which components are used in tv circuits?

[tvtech]

Now I have to be careful again:

Probably the most useful things you can strip from a CRT TV....

.Line output Transformer. The thing that feeds the Anode of the Tube...many numbers and varieties. Getting scarcer by the day.
.Jungle IC
.Micro IC (often combined with Jungle lately)
.Line output Transistor (if not blown)
.Chopper Transistor (if not blown)
.Maybe one or two Input Chokes (they burn out when "Scientists" here decide a nice thick piece of wire is the same as a Fuse)
.The Tuner (scarce) and there are many varieties....of course given the time one can make one work in another's place...

And then the Tube if it is good as well......

Hell, you may as well save the Cabinet too...And don't strip anything in the first place

In fact we dump stuff here regularly. Toss and throw away. No space for rubbish anymore.
All goes to the Tips...

Except of course Line Transformers....no set ever gets dumped without that being removed.

Regards,
tvtech

 

[throbscottle]

TV, wtf is a "jungle IC" ????

 

[4pyros]

Most of the electrolytic's may be dried up in an old TV.

 

[fezder]

.Jungle IC

is, what exactly? sounds complex

 

[4pyros]

Mostly used in Sony Trinitron TVs.
Its got a bunch of stuff in it.

 

[fezder]

aaah, those beasts, now i get it, seen couple similar

 

[Nigel Goodwin]

Mostly used in Sony Trinitron TVs.

Not at all, 'jungle' is a common name for a similar chip used in most 'modern' CRT sets - Philips Components ones are far more common than Sony ones though, I seem to recall NEC ones as well?.

However, I would completely disagree with TVTech's suggestion they are 'useful', along with the micro they are completely useless for anything else other than their intended purpose, far too specialised to be useful.

 

[throbscottle]

That's interesting - I thought it was a slang term! Never heard of a "jungle signal" though.

 

[tvtech]

However, I would completely disagree with TVTech's suggestion they are 'useful', along with the micro they are completely useless for anything else other than their intended purpose, far too specialised to be useful.

Unless of course you are in the CRT TV game

 

[ronsimpson]

TV, wtf is a "jungle IC" ????

The first step in making TVs and monitors do more with less parts involved 'hybrids'. This is where we took 30 to 100 pars, surface mount, and put then on a PCB or ceramic board. This really helped manufacturing.
**broken link removed**
The first jungle ICs I work on were 'analog'. The jungle IC will include most all the small transistors, resistors and some capacitors. These were small pin count usually below 40 pins. Most had both horizontal PLL and vertical oscillator. I designed one for Samsung that input many different typed of video and output one format. It looked for separate sync/composite sync on H&V or H. It also looked for sync on green if no digital sync was there. It also output 'blanking', 'black level', and 'color burst' timing. It was a multi format video processor for TV and VGA sets.

The early digital jungle parts from Europe had a 8051 CPU + ADC + DAC and much of the analog jungle parts. I was thinking of Philips and SG. These parts has analog DACs.
The first Samson and Sony parts had a 68HC11 CPU. The Sony's were later converted to a different CPU. These parts had PWM (digital) DACs. I managed to include (digital) ADCs that measured beam current and room brightness. We converted most analog functions to digital. By the end, some sets had a vertical power amplifier in class C (PWM).

Why: To make repair harder. lol NO. (the repair department inside the factory mostly went away)
Every year we added more functions, reduced price, reduced parts, helped failure rates, reduced factory labor greatly. The goal is to reduce the price to where there is no reason to repair. sorry---TVTech

 

[tvtech]

You are most Welcome Ron

Thanks for sharing a bit of History

Regards,
tvtech

 

[dr pepper]

I have a few, well probably 100's of salvaged bits off tv boards and I have to say 'house codes', or special part numbers are rare, I think I've only seen a couple in around 20 sets.
The only dried out elco's I've come across have either been bulged or blown to bits.
Dead hot's on the othe rhand are common to the point where I test before putting in the tranny drawer.
All that said the trickle of dead crt telly's has now dried up.
My local dump no longer accepts crt tubes, the city one still does, I thought they still recycled them.

 

[Nigel Goodwin]

I have a few, well probably 100's of salvaged bits off tv boards and I have to say 'house codes', or special part numbers are rare, I think I've only seen a couple in around 20 sets.

Thorn commonly used in-house transistor numbers

Such as the 3000 series.

 

[tvtech]

My local dump no longer accepts crt tubes, the city one still does, I thought they still recycled them.

Hi Dr

Here where I live CRT tubes are considered as "contaminated glass". Worth nothing more than landfill in a dump site.
So, as heavy as hell, but not recyclable. Wasted glass.

Regards,
tvtech

 

[tvtech]

This is a good Thread

We can all learn here.

Regards,
tvtech

 

[ronsimpson]

Back when I started in electronics and TVs had large round objects that glowed warmly, resistors were wired "point to point" with out PCBs, (I used nail clippers to cut out the carbon comp resistors). I could only built things if the parts came from TV or radios. You can built a HAM transmitter out of TV parts.

At work I told everyone I would retire when my eyes got so bad I could not see the color code on resistors. Resistors I use today don't have colors. So I can't retire.

 

[tvtech]

Hi Ron

Certain Samsung sets we see here still use an SMR40000. It's control IC is a thick film little green baby that sits right in front of it.

Very reliable sets that have been around for the best of maybe 15 to 20 Years? Tubes never go "flat". LOPTX's don't fail. They have a R2KY protecting the Line when the PSU looses it. And a SMPS always does that sooner or later

A very good design from Samsung...wish there were more of them. Only SMPS blow ups. Ever. Nothing else.

Classy stuff as far as CRT goes.

Regards,
tvtech

 

[tvtech]

Seeing I am here and talking...

My beloved Tedelex/Sansui chassis. I believe designed by TCL. Now there are a bunch of folks that knew what they were doing. They don't do CRT anymore. But they got stuff right.

We have literally many hundreds of 74CM Sansui and Tedelex sets I have saved here. My absolute favorite set to work on if nobody has fiddled before.

Outstanding Chassis...easy to work on... tubes are driven gently...reliable as one can make a SMPS PSU.
To this day....and these sets have been around 10 to 15 Years...Never replaced a Tube.

PSU problems and blow ups yes....like any damn SMPS...rest from what I can see will last these lucky Customers probably another 10 Years at least...

And the weirdest thing...never had a Cockroach climb out of one of these 74CM sets ever. People tend to take care of them.

I did not tell them to do it. Folks that could afford a set that size years ago appreciate the value and money spent.

Those are the ones I have time for and go out of my way to help...not the rest that dump their rubbish here and expect me to fix things they have taken to the tool (for want of a better word) down the road....

Regards,
tvtech

 

[dr pepper]

There are or used to be recycling centres that processed tubes for the glass, metal and phosphor, dont know of they are still going.

I have a small collection of old radios and a couple of telly's that have the mentioned glass glowing thingies.

Unfortunately I no longer directly work in the field of electronics, I'd have to retire to do that.