Check the behavior of the ABL line ... On certain televisions when they are without a signal ... The TV shows the blue no signal screen ... but when they receive a signal ... they protect themselves and the abl is activated ... Review the components associated with that line ... I pass on a television that does not use the condenser of approx 22uF / 250V in the line of Abl ... But he used a low voltage capacitor and used a green one of polyester ... I join with some diodes and transistor .. Depending on the side where the finger was placed, the image would turn back ... or get dark ... (of course it was a low voltage line) Comment: If the screen leaks ... Correct that leak ... Some TVs have a sl soldier screen, others have the Screen hooked ... Remove the cover (if it is a soldier) ... Disconnect (if it is hooked) .. If it looks good on the outside .. Then desolde the socket and check inside ... Be very careful when desoldering ... There is a pin to which a central metal ring is connected .. keep that in mind for when you reassemble it .. The capable screen is charred inside ... or full of ollin ... Clean everything well .. Make it look like new .. but .. then change it And check the status of the blue condenser near the screen on the canon card. Currently Jungles are divided into 3 parts ... CPU-OSD (Menus) - Video (Antenna, RCA Video, etc) ... In this case, the VIDEO is interesting ... check the voltages associated with this block Check if you have Video-Out and Video-In. Check if you have an external switching chip (selection) of video 1, video 2 And check all of the above