Re: Macbook Air 2015 no backlight
Yes, the charge pump ic for the backlight could be defective. It took us 3 attempts to get it right for the soldering.
Suggest to use sticky flux for the site along with kapton tape to protect any nearby parts you do not want to fly away.
Use 400-500c hot air temps but low air pressure so parts for not fly away. Personally like 20-30 setting on our 860 on our unit from Best tools. Amazing hot air tool.
When you think you have it right, power up without the lvds cable.
Check the voltage out on the lvds connector. From memory, it should be 25v or higher if soldered correctly.
Download the data sheet and review the schematic from Texas instruments. It is the same typical design used by Apple. This is very helpful to understand how this backlight device works.
The good thing is that the part is cheap. Available from Arrow electronics.
From memory, I recall the Apple schematic having a value for the voltage rail expected from this backlight controller if working correctly.
What value do you see?
As noted, our effort took 3 attempts to get it right but we did this without a microscope. Still on my wish list of purchases. Debating between desktop vs. mono style. The optics appear to be higher for desktop like used by Hussein at Northwest repair. About $1k usd for that setup.
Yes, the charge pump ic for the backlight could be defective. It took us 3 attempts to get it right for the soldering.
Suggest to use sticky flux for the site along with kapton tape to protect any nearby parts you do not want to fly away.
Use 400-500c hot air temps but low air pressure so parts for not fly away. Personally like 20-30 setting on our 860 on our unit from Best tools. Amazing hot air tool.
When you think you have it right, power up without the lvds cable.
Check the voltage out on the lvds connector. From memory, it should be 25v or higher if soldered correctly.
Download the data sheet and review the schematic from Texas instruments. It is the same typical design used by Apple. This is very helpful to understand how this backlight device works.
The good thing is that the part is cheap. Available from Arrow electronics.
From memory, I recall the Apple schematic having a value for the voltage rail expected from this backlight controller if working correctly.
What value do you see?
As noted, our effort took 3 attempts to get it right but we did this without a microscope. Still on my wish list of purchases. Debating between desktop vs. mono style. The optics appear to be higher for desktop like used by Hussein at Northwest repair. About $1k usd for that setup.
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