820-3209 boots but no chime/runs slow

[ytesfay80]

I have a macbook air that i booted up with a mac os on a usb(no ssd) and it booted fine but there was no chime and it runs slow. I replaced the keyboard due to a sticky spill but there doesn't look to be any liquid damage on the board.

Here is a video I took of the Activity Monitor screen of the computer when I booted into the os with my usb. The video is after about 15 minutes after booting. Should the cpu % be running that high for that long
https://www.dropbox.com/s/zopvpb6kiughyc7/0000-4432.avi?dl=0

I am not sure exactly where to go next after measuring the "Chipset "VCore" Rails". Here are the measurements I received.

PPVCORE_S0_CPU - 0.84v
PPVCORE_S0_AXG - showed 0.99v for about 4-5 secs after plugging in charger then 0v afterwards.
PP1V5_S3_CPU_VCCDQ - 1.5v
PP1V05_S0_CPU_VCCPQE - 1.05v
PP1V8_S0_CPU_VCCPLL_R - 1.8v

These measurements were made with the board/fan/ioboard isolated from the rest of the computer.

 

[ytesfay80]

These are the voltages for U6100 (SPI ROM)
Pin 1 - 3.33v
Pin 2 - 3.33v
Pin 3 - 3.33v
Pin 4 - 0v
Pin 5 - 0v
Pin 6 - 0v
Pin 7 - 3.3v
Pin 8 - 3.33v

 

[appleonarim]

Did you try SMC reset? Battery is installed on machine ? Do you have ASD for test hardware can you write result?

 

[ytesfay80]

Thanks a lot man.
I would always test it without the battery installed because I was lazy and didn't want to keep taking it out.
Now that I plug the battery in the cpu is running at less than 1% and works perfectly. I never knew that would cause the cpu to run higher?

Do you know why is that the battery would put less load on the cpu?

 

[appleonarim]

Im not sure why but after 2013 and later build machine SMC talking with battery if its not meet request or its cant talk create this problem.

 

[larossmann]

run asd and see if there is a sensor issue. has the bios ever been flashed/chip changed/screwed with?

 

[ytesfay80]

This is a 2012 so I had to do apple hardware test. The computer doesn't run slow anymore since I plugged the battery in but it still doesnt chime. Should I worry that it doesn't chime or is that an issue I should fix now.

 

[dukefawks]

Do a PRAM reset first. All audio circuitry is on the IO board, so could also be bad IO board or flat cable.

 

[ytesfay80]

Thanks duke. I made another silly mistake. I only had the right speaker plugged in thinking that the chime would sound from either speaker. Issue solved.

 

[dukefawks]

Chime should come from either speaker on an Air as far as I know. Only on MB Pro it comes from sub woofer.