Trading in the sets that broadcast what spoils manners and `Aqidah

Q: My brothers and I trade in TVs, internal and external antennas and condensers, but we have never traded in receivers. We have a small amount of wealth, taking into consideration that I (a professor of physics) pay them the monthly rent fees. Then, I became acquainted with your legal opinion concerning TVs. My question now is: What is the ruling of the Wise Law-Giver (Allah) on my money that I earned before being acquainted with your legal opinion? What is the ruling of the Wise Law-Giver on the money that is still in the form of TVs and antennas? (Part No. 11; Page No. 63

A: You must stop trading in prohibited commodities or any form of them. Also, you should stop helping in sin and Batil (false). The one who leaves something for the sake of the Pleasure of Allah, will be compensated by Him with more than what he had. We hope that there is nothing wrong with the money you earned from your previous trade, as you did not know and as Allah (Glorified be He) says: ...whereas Allâh has permitted trading and forbidden Ribâ (usury). So whosoever receives an admonition from his Lord and stops eating Ribâ (usury) shall not be punished for the past; his case is for Allâh (to judge) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.