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denon avr 1713 freezing

hi,
my denon avr 1713 is freezing when playing a song via usb. recently the unit repaired due to power failure detection , power supply voltages were ok. but there is a overheated ic in the HDMI board . so. we could not diagnosed the real problem, so we remove the power failure detection regulator, its works fine now without restarting. at that time we remove the ribbon which connect to the front panel. what will be the problem.
tks.
 
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