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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...
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...
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.
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...
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
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?