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i'm very very sad because i've deleted the post i've created some days ago...i will try to summarize as better as i can: 820-00840, completely dead not switching to 20v after changed 2 usb controller, 20v but no boot. all voltages present in loop. macbook like in boot loop. changed bios and...

Tried 2 differents battery, and 2 different power supply. Tried reset smc No luck Always green light Bolt symbol But system says not charging Any help? Thansk

i don't know the real history question folder at boot if i try to boot any os from usb, it goes to internet recovery i've restored in dfu (lock symbol on apple configurator) booted in internet recovery as soon as i try to go to Security Utility Boot , it says me that there is no...

hi to all motherboard is perfect. no shorts around usb-controllers i've 0V on PP1V1_UPC for each controller. (with cable connected) how is it possible????

Hi to all, I have an iMac 21 2011 Customer said to change the power button because it works only few times I’ve changed it and changed also the solder paste on cpu and gpu but now it doesn’t boot I have only led 1 blinking I’m very angry with myself because of not having tested it before...

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Hi to All! I have an iMac 27 2019, motherboard 820-01236 Dead. When i Connect power supply, I can barely see a light from the second led Nothing happens if i try to to boot the system I’ve Tried to Connect my power bench supply directly to the motherboard and I have this behaviour...

i don’t know the history of this board…I’m pretty sure that u3900 was touched/changed (i don’t know why) Motherboard boot with “no disk error.” Tried another disk, same error! It can’t see usb bootable from both usb USB stick light stay on fixed As soon as i try to boot in Recovery and...

PPBUS at 8.6V No Fan Spin I get Magsafe light (green than orange with or without battery) motherboard water spill (cleaned from another techician) 3V3_S5 present 3V3_Sus not present P3V3SUS_EN 0v PM_SLP_SUS_L 0v (no short) PM_PWRBTN_L 0,3v SPIROM_USE_MLB 0v S5_PWRGD 0v PCH_DSWVRMEN - 3,1...

i don't know the history of this motherboard...i've found in diode mode a super low value on pp3v42_g3h...removing l7095 and l7090, i've injected voltage on the line and found that u5000 become hot (3v 0,0100 amp) should i reball it? should i change it?

hi, please help! i have 820-01958 dead: no liquid spill or damage. amp meter stay completely off in both ports... i have 4ohm resistence on PP20V_USBC_X_VBUS and PP20V_USBC_T_VBUS If i go on those line with power supply with 1v 1amp, it goes directly to 0,27v 1amp in both lines but i can't...

hi to all, please help. motherboard is perfect, no signs of corrosion or anything else. both usb ports stays at 5v@0,04/0,05amps PP3V3_UPC0/1_LDO & PP1V5_UPC0/1_LDO presents PPBUS_AON 12.28v PP3v8_AON 3.8v PP3v3_S2 "bootloop" 2,8/3,0/3,1 PP1V8_S2 0V PP5v_S2 0v PP1v25_S2 0V any hints? thanks

hi! i don't know the history of this computer...it is completely dead, no status led at all..i already tried another good power supply without luck:.....any hint? thanks

HI!, i've never fix an imac. this imac doesnt power on. i've only the first led when i push the power button, nothing happens power button is ok could you help me? i don't know where to start! thanks

hi to all...i have this motherboard with orange ligth. connecting it to my power supply (15v@3a) i have a bootloop like 0,022 0,0055 0,0015 After testing all the power aliases page i think I am missing my S0 enables which looks like I need PM_SLP_S3_L PM_SLP_S3_L is 0v ,the line is not...

hi! i've received a a1466 completely dead. i've found water around u6101 and u1900 removed ics cleaned and soldered two other ic from donor board! all ok! today i 've received again this laptop...dead...again i've used some solder and flux on u6101 and again live! BUT... it is extremely...

Hi to all...820-01041 no liquid spill...3 usb ports stuck on 5v, the other port totally dead Because of a small journey, I’ve ask a friend of mine, technician, to change the controller corresponding to the dead port I don’t know why, I have changed all 4 controller now i have 5v@0,269 on all...

Hi guys i have an 820-00840 that not boot... (stuck at 5v) here there is the history of previous techician (i can't say if it is 100% true) macbook dead found a short with thermal camera on c3000 caps removed (not replaced) tried to charge -> smoke found u3100 burnt changed, no luck...