HDTV jitter on some channels

geebee27 · **27th December 2007, 11:48 PM**

Hi 'all,

Got a weird problem with HD channels on a Toshiba Qosmio G30 running an Nvidia 7600 ( had it for almost two years...).

All SD channels are fine. Of the five HD channels in my area, three are ok and two have always had what would be some kind of video and audio jitter. I assumed this was just a function of my reception ( antenna signal levels ) and did all my viewing on SD. ( the Qosmio software doesn't have any means of displaying signal levels )

However recently whilst setting up a Mythtv box, I found all SD and HD channels have perfect reception and good sig levels so it looks like signal levels seem to be reasonable after all.

Back to the Qosmio, and I had one of the jittery stations tuned ( eg, ABC-HD ) and minimised MCE so I could research the problem in this forum. B*&^&er me if ABC-HD is displaying perfectly whilst in a minimised window. Maximise the MCE window to fullscreen and still working perfectly.

When checking other HD channels a couple of the previously stable HD channels are now jittery. Ok, so I picked one, minimised, then maximised the MCE window and back to perfect reception. Tune back to ABC-HD and it's jittery again.... Looks like if I tune to a jittery HD chan all I have to do is minimise / maximise the MCE window and 'hey presto'......!

I'm guessing this has to be a setting / codec issue......but wouldn't have a clue where to start. The Qosmio is running MCE 2005.

Apologies in advance; I'm a newb to posting on forums and I'm guessin' this may be overly long.......

If anyone could help I'd really appreciate any ideas or suggestions.

Thanks for reading my post...

pault63 · **14th January 2008, 04:45 PM**

Hi, if the problem stops when you unload then reload MC then you have a lack-of RAM problem. Check the RAM on your video card. If it's 128 MB then you need a new card. Good luck.

geebee27 · **15th January 2008, 07:26 PM**

Thanks Pault63, I'll give it a shot and see what happens.

The machine is running a Geforce Go 7600 and I think it's got 256M of memory.

THe machine itself has 1G.

I did download the trial version of Nvidia's PureVideo which made a significant difference. However it still jerks a little.

I contacted Toshiba suppport to get their opinion; the seem to think I may have a tuner card fault. Not sure about that......

Thanks again for your advice.