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Replaced UC710. Now i get 3v3_s2. But machine still draws only 5V. it tuens and goes into recovery with wireless KB/TP icons coming up first though both seem to work. If i restart it will show the logo and the loading bar will go upto 25% and then reboot again into recovery. No FAN spin as well...

Replaced RP800. Issue Solved.

Corossion at RP800 and QP800. No shorts. PPVIN_LCDBKLT_F/N/R/P is 12V LCD_BKLT_R is 12V But PPVIN_LCDBKLT_Q is 3V and decreases to 0V. Should we replace QP800 ?

Perfectly fine macbook was kept for resale. it had a trackpad issue. trackpad was replaced . it was working fine. today suddenly it wont turn on. Drawing 20V and PPBUs is at 12.6. Nothing heats up. Was following the power sequence PDF i had. I get voltage upto ALL_SYS_PWRGD. I get voltage at...

Device was water damaged. Corossion at the trackpad and lcd connector and at U7270. PPBUS at 12.6V Thermal scanning showing U7270 heating up. Replaced it. Still a very very very low heat signature on U7270. Still the same. no mouse click. intial fan spin for about 2-3 seconds then after...

Removed all one by one and put in smc bypass. its still the same. no change.

Big Coils pulsing now. if i remove U1950 they are stable. Once i put it back or replace it starts pulsing.

CC714 Voltage was pulsing. . Replaced. It is stable now. Still no 3v3_s2. Should i tru DFU revive or replace UC710 again?

Yes i get voltages.

When everything is connected. the fan goes max instantly and then reboots after sometime. macbook detects on AC2 with a padlock sign. Tried DFU Revive. Stuck at Installing Software Midway with Fan spin at max. Then eventually it got cancelled automatically. Now it is stuck at 5V. No Fan...

Checked the resistors. the readings are okay with one leg removed - match with the schematics. RC712 is 126 kOhms. Removed CC719/20. Still the same readings

Still the same.

Resistance Across Pins RC709 is 15 Ohms RC710 is 0.8 Ohms RC711 is 2.2 kOhms RC712 is 35 kOhms RC713 is 27 kOhms. Traces look fine.

PPBUS at 8.6V. R2861 was busted. Replaced it. Device will not turn on. NO FAN SPIN. U1950 Pin 2 3.4V Pin 8 is 3.4V Rest all are 0V. L7430 is 0V. Diode reading is also 0.120.

PPBUS at 12V. Corossion near UC710 and UP7101. PP3v3_s2 is 0.4V - No shorts. PPBUS_AON_3VS2_VIN_ISNS is 12V P3V3S2EN is 1.8V i Replaced UC710. Now PP3v3S2 is 0V. Others remain the same.

Please reply

i have verifird that they are universal. Machine will not go in DFU. SOC_FORCE_DFU goes high to 1.8V but still nothing on AC2.

MFDF5804 and MFDF5808 are universal and interchangeable?

Injected 1V. nothing on the thermal camera. slight heat i think on the cpu. i assume CPU gone.

i removed both the caps and U7700. the short still remains. CPU gone ? i get 8V to 12.3V at PPBUS as well.