I have a Teac AG-10D Digital Reciever. I can get sound from my two front channels only, and only in stereo mode. As soon as I try switching to a surround sound mode, all sound is lost. I can't get

Hello Amjad, question, how does the shutdown, from the remote control, in the equipment itself or cut off the power supply? and if you cut off the power supply, for how long?
Because depending on the time and how it is turned off, you can lose the parameters and settings and go into mode, factory settings
I send you a link to download the Teac AG-10D user manual, there it tells you the adjustment procedures and memorized them
I hope my comment has served you
Greetings Franco Dosil

Hola Amjad, pregunta, como hace el apagado, desde el control remoto, en el propio equipo o corta el suministro de energ?a? y si corta el suministro de energ?a, durante cuanto tiempo lo hace?
Porque dependiendo del tiempo y forma como se apaga, puede perder los par?metros y ajustes y se pone en modo, Ajustes de fabrica
Te env?o un link para que descargues el manual de usuario del Teac AG-10D , ah? te indica los procedimientos de ajustes y memorizado de los mismos
Espero te haya servido mi comentario
Saludos Franco Dosil

https://www.manualslib.com/manual/744985/Teac-Ag-10d.html

http://www.ebay.com/itm/Teac-Tascam-AG-78-AG-75-Receiver-Service-Manual-Original-/222026334729?

There is not much to it. All you will get is a 2 speaker stereo audio. You need to be able to get the stereo audio output from the TV and with 2 RCA cables connect the red and white connections from TV to the TV/ VCR in connectors of the Teac Receiver. But I doubt you will get this output from modern TVs. They usually provide digital or optical output connections. Make sure you have selected TV mode at the front piano key on the receiver.

Find a manual and see if there is a Reset function

You can find support for your Teac amplifier from the link below. please click for the details or make your request to the contact near your location:
http://www.teac.eu/hifi-audio/support/

If you've already swapped them left to right to prove the speaker works bt the channel doesn't then you know the problem is in the electronics. Is it one or more sources? Turn the receiver off and manually operate all the switches and knobs throughtout their ranges (particularly the Tape controls) and see if that helps. No? Take it to someone to look at it.

you can download a manual for $9.99 from User-Manuals.com....I did this today and the manual is identical to the original it seems

These recievers are prime for running surround sound through you TV. It all depends on your TV service, Now if you have a cable box from Dish network, this is the easiest in the world, all you need to look for is an output labeled "OPTICAL OUT". It's a small port with probably a small glowing red light coming out of it. You'll need to buy and optical cable and plug it in there, and then run the other end to the optical input of your surround sound reciever, and then assign a video input to that digital audio signal. It's the best audio you can get by far.

Now if you down't have that, it is still very easy. Find you reciever look for a video input and plug an audio cable in(Red and White cable). Plug the other end into your TV's audio output, a red and white output that is probably labeled audio out, plug that in, switch TV to whatever you are viewing, turn on the reciever to whichever input you assigned and there you go.

If your TV doesn't have an audio output, then you need to go to your cable or sattleite box, and find the audio output, the R/W(Red & white), and run that out to your reciever, the sound won't come through the tv unless you run a second audio out from the reciever into you tv's audio input on the same signal your picture is coming from.

I hope that helps.

I had the same problem. Set the reciever on 6 channel stereo. On this setting, you should be getting the same sound out of each speaker. Isolate which speakers aren't getting sound. Now, on your speaker switch (the A/B button), select A. If that doesn't fix it, select B. If that doesn't fix it, try A and B (if you can on your reciever).

Now, when you switch back to pro-logic, make sure your a/b channel switch is in the position that worked in 6 channel stereo. Yamaha recievers have a memory, and when you switch various modes, it makes auto adjustments based on what you had set in the past.

Hope this helps

Stereo Tech: Check speaker switch(A or B) also be sure you have selected FM, AM, Video, CD ect., somtimes if you do not have a stereo signal the unit will mute best to fist try tape or CD input. Hope I helped good luck.