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Just to clarify.. fixing the display connector solved the chime loop issue?

Yep. usb. Thanks Duke

Idk off top, more likely than not. Check the part numbers on schematic against each other. See what Duke has to say before replacing, it may be something simple.

Spotted a pre-balled on eBay recently.

Look close at u5450, u5400.

r1800,01,02, and r1803 within spec?

Gave it another shot with different 8500. Hit and miss access to osx. Mostly miss. still unable to access EFI. Seems deeper than bad/wrong modules? Where can I head to as this juncture? Really appreciate the help Duke!

.336 - pretty sure it's safe from shorted as it powers on?

Try U7950 and U2600 rather.

Grading folks, This one is doing me in. History LD. Attempting to boot to OSx results in a hanging pinwheel. ASD EFI hangs at "loading video controller devices" yet ASD OS loads without issue. I'm using an external keyboard and mouse so palm rest sensor trips, all other sensors are happy. I'm...

Google is your friend. Disregard, I misread your post.

Fair enough.

Smc_onoff_l voltage? does pm_slp_s4_l pulse just after power applied?

Many thanks!

Voltage drop to ground on pm_slp_s4_l in diode mode? Voltage on smc_on_off_l? u6100 termination resistors within spec? Traces between intact?

Datasheet seems to be lacking the pitch info. Does anyone know what I'm meant to be looking for in that regard?

Did you come across any corrosion or tell tales?

Let's see if we can get all s5 rails before looking into FireWire/ether net. The reading on s3 is negligible. Voltage on pm_slp_s4_l ?

Ppbus_g3h is one of the power rails on the board , you can find the voltage on the rail using a multi meter. Chime . Aka the sound emitted by a healthy macbook right after powering on

Despite my attempts on the googles it remains unclear where to find a bga stencil appropriate for gmux reballing. Specifically a 2850 (as well as subsequent mlb's.) Any hints about proper dimensions or adaptable arrays would be greatly appreciated. Thanks