I have a NAD T775 AV receiver that has long been plagued by issues. Despite a dead display-screen and random sound drop-outs while watching video, I really enjoyed this AVR. It just sounded really good to my ears. Unfortunately, the random sound drop-out is now a permanent drop-out so I'm debating on what to do.
I could just send the unit to an authorized repair shop and see what the diagnosis is. Even if I decide to have it fixed (which I doubt will be cheap), I won't use it in my main system because it doesn't support 4k HDR.
But rather than just letting a big black box collect dust, maybe I can gut the T775 for parts and create a DIY 7-channel amp with the components. Albeit a wild guess, I think the amp section of the T775 is probably fine and the problems most likely lie in the related electronics (video, dsp, etc). Just a hunch.
I'm not committed to doing this yet, just trying to flesh out the idea. Would appreciate any comments/advice/feedback.
I could just send the unit to an authorized repair shop and see what the diagnosis is. Even if I decide to have it fixed (which I doubt will be cheap), I won't use it in my main system because it doesn't support 4k HDR.
But rather than just letting a big black box collect dust, maybe I can gut the T775 for parts and create a DIY 7-channel amp with the components. Albeit a wild guess, I think the amp section of the T775 is probably fine and the problems most likely lie in the related electronics (video, dsp, etc). Just a hunch.
I'm not committed to doing this yet, just trying to flesh out the idea. Would appreciate any comments/advice/feedback.
Its most likely possible. Many recievers I've seen have discrete amp sections (I guess so they can reuse the channel design when they need a bunch more channels for the next 12.4 standard or whatever) See if you can find a service manual, it will provide some clues, but so will lifting the skirts to see what lurks underneath [emoji6]
Can be a good idea.
That NAD has analog preamp inputs for 7.1. Does the amp work OK if you just use those inputs only?
I was told before that the preamp inputs won’t work in isolation of the DSP board. But will give it a try and report back.
Its most likely possible. Many recievers I've seen have discrete amp sections (I guess so they can reuse the channel design when they need a bunch more channels for the next 12.4 standard or whatever) See if you can find a service manual, it will provide some clues, but so will lifting the skirts to see what lurks underneath [emoji6]
I have a copy of the service manual. Will post in the morning.
The pdf file for the service manual is too large to post whole. Here it is in 8 page sections.
Thanks again for any insight.
Thanks again for any insight.
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NAD T775 SM pg 1-8.pdf820.3 KB · Views: 133
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NAD T775 SM pg 73-80.pdf42.7 KB · Views: 63
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NAD T775 SM pg 65-72.pdf141.8 KB · Views: 66
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NAD T775 SM pg 57-64.pdf223.2 KB · Views: 68
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NAD T775 SM pg 49-56.pdf204 KB · Views: 54
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NAD T775 SM pg 41-48.pdf428.1 KB · Views: 67
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NAD T775 SM pg 33-40.pdf899.7 KB · Views: 53
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NAD T775 SM pg 25-32.pdf1.6 MB · Views: 67
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NAD T775 SM pg 17-24.pdf1.5 MB · Views: 46
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NAD T775 SM pg 9-16.pdf1.1 MB · Views: 76
The rest of the service manual.
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