| MacBook Pro A1989 No image repair | |
|---|---|
| Device | MacBook Pro A1989 |
| Affects part(s) | Motherboard |
| Needs equipment | multimeter, soldering iron, soldering station |
| Difficulty | ◉◉◉◌ Hard |
| Type | Soldering, Micro-Soldering"Micro-Soldering" is not in the list (Soldering, Teardown, Part replacement, Cleaning, Software, BGA, General) of allowed values for the "Repair Guide type" property. |
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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
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.