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im wondering why you did not connect it to the tv ?? but instead to cable box , does it have a pass thru capability ?? does it need to be off to pass thru ?? as most dvd player don't have a rf output but instead use a hdmi or composite signal output , would it not be easier to connect one of these to a spare input on tv then when u want to use dvd you only need to select the proper input from tvs source button to view the dvd ??
if your question is that if cable or sat converter goes off for any reason , will your tv display a black screen , then the answer is yes , without an input most all tv sets will display the opposite of full white , this being full black , also any on screen displays might not work as well (no video to sync too)
when water shorts out something it overloads a lot of other components so the best advice is to take it in for a proper diagnosis.
you just replace a board but another board is damaged it might just blow the board you replaced and that would prove nothing
If audio is OK, the fault is with its backlight section. If audio too is absent, the fault is with its digital main board. If you wish to get more details visit the site linked here. Pull up older posts.
If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts
back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
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!