Built in display only works fine when connected to an external display

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MacBook Pro 13" Retina Display metà 2014

Modello A1502 / processore dual core Intel i7 2,6 GHz (Turbo Boost fino a 3,1 GHz) o 2,8 GHz (Turbo Boost fino a 3,3 GHz) con 4 MB di cache L3 condivisa.

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Sam @thesniper

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Postato: 18 feb 2022

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Built in display only works fine when connected to an external display

All,

When not connected to an external display. My built in display is erratic its working but the screen is so filled with lines different colors that it is un useable. (although you can see some semblance of the desktop). When I plug in any external monitor with any HDMI cable it starts working perfectly. Both the built in monitor and the external monitor. I have tried so many things Ive ran out and resorted to this forum for perhaps a solution. Things like contacting apple, rebooting, firm ware, Os updates to name a few. I have read countless similar problems But Most of the others are the Built in screen is NOT working in any scenario. While mine does with an external connection. I am now looking at the idea of replacing either part LCD LVDS Display Cable or the HDMI /Usb board. Any thoughts would be appreciated ::

-Sam

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Dan @danj Rep: 481k Self employed contract worker 35 330 971 · Answer 1 · 2022-02-18T09:01:45-07:00

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Dan @danj

Rep: 481k

Self employed contract worker

35

330

971

Postato: 18 feb 2022

Opzioni

Ouch! In your case the MUX logic within the main logic board is having issues. This is a loading issue where when you connect the external the load needed is present and when you disconnect the external the signals get messed up. Sometimes the issue is within the internal displays T-CON logic.