Resposta para "Samsung TV not starting EU55F6500"a voltage reading from a pin[test point] in a power supply board that is lower than the marked value usually indicates a bad capacitor. this capacitor is connected between the pin and common ground[-],usually electrolytic. try replacing this capacitor with the same capacitance and voltage ratings.
Resposta para "Always shows error of paper jam"cat pee is acidic. this must have caused some parts in the board to corrode and shorted out
Resposta para "Why does my amp not produce a sound from the instrument's signal?"you could try checking for bad opamp/buffer chips near the input jacks.
Resposta para "When I power on my pc, the light comes on for a second, then goes out."replace the power supply unit. this should be an easy job because the psu uses plugs that are simply inserted in and out.the plugs and sockets are also clearly marked corresponding to each other.replacement psu are quiet inexpensive and easy to obtain .