I have a 27" mid-2010 iMac A1312 with an i3 CPU and I have upgraded the CPU to an i7-870. The problem I have is that after reassembling everything, the backlight is not working. The imac turns on and I can see image on the screen if I use a flashlight, and if I connect an external monitor I can see that it is working and I can use it normally.
All 4 diagnostic LED's that are at the bottom of the logic board are on.
I have replaced LED driver board and the issue persists.
I have replaced the LVDS cable and still have the same issue.
I know that the display LED's are good because I've tested them with an LED tester and they turn on, I even tried it with the computer on and I could see the desktop.
I've read on the forum that the GPU might be the issue because it doesn't send the signal for the backlight to be turned on. Can this be the issue or might be the logic board? (logic board model is 820-2901-A)
Thank you for your help.
I have a 27" mid-2010 iMac A1312 with an i3 CPU and I have upgraded the CPU to an i7-870. The problem I have is that after reassembling everything, the backlight is not working. The imac turns on and I can see image on the screen if I use a flashlight, and if I connect an external monitor I can see that it is working and I can use it normally.
All 4 diagnostic LED's that are at the bottom of the logic board are on.
I have replaced LED driver board and the issue persists.
I have replaced the LVDS cable and still have the same issue.
I know that the display LED's are good because I've tested them with an LED tester and they turn on, I even tried it with the computer on and I could see the desktop.
I've read on the forum that the GPU might be the issue because it doesn't send the signal for the backlight to be turned on. Can this be the issue or might be the logic board? (logic board model is 820-2901-A)
Thank you for your help.