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I discovered that the short comes from PCH! =/

Something very strange! I injected voltage into the line, but the only thing that heats up is the component I'm touching. I tested several components, always the same problem. The thermal camera doesn't find anything, only the component itself. I'm putting in 1.5v.

After replacing the Q7610, I checked the L7610 line in diode mode (0.450). The PP3v3_S5 line shorted out in diode mode (0.002). It was normal at the beginning of the tests, could it have been the Q7610 that fried something? Can I inject voltage? I am aware of the ISL62383C, that's why I...

I've been struggling with this board for days. I'm using the schematic: 820-00134 It arrived with a short in the 12v line, I discovered it was the CA706, I replaced it and the board turned on. But it lasted a few minutes and then died again. The Q7610 shorted, I replaced it and it didn't have...

Thanks for the tip! So, outside the board, they are OK. Any suggestions as to what could be causing these 8v?

The Q7520 does not have a short circuit, I forgot to mention it, but I had already replaced it, but it did not solve the problem. Everything is fine with the resistors! Comparing it with another good board, I found something different with the R7520. On a good board, the value increases, on a...

When connecting to the power supply, it quickly draws 0.600A and turns off, the cooler even starts to spin. The logic board had some oxidation on R8164, R3921 and R3558, I fixed everything and the problem persists. With the thermal camera I noticed that the U7600 and U7400 were heating up when...

I went back to work on the UR300 and it seems to have resolved the issue!

The device came into contact with liquid. It is close to the QF910, UF900, UF960 and UR300. I cleaned everything, replaced components and the Mac started working again. However, sometimes the keyboard and trackpad stop working. I connected external devices and they don't work either. However...

Dude, thanks for all the tips. But the customer gave up on the repair.

The situation has worsened. I no longer have 20V with the battery and the Mac no longer turns on with the battery. With and without the battery, I have 5V and 0.23A on all ports The LDOs are perfect. PPBus 12.2V. I tested the ports with the S-UEM2 and it did not show any problems.

It didn't work. It still doesn't charge the battery. I checked all the resistors near the CD3215, and I didn't find anything wrong. Any other tips?

I've never done this procedure. I need to look for the socket for this chip. Does the ROM have any specific files for this model?

Yes, I checked all the LDOs of the CD3215, diode mode and voltage, everything OK.

It seems the problem has been solved. Sound has been working for a few days now.

No history. The board is very well preserved, without oxidation or liquid marks. Sorry! Yes, it was the 3V3_G3H_RTC line. After a while without use, the board showed 0.380 when measured in diode mode, but when I put the charger in and took it out, it went to 0.120, 0.140! I injected 3.3v, the...

The device turns on normally with the battery charged, but the Mac does not recognize the charger in any port. With the battery, I have 20v 0a. Without the battery, the Mac does not turn on, I have 5.13v 0.23a. I have 12v on the PPBus. In the CD3215 tests I noticed that at times I have, in...

I waited for the sound problem to appear and compared pins 16/18/20 with another board! In diode mode, pin 20 was giving 0.120, while on the good board it was 1.700. I replaced C6602 and L6607, now it's the same and the sound is working. I'll keep testing to see if the sound fails again. I'll...

Imac with intermittent sound. Sometimes the sound comes out of the speakers normally and then switches to the optical output. The volume icon shows a prohibition sign. I tried changing the P2 connector 3 times, but the problem persists. I searched the forum for alternatives to "kill" the P2...

"So it stays on in boot menu?" Yes, it gets stuck in the Menu. It allows you to choose the boot option, but when I select it and press enter, it gets stuck with the boot options and doesn't even start loading. "It only crashes when try to boot OS, or ASD?" When I turn it on without the battery...