Table Of Contents - NEC MultiSync LCD1525V Service Manual

TROUBLE SHOOTING

TABLE OF CONTENTS

page
1. No display of screen(Screen is black ,color of LED is amber) ........................................6-2
2. Nothing displays on screen(Screen is black ,color of LED is green) ...............................6-3
3. Checking the back light unit .............................................................................................6-6
4. Abnormal screen ..............................................................................................................6-7
5. No OSM display ..............................................................................................................6-9
6. Abnormal Auto adjustment ............................................................................................ 6-11
7. Abnormal plug and play operation .................................................................................6-12
7.1 Abnormal DDC1 ...........................................................................................................6-12
7.2 Abnormal DDC2 ...........................................................................................................6-12
8. Checking the interface circuit of sync signal ..................................................................6-13
8.1 Checking the control circuit of horizontal sync pulse ...................................................6-13
8.2 Checking the control circuit of vertical sync pulse .......................................................6-13
9. Checking the resolution change IC movement ..............................................................6-14
10. No power on ................................................................................................................6-15
11. Checking the DC/DC converter circuit .........................................................................6-16
12. Checking the operation of CPU ...................................................................................6-17
6-1