Panasonic video NV-F65EB, test pattern distorted.

[Jørgen Christensen]

Following happens when i watch TV via videotuner (not recording).
When watching the testpattern from Denmark or Sweden the vertical white
lines are zigzagging right and left for every horizontal white line in the
pattern. Zigzagging can be up to 1 centimeter.
It looks like too much antennasignal, but I have tried to lower
antennasignal up to 40 dB/uV (heavy snow) but the problem is still there.
Have scoped voltages to tuner and modulator, no ripple on scope.
When watching ordinary TV (not testpattern) vertical lines are not steady.
What am I missing?

Regards Jørgen.

 

[eddumweer]

Probably bad ESR on electrolytic capacitors in the powersupply. With the
oscilloscope you can't see that.

Greetings PP

 

[Jørgen Christensen]

Thanks, I will check the caps. I have just received an ESR tester from
England today.

Regards Jørgen