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A flyback transformer is one of the more expensive components in a projection TV. If there is no clear reason, such as a known power surge, you could well replace the flyback transformer again soon because the root problem was elsewhere.
An OEM transformer is not necessary but you might have trouble convincing an authorized factory service technician to use anything but the original manufacturer's parts.
As with many of today's electronic devices, if it is more than a year or two old, you will find the new products cheaper and with more features.
The next generation of projection TVs will use lasers and scanning will be done with optically controlled micro-mirrors - no flyback transformer required.
This transformer does not come with the HV lead, you will need to use the one that is there on the old FBT. Unplug the TV for about 30 minutes to allow it to drain any voltage that might still be in the capacitors. Remember SAFETY comes first.
The picture tube can hold a charge.with a jumper connect one end to the ground wire around the picture tub. attach the other end to a screw driver and push it under the red cap on the picture tub. that will discharge it.. Remove the transformer from the board by disordering all connections. Insert the new fly and solder. from the old transformer follow the two leads on the side to the screen board at the picture tube. one at a time connect the new transformer leads to the socket and board. part number for the FBT 259296 $50.39 from www.theparts store
My thoughts would be, was it a Sony OEM transformer or a generic type? If the latter, that is probably a likely suspect. Another thing would be misplaced wires or switches that could have been accidently moved while replacing the transformer. I have had some of these sets that had no high voltage, and all it turned out to be was a broken solder connection on one of the pins going to the flyback transformer. Usually, if the flyback is bad, the Horizontal output transistor would be also defective. It's also possible that in the process of removing the old flyback (fun job wasn't it?) you may have cracked one or more of the circuit traces in that area of the PC board.