No Output on AliExpress prebuild after a couple of days in use

[Vobbel]

Hi,

i worked on this Mini-Rig for a couple of days FT8 on and Endfed-Antenna with AT-Tuner in between, then CW with MixW in the Cat-Settings of Kenwood TS-480 with success on nearly all bands without 30m. Sometimes it was necessary to make a factory-Reset. On the third day, suddenly no more output. When i click on the PTT-Button it changes in Display from R to T but no Output. Changing the mode on CW it dispayed "0.00W" Output and the SWR, no output with 12V and not with USB (5V) only ... - all other stuff is working - so what could it be?

[AC9YY]

You likely need to replace the 3 bs170 FETs.