HP8565A NO frequency Display

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mans9h1gb

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Hi,
I need some help.
I have an HP8565A and I have no Frequency readout neither on the CRT nor on the LED readout.
The problem started a few months ago when the LED readout started to flicker and display intermittent lighting of the segments. Now it just displays 0.0000

I checked the 10V reference and is within tolerance. All voltages on the PSU ar within tolerance too.

Any Ideas were to go from here please.
Thank you in advance
Mans.
 

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