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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

i got this when i measure on L7310 and L7320 and c1088

on 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 ? or the problem is around this .... THX

just when i connect the charger PP5V_S4 is jumping once an then stays down PPVRTC_g3h is 3.32v constant

allso the area around u1900 is clean and no pads are corroded

no corrosion the area is like new .. Charger is 60w and is the original one pp3v3_sus is present on pin 8 Thx