What are the causes of this situation (image inside)?

What are the causes of this situation (image inside)?

Postby batareika » Wed Oct 09, 2019 7:27 am

Good health to all!
When checking the voltage at the test points (see table), it turned out that the alternating voltage was 2 times higher than normal (resistors R13, R 14, R 15 are normal).
What can cause this phenomenon, is it dangerous to start the oscilloscope?
Thank.

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