Chosen Solution
Hi, Can tell me if this is the backlight chip or something else. On an external display everything works perfectly. The screen itself is perfect and tested on another screen but the problem remains the same.. The LCD connector is perfect and without damage. Logic board number 820-00138 At startup everything works perfectly. The apple logo lights up on the back off the screen but the Lcd stays black. This has to do with the backlight chip or something else. Does the backlight chip affect the boot of your LCD? The backlight chip looks good without defects but I do not know where to go search now. I hope somebody can send me on the right track. thank u
Try reconnecting the LCD cable screen side; this can cause backlight to work but no picture, usually after a drop. If not this, check L8300 and all the dual ferrite beads for the DP_INT_ML_C_P and DP_INT_ML_C_N signals, make sure they get continuity and haven’t burnt. These signals tell the display when to show image (what LVDS_CONN_A_CLK_N and LVDS_CONN_A_CLK_P used to do on the older models, except there are more signals on the newer models doing this), so if one of these components are not getting continuity due to being burnt, it will just sit on a black screen; since the screen doesn’t know when to display certain signals. Get a schematic and board view file for your specific board and check it out.
Hi There I have the same issue. Could you tell me where did to buy new FL8303 ? Regards Juha
