MacBook only start with external monitor and closed lid

I already tried it. The cable and the connector looks fine. I wonder if its a problem with the display or with the logic board. Because the macbook only starts with the closed lid or disconnected display cable, otherwise the device freeze while booting.

Most likely the logic board has been liquid damaged. It sounds like the hall effect sensor circuit needs diagnosing.

That circuit is responsible for sensing whether or not the MacBook is closed or open via magnetic sensors. It controls the display and backlight enable circuits as well.

To do that it requires microsoldering rework / circuit diagnosing on the logic board.

You may be able to find a reputable repair shop that repairs liquid damaged MacBook to fix this problem for you.

Hello Ben,

thanks for your answer. I have a SMD soldering station here and a FLUKE multimeter. Where is the Hall effect sensor and his circuit located on this device. Maybe someone can instruct me which pins and components I should measure.

When I fire up the macbook with disconnected internal monitor and connected external monitor, I can open and close the lid without messed up the external monitor. So I think the Hall effect sensor is good. I've tested this scenario yesterday. Question: Can I test a the display assembly on a 13" MacBook Pro from the same year, also mid 2014. Only to be sure that not the display or the internal cable is broken.

@blob810 - inspection is the only real way to figure this out take a good detailed image of the logic board connector and the cable end so I can see how it looks Aggiungere immagini ad una domanda