View source for MacBook Pro A2289 Not turning on, fluctuating current draw 0.03-0.1A at 20V repair

{{Repair Guide
|Device=MacBook Pro A2289
|Affects parts=Motherboard
|Needs equipment=multimeter, soldering iron, soldering station, thermal camera
|Type=Soldering
|Difficulty=3. Hard
}}
{{stub}}
==Problem description==
This issue is often caused by a short to ground on a sub-rail, which can be accurately detected with a high resolution thermal imaging scan. Low resolution thermal imaging may not reveal the subtle signs of a small shorted component, making it a less reliable diagnostic method.
[[File:Placeholder image.jpg|thumb|Example image (Figure 1) -- No image yet. Help expand this page by uploading it!]]
==Symptoms==

*No power
*No fan spin
*All voltages missing

==Solution==
If the issue has a single, specific solution, provide it in this section and delete the sub-headers below. Otherwise, if there are multiple potential causes for the problem, outline the process of identifying the root cause and offer corresponding solutions below.

===Diagnostic Steps===

* Perform High Resolution, High Sensitivity thermal imaging of the entire system board. 
** Low resolution thermal imagers will likely not pick up the subtle temperature changes failures like this often present with. 
** The failure will often present as a component quickly heating up and cooling down in sync with the amperage changes; Occasionally, you will find a resistor heating up/cooling down in sync with the amperage changes. 
** The short is likely caused by something on the output side of the resistor.

===Repair Steps===

* Remove and Replace the shorted component based on thermal imaging findings.