My name is Krit I am a technician of department.
Regarding about BPS C4 all reject fail. We Follow your Suggestion.
1. We format SEP board and test the machine then, we running the machine around 20,000 BN after that it showed all reject.
Then we swap the Back Plan from the other machine to the fail machine and we testing around 20,000 BN. It also showed the same fail.
2. After that we check mechanic and sensor by Component Test mode. We got the DM2 slot 3 Gate Drive Assembly does not work and broken
3. We change the Gate Drive Assembly new one. And then on Tuesday we tested the machine around 30,000 BN. It was ok.
4. On Wednesday we tested the machine all day around 130,000 BN. It was ok.
5. Today, we are testing the machine . The machine can running good.
We need to know about this case is possible from Gate Drive Assembly problem?