Dear collegues,
the owner of this machine brought it to me saying that suddenly one day the display didn't turn on anymore, he tought that all the machine was damaged but it turned out that the MacOS starts good and stays on, and that connecting it to an external display it works without problems.
If you take a look into general settings, you can also see that the internal retina display is recognized as connected by the main board but for an unknown reason it doesn't turn it on.
I've tried to put a bright light towards the screen but I can't see anything, any shadows or apple signs during startup, so it seems that the matrix is not even driven.
I've found schematics and boardview of this board (820-02098-A) but it's difficult to diagnose and also to take measures because the main video signals are in the internal part close to the keyboard :/
The board is completely clean, no traces of liquids, no oxydizations anywhere, no burned components, the external chassis is clean and has no signs of hits or scratches, and the owner said that it wasn't exposed to heat or cold or water, but always used in his studio.
Sandly I have no other similar displays to try on, nor other similar mainboards, so I have to find the fault on this machine itself.
I've read that the LID sensor is something special on these machines and it has communication with CPU which needs UR330 outputs to control TP/KB, internal video and digital microphone, and if you change it you have to program and calibrate it :o
I've tried detaching the lid sensor but the behaviour is the same (I know that it can't prove anything because maybe I need a completely working sensor programmed for this mainboard to have a proof).
Some of you have had similar problems on a similar machine or can point me to a direction?
Thank you for your time
the owner of this machine brought it to me saying that suddenly one day the display didn't turn on anymore, he tought that all the machine was damaged but it turned out that the MacOS starts good and stays on, and that connecting it to an external display it works without problems.
If you take a look into general settings, you can also see that the internal retina display is recognized as connected by the main board but for an unknown reason it doesn't turn it on.
I've tried to put a bright light towards the screen but I can't see anything, any shadows or apple signs during startup, so it seems that the matrix is not even driven.
I've found schematics and boardview of this board (820-02098-A) but it's difficult to diagnose and also to take measures because the main video signals are in the internal part close to the keyboard :/
The board is completely clean, no traces of liquids, no oxydizations anywhere, no burned components, the external chassis is clean and has no signs of hits or scratches, and the owner said that it wasn't exposed to heat or cold or water, but always used in his studio.
Sandly I have no other similar displays to try on, nor other similar mainboards, so I have to find the fault on this machine itself.
I've read that the LID sensor is something special on these machines and it has communication with CPU which needs UR330 outputs to control TP/KB, internal video and digital microphone, and if you change it you have to program and calibrate it :o
I've tried detaching the lid sensor but the behaviour is the same (I know that it can't prove anything because maybe I need a completely working sensor programmed for this mainboard to have a proof).
Some of you have had similar problems on a similar machine or can point me to a direction?
Thank you for your time
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