MacBook Pro A1502 No image repair and MacBook Pro A1502 2015-2016 Not turning on (90 mA current draw) repair: Difference between pages

From Repair Wiki
(Difference between pages)
(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...")
 
No edit summary
 
Line 1: Line 1:
{{stub}}
{{Repair Guide
{{Repair Guide
|Device=
|Device=MacBook Pro A1502
|Affects parts=
|Affects parts=Whole board
|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
No power, no green light, 90mA taken, PPBUS_G3H stuck at 12.27 V
[[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==


* No image on LCD
*Not turning on
*Only pulling 90 mA from charge port
*No green charge led
*PPBUS_G3H stuck at 12.27 V


==Solution==
==Solution==
This problem has multiple causes:
Corrosion around SMC chip and surrounding components, short on PP3V42_G3H, bad clock chip).
 
* 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).
[https://www.youtube.com/watch?v=aMy3xLcH78g Example video]:  (Reflow of SMC, replaced surrounding components, jumper wire, used voltage injection to determine short, replacement of clock chip).

Latest revision as of 13:05, 8 November 2023

MacBook Pro A1502 2015-2016 Not turning on (90 mA current draw) repair
Device MacBook Pro A1502
Affects part(s) Whole board
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

No power, no green light, 90mA taken, PPBUS_G3H stuck at 12.27 V

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

Symptoms

  • Not turning on
  • Only pulling 90 mA from charge port
  • No green charge led
  • PPBUS_G3H stuck at 12.27 V

Solution

Corrosion around SMC chip and surrounding components, short on PP3V42_G3H, bad clock chip).

Example video: (Reflow of SMC, replaced surrounding components, jumper wire, used voltage injection to determine short, replacement of clock chip).

Retrieved from "https://repair.wiki/index.php?title=MacBook_Pro_A1502_No_image_repair&oldid=992"