This case is usually attributable to irregular series resistance welding of CLK, CI, and BO within the entrance and rear of the X chip, so just focus on checking these 6 resistors. You will find a tiny probability that it is caused by abnormal welding of the next pins https://antminer-s19-pro-hashboar21974.bleepblogs.com/31999896/antminer-s19-hashboard-repair-fundamentals-explained