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11-18-2012, 09:11 PM
Major Major is offline
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Hi Forum. Connecting foxtel to a vivo lcd has the tvs screen go black evey so often. We put the Foxtel through a vcrs a/v input and output to the lcd tv for more gain but still the screen goes blank but less often. Would a one stage video amp do the trick such as the bc548 and what value r and cs od we need? Regards Major
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  #2  
12-06-2012, 11:59 PM
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Hi, Major.

Though you may have already solved this issue on your own, I wanted to follow up with you anyway.

I'll assume that "Foxtel" is cable TV provider. And your issue is fairly common -- not just with Foxtel, but quite a few cable providers. It's likely due to the cable boxes (receivers), though the cable companies love to falsely blame the HDTVs as the culprit. A friend reported an identical issue with his cable provider last month, as well! My best guess is that the box is not outputting a 100% complaint NTSC or PAL video signal, which the TV has a hard time locking on to. That's common with out-of-spec devices and digital era video hardware. For example, video capture cards sometimes have a heck of a time locking onto the "blue screen" menus from VCRs. Same issue with older 70s-80s video game consoles, too.

An amp may do the trick simply because it's more likely to output a compliant video stream better than the cheap cable/satellite receivers. However, the tradeoff is that some amps will strip out parts of the in coming signal deemed to be "not video", including on-screen guides, closed captions, etc. In the worst cases, you'll get a blank screen again.

This is one of those frustrating issues that requires testing with hardware. Be sure whatever you buy can be returned, should it not fixed your issue.


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12-07-2012, 07:54 PM
Major Major is offline
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Hi admin and thank you for the update. Its interesting to know that an amplifier may stop non video signals and a black screen is outputed. I have actually had arguments from people asking, why would a company sell a device that is not going to drive a tv, that doesn't make swear swear sense? I say to them, read this forum, the problem is quite common. I will construct a one stage transitor amp and try it out. I thought a vcrs av in out would fix the prob. m
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  #4  
01-30-2013, 02:41 AM
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Let us know how the one stage transistor amp works out for you.

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