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TMDSEMU560V2STM-U: TMDSEMU560V2STM-U

Part Number: TMDSEMU560V2STM-U

About  TMDSEMU560V2STM-U:  A total of 6pcs of this product was ordered on June 28 , but when I went to use them after receiving the goods, I found that 4pcs products can be used directly, and 2pcs products can not be used normally without any reaction. Please confirm that the 2pcs product is a factory quality problem, or can you give technical instructions to see if them can be used normally? thank you.   ( The four order No. T01518740 /T01517658 /T01729377 /T01752589  are OK;      But  The two order No  T01517671 and T01518737  are  faulty.)