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Message: <blockquote data-quote="reginald" data-source="post: 401195" data-attributes="member: 188186">Hi LlewThe receiver would start up alright for about a minute then the psu would reset and then start to cycle at 2 second intervals. The 8V line was suppyling 18V which was causing the 5v reg on the main board to overheat. As only the 5V is regulated which feeds back to the primary then I guessed that must be to do with that. After studying your excellent schematic I opted for C16 the 5v smoothing capacitor. Swapped this and voltages have gone back to normal. I think that it was causing a ripple ie 5V then 0V then back and the primary side was boosting as the 5V dropped to zero volts down the half wave. I think I will swap a few more while I am it some look very tired. I think the overvoltage might have stressed them. R17 as cooked due to the 60V it had across it. Many thanks for a great schematic.</blockquote>