JTC B-28 Cardmp3 player amplifier Schematic

[Billcliffens]

I'm trying to troubleshoot a JTC B-28 Cardmp3player amplifier which had a power supply failure. I've replaced the damaged str transistor with a 3wire power module and now it's powering up fine but it has very low and poor quality audio output.
A schematic of this 12vDC/220vAC Power amplifier will be of great help.