Search results

Did not work. I mounted the logic board on another Mac, it turns on with a charged battery, but it doesn't charge. The board doesn't turn on by itself!

Sorry, but I hadn't noticed. but it fluctuates between 0.03 and 0.08. I have PPBUS_G3H (12.3v) and 3V3_G3H (3.3v) together. Yes, all USB-C ports the same. C7020 - 4.7ohms C7023 - 4 ohms

I've already tested it with others and the direct charger. Same problem.

yes, always with original charger! the 87w one!

Only the board on the charger doesn't turn on. It is at 20v 0.08a. The board with a charged battery turns on. When I connect the charger, it stays at 20v, goes 4a for 1 second and drops again. I checked all CD3215s and they are OK. In all of them I have the 1.1, 1.8 and 3.3v line. Just the...

Board still working. But, WiFi stopped. I found that PP3V3_G3S_WLAN shorted (diode mode 0.008). When I put it on the charger, the U3730 gets very hot. Is it worth changing?

I changed what you suggested and put in new chips (C3215). Board turned on again. Anything to pay attention to in testing?

Yes, original charger. It stayed on charge for around 1 hour. Then I turned it off, took out the charger. Today I went back to test, everything had toasted. The board is perfect. no oxidation. Do I put the new chips in and test?

I ended up removing them all. On each chip, the 3V3_UPC line was shorted, when removing the chip, the short ended. I didn't say it, but the U3100 was causing a short on the PP3V3_G3H_RTC line. Since I already made the mistake of removing them all, any tips?

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?