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sry, when i say turned on, i mean the fan is spinning, not neccesarily booting. if power button doesnt work, machine can only be turned on by plugging in magsafe.( turned on mean fan is spinning.) but mac doesnt boot. after the 3fan cycle, backlight comes for a split of second then no display at...

when power button doesnt work, macbook cant boot ( fan spin, but no display )

when power button doesnt work, i cant smc bypass on it. usually when smc bypass success, fan spin max and the magsafe doesnt light on correct ? but inthis case the fan spin normally and i got magsafe light.

i see a little bit of liquid on u6200. L83 vp is short to ground too. so I changed both u6200 and u6300 from 00239 board. I have probe nothing is short surrounding u6200 and u6300, but theres still no sound. no input output detected at all.. please help guide me for measurement.. thanks..

with only battery connected, amon and bmon is 0v if i only use magsafe amon 0v, bmon 0v. magsafe and battery together, amon 0.7v bmon 0v

2.8 and 20 ohm. currently mac still turn on with magsafe, but amon and bmon voltage is around 100mv, is that normal?

this morning , mac's power button works, but a few hours later doesnt work anymore. when power button doesnt work, mac cant boot with battery connected, but will without battery.

if I turn off mac with software, i can turn it on with power button. its quite difficult to describe the exact symptom, its not consistent. mac turn on with smc bypass.

I already used known good sparepart, all sparepart problem can be eliminated FOR sure. ( keyboard, trackpad, trackpad cable, io flex etc ) so when I plug charger, macbook turn on. but when using only battery, i cant turn it on with powerbutton or even directly shorting smc_onoff_l. when i tried...

both L1290 and L1295 have 1.05v at both side of the component. I dont see any related usb 3 thing to check anymore. can I assume this is pch no fix ?

i diode mode all that line. USB3_EXTA_D2R_N USB3_EXTA_D2R_P USB3_EXTA_R2D_C_N USB3_EXTA_R2D_C_P USB3_EXTA_R2D_N USB3_EXTA_R2D_P and the extb one too. no diode is shorted, the caps all have 0.310 at one side, and O.L at the other side, all good. is this pch problem?

i have ppvin_p3v42g3h, u7090 looks touched before by previous technician, so I replaced and I have stable pp3v42 and its turning on now, will get back later if something is wrong again.

1 0v 2 16v stable 3 4.3v stable 9 0v 12 13 14 17 19 20 27 midway writing this, found out pp3v42 is only around 1.8v pp3v42 diode mode is 0.278, good.

u7100 changed, all component surrounding has been checked, all good. board doesnt turn on with charged battery. ppbus_g3h start at 8.6v when i plug magsafe, and drop slowly till magsafe light goes off.

do you mean the usb3_exta and extb line ? all diode and caps is good and doesnt have continuity to its other end.

with fake charger, still the same exact behaviour. when i leave the board long enough, the ppbus will start at around 8v, and then slowly dropping to very low value. (2v or something )

the device will show and disconnected, show and disconnected, in the finder. the charging indicator on the device stay charging. both port behave the same, so im sure this is not a usb port solder joint connection problem

this machine come in dead. theres something to do with all sys pwrgd not showing, so I remove q8150. now machine turn on. a few weeks later customer say macbook cannot connect to device. i use my known good cable to my device, its charging but itunes doesnt detect device. I have discard all part...

diode mode with fuse connected : 0.110 resistance 17/18 27/28 3.5 and 20 ohm, normal. the closest value i found is at : L7130 : 0.115 L7630 : 0.120 the rest diode mode is around 0.300 - 0.400, looks good. L7310 and L7320 is 0.05, i think its normal. cant start in smc bypass.

hi, this came in with ppbus 8.2v i changed smc straight away, ppbus go 8.6v, machine turn on. a few days later,customer came, the machine is dead again. I see ppbus_g3h is 4v,sometimes 0.5v. I remove fuse, and I have 8.6v at pin 1. so it must be system side ? do i check for short one by one? I...