Question about NAD T762 Receiver

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Intermittend no audio from digital inputs, flicker video monitor out, volume goes up but not down

Lately the T762 has been acting up a bit. First I noticed that the monitor video out started to flicker with grey background as if the vertical sync is out, the OSD menu's almost useless. Then, intermittently, the digital input often stop working (not just one input, but any of the digital inputs that connected to PS3, Sattelite DVR, and DVD via either coax or optical links all exhibit the same behavior) The latest being that the volume goes up, but barely goes down, condition is worse with use of remote controller.

Except the flicker video out, the other conditions do not exist when the machine is cold. After having used for about 45 min to 1 hr mild use (ie just watching tv and relatively low volume) the condition started to show up.

NAD had yet to responde... has anyone had similar issue and if it has been fixed?

Thanks

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  • fixmynad May 14, 2008

    Thanks! i'll try to get to it in the weekend.

  • fixmynad May 18, 2008

    Hi,

    I took a quick look, and found 2 resistors that while seem to be intact, both have the painted cover burned off so that the color bands are no longer visible. I cannot tell if there's anything else that may have been damaged or if the resistors themselves are actually damaged.

    The location of these resistors R811 and R812 are just north of the big round toroidal coil when looking from the back side of the unit. Perhaps that matches the sector of the board responsible for digital input? :)

    Thanks!





  • bmitchener Apr 14, 2009

    I have an NAD T762 as well and about a year ago it started having the same problem where the digital channels go out intermittently.  Analog audio works fine but anything connected to a digital input, whether optical or coax, won't play at times.  Often it will work perfect for days or even weeks then suddenly no sound.  I have been living with it for over a year now because of the time and potential cost to get it fixed.  If anyone has a solution I would be very grateful!


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Since the problem appears only after the unit has been run for a while, I'd be looking for any part close to a heat source. The odd behavior suggests that there is noise on the data lines for the volume control chip and the digital processing areas. Look for a bad 5V regulator +/or bad caps on the 5V line. Also check for poor solder connections in the power supply and final output stages.
Keep us posted.
Dan

Posted on May 13, 2008

  • ABRsvcs May 14, 2008

    I forgot to add in the original note a request for the serial number. NAD is known for making circuit changes within a model series. These are tracked by serial number. Please post that as well. I have requested a copy of the service manual for your model from my local NAD source.

    Keep me posted.

    Dan

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