7.5 amps should be fine. The voltage number is unusual. If you have a multi-meter, measure the voltage the TV is supposed to receive bofore the fuse.
I would find it strange that your TV is powered by 125VDC and not 120 VAC but the best way is to check with a meter. Also, you can always install a lesser voltage or amperage fuse adn be safe. Your fuse could blow out right away though.
Whats unsafe is installing a fuse with a higher amperage than the TV calls for.
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