Canon 760d (T6s) no power (DC powerboard troubleshooting)

Making one more question about faulty 760d so the main question is not too long...

Having trouble with 760d I've buyed on Ebay As-is have no power issue, checked usual things power switch, battery door and SD card switch and all of them work fine, battery is good, but now I am using dummy battery with bench power supply so i can monitor current draw...

So when camera is connected to power supply there is no life at all no lights or anything and draws 0.00A with main switch on or off...

The voltage goes in from battery to DC powerboard and there are 8.4v on some components...There are two connectors between DC powerboard and main board (on photo marked with "A" and "B") after some testing I've noticed that if I unplug connector marked with "A" (connector "B" still plugged in),

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powerboard starts drawing 0.11A, there are 1.2v on that connector on pin 1,3,7 (from left to right) and BGA chip marked with a red arrow starts warming up in the corner the arrow points at,

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it's not terribly hot maybe about 45-50C but as soon as re-connect connector "A" BGA stops heating up, stops drawing any current (0.00A) and voltage drops to 0v on every pin, if I unplug connector "B" and "A" is connected or unplug all connectors, nothing happens draws 0.00A chip doesn't heat up, tried re-flowing that BGA chip, no luck still same... so is that a problem with a DC board or a main board?

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