W2 High power HF sensor failure

Posted by iw7dmh on Jun 28, 2022; 9:13am
URL: http://elecraft.85.s1.nabble.com/W2-High-power-HF-sensor-failure-tp7670641.html

Hi, after a thunderstorm, my W2 wattmeter stopped to work, maybe after a strong lightining. The control unit is still fine because I testd it with another sensor and it works on both the inputs. I have assumed that the catastrophic event may have affected the silicon components and I did a voltage check on every U1, U2, D1, D2, D3, Q1, Q2 and Q3 pin's. (pls see the attached image) I am wondering if someone can help me to find the defective component so that I can restore the sensor. At first sight the sensor PCB is intact, or at least I can't see signs of any smoke (pls see the second attached image) Thank you in advance for any help Best 73' Enzo, iw7dmh