Optima L903A, Service Manual, Page: 1 / 54

19" Wide LCD Color Monitor Optima L903A
1
Service
Service
Service
Horizontal Frequency
30 kHz-80 kHz
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 VOLTAGES.
Table Of Contents.......…….................……...........…........1
Revision List.…........................………................……......2
Important Safety Notice.………….…..................……......3
1. Monitor Specification.................................………........4
2. LCD Monitor Description…………………………….......5
3. Operation Instruction…………...................…...........6
3.1 General Instructions.....................................…...........6
3.2 Control Button……………………………..……...........6
3.3 Adjusting the Picture...........................…............8
4. Input/Output Specification............……………............10
4.1 Input Signal Connector............…..……................10
4.2 Factory Preset Display Modes.........................11
4.3 Panel Specification.....………………........................12
5.Block Diagram…….…................……………...............15
5.1 Software Flow Chart…………………………….........15
5.2 Electrical Block Diagram…………………...…......17
6. Schematic……………..............................….....19
6.1 Main Board…………..............................................19
6.2 Power Board....……………....................................24
6.3 Key Board ……………………………..…………….26
6.4 Audio Board....……................................................27
7. PCB Layout..………….......................................28
7.1 Main Board……………......................................28
7.2 Power Board…......................................................31
7.3 Audio Board....…….......................................33
7.4 Keypad Board……….....................................33
8. Maintainability……….......................................34
8.1. Equipments and Tools Requirement.....................34
8.2. Trouble Shooting…………....................................35
9. White-Balance, Luminance adjustment...................41
10.Monitor Exploded View……..……………............42
11.BOM List....…….....................................................43
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING