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|Affects parts=Motherboard | |Affects parts=Motherboard | ||
|Needs equipment=multimeter, soldering iron, soldering station | |Needs equipment=multimeter, soldering iron, soldering station | ||
|Type= | |Type=Soldering, Part replacement | ||
|Difficulty=3. Hard | |Difficulty=3. Hard | ||
}} | }} | ||
Latest revision as of 15:26, 29 October 2023
| 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
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.