NEC MultiSync LCD1550ME - Trouble Shooting

6-1
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 plug and play operation ----------------------------------------------------------------- 6-10
7. Checking the interface circuit of sync signal ----------------------------------------------------- 6-11
7.1 Checking the control circuit of horizontal sync pulse ---------------------------------------- 6-11
7.2 Checking the control circuit of vertical sync pulse -------------------------------------------- 6-11
8. Checking the resolution change IC movement ------------------------------------------------- 6-12
9. No power on ---------------------------------------------------------------------------------------------- 6-13
9.1 No power on (1) ----------------------------------------------------------------------------------------6-13
9.2 No power on (2) ----------------------------------------------------------------------------------------6-14
10. Checking the DC/DC converter circuit ----------------------------------------------------------- 6-15
11. Checking the operation of CPU ------------------------------------------------------------------- 6-16
12. Checking the audio circuit -------------------------------------------------------------------------- 6-17
13. Check the inverter board circuit ------------------------------------------------------------------- 6-18