troubleshoot practice

[ilyas_te]

hi guys,
I am very happy to be among of you.     Please be my GURU.
Can anybody tell me where i can find some basic circuits for troubleshoot practice? I need them to improve my knowledge in electronics workshops. Thank you very much.

[Paul Price]

In any electronic equipment garbage disposal spot, ask friends and neighbors,  there is a reason it is ready to be thrown into the trashcan.

Notice that there is a Repair section to this forum, plenty there to learn from.

[Derick Freese]

I learned all of my repair skills from garbage bin finds.

[ilyas_te]

I am sorry for my late response

thank you for Mr. Price and Mr. Freese 
However, do you think that they are too complicate for me as beginner?
Can you guys tell me about your experiences when you were trying to troubleshoot a circuit for the first time?
For me, it is very difficult to decide the first area that i need to check when handling the trouble circuit. 

Thank you for helping me.

[IanB]

It will be nearly impossible to troubleshoot a circuit unless you know how it works. You will need prior knowledge of similar circuits, or a schematic, or a repair and troubleshooting guide (or all of these).

In general, you start with the power supply and make sure the right voltages are present in the right places. After that, you follow the signals from input to output and see where things start to look wrong.