AOC L20S421 Service Manual

20" LCD TV Color Monitor
Service
Service
Service
Description
Table Of Contents......................................................1
Revision List........................................................2
Important Safety Notice.....................................3
1.General Specifications...............................................4
2.Operating Instructions..........................................6
2.1.The Use of Remote Control....................................6
2.2.To Use the Menu.....................................................7
2.3.LCD TV Description.............................................14
2.4.Interface Connector................................................14
3.Precautions and Notices..........................................15
3.1.Assembly Precaution............................................15
3.2.Operating Precaution.......................................15
3.3.Storage Precaution.............................................15
3.4.High Voltage Warning..........................................15
4.Input/Output Description....................... ...........16
4.1.D-SUB Connector............................................16
4.2.Factory Preset Display Modes...........................17
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 VOLTAGE
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING

TABLE OF CONTENTS

Page Description
5.Front Panel Control Knobs.......................................18
6.Repair Flow Chart...................................................19
7.Mechanical Instructions...............................25
8.Exploded View......................................................29
9.Parts List of Cabinet...........................................30
10.PCB Layout.....................................................58
10.1.Main Board.....................................................58
10.2.Power Board..................................................60
10.3.Tuner Board....................................................63
10.4.IR Board.........................................................66
10.5.Headphone Board...........................................67
10.6.Keypad Board..................................................67
11.Block Diagram................................................68
12.Schematic Diagram....................................69
12.1.Main Board.............................................69
12.2.Power Board..............................................82
12.3.Tuner Board..............................................85
SAFETY NOTICE
1
AOC L20S421
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