Originally Posted by madaudio
Much talk of separates.
Have a T775 which gets very warm, and have already had to put in for repairs twice in last 4 years, and repairer told me it looked like some components were heat-affected.
I now keep the front of the cabinet open when in use, have added vertical space (about another 2") above.
Just wondering: do separates (NAD or other) have less of a prob with overheating??
NAD's AV receivers definitely suffer from heat issues in the module area. When my t785HD stopped providing surround sound and the display said "Check DSP Module", I bought a new AM200 card from my local dealer and replaced it myself.
Like many manufacturers, NAD apparently did some post-production modifications to at least some of their modules - adding a couple of jumpers and two capacitors to the AM200, which they glued down to the PC board with Pliobond glue. The thing about Pliobond is that when it is exposed to excessive heat, it "carbonizes" (turns from light beige to dark brown). In extreme cases, it will carbonize so much that it becomes conductive and can etch away circuit foils.
In the case of the AM200 in my t785, the glue spots closest to the front of the chassis showed large deterioration: it was hard and very dark in color, but it hadn't etched any foils. Still, that is an indication of relatively high sustained heat in that area. Another spot of Pliobond closer to the rear of the AVR was still light in color and pliable (hence the Pliobond name).
I had an email conversation with someone at Lenbrook and they also said their t775 got hot in the module area and he was going to relay the need for better cooling in that area to the engineers. Of course, since that was about a year ago and the txx7 series was already well into production, I assume modifications to the case will never be made.
In any case, I've resolved not to spend any more money repairing or upgrading my t785HD. When it fails again, it will be replaced.