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I recently received a Macbook Pro A1502 Retina liquid spill with logic board number 820-3476-a. Unit boots up but no back light. Does anyone know the location of the back light fuse and wled driver? Crazy thing I had it working fine however when installing the OS back light just went out. Also how many volts should I be getting on pin one? Thanks

I think this might be the location of the fuse

This is all wrong. You’re talking about buying replacement chips without even having a schematic or a boardview. How can you know what to replace without even knowing where to measure??? How do you know the LED driver is bad? Get a schematic and a boardview for 820-3476, then answer the following questions before further guessing.

  1. Do you have 2.7v to 3v enable signal on pin 17 of U7700?
  2. Do you have 5v on pins 5 and 18 of U7700?
  3. Is R7733 0 ohms?
  4. Is feedback network between R7731 and R7732 functioning properly? Traces to resistors good? Resistors themselves good?
  5. What voltage do you have on backlight output, pin 1 of LCD connector? 0v? 12v? 20v? 27v?

allenzabbal, you are correct. The reference designator is F7700 and it is a 3A 32V fuse in a 0603 package and the driver is U7700 and it is a LP8548B1SQ_-04 IC.