Inwerp
New member
Macbook air 2012 A1465, came with sporadical shutdown problem. After 3-5 minutes of high load, the laptop shuts down and then works 20-30 seconds till shutdown unless cooled for a while. Since CPU/GPU were under 60°C, i checked all voltages and some reset signals, on board and found funny slow linear voltage drop on RTC_RESET, changed batteries in my multimeter and immediately confirmed it with a brilliant solution by Dukefawks from this forum.
After i changed both caps, it started to work and here comes the stupid one.
To test the board with the battery i used SMC_ONOFF jumper near the wlan card. I was too stupid to check if there's something dangerous around it and i guess i shorted SMC_ONOFF with damn PPVBAT_G3HOT_CHRG_REG on C7045 which is happened to be just near this jumper. IDK if apple considers electrical safety but although i feel retarded enough for my mistake, i found it rather funny that they put 8V hot power rail just in 2mm from the power jumper, without even putting some sort of compound or glue.
Pic 1. Apple trap for big tweezers in shaky hands.
Now i'm having 1.7V on SMC_ONOFF, Keyboard power button drops it to 1.3V, and, of course, shorting it to ground does not turn the laptop on anymore, it starts only if i plug the charger in.
I am really pissed off with my stupidity but i am asking for some help.
Unfortunately, it's not C5734 shorting to ground.
However, i found that R5070 is nearly 1kOhm (10kOhm in schematics) in circuit. Is that possible that on higher load SMD resistors melt to lower resistance? Should i start searching for a new SMC and U5010, or it simply shorts my PP3V42 rail instead of turning it on?
Also, note to self: check SMC_ONOFF area for high power rails before you take your dirty tweezers in hand.
After i changed both caps, it started to work and here comes the stupid one.
To test the board with the battery i used SMC_ONOFF jumper near the wlan card. I was too stupid to check if there's something dangerous around it and i guess i shorted SMC_ONOFF with damn PPVBAT_G3HOT_CHRG_REG on C7045 which is happened to be just near this jumper. IDK if apple considers electrical safety but although i feel retarded enough for my mistake, i found it rather funny that they put 8V hot power rail just in 2mm from the power jumper, without even putting some sort of compound or glue.
Pic 1. Apple trap for big tweezers in shaky hands.
Now i'm having 1.7V on SMC_ONOFF, Keyboard power button drops it to 1.3V, and, of course, shorting it to ground does not turn the laptop on anymore, it starts only if i plug the charger in.
I am really pissed off with my stupidity but i am asking for some help.
Unfortunately, it's not C5734 shorting to ground.
However, i found that R5070 is nearly 1kOhm (10kOhm in schematics) in circuit. Is that possible that on higher load SMD resistors melt to lower resistance? Should i start searching for a new SMC and U5010, or it simply shorts my PP3V42 rail instead of turning it on?
Also, note to self: check SMC_ONOFF area for high power rails before you take your dirty tweezers in hand.
Last edited:
