AOC Envision L20S421, Service Manual

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20” LCD TV Color Monitor AOC L20S421
1
Service
Service
Service
TABLE OF CONTENTS
Description Page Description Page
SAFETY NOTICE
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
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
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
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING