Do you mean converting composite and/or component video to hdmi (or vice versa)?
If yes, then no, the RX-V375 can't do that. You'll want to look at the 475 or 575.
If none of what Foxy recommended helps to isolate the issue, I would contact Yamaha to determine whether or not you just got a defective receiver. There may be a firmware fix for it.
1. What was the make and model of your last receiver? What is the make and model of your sub?
2. Did the sub produce any sound when you ran YPAO? If not, the sub may not be hooked up properly, not powered on, or the volume was set too low. The volume on the sub should be at 50% and the...
Yamaha’s entry-level receiver in their 2013 line, the RX-V375, is a simple, non-networked, 5.1 model featuring lossless audio decoding, 70 watts per channel, 4K and 3D pass-through, and Yamaha’s YPAO sound optimizer. Home Theater Forum received a sample from Yamaha to review, and we put it...