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(Created page with "{{stub}} {{Repair Guide |Device= |Affects parts= |Needs equipment= |Type= |Difficulty= }} ==Problem description== When the MacBook does turn on but there is no image on the LCD. Backlight may be present but the screen is blackthumb|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....") |
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{{Repair Guide | {{Repair Guide | ||
|Device= | |Device=MacBook Pro A1989 | ||
|Affects parts= | |Affects parts=Motherboard | ||
|Needs equipment= | |Needs equipment=multimeter, soldering iron, soldering station | ||
|Type= | |Type=Soldering | ||
|Difficulty= | |Difficulty=3. Hard | ||
}} | }} | ||
{{stub}} | |||
==Problem description== | ==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[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]] | When the MacBook does turn on but there is no image on the LCD. Backlight may be present but the screen is black[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]] | ||
Latest revision as of 15:25, 29 October 2023
| 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 |
This article is a stub. You can help Repair Wiki grow by expanding it
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.