Power on MacBook 12" A1534 without battery
My MacBook doesn't start and shows permanent the red bad battery sign like on an iPhone when there is no power.
This battery sign doesn't let me through any system. No BootDeviceManager, no Reinstall menu, no maintenance menu, No SMC reset, no NVRAM reset,...
Its just turning off after showing the red battery sign.
I would like to know, if I could bridge the battery contacts. So I could use it as a desktop PC and know if the logic board is broken or the battery.
Can someone tell me where I have to connect which kind of power?
What i found out:
- The big middle contacts seems to be the output pins with 8,59V.
- The Label on the Battery is telling me that it has 7,56V, which is the battery output?
I would assume that I could bridge the 8,59V pins to the pins on the right side next to the output, but I don't know if this is a good idea and if yes, which contact is plus and which is minus. And what is the single left pin for?
Would be cool if i can start this thing without the battery.
Es esta una buena pregunta?
4 comentarios
Did you get your system wet or spill something into it?
- de Dan
Hard to tell, a friend was giving me it as he never used it, so i could tinker with it :D. It was stored in the cellar :(. So it was just unused for about two years. I just tried to load the power for a whole day and night but didn't help. Keyboard isn't lighting as well but it seems that this depends on the power as i can't get to the reinstall and maintenance menu. I also tried to reset SMC, NVRAM, already. All i can get is the red battery sign.
- de Yuna Braska
@yuna wait don't try to apply any jumpers or anything right now. You're running risk of destroying your board forever. For proper troubleshooting I suugest you contact people like user @reecee on here https://www.ifixit.com/User/1358455/Reec... and see what he recommends. Trust his guidance on that since he is the expert.
- de oldturkey03
@danj @reece
Thanks for your help. I got a new situation now as i changed the power adapter to more power.
* battery sign is gone
* Processor starts working as its getting warm
* wired external mouse and external apple keyboard starts reacting (shift light can be triggered and the mouse LEDs are telling me that a computer is connected)
* Resetting PRAM works too according to the mouse LEDs and speakers which are turning on and of as long as i hold the keys.
Something seems to work....
* external HDMI Monitor is not getting any signal
* all internal funktions seems to be broken. No keyboard lights, and the internal display is not even turning on.
* Power Pads are working fine too as i could turn the battery sign on with them under low power.
Since i don't trust the internal stuff, i would like to set the default screen output to the external display. Is this somehow possible without seeing anything? Are there Pins on the board or Trigger on the macbook or shortcuts to pretend that the display is closed. I get the feeling that the board is broken but would like to produce at least something on the screen which is telling me that :D
- de Yuna Braska