MBP 15 no signs of life

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hi folks!

have issue macbook pro 15, mid-2012. now, dead. didn't liquid or fallings, died in arms.
problems started that:
when connected charger didn't charge. no lights on magsafe remained working on battery.
checked charger on mbp , worked. tried other charger on mbp , still no lights on magsafe nor charging.
several minutes went , mbp died. can't turn on , no activity.
disassembled laptop , took out motherboard start tracing fault. tried turn on keyboard connector no luck.
measured magsafe board while connected motherboard , charger present. 0.9v charger connectors , 0.3v center pin. tried "brute force" charger turn on adding 4k7 resistor 1. , 2. pin on magsafe board. hear weak "sine tone" somewhere on motherboard , around 3v reading magsafe pins 1 , 2 still no lights on magsafe. conclusion:
1: drains power drastically
2: why computer doesn't let charger turn on?

have read numerous topics on mbp 13 issues lack finding clues on new mbp...

have ideas measure?

appreciate if give me datasheet mbp or schematics magsafe onewire system , power distribution system.
 



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