Kim Crawford was charged with murder and manslaughter in Bronx Criminal Court on Tuesday. She was ordered held without bond.
Prosecutors say she admitted hitting the boy hard in the back and stomach over the broken TV.
Police found her son, Jamar Johnson, unconscious and not breathing at their Bronx home on Friday.
An autopsy revealed internal abdominal injuries.
Defense attorney Camille Abate told the Daily News that Crawford shouldn't have been charged with murder. She says the facts do not establish that Crawford tried to kill her child.