These are remarked ICs. At first, everything looks fine but, under the microscope one can clearly see the sanding marks on the IC surface. The deep of the pin 1 marking are also inconsistent, some are shallower than others. The original TNY277 I have here has no hole at all. It can be a Chinese clone that will work and was remarked to looks like the original PI or could be anything else. I will test it later and see how it goes.