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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

Okay, I've gone back through checking the rails... PP3v3_S4 boosts twice the same as every other S4 onwards rail, but after the others boost twice, they drop to 0v. PP3v3_S4 drops to 0.45v and sits there. The damage was in the U3210 area, so I swapped out U3210 to see if it made a difference...

So with the U6100 attached it boosts twice. Without it attached it boosts constantly. Is that it then? Bin it and replace the board?

We use this stuff in 0.038mm or 0.51mm dia (depending on stock) its 60/40 solder with 1.1% no clean flux core.... not that you wouldn't clean after anyway :) Comes as a 500G reel so should last a fair while. https://www.somersetsolders.com/tin-lead-solder-wire-with-rosin-free-flux/p180

Without the bios, its boosting PM_SLP_S4_L and VCORE in stages by the looks of it. So it boosts after every 2 second pause and changes the voltage up or down each time in a cycle. VCORE = 0.08v (pause) 0.12v (pause) 0.24v (pause) 0.53v (pause) 1.1v (pause) 1.3v (pause) then does the same in...

Okay, I’ll give that a go and see what it does when I get back to work on Monday.

Nothing obvious near the cpu at all. To be honest, apart from the backlight chip, there wasn’t much anywhere. Do you mean if remove the bios chip entirely and then connect the MagSafe, it should power cycle constantly?

From checking a bunch of S0 rails, they all seem to do the same boost twice and then give up

The U6100 I tried was from a 2015 00165 board and this is a 2017.. would that make any difference? I could always try ordering in a new U6100 with a clean ME just to be sure I suppose.

Maybe the bios was no good off the scrap board. What do you think?

I'll swap it back again. I don't understand why I get VCORE boosting twice but no fan spin. What should I look for?

Swapped the bios but no change :(

Okay, I’ll give that a bash tomorrow, home time in the UK now :)