Recent content by calbuh

unfortunately no result. Same problem. Any other suggestions PLS?

J9600 seems to be ok, i eaven clean the conacts with contact cleaner. When i try to boot with install usb stik i ghet the same error "that something is wrong and needs to reboot". if i boot from a live stik it starts loading and it gets stuck at 2 minutes remaining. If i remove j9600 an boot...

Hi. I have a problem with 820-00928-a . This mac is not booting . Some times it says that something is wrong and needs to reboot and keep rebooting. Some times the apple logo appear and remain stuck at spinning circle. If i enter in apple diag. and do a ssd diag. it keep searching the ssd...

Thank_u for your patience. After looking again and again through microscope seems that the only area with corrosion is r7752 and r7753 (seen in picture) I also noticed that the only rails that are not jumping is pp5v_so, pp5v_s0_cpuvr, PP5v_S0_vmon ( neither of these have short to ground)

u are wright it is the power adapter. i have used the original apple power adapter provided by owner. it seems that they give-me the wrong adapter (a 45 watt one) note to me NEVER TRUST THE OWNER :) THX

Hi My second apple board is a 820-3332-a that is not starting i have green light and orange right after in smc bypass mode is starting and enters in os i have noticed that when battery is connected and i plug magsafe both fans are spinning but more like starting ,stopping and so on i would...

I have noticed that on cpu_vccsense_n i have 0 volts to the ground ( on diode measurement) and 1.1 ohm to the ground, both c7261 and r0960 are ok is that normal ? on u7200 i have 12.53 on pin 17 and 0.52 on pin 8(cpuvr_fb2) nothing else

PPVCC_S0_CPU i have noticed that i have only 10.6 ohm to ground and, on diode measurement i have 0.0006v, is this normal ?

ieee I am the lucky one :( my first apple mb and is a nightmare THX

also on schematic PPBUS_S5_HS_COMPUTING is 8.5 v but i have 12.5v is that normal?

i have check 2 times for a short on all voltage rails and i was unable to find any shorts bu t i have noticed that on pin 16 (u7501) there is 1.02v but before r7562 is 3.3v . on the schematic says 3.3v it is that ok ? P5v_S5en is 3.4v ?

sorry my english is not so good. it is not pulsing only one jump when i connect the charger ... same thing whit other s0 and s3 voltages for example with p1v05s0_en, and the SPI lines are ok, clean and all the resistors have the correct values

pin 8 on u 1950 is clean and pp3v42_g3h is present, in smc bypass mode: I hold the power button connect the charger - amber light, release button - solid green , press button nothing happens.(green turns to amber) i have noticed that also PPVCC_S0_CPU is jumping when i connect the charger.

i have measured all s0 and s3 rails and no short to ground .....

sorry to many zero 0.006v