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Boot hangs like this: busy timeout [0], (60s), kextd wait(0): 'iGPU' Tried on a few different SSDs, same thing Any ideas how to fix this please?

Got a MacBook Air 2015 with fast fan spin. I installed iStat, never used it before. If are sensors listed but only showing a hyphen, are they fucked sensors?

27 / 28 = 20.02ohm Yes R7020 Same 6259 setup apart from the AC in threshold divider and VCOMP_R / VNEG_R

Nope, Fixed! The high PPBUS is why I posted this thread but it turns out I was using a bad meter. Had me confused for fucking ages! S5 rails where cycling so there was a short. Turns out it was on PP5V_S4RS3. Short removed, power on all fine :) Thanks for taking the time guys! Please mark...

It does not power on. PPBUS fluctuates, S5 rails fluctuate... So no power on :(

Hi. No liquid damage. PPBUS = 9.4V max unstable PP3V42 = 3V7 Max unstable S5 Rails also unstable, fluctuate all over the place. What now? Cheers.

Yep, I know.... These things are like a black hole. Every now and then I gravitate toward it and before I know it, I've lost an entire day. But, I post in hope. Never mind, it's going back. Thanks Duke.

PRAM reset, booted in single user and fsck -fy the OS? Booted from external drive?

All power is there for the time the fan spins, incliding CPU. i already put another SMC on there just to check if there was crap I could not UC out of there. Guess I'll check all the PCH signals and see if that leads to anything.

Have you checked for shorts on other rails and the 6259 Isense resistors are in value? Tried burning your lip on the board? You got a short somewhere probably.

Liquid damage minimal - R5117, replaced. Inspected board at 45x, no signs of further liquid damage. PPBUS = 8.6 3V42 = 3V42 S5 rails = 3V3 and 5V SMC_ADAPTER_EN = 3V3 PM_SLP_S5 = 0V PM_SLP_S4 = 0V No power cycles Any thoughts please? UPDATE: Replaced R1451 PM_DSW_PWRGD. Now fan spins up...

Sweet man :)

Well, that's a jolly good idea! The simplest solutions are always the best. Would you upload those icons somewhere please?

I had one like this a couple of weeks ago. The pad was stuck to the board with Pritt stick

A MacBook repairing plumber thought he could fix his audio by taking a drill to the headphone jack... you just can't make it up....

A single drive with lots of ASD partitions is all well and good but if you have "screw monkies" working for you, or if you don't remember off the top of your head what ASD is for what machine... It don't half get fucking confusing when you're looking at 10 different ASD boot options on a 13"...

Got one of these old 2009 machines here given to me. My tech took it home last night and messaged me to say the screen had gone pixelated. Turned it on at work this morning and it's fine. Just wondering if it's more likely to be a bad cap or more likely to be bad GPU? Sure I will test it, but...

I ordered some 2017 and got 1704 reballed shit. I have some DC1125 I'm never going to use because my Honton station just fucked up and I'm not about to buy a new rework station!

I got cought out with a mouse that did that. Had me stummped for ages.

I think that simply having a shit load of boards saves a lot of time. The human pick and place.... Or as Louis calls it "Monkey see, Monkey do". Looking at the correct values on the schem and then looking through a book of SMT components to find that value and package is looong.