Search results

can't load boot menu doesn't respond to alt key and also not to command+r actually nothing response as long as the trackpad is connected also no usb keyboard, so there is no way to know if trackpad moves..

i will take out the heasink and look the RAM looks very clean on both sides.. one burned capacitor on the back near the RAM.. i will check the cpu area and update... btw, those chime loop is what called "beeps" that are related to RAM?

hi on the build in diagnostic it reports no issues... doesnt seem like it was messed with... it has something looks like red glue supporting the gpu corners, but could be the original... sorry for the question... but where can i get ASD EFI image for this model? thanks..

i got the logicboard alone, no OS or ssd as i mentioned... with the trackpad connected nothing respond not even usb keyboard, so even if i put an ssd with OS i always get to the flashing question mark... so i can't know if it moves.. i only get click when it's powers on... will try to check...

hi working on a liquid damaged 820-3662-a the board powers on and chime sounds again and again also, after smc reset or pram reset back to chime in loop... liquid damaged around d2920 c8300 looks also burned.. also around c8051 and r8052 haven't replaced anything yet.. anything worth to...

hello 820-3787-a stuck at halfway loading bar no liquid damage can't find damage under the microscope.. when i try recovery mode also doesn't load to the recovery, but stuck with the apple logo and halfway loading bar... also without the ssd... seems like doesn't detect the ssd, but could be...

hi i just put this logicboard into a working machine, and did some more diagnosing.. the trackpad is clicking when the machine is powered on.. with the trackpad and keyboard connected i can't even use usb keyboard BUT... when disconnecting the trackpad, i can get the usb keyboard to work when...

hi duke thanks for the quick answer i replaced the trackpad cable twice with two known good cables and no good... also, put another logicboard into this shell and it works good, detects keyboard and works well so it leads me to think that something is wrong with the board.. what can i check...

hello working on a 820-4924 board is very clean, no liquid damage.. keyboard does not work tried it on a different case with good known keyboard \ trackpad and all good cables - still doesn't work.. with external keyboard works fine.. the keyboard does work when clicking the power button...

hi ok will get a usb-c hub and check, because also need the charger to be connected.. the audio jack was connected, still no chime.. will update after checking with usb mouse..

hi so after replacing u4700 i got all the rails.. ppdcin_g3h is 14.7v and got cpu vcore (1.7v) after putting the board back to the machine i get no image on screen, no chime.. only feedback from the forcetouch trackpad when charger connecrted.. this is actually the machine from an older thread...

hi duke PPBUS_G3H is present (8.6v) the little led is glowing when connected... but still, no PP5V_S0 or PP3V3_S0 and obviously no cpu_vcore..

hello i'm working on a 820-00045 the board looks pretty much ok no liquid damage, doesn't seem like been tampered with before but still, no power... from reading around the board, i get this results.. On F4700 is 5.17v on both sides PP3V3R3V0_AON is 3.3v PP5V_S0 is 0v PP3V3_S0 is 0.020v...

does not respond to pram reset will try with external keyboard, if not work i will try to replace the bios thanks...

hi u6100 (the bios if i located it correctly) looks ok... the only area that really looks bad is where u7860 and u7865 (on is broken) is it worth replacing, could be the cause of cycling?

hello i have a problem with the 820-00138-a mid 2015 retina 15'' model... the board seem to be working, screen power on the apple on the back is light up both fans are spinning, but no chime or reaction to keyboard.. also no image at hdmi.. i want to do some diagnose and tried to get...

hi yes it is! PPVCC_S0_CPU going to around 1.6v and than back to 0, again 1.6v and 0...

hi this is correct, ALL_SYS_PWRGD is jumping to 3.2v than 0 ppv5_s0 is doind 4.8v than 0 both are pulsing... looking again, u7860 is actually broken on the side, i ordered a few of those and will replace the two... this behavior has to do with the u7860 and u7865 area? by power cycling you...

hi there 820-00045 no visible water damaged, unknow history does look like been worked before on some areas. the little blue led right to the battery connector is glowing but no image or chime, PP5V_S0 is missing, also obviously. no cpu vcore... ppbus_g3h is 8.6v PPVIN_G3H_P3V3G3H is...

hi anyone familiar with this ultrasonic? i got this one from a storage clean out.. seems to be working well, but only has a button for heat and button for on\off should it be safe to use on macbook logicboard with cleaning solution? on the back it says 50\60hz cycles volts 220 and amp 1.5...