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The SPI ROM has been tampered with. Flash the bios. You may need a clean ME, since the original may be lost.

Do you get 12.5v on pin21 of j9000 ? If so you have an issue with dc-dc boost circuit. Check if PPVOUT_SW_LCDBKLT_FB trace is complete. Check R9731/R9715 voltage divider. If all looks ok, including the LVDS connector get ready to replace u9701.

So to clarify, the board is stuck in S5 state ? Do you have a scope to measure clock signal ?

So now U7400 is heating up, probably due to at least one or more Q7400-03 Mosfets being shorted. If this is the case a very high chance the CPU is dead. Have you measured resistance/diode on L7400 & L7401 ? I really think this will be the end of this board unless your determined to pour more...

There's going to be corrosion somewhere. Time to inspect visually for damage.

Ok, Lets start with diode mode measurements on PP3V42 & PPBUS.

or U7000. But probably the SMC as already suggested.

Usually when PPVCCSA_S0_CPU is missing you don't get fan spin or PP0V75_S0_DDRVTT. I'd start with replacing U7100.

Diskwarrior will probably fix this. Why not try one of the free data recover software programs.

if you got really 16.5v on PP3v42_G3H, This board is toast Lets start with powerrails PPBUS_G3H = PP3v42 = PP5v_S5 = Then we can help you narrow the fault down.

Have you been through all the power rails ? Any missing ?

The solution is a new logic board. However before this check if the NANDs are getting power @1.8V. Voltage reading on C8801 & C8805. Check pull-ups on U8821 & traces voltage on U8800.

Kapton tape will do the job. Dont use super glue....

10.4, 10.5 and 10.6 willwordforsure. burn image onto DVD to install.

I seen this a few times on this board, always Q8930/Q8931. Pull the FET and check if its already burning a hole through the board.

Mark this as solved. Replacement SMC came from usual donor board, however looks like someone already swapped it. So correct SMC from used and we have image. Give away was it would only chime on power adapter, no chime when powered via battery. This prompted another go for SMC change.

Hey Duke, LCD is good, All cables look perfect, and nothing on internal or external. Mux Area looks perfect. Should I reball U9600 before starting to messaboutwith GPU swaps ?

This boardis trolling me nicely. I doint know history of the board, its come from a long line of have a go repair shops. However thge board looked intact and not to dicked about with. At first, there was no chime. But ALL the power rails. I reflashed the bios, still no chime. I then replaced...

How many? PM details etc etc

Have you tried an external display ?