أنشئ حسابًا أو سجّل الدخول للانضمام إلى مجتمعك المهني.
take a multi meter . put the probes at the ends of resistor. if the multimeter shows infinite resistance that it means that the resistor is burnt out.
It all depends upon your experience. The value of the burnt resistor can be had by precisely observing the circuitry and the function of that resistor.