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All volt voltages after power button just pulsing. g3h bus = 8v constant pp3v3 s5 = 3.3v constant 5v s4 = goes to 5 then drops s3 voltages same s0 same v core =jumbs to 1.7 and drops all these voltages just comes for seconds of time also PLT RST comes 3.3v and drops

need board view file

tried both without kbd also appears dfu

showing this error while restoring "Unexpected device state 'DFU' expected 'Recovery' (Probably forced into DFU mode externally) [com.apple.MobileDevice.MobileRestore – 0xFAE (4014)]"

why laptop force directly to dfu when connecting to Apple Configurator it going directly to dfu without pressing keys

Gave up waiting for device to transition from DFU state to DFU state. [com.apple.MobileDevice.MobileRestore – 0xFCA (4042)] can you please explain this error

RTC_RESET_L PCH_SRTCRST_L PCH_INTRUDER_L PCH_INTVRMEN_L all remains steady and 3.3v

yes tried me bios /another working bios but same result all voltages steady including SMC_ONOFF_L ,SMC_TPAD_RST_L. I changed smc still same condition

yes but not get /share please if u have

I don't have t2 rom file

thank you for sharing

can you tell me the resistance to ground for PP0V9_SSD please.

the problem with mlb 820-00850 is dead getting into dfu mode but can't revive/restore checked -getting all awake /slp but ssd voltages not getting PP1V8_SSD= 0v and resistance to ground 29.5kohms(high) PP0V9_SSD also 0v

then give me that .

please share power up sequence for this board (not in logiwiki)

same conditon

yes tested board with dc jack and speaker only

also the same happens in smc bypass mode

tried with different ram slotes display not coming only repeated chime sound

neat and clean 820-3115-b board turns on and chime sound coming, but chime sound repeats display not switching no voltage drop found all coming continously even it chimes again and again tried clear me but no changes.