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No Title IT'S ALIVE!!! ....but with a cracked screen . :(

This will be fun. The fact PPBUS is going down probably means too much current draw on something. It could be literally anything

Voltage on backlight output?

OK, this could be dead SMC, dead CPU, Corrupt ROM etc... SMC_DELAYED_PWRGD is low because the CPU isn't talking to the SMC to send out PGOOD. Your sure you have pp3v3 and pp5v_S5 correct?

This is going to suck. PM_DSW_PWRGD and SMC_DELAYED_PWRGD present? Your issue isn't no PM_SLP_S4_L. It's PM_SLP_S5_L missing that is causing all your issues. Any pulse on PM_SLP_S5_L when first turning it on?

PWM 1 messed up. 5v to 0 and cycles. Cant get the SIC635 in the us so I will use SIC631s. Replacing all my fets plus the controller again.

So, FCCM is a apple term for ZCD enable - Automatic skip mode operation (ZCD) for light load efficiency. Irrelevant because we arn't even getting core voltage. Going to look at the PWM side of things now

No, suggest new computer

Exact voltage on PPBUS_G3H?

I give up. I checked the circuit high at low. Nothing. My only guess is the CPU isnt requesting GPU vcore. It has a SDA line that goes right to the processor. Anyway, this gets 4 min each side at 70c in the USC and if it doesnt work, RIP.

USB mouse flashes for a brief second so something is defiantly up with POST and the CPU. Im guessing its not posting because of GPU vcore being missing. Now to what FCCM means I have no idea. Im going to look around at similar intersil/renesas chips and see if I can figure out what that pin...

That would't be a random one then

You have to use the same SMC from the same board number!!!! No wonder it doesnt work!

High airflow. Start at 100C and work up to 400C then back down slowly.

Are you using the same SMC or just some random one?

This probably isn't the best place to request schematics.

Well, if you want to reflow , reflow it but it won't last. Please don't charge the customer if you do that and set no expectation that it will last more than a week.

100% dead GPU.

If a repair shop wants me to sign a contract, I tell them no. Send it just like any other store does. Experimac contacted me once and wanted me to sign something... NOPE. If you want to send me repairs, you can send them just as anyone else does.

Sounds like a dead GPU. If its not liquid damaged, UC'ing it won't do a thing.