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I gave up checking around and took another U7400 from another board just on the off chance it was also bad. F'ing thing started straight up. No idea why the first swap was bad as it came of a nearly working board that just glitched every time you touched a ram stick of slot. Anyway, thank you...

Checked all resistors around U7400 against another board and nothing seems bad. I took U7400 off a board with a RAM slot issue so I shouldn't have fitted a bad U7400.

CPU is actually getting hot without a heatsink, but I only get 1mV on VCORE

Hi Duke, thanks for replying. Yeah 181k and 150k now.. 12.57v getting to them and 12.29v for U7400 side of R7403 with the same at pin 1 of U7400 12.35v for U7400 side of R7402 with 12.34 getting to pin 48 on U7400. I'm getting no output on pin 24. I'm assuming there should be a voltage going...

U7400 I get: Pin 46, 29, 19 = 5.1v Pin 1 = 12.29v Pin 48 = 12.34v Pin 43 = 0v Pin 11 = 5.1v Pin 6 = 0v Pin 8 = 0v Pin 21,22,23 = 1v I'm stuck

U1800 is warm but still no vcore. On U2650, I get: Pin 1 = 3.3v Pin 2 = 0.04v Pin 3 = GND Pin 4 = 0v Pin 5 = 3.3v

Just found R7402 (CPUIMVP_TONA) was 1.5mohm rather than 150k so swapped that out. Swapped U7400 also. Still no change though

Duke.. Pin 16, 17 on U7200 looked like they had crap on them before I cleaned the board and swapped it so it possibly sent 12v into the 5v line there.

Forgive my ignorance but I'm not sure what secondary coils are. Here are some voltages from what I guess is what you need. As to a USB mouse.. it lights up. Q7950 gives 3.3v on All_sys_pwrgd I'm getting full fan now also. L7520 0v L7510 0v L7550 0v L7330 1.5v L7260 5.3v L7220 3.4v L7100...

Im not getting PP5V_S4_P18v5s5 out of pin 1 on U5805. Am I supposed to get 18.5 out on pin 1 & 8 on this or do I only get that when the trackpad is connected?

Stuck 5v in it and U5805 got hot. Swapped that along with everything around it and I get 3.3 and 5v now. Fan still spins but no VCORE yet :(

Liquid damage near rear vent SMC etc. Came from another repair place that seems to have told a blind man to brush the board with his old toothbrush. Stuck it through the UC, plugged it in and get a green light but no spin. PP3V3_S5 is 0.0v with a 0.107v diode mode PP5v_s5 is 0.995v with 0.007v...

Yep SMC reball did the trick.. Case closed. Thanks for your help JohnB and Duke. Much appreciated :)

No Title And off with the SMC again :(

I've read that schematic wrong haven't I.. There needs to be a voltage (providing its lower than PP3V3 gate) on SMC_FAN_0_CTL doesnt there, otherwise nothing is being sent to the fan when the gate is open. Damn it.. Must be SMC then really. 0.001v on diode mode for FAN_0_CTL

In the OS, it shows the fan at 0rpm, so I'm assuming it can see that its not spinning

No Title Checked the voltage at J6000 fan connector and at Q6060 mosfet. The voltages seem fine as far as I can tell. The gate is 3.3v and the source is 0v ground but theres no voltage going to the drain (FAN_RT_PWM) I swapped out Q6060 but it made no difference. What am I missing here?

Yeah, tried a fan off a working 00165. I ran out of time before the end of the day to check voltages going to the fan etc. I’ll have to test that tomorrow.

If I boot it and run Macs Fasn Control, even that won't start the fan, so I'm guessing theres an SMC issue or something still. Any ideas what to check for the fan control?

Stuck the board in the mac, connected screen etc up and it starts, chimes and displays!! still no fan spin..lol :p