Shinybow SB3790 Amp.

[BigBen]

Component TV Splitter/Amp

Any one know any Tech info, a friend is having problems when 3 are used, ie looped, OK with 2 but when 3 are used ghosting and interference, colour bands on the moden LCD TV's

TV's are connected via 5/7m Component cables, also upto 15m cables are used to loop the Amps..

All using separate switch mode PSU as supplied

When in the workshop with one TV and 3 devices looped OK.

This is a Shop installation.

Chap has only done RF stuff before.

Product info http://www.audiovisualdevices.com.au/viewprod.php?catid=&productid=SB3790


Thanks.

[richms]

Component TV Splitter/Amp

Any one know any Tech info, a friend is having problems when 3 are used, ie looped, OK with 2 but when 3 are used ghosting and interference, colour bands on the moden LCD TV's

TV's are connected via 5/7m Component cables, also upto 15m cables are used to loop the Amps..

All using separate switch mode PSU as supplied

When in the workshop with one TV and 3 devices looped OK.

This is a Shop installation.

Chap has only done RF stuff before.

Product info http://www.audiovisualdevices.com.au/viewprod.php?catid=&productid=SB3790


Thanks.

Groundloop would be my guess, had same issue with coloured lines across it when I was running component thru the house here.

Since in the shop you are running everything on the same outlets and have different powersupplies in the gear then you dont see the problem. In the shop unplug all 3 cables and then measure the voltage between the shield of the cable and the chassis of the amp, bet there is several 10's of volts of leakage from the powersupplies in the tv's etc .

[kiwisteve]

If you can locate an old traditional mains 230 / 230 volt isolating transformer , try plugging the offending set into that . In the commercial world of video this is often done . Make sure the VA rating of the transformer is big enough .

[BigBen]

Thanks

Problem is its a shop with upto 24 TV's.

[kiwisteve]

You might have to consider doing it with multiple HDMI connections .

As long as its not via rf from crappy modulators . Looks disgusting ,
you only have to go into one of the nationwide chain stores have have a
look at some of the images !!

[richms]

Try isolating the source and the first amp, and then run from that to the other 2 amps rather then chaining them. If problems persist then you will have to look into some balanced connection between the amps, I dont know if normal cctv baluns would be suitable for HD res, but that would be my first suggestion is baluns and cat-5 - before working up to more expensive distribution options.