Search results

I replaced all the CD3217 chips and reflashed all 4 rom chips for the CD3217's, but still had the same issue. I was checking in diode mode on the debug connectors JG200 and JF200 and noticed different diode mode reading for some lines that were supposed to be the same. This lead me to finding...

Yes I tested with 140w USB-C charger and Magsafe 3 cable. Both give me the same symptoms. I do not find any shorts around CD3217's and all of them look clean. I tested with the computer booted on battery and all USB-C ports read my USB drive correctly, so not sure which CD3217 could be the...

Hello. I got a 820-02098 that had physical damage to U8100 by whoever previously attempted to worked on this. PP3V8_AON was shorted to ground because of this. Also had a short on PPBUS_AON which ended up being caused by C9222 exploding on the board. I replaced C9222, U8100 and some caps around...

I have seen this happen when someone tries to get around the activation lock by changing the serial number in the T2 rom chip (U4770) on the board. You can change the serial number on this chip but when you try to activate it, you get this message because the serial number does not match with...

It was UF980. With the charger connected, I was getting like 2.5v on USBC2_CC1_CONN but 0v on USBC2_CC1. Replaced UF980 with a chip from a donor board and now this port gives me 20v and works correctly.

Ok I tried that and now I get 5v 260ma for the first few seconds and then it drops to 5v 50ma. PPVBUS_USBC2 is 5.12v but PPDCIN_AON is only 4.76v. PPBUS is now 12.01v.

Does it need to be 5A? The highest I have on any of my donor boards seems to be 2A

Also changed UG000, no change. Checked diode mode values on JG600 and they all match with JF600/601. It seems this CD3217 is not communicating with the ISL or M1 to generate PPDCIN voltage

Yes I have changed UG400 and there was no change

Already replaced FG200. I have 0v on both sides of it.

I have a 820-02098 that had liquid damage on the UG400 side of the board. Liquid damage was moderate. I cleaned the liquid damage and replaced a bunch of corroded caps and resistors. I get 20v and the board turns on and boots to the OS when using any of the ports on the left side of the mac, but...

Hello. I have a 820-01700 board that had liquid damage on the right side of the board and PP2V5_NAND_SSD0 was shorted to ground inside of the board, under C9587. Since the short is inside of the board, I cannot clear the short. This board has 512GB SSD, so 5 SSD chips total (4 on the right and 1...

I got some free time to look into this again and decided to remove U8600 from the board. There is continuity between the pads for S3X_PFN, so the trace was not broken. I think U8600 had some broken solder balls under it though, so some signals were probably not connected. I reballed U8600 and re...

Yea I compared voltage with the good board both without sound playing and with sound playing and the bad board has 0v on most of them when the good board does not. Seems like damage to the M1, but its just weird how I cannot find any rails or signals that are shorted, or even low diode mode...

Yea both left and right audio have the same issue. I removed all 6 amps from the board and it still doing the same thing. I obviously get no sound without the amps but I can tell the computer is still freezing when you try and play sound. everything works fine with head phones though. Any idea...

This is a 14" M1, so there is no T2, but I checked all the lines that go from the speaker amps to the M1 and they seem fine and match with a good board. I2C_SPKRAMP_L_SCL - 0.319 I2C_SPKRAMP_L_SDA - 0.317 TDM_SPKRAMP_L_BCLK - 0.339 TDM_SPKRAMP_L_FSYNC - 0.338 TDM_SPKRAMP_L_R2D - 0.338...

I2C_SPKRAMP_L_SCL - 0.319 I2C_SPKRAMP_L_SDA - 0.317 I2C_SPKRAMP_R_SCL - 0.317 I2C_SPKRAMP_R_SDA - 0.317

This board had some pretty bad liquid damage and partial short on PP3V8_AON. Almost every component on the board had some level of corrosion on it. The worst areas were around the ISL9240, the 3v8_AON MOSFETs and the speaker amps. I had to replace the ISL and almost all the caps and resistors...

I checked diode mode values on all of the pads for U9300 with a donor board and it seems I have a broken trace on pin 19 of U9300, S3X_PFN. That pad is .456 on a donor board, but OL on this board, so it not connected to U8600. That was the only issue I found. Would that signal cause U9300 to not...

I am sure I soldered it properly. PP3V3_2V7_NAND_VCC - .336 PP0V9_SSD_FIXED - .296 PP0V9_SSD_REG - .245 PP1V2_SSD_HOT - .307 PP1V2_SSD_COLD - .279 PP1V8_SSD_COLD - .294 PP1V8_SSD_HOT - .370