Quote:
Even if the power supply filter capacitor on the TDA1170's power input supply had failed unlikely it would stop the IC from working completely
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Not on this chassis! The original capacitors made by ROE were disastrously unreliable and routinely failed dead short and grounded the flyback supply. Any monitor coming into the workshop, for whatever reason, with the orange ROE cap still fitted, would have it changed as otherwise it would soon be back with no frame scan.
The OP mentions his capacitor had also failed - I would have been pretty surprised if he had said it was OK! I expect R235 is O/C.