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MacBook Pro A1990 No image repair

From Repair Wiki
MacBook Pro A1990 No image repair
Device MacBook Pro A1990
Affects part(s) Motherboard
Needs equipment multimeter, soldering iron, soldering station
Difficulty ◉◉◉◌ Hard
Type Soldering, Part replacement


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Problem description

When the MacBook does turn on but there is no image on the LCD. Backlight may be present but the screen is black

Example image (Figure 1) -- No image yet. Help expand this page by uploading it!

Symptoms

  • No image on LCD

Solution

  • Check the LCD cable and the connector on both the screen side and the logic board side.
    • The backlight power line is right next to the eDP data line for the image.
    • Any minor corrosion here results in 30 volts or more going to the displayport mux, U9850.
      • U9850 is what the dedicated GPU and the CPU's integrated GPU go to before it goes to the screen.
      • Unlike the 13" machine where the backlight voltage destroys the CPU, here it destroys a cheap chip.
        • Replace U9850, and the screen cable, and the connector(on the screen side and the logic board side) and it will usually be fine.