In Jainism there is no exact amount of paap (sin) that is “washed away” by not watching TV. Karma is binding based on our actions, thoughts, and desires, and there isn’t a fixed numeric measure for how much karma is shed by a single choice.

What matters is the intention and the overall practice:

• Reducing sensory indulgence (like watching TV) can lessen attachment and karmic influx, especially if it leads to more mindful living, truthful speech, non-violence, and self-control.
• Genuine purification comes through sustained ethical discipline (yāna), regular confession/remorse (prāyaścitta if appropriate), meditation, and adherence to ahimā (non-violence), satya (truth), and brahmacārya (celibacy) or at least restraint where applicable.
• Karma is shed gradually, not in a single act. Consistent virtuous conduct over time reduces new karmic influx and helps burn existing karma through disciplined practice.

If you want, I can outline how different Jain paths (Śvetāmbara and Digambara perspectives) view self-control, or suggest a simple daily routine to reduce karmic bondage.