TDA7294 100W Audio Amplifier Causing Unexpected Problems
I would suggest ordering a TDA7294 from a reputable supplier like RS Components or Farnellinone and replacing the device in your board. There are a very large number of counterfeit parts coming out of the Far East so although the board and passive components may be OK I would suspect the TDA if it were me. If you remove the device from the board and measure with a multimeter set to read resistance particularly the ground pin to 7,8,13,14,15 any sign of low resistance will suggest an internal short circuit. Also measure most combinations of these pins in the same way.