On 15/06/2021 15:59, VK5EEE wrote:
Thank you Bob and where do I go to read up or what do I do to check if they're faulty, if possible while leaving them on the board?As Bob says replacing those components is required in almost all cases like yours.
Check voltages on the BS170s RX and TX will reveal their operation but if one goes it's best to replace them all especially having used19 volts. Hope nothing else has blown.
73 Alan G4ZFQ
Start with Q4,5,6,7. If one of the 170 blew, it likely took out Q6. They do not have to look bad to be bad.