While market breadth is rebounding at the start of Thursday's trading day, Charles Schwab's Joe Mazzola says he needs to see more strength to become confident in the uptrend. Stocks across sectors are about to see their next test as well with the upcoming earnings season. Joe explains how earnings must validate the recent rally in the S&P 500 (SPX) and Nasdaq-100 (NDX) beyond tech. He also addresses TSMC (TSM) and its monthly revenue and the lack of reaction to the earnings surge through the stock.