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any idea? My guess is U7000 but as it must be picked up from donor board that i dont have, before buying donor i want to be sure if you think same.

PP1V8D_UPC_XA_LDO - 1.8V PP1V8A_UPC_XA_LDO - 1.8V PP3V3_UPC_XA_LDO - 3.3V PP1V1_UPC_XA_LDO_BMC - 0V (not shorted) PP3V3_G3H - 0V (not shorted) SMC_RESET_L 0V

Will check it later today and post result. Thanks

Got this board with U3100 burnt. Replaced it (twice because was thinking that may be first was deffective) With exactly same (B01 at the end) and now getting 5V, no amps. No PPBUS but not shorted to ground. All other rail except PPVIN_G3H seems be ok.

Yes, smc by pass first make fan spins for 1 second than stops, and than fan making "clicks" trying to sping but not spinning.

yes, it is pulsing up to 1.05 and goes down every few seconds.

PP1V05_S0SW_PCH_HSIO short disappeared, seems that U8005 was soldered bad. Now With and without resistance to ground - 450 Ohms and like before: with u8005 no fan spin without fan spins.

PP1V05_S0SW_PCH_HSIO is shorting to ground when i put U8005

When U8005 is removed fan spins but no image no chime.

i retake this board finally. Anyone can help me with that? Run from charger, charge battery, but not running from battery. The only way to run from battery is to boot it in smc bypass or boot with magsafe connected and disconnect if after booting

yes. Changed ISL and that 3 resistors. Seems to charge a bit slow but may be because the battery was completly out. WIll make full cycle of charge/discharge.

Autoreply: R7052 and R7021/20 were bad

Hi, No water damage. Already changed ISL and now after change (still not connected battery and magsafe) pins 17/18 is 65 Ohm and 27/28 2.7 Kohm. What it can be if replaced twice ISL and measermunt are still incorrect. What componentes create 20 and 3-4 ohms resistence on that pins?

@2informaticos you still think its bios with this symptoms? PLT_RESET not pulsing

i dont have programmer, because i dont have many efi issues macs. Usually i buy clear efi and never had problem with that. P.S: Soldered back U8130 and nothing happens now. Main S0 rails pulsing, without U8005 fan spins (just spins)

I have just found that U8005 had corrosion. Changed it and now fan stopped spinning.

well, as i have not medusa, will buy chip and once it arrived will back with result, Thanks

without U8130 fan spins, doesnt stop, but nothing getting warm.

Yes, PIn 7 and 3 are pulsing up to 3.3. and Vcore is also pulsing to 1.05V. P.S. when i measure pin 7 on U1950 sometimes fan spins and but there is no image. :S Same happened when measered PLT RESET, but when not starting PLR doesnt pulse

Got this board, no liquid damage. Green/orange light, fan try to spin and s0 rails pulsing. ALL SYS also pulses. Already checked all traces on U6100 and resistors on SPI Bus Series Termination and all are ok. No visible damage. My guess is U6100 but i dont have medusa for now. Anyway to...