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Display issues, darker on one side of the screen

Hi

I'm sure this has been asked before.

I replaced the battery in my friend's MacBook yesterday without a hitch and the display was fine.

My friend contacted me last night to tell me the display brightness is off, it's darker on the left side and normal brightness on the right.

I tried zapping the PRAM, resetting the SMC and even ran the AHT (Apple hardware test). The AHT said no issues.

I took a photo of the display and its attached. It might look like it's completely black in the photo but in real life, it's just darker.

Block Image

Is the display going bad, (inverter cable or LCD cable), a graphics card issue? If it's the display I could replace the display entirely or cables myself.

My guess is it's the display, inverter or LCD cable perhaps.

If you need more information, let me know.

MacBook 6,1, unibody, late 2009, OS X Yosemite, 10.10.5. 8GB of RAM.

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Make sure the LCD cable is plugged in properly, into the board and screen. Most of the time this happens due to the cable not being fully pushed into the logic board, so it is only lighting a number of LEDs for the screen. You can try brushing the inside of the LCD connector with a soft brush and 95%+ isopropyl, in case there is dirt inside, stopping a proper connection.

It can be caused by other things (LCD, LED return resistors, etc) but I would say the above is the most likely reason, if it was fine when you had it. The cable probably wasn't secured properly and came slightly loose.

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Also make sure you don't have any liquid damage around the backlight driver chip.

Its also possible you have a bad solder joint on the driver or the driver is burn't. The driver powers 6 strings of LED's within the backlight unit. Clearly some of the strings are dead.

Hi,

Thanks for the answer.

if I decide to replace the entire display with this one from eBay for my client, do you think that will solve the issue or is it something more.

@spearson48 - If the LED's within the display or the cable are damaged then replacing the assembly should fix things. But, you also have the logic board LED driver chip. did you inspect the logic board to make sure it was OK?

I ended up replacing the entire display and it fixed the issue. Replacement went without a hitch.

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Check to make sure that the backlight cable is plugged in all the way and free of dust. Make sure the connector is seated correctly and locked in place. It could also be that your backlight inverter is going bad and will need to be replaced.

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