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I found a short on PP1V05_SO, I pulled L7620 and seen it was on pin 2. So I tried some caps above it and pulled U7600. Short still there. So I injected 1.5V into C7660 and see that U1400 gets hot first when freeze sprayed.
I can assume u1400 is bad, correct?
I did a USC at different angles also...
For BIOS I can just pull and put on another, nothing special I have to do?
I will try !
Question: so if there was a light on the mouse, then you say its brain dead?
With USB mouse attached it will blink the light for 1 second and thats it. In my HP laptop the light stays on. So I am assuming a brain-dead board? And with a PC USB keyboard and shorting cap on and holding Window key, Alt, P, R does nothing. Tried all several times. Pulling the plug on life...
...............I don't have the history, the person it came from doesn't know either. It seems very clean and untouched. Runs nice. I know it is no use measuring everything if have VCore, ALL_SYS_PWGD, & SMC_ONOFF (or is my thinking wrong)? I will get a mouse and keyboard...............
[I was...
Is external keyboard mandatory? & it has to be a USB keyboard and not a wireless keyboard, correct? & I imagine it has to be an Apple keyboard for the option and power button right? LOL
No water damage, no visible corrosion.
Tried PRAM reset with a new keyboard (don't have external), connector looks good.
Tried SMC Bypass, Safe Mode, known working drive.
Don't have USB mouse, used iPhone w/ammeter and see that it is charging the iPhone 1.5A I think it said.
VCore is 1.74V...
A1466 came in stone dead. No PPBUS_G3H. Resistance to ground was near 0. So I injected 4.0V into G3H and see that Q7560 go hot. Changed it and only got 0.5V on G3H. Found F7140 was no good. Changed it and when I plugged in DC power Q7560 started to smoke. I see Q7560 does go to ground, so it is...
Think it is most prudent to take a known working SMC out of working MacBook to test. Will try this, then order another chip. That will narrow down the variables.