Do the screen have a bad logic board, if it doesn’t connect?
I have bought a defective Thunderbolt screen, described as a bad PSU failure, thinking it was a bargain. I managed to replace the PSU and get power to the unit. But the screen is still black.
When connecting to my MacBook, there is power, but my MacBook cannot find the screen,
What I have tried:
I tried to use external thunderbolt cable to connecton the back of the screen.
I tried smc reset and PRAM reset.
I also tried to connect to my imac to isolate problem with thunderbolt connection on my MacBook, still nothing.
I have checked that there is power to the logicboard, with an USB stick that lights up when connected. But the strange thing I have observed, is that when I connect through the thunderbolt on the back, there is no power to the usb stick.
What I want help with:
Can the MacBook recongnise the screen even though the thunderbolt lcd is not connect?
If so then I can maybe isolate the lcd as the problem
I suspect the lcd screen, the lcd flex cable and the logicboard. But as the screen itself cannot be found, can I conclude that it most probably the logicboard?
Это хороший вопрос?