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Hi I just replaced the lcd of my macbook and now the backlight does not work. when I turn on the laptop, the lcd works but the backlight does not turn on. I tested with a couple of screens but no success. Is the problem with the backlight LED, or fuse or logic board, is there any solution? Model: Macbook air, 11 inches model A1370, 2011. Any help would be highly appreciated
Navid km, since the cables were inversed, it is possible that you have issues with the fuse or the Mosfet. Check the fuse for continuity. It is a 3AMP-32V-467 and is available right here. Hope this helps, good luck. F9700 is the fuse
Here is the location on the motherboard
ErrorInvalid image: 225685 align=centerExample:[image|123]Current text:[image|225685 align=center|align=left] Update This is in respond to an email. The backlight driver is U9701 on the motherboard. It is a LP8550. the datasheet is available right here. Hope this clarifies it further.
Hi guys I have doubts how to connect the backlight cable to the ZIF connector in the LCD converter board. The backlight cable is coming from the lid and the converter board is connected to the LCD. Here is a picture which compares two possible ways to connect the cable to the ZIF connector. As I recall the right pic (no. 2) should be correct but it makes more sense that the left pic (no. 1) is correct. Any idea?
Hi I managed to design my own board for the backlight driver, it works quit good in fact. In has the PWM as the input so that it can control the brightness. Also it has the control signal to turn off the backlight in sleep/screen saver mode. Here is a picture of the board. Let me know if you need further info.
Ref. 1369A airbook. Double check your backlight cable. It is the small cable in the middle of the polarizer control board. It has to be installed with the 2 white strips facing up and copper down.
Hi guy I managed to take out the logic board and locate the chip (LP8550). Here is a picture of the board showing the place of the chip. It seems really challenging to replace the chip with all tiny components around. I hope that is the problem with backlight.. regards Navid
Hello, When replacing the LCD of my Macbook 4,1 I also had problems with the backlight. When I had put the whole thing back together it did turn on, even the screen, but I hardly could not see anything. I came out that during my repair process I did not put the inverter cable back in the right way, which cracked the cable.. Mayby that could be an issue with yours to?
I checked the LVDS cable, seems fine but I’ll check the pins according to the schematic by multimeter and a magnifier… I soldered some wire to the input/output of the driver to check if everything is right… here is a picture:
“I have doubts how to connect the backlight cable to the ZIF connector in the LCD converter board.” THe second pic is correct with the copper facing down. You’ve got it wrong though because the ribbon cable wraps around the inverter and back into the clip. Should be absolutely no need to twist the cable :) This absolutely did my head in. Hope this helps others
