MacBook shuts down randomly?
last week i replaced the topcase of my white macbook and it worked fine for me. After a week the Macbook shuts randomly down if i press the power button. Sometimes it directly shuts off when the apple logo appears but sometimes i can use my macbook for 5 minutes before it shuts down. The power cable is connected and works fine.
Please help me.
The problem could be related to your "new" top case power switch or else. To check it out: remove and disconnect the top case from the logic board, find the two power pads on your logic board (see pict), connect the magsafe power adapter to the macbook, briefly bridge the two power pads with a small metallic flat screwdriver and the machine should power on. If you have an external USB keyboard and a mouse you'll be able to work with the machine and check if the issue persist. If you don't get the random shut down then you'll know that the top case is the culprit.
Open this beast back up and spray a can of compressed air to remove all the dust bunnies from the vent and the fan. Remove the fan and remove all the thermal paste with isopropyl alcohol and reapply with new thin coat of Arctic 5 Silver. Re-assemble and fire it back on. Reset PRAM by by pressing Command, Option, P, and R keys at same time until you hear the 3rd Bong sound. Then you can release the keys. Now go into disk utility, select your hard drive at the left of the screen, and click on repair permissions at bottom of screen. Also, reset SMC. See if that don't do the trick for ya bud.
When this beast is on put your ear toward the back vent to see if the fan kicks on, because your fan may be dead and not cooling the unit down.
Get the free utility SMC fan control online and use it to control your fan speed to cool this beast down.