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Sounds like T'Con board fault. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
good day, if youre saying that you program the DVD to work on channel 2 or 4 does it mean you convert the signal of your dvd player from A/V output to RF out?
because the simpliest way to connect your DVD player to TV screen is by using RCA cable ( 3 wired cable being color marked as yellow/red/white) yellow = video red and white = audio
the connection would be: from dvd back part you'll see colored socket yello/red and white. connect the RCA to those socket following the same color .
and from the TV screen there should be A/V input socket. can be locate at the BACK/Side or FRONT of the screen marked as "INPUT" ( AV1, AV2,AV3 if multiple inputs). Then select which input you want to place your DVD player ex.AV1 (from AV1 there will be 3 scoket in a row, yellow/red/white)
Connect the other end of your RCA cable following the same color code to TV "AV1 INPUT" yellow = yello/red =red/white=white. then from the remote commander of your TV screen locate a button marked as "TV/AV" or "A/V" press this button until the screen display switch to AV1.
Do you have another TV in house that works with this channel correctly? Do you have a VCR (or VCR/DVD combo) that you can use to tune to this channel? I'm wondering if your tuner is going bad on this one channel. Do you have SAP (Second Audio Program) turned on? You may want to turn it on and then check channel for sound. I'm assuming that you're getting your cable feed thru coax and not composite (red & white audio). If you are using composite, try switching the red & white inputs to see if sound comes in. It's possible that cable company is only outputting audio on left or right channel and something is wrong either with one of your TV's speakers or with the cable company's output.
Phillips LCD TV 17PF8946/37, has no picture at all on the screen, even menu and channel #s not showing in the screen. The screen just have blue color. Everything is working like switch & video. Please let me know what parts need to be replaced and where can I order the parts.