Problem with audio system 2.1

[Laur]

Hello, i have a problem with a audio system 2.1, Sole S350 , it's not a popular brand and i don't found the schematic online.

The system stop working when i listened music, few years ago, and since then i let it in the garage, but now i want to see if i can repair it.

First them before the system stop working, i gived to someone who claim to knows how to repair so... he removed 2 stabilization transistors and gived to me, but i lost them, and now i don't know what type are...

So i will put the pictures here with the system.

The pictures with the main board: http://postimg.org/gallery/12fyekway/
And here are the pictures with the mini-board who is connected with a cable to the main board, you can see there are no more that transistors at Q6 and Q8: http://postimg.org/gallery/n1esrtj6/
And here it's the picture with a wanna-be schematic, someone who had experience in electronic maked this for me, and he thinks the alternatives for the missing transistors are BD138 or BD139  but it's not sure what type NPN or PNP: http://postimg.org/image/snxbza6uz/

My question is, if i put BD138 NPN and on the board the missing transistors was PNP, i can damage all the PCB?


Please reply if you have any ideas, thank you very much.