PICTURE ON TV

1. Make sure the video cables are properly connected. The cables that connect the DVD player to the TV should be securely plugged into the correct ports on each device. Double-check that the cables are not loose or damaged.
2. Check the input source on your TV. Make sure the TV is set to the correct input source that the DVD player is connected to. For example, if the DVD player is connected to HDMI 1, then the TV should be set to HDMI 1 as well.
3. Check the TV's settings. Some TVs have a "picture in picture" or "picture by picture" feature that may be turned on, preventing the main picture from showing.
4. Check the DVD player's settings. Some DVD players have a setting that controls the aspect ratio of the picture. Make sure this is set correctly for your TV.
5. Check the TV and DVD player compatibility. Some TV's are not compatible with older DVD players and this could be the reason for the lack of picture.

Hi Gill.
Check, Make sure the cables are connected. Try cleaning the laser and the DVD. Make sure the TV is on the correct input.
try swapping one of the sound cables to see if the yellow cables is in fact damaged.
1) Plug the DVD player in to the TV that it does work on. Make sure there is no disc in the player. Check the DVD players set up menu. Look in the Picture menu and change the output to "RGB" Move the player back to the TV/VHS Combi. Select the input that gives you RGB1.

2) Same as above, but this time change the Picture menu to PAL (or composite or Video....whatever is the other option name that isn't RGB or S-Video). Retest on the Combi, but this time you want AV1.


If these don't work then you might need to have a look in the TV manual about connecting external sources. It could be that because the combi has a recorder that it's trying to stop you from copying DVD to VHS. See if there's an input on the combi that bypases the recorder.

Read more: https://www.diynot.com/diy/threads/dvd-problem-sound-but-no-picture.211588/#ixzz5FYrJiX6o
I found all this on the internet so not sure if it will help you out.
or try this link.
dvd player has sound but no picture Google Search

The problem is usually from the power or the Y sustain at the left or right side of the display when one of the large capacitor or heat sync on the capacitor even the flat power cable connection it to a main power board needs to be checked too, if the fuses on the board are blown it will need to be replaced

But after replacingthe fuses and the capacitors and still no solution,youwill need to replace the all board ..

You can also trouble shoot first before going to the board of the TV..

How to Troubleshoot an LCD With Sound But No Picture


It can be overwhelmingly frustrating when an electronic device as expensive as an LCD television set starts having problems. Luckily many of these problems are easily troubleshot. While being able to hear sound coming from your LCD television but seeing no picture may seem serious on the surface, fixing the problem involves checking a few different settings to make sure everything is set properly


Instructions



Check the video connection of any devices plugged into the LCD television. If you can hear sound but are seeing no picture while trying to use something like a DVD player or cable box, the problem is probably that a wire is loose somewhere. Check the yellow video cables running from the DVD player to the TV and make sure everything is plugged in firmly and where it should be. Also check the coaxial cable running from the cable box (or cable outlet) to the television and make sure that wire is also screwed in securely.

Check the image settings on your television and make sure everything is set properly. Certain settings like "Picture" or "Brightness," if set to one extreme, can make the picture appear completely black. This could cause you to simply hear television shows but not be able to see them. Reset all picture settings on the TV to their original factory default settings to see if that fixes the problem.


Try another channel. If you're watching TV and not getting a picture, the first thing you should do is check a variety of random channels to make sure it is a problem with your TV and not with your television signal. If it is a problem with the television signal it is the fault of the TV station or cable service provider and there isn't anything you can do yourself to fix it.


Try the DVD on another DVD player. If you're trying to play a DVD and can't see any images, make sure the disc isn't defective. Try it on another DVD player or a computer DVD drive and make sure the disc works in the first place.

Hope it helped ..

Select AV-1 or some thing in TV and plug DVD recorder Video-Audio output in AV-1 input of TV, playback any DVD and confirm its picture and sound in TV. Press Stop button of DVD recorder to stop playback.
Now plug Video-Audio output of VCR in DVD recorder input and select AV Input in DVD recorder, insert VHS tape in VCR and playback it and confirm you get VHS picture and sound in TV via DVD recorder.
Hookup between TV, DVD recorder and VCR is completed.
Playback VHS tape in VCR, Insert blank DVD disc in DVD recorder and press Record while you see VHS tape picture in TV.
Hope this info will help you.

Look under your tv settings for the pal ntc settings if you are using the av wire, if not please tell my what yoiu are using, also mak sure that youve pluged the av wire in the yello conecter av out on dvd/vhs and @ the tv AV in

Some program have copy protection or your installations cable and setup try to set lower resolutions and make sure you see the picture on TV before record
Or tell me how are your installation from which device to where
I may able to help you
Cheers

It sounds as though the unit is actually recording a DVD, but is getting no incoming signal to record. What is your recording source? Satellite and receiver? Antenna? Cable box? In the set-up menu, be sure you have chosen the proper input source; i.e., recording from where? You may be able to access that menu through the Function button on the remote, AFter setting that menu, be sure to press Return to restore the recorder to the ready mode. If you are using the RF input for recording, be sure that is selected as well, as opposed to L1 or L2. The input channel must match the output channel on your receiver, usually channel 3 or four. What is the model number? 

Check the RCA wire or fiber optic conection. If you use RCA wire be sure you put Video output from your DVD to input Video of your tv set.

Are you using the component (RGB) outputs, and a Sony TV? I believe that there is something in the output of at least some Panny DVD recorders (over the RGB component path), which Sony TVs don't process properly.