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Do I need an external Programmer for this?

Hi, after a bit of a break from board repair due to personal reasons im back at it again! I bought this A1502 13" late 2013 retina which has a super weird issue! It works just fine for a while but after like 30 minutes it cuts out and sometimes won't power up until you let it sit for a while. I...

Back to this old thread after over a month. Got a replacement U1950 in, made no difference. Also tested the original one on a known booting board and it worked. Any other ideas on what I can try?

Used a genuine 85w charger for these measurements

Yup, identical board. SMC_RESET_L is 3.38V PM_BATLOW_L is 0V SMC_PM_G2_EN is also 0V

Hi, have this 820-3462A A1425 2012 13" Retina Board that used to have a shorted SMC. Well I finally tracked one down an replaced it. Board still won't work though. It does have the orange light (so 3V42 definitely working) and PPBUS_G3H is normal. Any suggesting? Which rails should I post?

Hi, have a question. Is there anything theoretically possible to fix a1534 MacBook 12" Units with failed SSDs. I mean you can fix failed iPhone NANDs by replacing them and reprogramming the new one. Something similar possible here?

Okay, I think problem solved! Turns out U6900 had corrosion on it. Replaced it and it appears to charge again and the light works again

Did some testing: - Disconnecting J6955 makes no difference - It doesn’t turn on with just a charger, however disconnecting the battery after it powered on causes it to continue working off the charger - PPBUS_G3H with the charger only and the machine off is 12.62V - Requested U7000 Voltages...

The charger is known good

Hi, I have this mid 2012 13” non retina here for repair. It initially wouldn’t power on no green light or anything but it works using a charged battery. If I plug in a charger there is no light, although it does show the little symbol on the top menu bar under System profiler it detects a...

Pull up resistors? R5068 and R5067 aren't actually populated...

Quick Question: Noticed there are 2 lines going to the SMC. Are they required or are they just used for monitoring or something?

Here are some readings without the drive plugged in: SATA_SSDRHDD_R2D_N - OL SATA_SSDRHDD_RC_N - OL SATA_HDD_R2D_C_N - .330 SATA_SSDRHDD_D2R_N - OL SATA_SSDRHDD_D2R_RC_N - OL SATA_HDD_D2R_N - .360 SATA_HDD_D2R_P - .361 SATA_SSDRHDD_R2D_P - OL SATA_SSDRHDD_R2D_RC_P - OL SATA_HDD_R2D_C_P - .333...

Update: Someone told me it could in theory be a problem with the bios. I changed the SPI flash with one from my donor but that didn’t change anything

This one will be tough I already know that... I hope I can at least fix that A1425 one more easily...

Yup it sure is. There must be some massive short here because the power supply output is dragged down to about 5v with a current draw of the maximum 5A.... Cleaning it did nothing it still smokes like crazy whenever I apply power. Also no more green light...

Oh sorry I thought I posted those too guess I accidentally deleted the post instead of posting it or something like that... But tbh I don't think the other Voltages will be required. Upon plugging in the Charger with the DC Supply it went green and then orange before literally burning a hole in...

The drive isn’t APFS as it’s running Mavericks. None of the resistors were physically damaged or gave non nominal readings. same for the new ones. Don’t have any history on the machine. I did boot a copy of Catalina from usb and it didn’t recognize the disk.