What channel or setting(s)must I select to play a DVD from my DVD player onto the TV? It worked before, but I forgot how.(I lost my manual.) (Sony Trinitron KV-27HS420)

It depends on the type and age of your TV. Most older units work on either channel 3 or 4. You may also have a switch on the DVD player that allows you to chose channel 3 or 4.

Most newer units have an "input" selection that allows you to select the signal you want to receive such as, DVD, Video Game, Cable, TV, etc. My newest DVD player only comes with a HDMI cable that goes to my TV and automatically switches when playing.

A lot of options depending upon the model and age of your equipment.

Perhaps your dvd player output is set for channel 3 so you have to select that channel for the dvd player to play on your tv. Some older analog tvs have a separate input for dvd on the back or front. In that case you have to select that setting from the tv menu

Try a different HDMI cable Make sure you are on the correct HDMI input ex, HDMI 1, HDMI 2

THIER IS A VIDIEO OUT NEXT TO THE COMPONTENT GENERALY THIER MAY NOT BE AN AUDIO OUT PUT SINCE THE SOUD COMES FROM THE BUILT IN AMP HOOKING UP TP THIS WILL LET ALL DEVICES BE DISPLAYED ON THE TV ONCE THE PROPER INPUT CHANNEL HAS BEEN SELECTED THEN YOU WILL ONLY HAVE TO SELECT THE AV ON THE SURROUND SOUND SYTM TO SWITHCH IVIDOE AND SOUND FOR EACH DEVICE PLUGGED INTO THE SYTEM

Assuming your DVD player is properly connected to the video and audio inputs of the TV, you should be able to press the "input select" button on the remote and toggle between TV and DVD. A copy of your manual is here: http://www.emersonaudiovideo.com/pdf/manual/CR202EM9.pdf

Sounds like your TV has lost the DVD channel. Turn off TV and make sure the DVD player is connected to TV and is playing a DVD. Now put you TV on and press the SOURCE or AV button on your TV remote until you can see the DVD channel. In older TVs you may need select channel and tune it manually using the TV setup.

I have the same problem with my Emerson VCR. When the ADD button is flashing, just press the menu button to exit the menu. It will add. That's the only thing I know to do. Sometimes it works, sometimes it doesn't.

if your DVD player supports a HDMI cable a single cable is enough for both audio and video channel.

but both your player and TV must support HDMI.

I have the manual. Are you trying to record something live? if so:

1) Turn on both the DVD/VCR and your TV.
2) Switch the input selector on your TV so that the signal from the player appears on the TV screen (this is usually something like 'input 1' or 'line 1' and so forth)
3) On your remote, set TV/DVD-VIDEO to DVD-Video, then press SELECT VIDEO to control the VCR. These buttons are at the upper left hand corner of the remote controller.
4) To record from a cable box, turn it on.
5) make sure the tape is longer than the total recording time.
6) insert a tape into the VCR.
7) press CH +/- on the remote to select the channel or line input video source to record.
8) select the tape speed SP/EP (SP provides better quality, EP provides three times the recording time as SP)
9) Press the record button to start recording. The VCR display will display the message REC.

(FROM MANUAL)
RF Output Channel
1-Set TV to Channel 4
2-Insert a prerecoeded tape into the unit
3-Press Source until VCR light is lit
~ if noise is seen on TV screen, press (VCR/TV) on remote
4-Press play> once
5- After a few seconds, press and hold {Play>} on the unit for 3 seconds
~ The RF output channel will change to channel 4 from 3 and you will see a playback picture
~ When a picture does not appear on the TV screen, repeat step 4
6- Press (STOP) to stop plasyback