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Picture tubes are available at electronic spare part shops. You have to give them the number and type of the picture tube, to which your JVC TV has. Picture tube, along with its Yoke fittings are integrated, and you can replace it by yoursef at home. Be very carfull in handling the picture tube, as they are highly vacumed, and will explde by hard hits. There will be four seating screws on the four corners of the picture tube, and these slots will clearly alaign if the picture tube selected is orginal number. Diamentions of these holes will be different to spherical and flat picture tubes. So you must first aware of the type of picture tube, which the TV has fitted earlier. OK.
vertical output ic needs to be resoldered. careful leaving that bright line displayed on the screen as this will cause a permanent phosphor burn into the tube. this can not be corrected once burned unless you replace the tube. mch
I have the JVC AV-27020 and had to download the manual just today. I checked where I got my manual and they did not have anything for an ACV-27020. The link for the TV manual I downloaded is below. Maybe it will help.
Before confirm the picture faulty go and the select the blueback option ON in menu option. Disconnect the cable signal and check the tv displays bluescreen. If it is there picture tube will ok, fault in C board. May be dry contact in blue output section the picture tube conducts heavily the respective color.