NEC MultiSync LCD1550V Service Manual page 55

TROUBLE SHOOTING
TABLE OF CONTENTS
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 ---------------------------------------------------------------------- 6-10
7. Abnormal plug and play operation ------------------------------------------------------------ 6-11
7.1 Abnormal DDC2 ---------------------------------------------------------------------------------- 6-11
8. Checking the interface circuit of sync signal ------------------------------------------------ 6-12
8.1 Checking the control circuit of horizontal sync pulse ------------------------------------ 6-12
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 operation of CPU --------------------------------------------------------------- 6-16
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