Hi Florendo,
Check the supply voltage at pin# 2 of TDA7056 IC, if you havn't voltage, trace it, the fusible resistor might be open. Replaced if open then power on the unit. If the fusible resistor burned again, this is an indication that youre IC is shorted(need replacement). If nothing happens to the resistor and the supply voltage is present now in pin#2 your IC need to be replace also because this is already open. For more info click this http://pdf1.alldatasheet.com/datasheet-pdf/view/19422/PHILIPS/TDA7056.html.
Hope I helped you.
Have a nice day!
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