Grundig CUC1822 no sound...

[pletik]

Grundig CUC1822 M63-115/9 IDTV 100Hz no sound, picture OK. Sound appears if volume is max. While volume increases week knocking hears in loudspeaker. Disconected mains switch's start switch and headphones jack, but no change.

[jts1957]

Are you saying that Unit uses 100 hz power source OR you're inputting a 100 hz signal and have no sound until volume at MAX?

[pletik]

TV is 100hz. It"s vertical frequency is 100Hz. Has PIP. multipicture, freeze picture..

[torbjorn]

In Europe, it is common that more recent high-end CRT TVs use digital signal processing to double the vertical frequency to 100 Hz to decrease flicker in the picture. I don't think that technology is widely spread in 60 Hz countries, as a 60 Hz vertical frequency is in itself enough to avoid the worst flickering.
Hence why this tv is billed as "100 Hz".

But, back to the issue: Is the sound weak or missing regardless of if you are receiving a RF signal via the antenna connector or if you use the SCART input(s)?

[pletik]

I told that TV is 100Hz because it's here common way to describe digital signal processing TV sets. Even our customers call their tv's that way. I'm sorry if we understood. Sound problem looks the same, I think, on almost all Grundig TV sets analog or digital signal processing. In most cases it occours when start taster on mains switch stay connected ( sometimes high resistance, but still connected) or when loudspeaker's jack is broken. No meter does signal comes from scart or areal input problem looks the same. On normal volume there ins no sound. While you keep pressed "volume up" you can hear ticking sound in the loudspeakers. When volume is on max. position you can hear disorted sound. Think that the problem is in feature box. Customer decided to don't repair it because 35 euro is too expensive for him. Thank's for your time anyway. And sorry if my english is not perfect.