2016 MacBook Pro 13 inch Touchbar no power

[waakye]

Hi folks,
Got this MacBook pro 13 inch for dirt cheap because the seller said it doesn't turn on. Upon opening the laptop, and investigating the screen connector mainly the camera and backlight cable, it seems that the backlight cable was somehow repaired because there is an electrical tape on it. I am suspecting that it was a flex gate repair that went south.
My question is that what components be damaged if a flexgate repair was not done right.
Thanks for all for chiming in.

[waakye]

Re: 2016 MacBook Pro 13 inch Touchbar no power

No one can help.

[reformatt]

Re: 2016 MacBook Pro 13 inch Touchbar no power

A shorted backlight won't result in a dead board, worst case scenario the backlight fuse would blow. Check your LCD connector for damage around the backlight pin however, as liquid damage in here results in 50V going into the CPU via one of the EDP data lines.

[waakye]

Re: 2016 MacBook Pro 13 inch Touchbar no power

Thanks Reformatt! I will review the LCD backlight pin.

[waakye]

Re: 2016 MacBook Pro 13 inch Touchbar no power

Reformatt, you are absolutely right about the info you provided. I disconnected the backlight flex cable and let the system sit for a couple of hours and now it turns on and chime. I will scope for a screen.
Thanks again Reformatt.

[reformatt]

Re: 2016 MacBook Pro 13 inch Touchbar no power

The machine should still have a display via USB-C/HDMI if it is booting. Press CMD+F1 to switch focus if it's stuck at the logon screen.

Check the short interconnect cable from J8500 for liquid damage. Pin 43 which carries your 50V for backlight often shorts to pin 1 (EDP_INT_AUX_IN) if any liquid gets in there. That pin usually reads short to ground if that has happened. Machine still works, but no display on the internal screen.