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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Can't see anything obvious at first glance, may need more pics.
Follow the wires from the transformer and also look at the white text on the silkscreen... Resistors are designated "R1", "R2" etc. Capacitors are designated "C1", "C2" etc. Switches are designated "SW1", "SW2" etc. IC's are designated "U1", "U2" etc. Transistors are designated "Q1", "Q2" etc........
Let me go into a little detail that might help. These pictures are of an Ion Audio IPA17 portable speaker circuit board. The speaker will power up and play when plugged into the wall but will not play on battery power. I bought this off ebay as not working for parts only. When I was taking the unit apart I dropped a small screw driver on the circuit board and now the battery won't power up. I've tested the battery and it is charged up. I'm guessing the fuse blew somewhere since there was a small spark when it happened.
The ferrite bead is used to reduce RF emissions and prevent oscillations. They never go bad. There does not seem to be a fuse on the PCBs......what makes you think there is one? Many times the fuse will be in the AC connector on the chassis (the place where the AC cord plugs in).
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