W2 High power HF sensor failure

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W2 High power HF sensor failure

iw7dmh
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 Voltage Check Overal inside view
Best 73'
Enzo, iw7dmh
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Re: W2 High power HF sensor failure

iw7dmh
Just for information,

Domenico IU4FCW, a friend of mine, checked the transducer and found anomalies in the three transistors Q1, Q2 and Q3.
He replaced all the transistors, even if two of  them seemed to be working fine and the transducer started working again.
The previous check on the three diodes had given positive results. After replacing the transistors, the next step would have been to replace the two LMC6482s but it wasn't been necessary.
Maybe this can help someone else
Best 73'
Enzo, iw7dmh