Your original capacitor is very likely bad. I had the exact same problem on one of my TVs and I repaired it by replacing the capacitor. Your new capacitor(s) must have the same or higher voltage rating (i.e. 25V or higher) but should have the same capacitance (\$1500\mu\$F).
You can achieve a \$1500\mu\$F capacitance with one \$1000\mu\$F capacitor in parallel with a pair of \$1000\mu\$F capacitors in series -- the series capacitors have an equivalent \$500\mu\$F capacitance, and the parallel combination of that \$500\mu\$F and \$1000\mu\$F capacitance adds to \$1500\mu\$F.
simulate this circuit – Schematic created using CircuitLab
It would probably be easiest to just buy a \$1500\mu\$F capacitor rated for \$\geq 25\$V, though, since the PCB will only have space for the one original capacitor. They are pretty cheap on Amazon.