MacBook Pro A1502 No green light on charger repair and MacBook Pro A1502 No image repair: Difference between pages

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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 black thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it! ==Symptoms== * No image on LCD ==Solution== This problem has multiple causes: * Bad screen cable * Screen cable needs reseatin...")
 
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{{Repair Guide
{{Repair Guide
|Device=MacBook Pro A1502
|Device=
|Affects parts=Whole board
|Affects parts=
|Needs equipment=multimeter, soldering iron, soldering station
|Needs equipment=
|Type=Soldering
|Type=
|Difficulty=3. Hard
|Difficulty=
}}
}}
{{stub}}
==Problem description==
==Problem description==
<nowiki>#</nowiki>incomplete
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!]]
[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]]
==Symptoms==
==Symptoms==


*Green light on charger not turning on
* No image on LCD


==Solution==
==Solution==
This problem has multiple causes:
This problem has multiple causes:  
 
* Bad screen cable
* Screen cable needs reseating (this fixes it a surprising amount of the time)
* Blown L8300
* Bad GPU inside the CPU.
* Bad U8300 causing partial short to ground on 5 V output causing screen to only receive around 3 V. Replace U8300 fixes this issue. Isolate whether the short is on the screen connector side or the U8300 side by removing the nearby inductor and measuring both sides of the pads where the inductor was.


* ADAPTER_SENSE not 3 V due to bad DC in board. 16–20 V on ADAPTER_SENSE means charger voltage is leaking into ADAPTER_SENSE, below 2 V means it is missing usually due to a bad DC In board.
When you find that 5 V is still missing on L8300 and LCD_PWR_EN is missing on U8300, do not chase since 99% of the time this turns out as a no fix (usually bad iGPU or MUX communication issues).
* PP3V42_G3H missing
* SMC not working(if SMC is off, you will have 12.23 V on PPBUS_G3H instead of 12.56 V) because it is dead, not turning on(SMC_RESET_L low).
* Corrosion of the SMC's solder connections
* Keyboard bad, shorting PP3V42_G3H to ground or power button stuck on.
* Bad U7000
* Bad U7001
* Bad U7100 — indicators: PPBUS_G3H Below 4 V, board taking 40 mA, U7100 getting warm (check via thermal camera)

Revision as of 13:01, 8 November 2023

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MacBook Pro A1502 No image repair
Device
Affects part(s)
Needs equipment
Difficulty
Type


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

This problem has multiple causes:

  • Bad screen cable
  • Screen cable needs reseating (this fixes it a surprising amount of the time)
  • Blown L8300
  • Bad GPU inside the CPU.
  • Bad U8300 causing partial short to ground on 5 V output causing screen to only receive around 3 V. Replace U8300 fixes this issue. Isolate whether the short is on the screen connector side or the U8300 side by removing the nearby inductor and measuring both sides of the pads where the inductor was.

When you find that 5 V is still missing on L8300 and LCD_PWR_EN is missing on U8300, do not chase since 99% of the time this turns out as a no fix (usually bad iGPU or MUX communication issues).

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