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Acer H235H
Service Guide
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Service Guide Version and Revision Version Release Date Revision History Customer model TPV model HD9SA6MK8XAYDC A00 May.-13-2009 Initial Release H235H HD9GA6MK8XABDC 2
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Copyright Copyright © 2003 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. Disclaimer The information in this guide is subject to change without notice. Acer Incorporated makes n
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Preface Before using this information and the product it supports, please read the following general information. 1. 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. add-on card, modem, or extra memory capability). These LOCALIZED FEAT
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Precautions Do not use the monitor near water, e.g. near a bathtub, washbowl, kitchen sink, laundry tub, swimming pool or in a wet basement. Do not place the monitor on an unstable trolley, stand, or table. If the monitor falls, it can injure a person and cause serious damage to the appliance. Use only a trolley or stand recommended by the manufacturer or sold with the monitor. If you mount the monitor on a wall or shelf, uses a mounting kit approved by the manufacturer and follow the
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Table Of Contents Chapter 1 Monitor Features ………………………………………… 7 Introduction ……………………………………… 7 Electrical Requirements ……………………………………… 8 LCD Monitor General Specification ……………………………………… 9 LCD Panel Specification ……………………………………… 10 Factory Preset Timing ……………………………………… 13 Monitor Block Diagram ……………………………………… 14 Main Board Diagram ……………………………………… 15 Power Board Diagram …………………………………….. 16 Software Flow chart ……………………………………… 17 Main Board Layout ……………………………………… 19 Installation ……
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Monitor Features Chapter 1 Introduction Scope This short specification describes the electrical, optical and functional performance requirements for a 63.2cm (23.6”) TFT LCD color monitor with VGA&DVI compatible interface. Description The LCD monitor is designed with the latest LCD technology to provide a performance oriented product with no radiation. This will alleviate the growing health concerns. It is also a space saving
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Electrical Requirements of H235H Standard Test Conditions All tests shall be performed under the following conditions, unless otherwise specified. Warm up time ＞ 30 min. AC supply voltage 230V± 5 ％, 50± 3 Hz Ambient temperature 20 °C ± 5 °C Humidity 65% ± 20% Display mode 1920 x 1080, 60 Hz, Pixel Clock ：148.5MHZ,all white e-color mode Set to “User” mode Set to The value under user mode, which allows that the brightest Contrast control two of 32 linear distributed gray-scales (0 ～
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LCD Monitor General Specification 9
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Unit: cm Unit: inch 41.2 16.2 6.4 2.5 37.5 14.8 17.7 5.7 2.2 44.9 2.4 6.2 34.2 13.5 5.9 2.3 13.4 34.2 5.4 2.1 AL1916 AL1916 AL1716 AL1716 AL1516 AL1516 V Value Line alue Line AL1916W AL1916W AL1516W AL1516W 6.6 6.3 17.9 7.0 16.8 7.0 17.9 16.8 6.6 17.8 7.0 16.1 23.7 9.3 18.5 7.2 19.9 7.8 18.2 7.2 24.3 61.8 9.9 3.9 22.7 57.7 3.8 9.7 5.0 2 51.4 20.2 2 5.0 51.4 20.2 18.8 47.7 6.1 2.4 AL2416W AL2416W AL2616W AL2616W AL2216L AL2216LW W AL2216 AL2216W W AL2016W AL2016W 8.6 8.1 18.5 7.3 19.8 7.8 21.2 28
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LCD Panel Specification of H235H LTM230HT01 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 23” is 1920 x 1080 and this model can display up to 16.7 millions colors. General Specifications Block Diagram TFT LCD Module Electrical Characteristics 10
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Optical Specifications 11
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Factory Preset Timing of H235H 13
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Monitor Block Diagram 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. CCFL Drive. Flat Panel and CCFL backlight Main Board Power Board AC-IN 100V-240V Key board DVI Signal D-SUB Signal HDMI Signal 14
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Main Board Diagram Crystal 12MHz Panel Interface (X401) (CN404) Audio Digital-to-Analog converter PCM1754DBQR Scalar IC TSUMO58GDJ-LF Key control Interface (U601) (CN401) PC_INL (Include MCU, ADC, OSD) HDMI_INL PC_INR HDMI_INR (U401) Audio Power Amplifier Flash Memory TA6019A4 EN25F20 (U603) (U402) H sync V sync D-Data D-Clock RGB Audio Output EEPROM EEPROM EEPROM interface M24C02 M24C02 M24C02 (CN602) (U406) (U405) (U503) Ph
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Power Board Diagram 16V AC input Bridge Rectifier EMI filter Transformer Rectifier diodes and Filter 5V Start Resistor (R904, R905) Feedback PWM Control Circuit Power Switch (IC901) (Q901) Photo coupler (IC903) Output Transformer MOSFET 16V Circuit (PT801) (Q805,Q806) Lamp 5V PWM Control Feedback TA9687GN ON/OFF Circuit (IC801) DIM 16
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Software Flow Chart 1 Y 2 3 N N 4 N 5 Y 6 N 7 8 Y 9 Y N 10 11 Y N N 12 13 Y Y N 14 15 16 Y 17 N 18 19 Y 17
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Remark: 1) MCU initializes. 2) Is the EEPROM blank? 3) Program the EEPROM by default values. 4) Get the PWM value of brightness from EEPROM. 5) Is the power key pressed? 6) Clear all global flags. 7) Are the AUTO and SELECT keys pressed? 8) Enter factory mode. 9) Save the power key status into EEPROM. Turn on the LED and set it to green color. Scalar initializes. 10) In standby mode? 11) Update the lifetime of back light. 12) Check the analog port, are there any signals coming? 1
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Main Board Layout 19
