K8065 (VM156) led problem

Hi.
I have problem. In my K8065 (VM156), on 1kHz freq., LED3 and LED5 lights together (LED3 is brighter). Osciloscope shows rights frequencies at all channels. What can be wrong? I don’t see any shortcut.
Please help.

At 1KHz, it is normal that the 10KHz led is slightly lit, when the batteries are fresh.

Thank You :slight_smile: