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I bought the S-UEM2 device and decided to go back to work on that abandoned mac. It showed changes in some pins of the UB300 (31, 33, 40, 42), as it had already been changed, I tried to change it again.

I didn't use it, I didn't have a C version. Do I solve that first?

I tested removing the CMOS. Bad U7600 voltages. I'm going to put only the pins that have voltage. - 4 - 5v - 5 - 5v - 6 - 0.3v - 7 - 0 - 12 - 4v - 15 - 4.6v - 17 - 12v - 18 - 5v - 24 - 0.5v I replaced the U7600 and the problem continues. No LEDs.

Device dead, no LED lights up. I tested with another source and nothing. I have PP12V_S5, but on Q8470 pin 4 (FET_EN_P12V_S5_R) has 10v, so I changed Q8470, but it didn't change pin 4. I don't have this new component, I removed it from another identical board. Any tips to find out if the...

You are magic! Mac working again! Now I'm going to test! thank you very much!

After changing Q7260/61, now I have stable 5v on PP5v_s5, L7260 and PP3v3_s5 line! But the board didn't turn on, is it because of the resistors I removed? Can I put it back?

During testing, a short appeared on the U4800, but it wasn't the problem. I compared in diode mode the L7260 (0.420) and the PP5v_s5 line as well (0.520), both equal to the good board. I keep the R7911/12/14/78 outside, right?

yes, I removed them all! I have no pulse on the L7260

nothing friend! I removed the components you mentioned and the same thing! this board is crazy! When in doubt, I changed the R7267/68 or u7200 again

I found something strange! R7267/68 that I had tested, now they don't go up to the correct value. They stay at 5k, so replace both. They were OK, I put the charger to test, it didn't work. They went back to 5k.

I had already checked these components, all ok. The R7367/68 would be the R7267, right? all ok L/Q7260.

I removed the jumper and the R7978. PP5v_s5 floated again and the L7260 is 0v

Yes, the two stable lines with the jumper

No history. Some oxidation spots, which I've fixed and tested. Nothing line related. Yes, I only tested the board. With a short between 1 and 6, the PP5V stabilized.

Line PP5v_S5 and PP3v3_S5 floating 0 to 3v, I looked for a short on the secondary lines, I did not find it. I tried to change the U7200, without success. It didn't work with SMC bypass, it didn't work! Stable PPBus at 12.6v. SMC_PM_G2_EN is floating

Thanks with the help!

Sorry, missing information. Coil voltages and diode mode - L8100 - 1.2v / 0.216 - L8102 - 0.9v / 0.089 - L7410 - 0v / 0.003 - L7430 - 0v / 0.004 - L7210 - 0v / 0.008 - L7230 - 0v / 0.007 - L7290 - 1 / 0.018 - L7030 - 12.4v / 0.457 - L6960 - 3.3v / 0.418

No error in DFU mode. It completes the revive and restore process. I have the S5 line voltages

Board is perfect, no oxidation or short. It has 20v and draws 0.2a from the source (without battery). Trackpad has click. In DFU mode, I tried Revive and Restore, both complete without error and Configurator gets padlocked. Audio card is perfect, but I tried to connect with it disconnected, it...

I figured it might be iGPU. Thanks a lot for the help.