Acer S243HL Service Manual - Page 54

2. Backlight can't be turned on No raster? Yes LED orange? Yes Backlight can't be turned on. Yes Is there 19V No voltage on pin23 of IC501,IC503 Check adapter Yes Is there high-level voltage No on pin1of IC501,IC503? Yes Is R501 OK? Check I/F board Yes Are CN511 and CN512 connected rightly? Yes No No R501open Connecting the output connector again No Is Pin24 of IC501,IC503(VREF) 5V? Is IC501,IC503 ok? Yes No Is ok L501,L502? Yes Check feedback circuit No IC501,IC503 fail L501,L502 fail END