Onkyo TX Nr747 power on issue

i found that that the diodes which connected to IPROTECT and VPROTECT of MMCU are shorted and after removing it i checked the resistance of those two pins of MMCU it has very low resistance around 10ohm, then i given directly 3.3 volt to those pins , the shorts has been gone , but still its same condition, getting of after 4 or 5 second, also other input selection not working , but volume control works