原帖由： Dan ,
To be sure of things you really need to try a better external display setup without using so many adaptions as any one of the adapters you are using could be messing you up. If the image is clean on the external then you know for sure. So… Let’s assume the signal is present on the TB3 ports, then all we need to do here is replace the damaged display assembly following this guide [guide|117328] and well need the following part: * [https://www.thebookyard.com/product.php?cPath=39_367_518&products_id=16766|13” MacBook Pro Fn Display Assembly - Space Grey, Apple P/N 661-07970] * [https://www.thebookyard.com/product.php?cPath=39_367_518&products_id=16768|13” MacBook Pro Fn Display Assembly - Silver, Apple P/N 661-07971] If you are sure you have no external display then you need the display as well as need your logic board repaired or it too will need to be replaced. This maybe beyond repair.