It's like the amp below:
http://www.bcae1.com/temp/bp1200p1_sm.pdf
On the diagram, U106 (the other large IC on that board) drives U015, Q101 and then U108 which is the IC you have with a triangle waveform. Confirm that all power supply pins have the correct voltage.
http://www.bcae1.com/temp/bp1200p1_sm.pdf
On the diagram, U106 (the other large IC on that board) drives U015, Q101 and then U108 which is the IC you have with a triangle waveform. Confirm that all power supply pins have the correct voltage.