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Main power supply regulator board (SMPS board) fault. Check and replace it. If you wish to get more details visit the site linked here. http://electronicshelponline.blogspot.com/
Search the site by type in the brand name of your device in the search box at the top of the home page, to get gathered all the related posts.
Check the remote control for its infrared emission. Check it with fresh batteries. Check it by pressing all the keys. You can detect the presence of infra-red emission from the remote control, using a cell-phone camera. If you wish to get more details about how to check a remote control, please visit this site. One among the posts has details about it. In some cases, the remote control might need to clean. http://remotesearch.blogspot.com/
Search the site by type in this key phrase "how to test a remote control "in the "search box at the top right of the display window of the Homepage" to get the related post quickly. https://youtu.be/wUpnETSm6_k https://www.youtube.com/watch?v=jsSCNCW3IbQ [open and clean] https://www.youtube.com/watch?v=Qp-l1uh-5gE [open and clean]
Go through the setup of the PVR and check the sound settings. It sounds like it's only producing digital audio, that's why it works with HDMI but you want analog, so set the audio to stereo, or try every setting to see what works!
If your converter box only has RF outpit connectors "F" type screw on it looks like this my be more of a monitor then tv.I took a quick look at the manual and didn't see any RF inputs so it appears it doesn't have tuners built in Looks like you'll need a box that has RCA output connectors.or others that will match what the monitor has on it for input types
I have one of these with the same problem. I couldn't find any others with answers but there are people giving answers about the DMR-EX75 showing the same problem due to power supply decoupling capacitor failure.
I just ordered a manual for mine from manualzone.com to try to locate the culprits. - Wish me luck!
Check with this method. Manually turn on your tv.
Then push and hold the code saerch button until the light stays lighted release the button.
Push and release the device button you want to set TV.
Now you got to push and release the ON/OFF button until your device turn off when your device turn off stop and push and release the enter button for storage the code.
Warning: You may push and release the ON/ OFF button for almost 200 times.