#1 MacBook pro A1502 (820-4924-A) no power, no green light on charger (Again)
da robgerr • 15 gennaio 2019, 15:42
Good afternoon friends of the forum, the macbook is back with the same defect, but I noticed a particular.When the defect (macsafe ligh turned off) is known that the oscillator Y5110 does not oscillate but receives the voltage of 3.3V. By placing the oscilloscope probe on pin 1, after a while the oscillation and the magicsafe light comes on and the Vcore of the CPU is created. I tried to weld a copper wire between C5111 and R5110 because I was thinking of some broken pcb but nothing. Can it be the faulty oscillator that resumes functioning? I also noticed that the machine when it starts, works for about half an hour and then turns off the screen, the light of the magicsafe remains on but if I remove the connector and reinsert it, the light will not turn on. My doubt is on the oscillator but I would like your opinion to understand if it could be the faulty smc. I checked the voltage on R5110 and I saw the voltage of 3.3V. Resistance R5110 is ok, 2.49Kohm