphic (VGA) multi-picture function. The configuration for multi picture is listed and described as the tables below. Main HDMI Component 1 Component 2 O : support X: not support POP(1+5,1+12) Main & Sub Screen Combination Main HDMI Component 1...
  • Page 45: General Information

    Machine Disassembly and Replacement General Information This chapter contains step-by-step procedures on how to disassemble the AT4220A for maintenance and troubleshooting. To disassemble the TV, you need the following tools: Wrist grounding strap and conductive mat for preventing electrostatic discharge •...
  • Page 46 Disassembly Procedures Release the four screws securing the TV Stand. Then remove the TV Stand as the arrows indicate. Release the two screws holding the TV Stand cover. Then remove the TV Stand cover. Release the four screws fastening the right speaker. Push the latch as the arrow indicates and disconnect the right speaker cable then remove the right speaker.
  • Page 47 Release all the screws marked in red. Then lift the TV back cover as shown. Chapter 2...
  • Page 48 Release all screws securing the PCB holder. Then remove the PCB holder as the arrows indicate. Chapter 2...
  • Page 49 Release the four screws holding the I/O board. Then detach the I/O board as the arrow indicates. At first disconnect all the cables that connect to the main board. Release the four screws fastening the main board then detach the main board. Release the eight screws fastening the power board and the grounded wire.
  • Page 50 Release the two screws holding the IR board then detach the IR board. Release the three screws holding the button board then detach the function board. Detach function key. Disconnect the LVDS cable and release the four screws holding the PCB tray. Then remove the PCB tray with LVDS cable.
  • Page 51 Release the five screws securing the right inverter bracket and the inverter board. Carefully disconnect the ten inverter backlight cables and the inverter board FFC. Then detach the right inverter board. Repeat these steps to detach the left inverter bracket and the left inverter board. Release the screws marked in red then remove the right and the left LCD brackets.
  • Page 52 Board Placement Please refer to this section to reconnect all cables when you do the assembly. Speaker cable connector: The other ends of this cable link to the two speakers. Chapter 2...
  • Page 53 LVDS cable connector: The other end of this cable links to the LVDS board. Inverter cable connector: This is a three-end cable. The other two ends link the right inverter and the power board. We define this cable as Inverter R to Power Board to Main Board. Please refer to the photos below.
  • Page 54 Main board to power board cable (eight pins and seven pins): The other end of this cable links to the power board. Main board to power board cable (14 pins and 10 pins): The other end of this cable links to the power board too.
  • Page 55 Power board to left inverter board cable: The other end of this cable links to the left inverter board. Please refer to the photos below. Chapter 2...
  • Page 56 Chapter 2...
  • Page 57: Troubleshooting

    Chapter 3 Troubleshooting Use the following procedure as a guide for Acer LCD TV AT4220A problems. The diagnostic tests are intended to test this model. Non-Acer products, prototype cards, or Note: modified options could occur false errors and invalid system responses.
  • Page 58 Symptoms Can Not Power on Power code Power code Power code Check Power code Check Power code Check Power code Plug in? Plug in? Plug in? Replace Power board or Main board Replace Power board or Main board Replace Power board or Main board LED Bright? LED Bright? LED Bright?
  • Page 59 LCD No Backlight Inverter power Inverter power Change Inverter Change Inverter Cable had Plug in Cable had Plug in Power Cable Power Cable LCD Panel Backlight LCD Panel Backlight Replacement Power/B Replacement Power/B Bright ? Bright ? LCD Panel Backlight LCD Panel Backlight Bright ? Bright ?
  • Page 60 Remote Control No Function Remote Control have Change Battery battery? Check IR/B cable or IR Board Cable plug in Replacement IR/B Cable Press Remote Menu Key Replacement IR/B OSD can Display? Press Remote Menu Key Replacement M/B OSD can Display? Chapter 3...
  • Page 61 Button Keys No Function Key Board Cable Check K/B cable or plug in Replacement K/B Cable Press Menu Key check Replacement K/B Cable have Function? Press Menu Key check Replacement K/B Cable have Function? Chapter 3...
  • Page 62 RF No Display RF Cable RF Cable Check RF cable or Check RF cable or plug in plug in Replacement RF Cable Replacement RF Cable Replacement I/O board Replacement I/O board Replacement M/B Replacement M/B RF Can Display RF Can Display Chapter 3...
  • Page 63 COMPONENT1 and COMPONENT2 No Display Check Component cable Component Cable or Replacement plug in? Component Cable Replacement I/O Board Component cat display Replacement M/B Board Chapter 3...
  • Page 64 AV1 and AV2 No Display Check CVBS cable or CVBS Cable Replacement CVBS plug in? Cable Replacement I/O Board CVBS cat display Replacement M/B Board Chapter 3...
  • Page 65 Speaker No Sound Audio R/L source Audio R/L source Check Audio R/L Check Audio R/L had plug IN? had plug IN? source cable source cable Check Video cable or Check Video cable or Video can Display ? Video can Display ? Replacement Video Cable Replacement Video Cable Mute turn off...
  • Page 66 VGA No Display Check VGA cable or VGA Cable Replacement VGA plug in? Cable Read EDID DATA EDID Data Normal? Write EDID data VGA can display? Replacement M/B Chapter 3...
  • Page 67 DVI No Display DVI Cable Check DVI cable or plug in? Replacement DVI Cable Read EDID DATA EDID Data Normal? Write EDID data DVI can display? Replacement M/B Chapter 3...
  • Page 68 HDMI No Display Check HDMI cable or HDMI Cable Replacement HDMI plug in? Cable Read EDID DATA EDID Data Normal? Write EDID data HDMI can display? Replacement M/B Chapter 3...
  • Page 69 HDMI No Sound HDMI Cable HDMI Cable Check HDMI cable or Check HDMI cable or plug in ? plug in ? Replacement HDMI CABLE Replacement HDMI CABLE Read EDID DATA Read EDID DATA EDID Data EDID Data Write EDID data Write EDID data Normal ? Normal ?
  • Page 70 VGA/DVI No Sound PC/DVI can Display ? Check Video cable or PC or Replacement VGA/DVI cable Mute turn off Volume set to 50 Audio Line in Check Line in cable or Cable Plug IN? Replacement Line in Cable Sound Normal ? Sound Normal ? Replacement Main/B Replacement Main/B...
  • Page 71 COMPONENT No Sound Check Component cable Component Cable or Replacement plug in? Component Cable Mute turn-off Volume =30 Earphone remove Check Component cable Component Source or Replacement can Display? Component Cable Component Sound Replacement IO/B Normal? Component Sound Normal? Chapter 3...
  • Page 72 AV1/S-Video No Sound Check Video and R-L AV1/S-Video/R-L cable or Replacement Cable plug in? Video or R-L Cable Mute turn-off Volume =30 Earphone remove Check Video and R-L AV1/S-Video Source cable or Replacement can Display? Video or R-L Cable AV1/S-Video Sound Replacement IO/B Normal? AV1/S-Video Sound...
  • Page 73 Chapter 4 FRU (Field Replaceable Unit) List This section gives you the FRU (Field Replaceable Unit) list in global configurations of AT4220A. Please refer to this chapter whenever ordering for parts to repair or for RMA (Return Merchandise Authorization). Please note that WHEN ORDERING FRU PARTS, you should check the most up-to-date information available on your regional web or channel.
  • Page 74 Parts Partname Description Acer Part No. Accessory REMOTE CONTROLLER - EU REMOTE CONTROL EURT54BEACQT1 25.M25V7.001 REMOTE CONTROLLER - USA REMOTE CONTROLLER (EURT54BCACQT1) 25.M28V7.001 REMOTE CONTROLLER - AUS REMOTE CONTROLLER (EURT54BAACQT1) 25.M38V7.001 Board POWER BOARD "PWR 291W,DPS-291AP A(90~264VAC)" 55.M34V7.001 IR BOARD JL7 IR/B ASSY(FOR HV7) 55.M25V7.003 FUNCTION BOARD...
  • Page 75 STAND ASSY HV4 STAND ASSY 60.M34V7.003 STAND COVER "STAND COVER HX4(EAHX4004,REV3B)" 42.M34V7.001 STAND BRACKET "STAND BKT HX4(FAHX4008,REV3A)" 33.M34V7.001 LCD BRACKET - L "PANEL BKT AUO L HX4(FAHX4005,REV3C)" 33.M34V7.002 LCD BRACKET - R "PANEL BKT AUO R HX4(FAHX4004,REV3C)" 33.M34V7.003 MAIN PCB TRAY "CHASSIS HX4(FAHX4001,REV3B)"...
  • Page 76 SCREW M4*6 P (NI) SCREW M4*6 P (NI) 86.M01V7.002 SCREW M4*22- SCREW M4*22-B(BNI+WASHER+SPRING) 86.M34V7.002 B(BNI+WASHER+SPRING) SCREW T4*12-B(BNI) SCREW T4*12-B(BNI) 86.M25V7.003 "NUT IO "NUT IO EA1(MBEA1001,REV3D)" 86.M25V7.001 EA1(MBEA1001,REV3D)" SCREW T3*8-B(BNI) SCREW T3*8-B(BNI) 86.M08V7.007 SCREW M3*6-B(BNI) SCREW M3*6-B(BNI) 86.M08V7.003 SCREW F3.0*6-B(NI) SCREW F3.0*6-B(NI) 86.M25V7.002 Chapter 4...
  • Page 77 Exploded Diagram of AT4220A Please refer to the following table and exploded diagram. Partname Description Acer Part No. Q’TY FRONT BEZEL ASSY HV4 LCD-BEZEL ASSY 60.M34V7.001 LCD TFT 42.0 IN. AU "LCD(TFT)42"" T420XW01 VER0" 56.M34V7.001 T420XW01 VER0 "CLAMP AUO-R/L "CLAMP AUO-R/L 47.M34V7.001...
  • Page 78 FUNCTION KEY "FUNCTION KEY 42.M25V7.001 HV7E(EBHV7001,REV3A)" WIRE SADDLE CHA-4 "WIRE SADDLE CHA-4 42.M03V7.012 VV3(EBVV3006,REV3A)" WIRE SADDLE MWS-7 "WIRE SADDLE MWS-7 42.M03V7.013 VV3(EBVV3010,REV3A)" SCREW T3*12-P (BNI) SCREW T3*12-P (BNI) 86.M34V7.001 Chapter 4...

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