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Must used a philip screw driver take out all the screws to the dvd player.Must take the DVD player aparts.Take aparts out the dvd player guard shield to the dvd drive to take out the dvd dic or dics out.Don't push the open button any more,the disc or discs is jamming ur dvd door tray.Will burn out ur disc tray motor,if u keep trying push the open button,trying opening it that way.
If the DVD asembly is the same as for model RDR-HX510, the part number is 1-797-247-12 and costs: $358.56 with a refund of $145 upon the return of the defective unit. Pricing was from tritronicsinc.com a Sony parts distributor. (I could not find a listing for the HX520 model)
If you can fix it by yourself, there is a problem in horizontal circuit panel, you need to check that in series because the part appear visbly good but when tested by the exact tester you register busted. that should be replaced immediately. Check also the vertical panel parts of the circuit. but if hard you do the job you may consult the service center of your TV or the vendor of the TV.
ps. please don't rate me if you are not convince of my suggestion.