Chosen Solution
a question? If everything is measured and it is perfect, what would be the step to follow where would the problem be in the Flex? because I have the same problem, the iMac 21.5 Late 2013 14.1 starts normally but you can see very little of the image of the apple when it is starting Now, I did tests with another iMac 21.5 Late 2012 and I get the same problem, the screen is dark, it is impossible for me to believe that something on the Board has been damaged in both iMacs @iphix Update (09/16/2022) I will have to do the measurement on the board to be sure, my board is 820-3588-A @oldturkey03
If you tested the same lcd on two different imacs, then there is a high possibility the lcd backlight is burned Which means you’ll need a new lcd display. My iMac as I remember when I replaced the filter ( ordered from Alibaba) the light worked right away no issues.
