Why do you think its bad? Its extremely rare for low voltage, low capacitance disk ceramics to fail unless they have been mechanically damaged.
Even if it is actually bad, it would have to be either in the control circuit of the PSU, or shorting a power rail to ground, tripping the PSU's over-current protection or pulling down a control input of the Syscon (MCU), preventing the power button from being recognised for it to be able to stop the reciver turning on. Do you have the schematic, or can you otherwise trace C156's connections back to an output of the power supply or to the Syscon chip?
If it is failed shorted, and dragging down a rail or MCU input, as its designated for "EMI Suppression" the odds are, if there's no other fault, the receiver will power up with it removed. If its in the PSU, *DON'T* try to power on withoiut it.
*IF* it does need replacement its almost certain any brand or generic 10nF, 35V or higher working voltage disk ceramic capacitor would be suitable.