33V is used as the tuning voltage, which has supplied to the varactor diodes inside the TV, and not is the supply voltage. The supply voltage is 5V itself, and this is a 5V tuner. The only thing to note is, whether it uses SDA - SCL or Bl -BH. This is the type.
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".
http://electronicshelponline.blogspot.com/
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