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The Mac had its logic board replaced in another service with a board that came from China! It arrived to me without working. All CD3215 chips were shorting the PP3V3_UPC, the U3200 had a burn mark. I replaced the four chips and the Mac turned on again, I tested all the ports, and the battery...

It does not recognize it in target disk mode or in the MacOs installer

Logic board is clean, without oxidation. I already cleaned the J9600, checked continuity. PP1V8_SSD_COLD - 1.8v PP1V2_SSD_HOT - 1.2v PP3V3_S5_SSD - 3.3v PP3V3_2V7_NAND_VCC - 2.6v PP2V7_NAND_PVCC - 5v PP2V7_NAND_VCC - 5v STORAGE_LB_EN - 3v SSD_RESET_LB_L - 3v LPSR_EN_LB_L - 3v Any tips? First...

I'm testing with an original 140w charger. Only the board, it is stuck at 20v and 0.08v. When there is a battery, the board turns on, I feel the trackpad click and it keeps restarting. C9522 was oxidized and shorted. but the problem continued. It goes into DFU mode, I just tried to revive, it...

I can't change the Q6970, I can't find this 649135PBF anywhere to buy. But the iMac decided to work and has been working for two days, I'm testing it.

Sorry, I think now I understand. 3V3_S5 is stable. When I press the power button, it drops and goes back to 3.3v. The 12V_S5 has no drop. Do you recommend somewhere to buy the Q6970? I can't find it anywhere.

The schematic informs S5 (LE0301) (what did you ask?) Note: LED blinking when I press the power button.

I replaced the Q8450 once again, both times with new components! the problem continues!

It worked for a few hours and stopped. Having the same problem, LED 1 blinking. I went to start checking the lines, it started working again. When there is a problem, 3V3_S5 is stable.

Thanks for the tip with the schematic! I re-soldered the U8470, the iMac turned on. I'm testing it now.

Board with LED always on, when I press power, LED 1 blinks. I'm using the data from 820-3478! Replaces the Q8450 and U8470 (FET_EN_P12V_S5 has 11.1v, even after changing) Any tips?

yes I understood! without the u3100 the voltage at C3105 is 0v.

Without the chip, the C3105 is zero. In OL diode mode. Good sign, right? My CD3215 chip is over, I'm going to order it and try to change it again.

I got a good board and compared some components in diode mode. I found pin 2 of the D7005 changed, I changed it and it seems to work. Mac running on battery and charging with magsafe 45w.

I tested with two CD3215 chips, same problem. There is no short between C3100/5. Could it be a short inside the board?

Sorry! I was searching in another topic about the problem and I was mistaken with the line: PP1V8_UPC_TA_LDOA

While it had battery power, the mac would turn on, but it wouldn't recognize the charger. I have 20v, the board starts to boot, pulls it down to 0.6v and restarts. I discovered PP1V8_UPC_XA_LDOD reading 3v on the UB300. I changed it, but the problem remains. But only when the charger is in its...

Good file, it worked. But I needed to change my recorder because of the 128 chip model.

I had already changed it, but I changed it again. Nothing changed!

I've already tested it with two original 45w. Both don't work. I don't have a fake to test. I tested two original MagSafe 85w on another Air working 100%, PPDCIN hit 16.5v too. This board is difficult! =/