Kobian 1990TWA, Service Manual, Page: 1 / 49

19”W LCD Color Monitor KOBIAN 1990TWA
1
Service
Service
Service
Horizontal Frequency
30kHz – 83kHz
TABLE OF CONTENTS
Description Page Description Page
N
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 Instructions…………...............……...........6
3.1 Control Buttons…………….…..............……...............6
3.2 Attaching the Cables…………..............……...............7
3.3 Adjusting the Picture...........................…............7
4. Input/Output Specification............……….……...........10
4.1 Input Signal Connector............…………...................10
4.2 Factory Preset Display Modes...........................10
4.3 Panel Specification.....………………..................11
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..…………….…….................................27
7.PCB Layout..……………….......................................28
7.1 Main Board…………….........................................28
7.2 Power Board…..………...................................29
7.3 Key Board…..……….....................................30
8. Maintainability……….......................................31
8.1 Equipments and Tools Requirement……..............31
8.2 Trouble Shooting..…….………..............................31
9. White-Balance, Luminance adjustment.............37
10. Monitor Exploded View……….……………............39
11. BOM List……….....................................................40
CAUTION: USE A SEPARATE ISOLATION TRANSFOMER FOR THIS UNIT WHEN SERVICING