Select Page

What’s wrong with this MacBook?

This customer sent in their MacBook Pro to our store in New York City for our logic board repair service because it had no light on the screen. When we shine a light through the back of the screen, we see an image. That means that this machine is displaying an image but has no backlight.

What do we do to fix this?

Diagnosing the circuit

After we confirm that this MacBook has an image, we measure the Backlight Output voltage. Different voltages on the backlight output circuit mean different things. This MacBook has 11.3V on backlight output. Then, we check the enable line for the backlight circuit. which measures 2.7V, which means that it is being told to turn on. These voltages tell us that the backlight circuit is not boosting. The backlight chip on this board is receiving all the required inputs, but not putting out backlight voltage. This means that the chip itself is likely bad.

Repairing the issue

We have discovered that the backlight chip is the likely culprit in this MacBook. Using our hot air station, we remove the chip, wick the pads underneath, and replace the chip. After letting the board cool down, we turn the machine back on. We find that the screen now has backlight and the issues have been resolved.

I can’t fix this myself. How do I get it fixed?

Rossmann Repair Group repairs MacBooks in New York City. Our MacBook Repair is not limited to NYC though, we accept mail-in repairs from virtually anywhere! Visit https://sendyourmacbook.com to start your MacBook repair.