The panel also asked to rehear parts of the 79-year-old comedian's deposition testimony.
Bill Cosby's accusers and supporters alike have gathered on the courthouse steps to await a verdict in his sexual assault case. In tears, Bernard told one man what Cosby did to her, then approached a line of people carrying signs expressing support for Cosby.
As deliberations dragged into a fourth day, some jurors have appeared angry and frustrated. The case has little forensic evidence, and legal experts have said it fits the "he said-she said" dynamic that is common to sexual offense cases.
Bill Cosby's spokesman says a jury's struggle to reach a verdict in the comedian's sexual assault trial shows it has doubts about the accuser's story. His lawyer has said they were lovers sharing a consensual sexual encounter.
Judge Steven O'Neill urged them to continue on Friday but did not set a timeframe for their further deliberations. He says Cosby was cute and clever with the children and talked to them in Italian.
With various civil trials against Cosby planned or underway, a battle for hearts and minds has been fought outside court.
Cosby denies the allegations; he declined to testify in his own defense at trial.
Constand's lawyer, Dolores Troiani, says only that the jury is "apparently working very hard" to reach agreement on the charges. After 31 hours of deliberations, jurors said they were deadlocked. In his decade-old depositions, Cosby said he gave Constand Benadryl - calling the pills her "friends" without telling her what they were - and admitted to giving other young women Quaaludes, a sedative, in the 1970s. They were bused in from Allegheny County near Pittsburgh and have been sequestered for the trial.
The 12-member jury must come to a unanimous decision to convict or acquit. "They have really taken their time to redo and retry the case in their deliberation room".
Constand worked for Temple University in Philadelphia, and Cosby is a Temple graduate with a home in the area. They ordered strombolis for dinner while a court reporter raced to transcribe that portion of last week's testimony.
"We can not come to a unanimous consensus on any of the counts", a note to Montgomery County Judge Steve O'Neill reads. They were expected to return for Day 5 on Friday morning.
He faces a maximum of 10 years in prison.
The jury consists of seven men and five women, including two jurors who are African-American. According to an affidavit, Constand has accused Cosby of drugging her with three blue pills and then making physical contact without her consent including forcing his hands into her pants and coercing her into touching his erect penis in 2004.