MacBook Pro A1278

[tintin007]

Hi,

I have the right boardview and schematics from this site, Pretty sure i have a sensor issue. Could someone share the ASD 3s155 with me so i can run the tests ?? Prefer .rar format. Cheers

[Stratos]

hello,what symptoms you have?loud fan and slow cpu speed?

[tintin007]

yes pretty much that. loud fan, very sluggish, kernel task 200+%, took a long long time to re install OS

[Stratos]

i have in the pass the same on macbook pro 13 mid 2010.
before look for problem on hardaware you must know this is what macbook pro do in some cases without battery.
your battery is ok?

[Stratos]

my macbook under this conditions took 24 hours to instal os!
try this https://www.youtube.com/watch?v=N5o1-7OuO8A
if you have problem to delete the file you do this https://www.youtube.com/watch?v=_YmcjqkpI4A&t=44s

[tintin007]

Hi Stratos, Battery is ok. charges up to full capacity, according to display. using mac charger and led changes from amber to green. I tried the other you tube fix before posting, It didn't make any difference at all. Hence why i think its a hardware issue. Its a mid 2012 from what i understand

[luckydip]

A couple of things to check:

see if removing the webcam cable makes any difference - clean/check soldering on connector

check around the SMC for corrosion

remove battery level indicator cable and test

check trackpad cable/connector for corrosion

[tintin007]

Hi,

I have a resolution. I found some corrosion on pin 2 of r5054, Replaced r5054 as it was open. also cleaned corrosion around pin 2. Macbook now runs happily. Looks like this goes to a bi line on the CPU_PECI. Cheers for your advice