Composite to component video adapters

That flimsy SCART was originally a protectionistic move in France (Peritel) in order to slow down the Far-East Asia competition.

One should remember that all tube televisions (and even early fully transistorized) TVs in Europe were AC/DC devices (half wave rectifier to generate about +200 Vdc) and the chassis could be connected directly to 220 V phase, depending which way the mains plug was inserted into the mains socket.

Making safe external interface ports was very hard. The antenna connector was easy, due to the high frequency (small transformers or

3750 Vdc rated capacitors). Anyway, since tube audio output needed an output transformer, an external speaker output was easy to arrange.

However, connecting the broadband DC - 5 MHz baseband video is quite hard, while maintaining sufficient isolation barriers. In practice, you would need a few 4N25 optoisolators (some in a feedback configuration) to get DC to 5 MHz base band bandwidth. Those were expensive components a few decades ago and hard to justify in a mass market product.

Be worth looking for the ROW manual for the same unit and on hacker websites to see if there is a known engineering escape code to tweak its capabilities. Ruins the warrantee but may give you what you want.

Or RF modulate the composite video and allow a boring cheap analogue decoder turn it back into a YUV video stream. Quality will suffer. (may still be the cheapest off the shelf option)

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Martin Brown

I think I also mentioned before that I am already using the TV's coax connector in order to be able to bypass the cable box and thus being able to use the TV's on remote ctl for those channels that don't need the box. I wanted to use the A/V path between the box and TV for channels that I can only receive through the box. Unfortunately that only gives me the monochrome display right now.

The TV remote is able to switch conveniently among different signal sources.

Giving them a disconcerting ability to catch fire even when turned off. I'm amazed the regulators permitted it for so long.

Sylvia.

While a tube TV full of dust could catch fire when on, I have never heard of tube TVs catching fire when off. After all, there was a mechanical two pole switch at power input.

The problem started with various quick start systems as well as the use of IR remote controls, which forced to keep parts of the power supply active for 24/7. Some mains filter capacitors were known to catch fire after a few years. These hazardous capacitors were routinely replaced, when servicing a TV for some other reason.

That latter point seems supported by the research I've done since. Another treasured belief bites the dust.

Sylvia.

I have serious doubts that there was that much integrity in TV repair jocks to be able to apply the moniker "routinely" to that service "add-on".

A few techs did such things. Most didn't.

Composite to Y connection produces a monochrome display. Composite to either of the other two component inputs produces a "No signal" warning message. I could not find anything in the TV's menu that would turn the monochrome display to color. This however might become a moot issue soon because the FCC just gave permission to cable companies to encrypt all channels, even the local ones. This makes clear-QAM TV sets and their own remote controls pretty much useless as all channels can only be received through the cable box and controlled by the cable remote control only. No point in connecting the cable box to the TV via the A/V cables. Just connect the box coax output the TV and set the TV set to channel 3. Some progress, huh?

To make a faithful copy you need a digital connection like HDMI or DVI

I dont think SCART carries any signals that aren't prsent on VGA or S-video connectors. Blu-ray and hd-dvd players use encryption on the digital connection to stop copying.

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The techs who (all too frequently) repaired my rented Philips Colour TV way back when clearly didn't really know how the thing worked. They mostly just searched for dry joints as far as I could tell.

Sylvia.

It's odd that the cable box would only have two types of output. What make and model of cable box is that?

Have you asked your cable company tech guys if they have other types of cable box in their fleet? Most cable companies are stuck supporting an installed base of several types of boxes.

On a sunny day (Mon, 29 Oct 2012 18:30:12 +1100) it happened Sylvia Else wrote in :

Not 'all', at least the first color tube sets had a full wave rectifier and the chassis was ALWAYS live if it was plugged in. That was the time sets had no video input.

When AV input and SCART became common manufacturers were forced to provide mains insulation. Not immediately, the VRC connection for my first Philips color TV came as a box, it had an RF (30+MHz) modulator, had to be installed by a 'qualified technician', and fed into the IF chain. had RF insulation.... I am sure there are many more exceptions to the 'always' case. Huge transformers were expensive, but once they started using switch mode supplies the insulation was simple.

2 pole main switch was required for all sets in Europe. And I think they want it back on all electronic equipment, and accessible from the front, so people actually switch things off, green.

the chassis was ALWAYS live

mains insulation.

'qualified technician',

supplies the insulation was simple.

the front,

Early US color sets were all transformer powered.

Do you have a S-video input?

There are type-F A/B switches, you know? ...Jim Thompson

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| James E.Thompson, CTO                            |    mens     | 
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I love to cook with wine.     Sometimes I even put it in the food.

Some even have keys to lock out the parents. ;-)

Guess what? I don't know what type-F A/B switches are, but I actually installed an old fashioned manual A/B switch that I only use after I checked an encrypted channel in monochrome mode first using the TV's remote and then use the A/B switch to get the full color when the program looks promising.

The free set top boxes only have composite and coax outputs. They charge a monthly $10 rental and some initial fee for the others with more output types, such as HDMI. They are typically meant for people with the more expensive HD cable packages. The cable box I have is Motorola DCH70.

I've noticed that there are many cable boxes for sale on ebay and I wonder how that works, considering that one has to register each box with Comcast for the box to work. If Comcast will do that, it might be a viable option for me.

Nope.