this answer is not to diagnose your backlight failure. It is to show you the fuse and the WLED IC. The reference designator is F7700 for the fuse and it is a 3A 32V fuse in a 0603 package and the driver is U7700 and it is a LP8548B1SQ_-04 IC. Start with that and see what voltage etc. you find when checking your board. You are looking for 2.7V to 3V on pin 17 and 5V on pin 5 and 18 of the WLED driver. you also want to check the voltage on pin 1 of the LCD connector. Let us know what you find in case somebody can help you out more. Or of course, like Bradley suggested just get a logic board ;-)
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@deepalip5 this answer is not to diagnose your backlight failure. It is to show you the fuse and the WLED IC. The reference designator is F7700 for the fuse and it is a 3A 32V fuse in a 0603 package and the driver is U7700 and it is a LP8548B1SQ_-04 IC. Start with that and see what voltage etc. you find when checking your board. You are looking for 2.7V to 3V on pin 17 and 5V on pin 5 and 18 of the WLED driver. you also want to check the voltage on pin 1 of the LCD connector. Let us know what you find in case somebody can help you out more. Or of course, like Bradley suggested just get a logic board ;-)
this answer is not to diagnose your backlight failure. It is to show you the fuse and the WLED IC. The reference designator is F7700 for the fuse and it is a 3A 32V fuse in a 0603 package and the driver is U7700 and it is a LP8548B1SQ_-04 IC. Start with that and see what voltage etc. you find when checking your board. You are looking for 2.7V to 3V on pin 17 and 5V on pin 5 and 18 of the WLED driver. you also want to check the voltage on pin 1 of the LCD connector. Let us know what you find in case somebody can help you out more. Or of course, like Bradley suggested just get a logic board ;-)
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