Question about NAD T743 Receiver

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Hello, My NAD T743 has a problem, when i turn it on, then after a couple of minutes the display shuts down, and i cant change the channels or change the volume anymore. i have to shut the power off on the back of the amp and wait 10 minutes before i can change anything. but when the display shuts down the sound stay's perfect! but i cant do anything anymore whit it. i hope someone can help me whit this problem, because it's a great amp whit a terrific sound! :)

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

SOURCE: OVER HEAT

To reset the the T743 hold down the video 6 and the source up buttons for 3 seconds. then power up from the back button

Posted on Sep 13, 2008

  • 1 Answer

SOURCE: Power on T743

Just had my t753 in bits... sounds like its overheating to me. Check that the fans on the bottom still turn and aren't clogged up with dust. Make sure that it has plenty of ventilation.

hmm, also try unplugging everything and leaving it on and see if it still freezes? ie check you're cabling is ok, there are no shorts from bare speaker wires etc...

Could try resetting it too? (in each case hold the buttons for 5 seconds then release)
- Firmware version: hold video 6 and tone control
- Reset DSP: video6 + tone defeat
- Reset completely: video6 + right source button (this will wipe all settings - hold for 5 seconds, release and then unplug from the wall or turn off with the rear power switch)

Posted on Nov 30, 2008

VOTIT
  • 2071 Answers

SOURCE: NAD T773 Shuts Down in 1-5 secs

Your problem is a common symptom of loose connection or cold solder and cleaning problem this is the main caused of no sound or automatic shut off for how many seconds..Cold solder issues - each component is soldered into small holes on the printed circuit board which in turn connects said component to the other components. Due to time, heat, use, some solder joints would be cracked or loose. It is possible that the cold solder is still minimally connected (hanging by a thread). When the receiver turns on heat would be generated which would be sufficient to further loosen up the solder joint to the point it no longer provides electrical contact. Jarring the unit creates movement inside enough to re establish the contact, sometime good enough sometimes not enough. Again, since the unit still operates (sometimes) then it is highly probable that there are no defective components. As you have surmised, it is possibly a loose connection, solder joints are "connections" except that molten soldering lead is used to attach/connect the component to the board, "loose connection" in this sense is equal to "cold solder". Again on the assumption of no defective parts, then seeking a more experienced buddy for the soldering might be to your advantage. This is of course in addition to the possible electrical hazards when repairing.... Good luck: Regards, VOTIT

Posted on Jun 08, 2009

  • 1 Answer

SOURCE: NAD T743: The digital channels stop working after a short time.

I had the same problem just once, about a week and a half ago. Don't tell me that this problem is going to get worse.

Posted on Feb 04, 2010

  • 2 Answers

SOURCE: Nad 743 shuts off at -14db vol. Why?

mine got fixed by replacing the front panel PCB with control processor. Only 350€...

Posted on May 03, 2010

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1 Answer

The amplifier has occasionally shut itself off due to overheating for the last 3 years (I've had it since 2005). But now it continuously shuts itself off and simly won' start up anymore. Does it need a...


They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

A heat sink is just a finned heat-conducting device for radiating heat to the air which should be flowing freely through the unit's ventilation holes. It can't break in normal use. But it CAN get clogged with dust reducing its effectiveness.

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/NAD-T743-Receivers-manual/id/8043bh636/t/2/

Page 6

"Choose a location that is well ventilated (with at least several inches to both sides and behind), and that will provide a clear line of sight, within 25 feet/8 meters, between the receiver's front panel and your primary listening/viewing position-this will ensure reliable infrared remote control communications. The T 743 generates a modest amount of heat, but nothing that should trouble adjacent components. It is perfectly possible to stack the T 743 atop other components, but the reverse usually should be avoided. Nonetheless, it is generally preferable that the T 743 stand alone. It is especially important that sufficient ventilation be provided; if you are contemplating locating the T 743 within a cabinet or other furniture, consult your NAD audio/video specialist for advice on providing adequate airflow."

If you're lucky, you haven't finally toasted it. If you have, a hands on tech will need to sniff sround (literally) to find the dead component(s).

Mar 06, 2011 | NAD T743 Receiver

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My NAD T743 will not switch on. I haven't used for a couple of months and it was working just fine before. Now I tried switching it on using both the power button on the amp itself and the remote, to no...


Hi, have you checked the power button in the back to see if it got pressed by accident? It's a round button located right under the speaker inputs in the back.

Apr 11, 2010 | NAD T743 Receiver

2 Answers

NAD T743: The digital channels stop working after a short time.


Hmm, sounds similar to my problem. Analog input and FM seems to work but all coax/opto input are dead ( for me there isn't a buzz).
Have you, fredrik648, solved your problem?
Anyone with ideas what to do?

Thanks
///Johan Westerlund.

May 11, 2009 | NAD T743 Receiver

1 Answer

Nad 743 shuts off at -14db vol. Why?


mine got fixed by replacing the front panel PCB with control processor. Only 350€...

Feb 28, 2009 | NAD T743 Receiver

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Nad C320 right channel stops working then comes back again


This sounds like the "pre-amp" section is cutting out or there is some interruption in the signal path. A few things to try:

1) With the unit off, try "working" the volume,balance and tone controls. This means, turn them up and down a number of times to clear any debris that may be in the controls themselves.

2) Work the input selector switch the same way if it is a rotary switch.

3) Try turning on/off the tape monitor switch a few times.

4) Keep track of whether this problem is sensitive to heat. Does teh channel shut down more quickly once the unit has been on for a while?

Lastly, if you can solder, look for any solder joint that appears grainy or has rings and resolder it.

Update this with your results and we'll continue on...

Thanks,
Dan

Jan 15, 2009 | NAD C320 2-Channel Amplifier

1 Answer

Using NAD t743 with Panasonic DMP-BD55


The reciever you have has 5.1 inputs at the backof it.The only way to get Dolby True HD and DTS HD is to run the 7.1 analog out from the bd55 to the nad. You'll have to leave the 2 rear surround open on the bd55 leaving the remaining 6 connected to the nad. The digital coax and the optical will not transmit the hd data, only the analog out will. Run a hdmi right to your HD tv for picture bypassing your amp. this will workfine and you'll have the audio you want. You,ll have to change the input settings for dvd in your amp to 5.1 to recieve the audio.

Dec 14, 2008 | NAD T743 Receiver

1 Answer

OVER HEAT


To reset the the T743 hold down the video 6 and the source up buttons for 3 seconds. then power up from the back button

Aug 18, 2008 | NAD T743 Receiver

2 Answers

Turns itself off


NAD Technical Bulletin T743-H2005-06 describes the problem "Unit may shut down, shortly after turn on".  Reason: There is a diode on the standby board that maybe operating intermittently.  Solution: Locate and identify D756 on the standby board.  Change only if the diode is a 1N4148.  Change from a 1N4148 to a 1N4004 or equivalent.  
It is located near a transformer and some fuses.

Aug 07, 2008 | NAD T743 Receiver

1 Answer

LG 42LC7D TV does not want to chg channels after 5 min of use


There are some inductors that are out of spec. LG's original SB said to replace some of these with a jumper, but it only lasted a couple months.

You need to have the Total Main Assy replaced.

Jul 28, 2008 | LG 42LC7D-UB Television

1 Answer

Does not respond to remote control


I have had the T743 for about three years now. The first unit which I got from the local shop was doing exactily like your described after couple of minutes use. Well, I took is back and got a new one covered by the warranty.

Unfortunately I never got any explanation to this problem from my local shop or anywhere else, so I guess the only way is to contact your local shop.

Dec 27, 2007 | NAD T743 Receiver

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