LCD display not working , external display works properly.
Device having issue: MacBook Pro 15" Core 2 Duo Model A1226
I have read plenty of related issues but none identical to the display issues I'm experiencing.
Background: I had a display issue prior but was fixed by Apple as a recall and was still under warranty. (3.5yrs ago)
Boot up displays on LCD (Apple log and animated circle), once the OS is loaded (login screen) the LCD goes black. Tried the flash light at an angle test, nothing shows, just black. Plugged in an external monitor/LCD, log into the OS and the laptop works perfectly.
Checked system preferences: Only the external monitor is listed and detected. Tried to re-detect monitors, only the external one is found.
Under system profiler:
Status: No Display Connected.
Light sensors seem to work as keyboard lights up
Tried the PRAM and NVRAM reset - No change.
Tried a fresh install of the OS to an external drive and got a strange result:
Both the LCD and external monitor works (almost like in mirror mode) but the mouse movement can only be seen on the external monitor.
I made the following assumption (Please feel free to correct):
1. Not a video card error since an external monitor works.
2. Not an LCD issue since it works on boot up
3. Not a software issue (OS) since a fresh install has the same results.
So now I"m looking to open the laptop and start changing parts. Could someone please give advice an what part to change out. Should I try the video cable, or the inverter?
Your help would be greatly appreciated!!
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