Use this tag for technical aspects of TV (video formats, for example). Shopping questions are off-topic and repair questions might be too localized.

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5
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2answers
151 views

Why the audio subcarrier is never transmitted with baseband analogue video signal?

In the era of analogue video, when you needed to connect a local video source (STB, VCR, game console, DVD player, etc.), the most ubiquitous way to do so, next to using an RF modulator, would be to ...
0
votes
1answer
98 views

are there 2 basic-type of CRT deflection-yoke coil?

Deflection coil inside TV, deflects the electron-beam, using magnetic field. However this-deflection is not as simple as electrostatic deflection. What is the actual mechanism behind working of ...
0
votes
2answers
85 views

Can I connect two tv antennas in parallel? [closed]

In order to get higher signal level on my pre amplifier to the tv set.
3
votes
1answer
72 views

Why is an HDMI signal causing interference with Over-The-Air digital television? [closed]

I do not have cable or satellite television so I rely on Over-The-Air digital programming (free) and Internet streaming services to provide entertainment. A couple years ago, I purchased a video card ...
5
votes
1answer
368 views

What is the function of “Picture tube charger”?

There is a bizzare device called picture tube charger or CRT-Charger. Here I attach the some diagrams of it from a circuit-book. Now, what is its function? what changes it create inside the CRT? ...
0
votes
1answer
77 views

How dangerous are portable CRT televisions?

I want to use an old portable CRT for a project, but I don't know how dangerous the capacitors are, and if they'd be as bad as the ones inside a normal CRT. It takes in 12v dc via adapter, or 8 D ...
0
votes
2answers
68 views

How to tap out video signal from a computer or a TV [closed]

I am designing a TV transmitter as given in the link below: http://www.electronicshub.org/tv-transmitter-circuit/ My question is, where from do I give the video input? For the audio input, I can ...
0
votes
1answer
53 views

What is the interface that connects the TV LED screen to the PCB

WHile this may be a rather open question, I see that most TV's expose a HDMI port. The HDMI port connects to something that runs linux which in turn connects to the LED screen. What is the interface ...
0
votes
1answer
223 views

Generating Sync Signals [closed]

Normally any sort of video signal received by means of RF,contains a Hsync and Vsync component for instructing the electron beam.My question is ,how does the television do this using external sync ...
1
vote
0answers
71 views

What level of a square wave signal should be safe for TV receivers?

I am experimenting a bit with TDR (time domain reflectometry) and for it I am generating a square wave with up to 10kHz and a rise time of about 1-2ns. Now I would like to put that thing to use and ...
-2
votes
1answer
201 views

Does this TV power supply board look damaged? [closed]

So a suspected power surged killed out Mitsubishi WD-65738 DLP TV the other night. Upon looking up the error code "48", I ended up buying and replacing the main board PWB-MAIN. While this didn't seem ...
0
votes
1answer
488 views

Can I use a 12v battery to power my 89W TV [closed]

I want to use a DC 12V battery to power my 89 watts LED TV. Is it possible and how long will it last?
2
votes
1answer
61 views

Do LCD's or Plasmas have a circuit for each pixel or they are lit in an array fashion?

I'm trying to understand how LCD's display a picture. I've read articles and papers, but sometimes I get contradicting information. Some say that each pixel ( actually a sub-pixel ) have their own ...
5
votes
2answers
400 views

Is my LCD TV doing some sort of dithering? [closed]

I'm using a 32" 'LED' TV as a monitor (1920x1080 over HDMI). I've been noticing some annoying horizontal stripes where the source is displaying grey pixels. It seems that what's happening is the TV ...
1
vote
1answer
301 views

Why is the refresh rate of most LED LCD TVs 60Hz?

Can anyone explain to me why (at present day) the refresh rate of most LED LCD TVs is 60Hz? Is there a physical limitation to the technology of LED TVs that make it much more expensive to implement a ...
-2
votes
1answer
240 views

Possible causes for television switching on by itself [closed]

I have an LG LCD television set that has served me well for about five years now. Only recently has it started acting really weird. All of a sudden it will turn on, when turned on it will go to menu ...
-2
votes
1answer
202 views

Strange TV Blue Screen issue on switching on any home appliances [closed]

i have recently purchased Android Tv Box CS928 from Chinese site http://www.aliexpress.com/item/CS928-Android-4-4-kitkat-Rk3288-A17-quad-core-2GB-16GB-2-4-5-0Ghz-100M/1939723909.html The Android TV ...
-1
votes
2answers
309 views

How can I connect a phone battery to TV remote control? [closed]

I have an old tv with an IR remote control. It has become quite bothering for me to change the remote control's batteries every other week. I thought to myself why not connect a Chinese phone battery (...
2
votes
2answers
111 views

Detecting TVs with PC's graphics card

I'm interesting of how can graphics cards detecting what type of TV has connected with S-Video? TVs sent some indefiniter signal back to the computer? And how it's working (protocols, signals, freq, ...
2
votes
2answers
1k views

Split TV signal to make a video wall

I'm working on this project for University. We are generating visuals by sending audio signals from the computer to an old tv. Left channel to TV's Vertical, right channel to TV's horizontal. We send ...
0
votes
1answer
57 views

Television Radio Module or Circuit

I want to listen TV channels without display (terrestrial) just like FM Radio channels. There are lots of FM receiver circuits on the web but I couldn't find for TV channels. Is such a thing possbile ...
1
vote
0answers
351 views

Does the rt2832u chip have enough bandwidth for ATSC?

I'd like to upgrade the audio/infotainment module in my 2009 Camry. I see several off the shelf solutions, but they don't have a builtin digital TV tuner and the processor isn't as fast as I'd like. ...
0
votes
3answers
225 views

Replacing capacitor from unworking TV with some other capatitors which has not the same value [closed]

I am repairing (trying to repair) my TV. I found 1 capacitor 25V \$1500\mu\$F which i think is bad (it has some weird shape at top) I don't have any capacitors with that value but I have some similar ...
-1
votes
1answer
531 views

How boost a DVB-C signal [closed]

I receive a DVB-C signal from my broadcast TV provider, and I use coaxial cables and some splitters to connect my three televisions to the coaxial wall-socket. Unfortunately I have problems to ...
-1
votes
3answers
164 views

Why does a screen resoltion is same for both a mobile phone and a 60inch TV Screen? [closed]

Resolution of say 1080 x 720 means 1080 vertical lines of pixels and 720 horizontal line of pixels. This means a total of 777,600 numbers of pixels across the width and breadth of the screen. Now for ...
3
votes
1answer
824 views

What is this component and what is its use?

I found this in CRT TV on the CRT tube driver PCB. What are they and what is their schematic symbol?
1
vote
1answer
260 views

Will a 1950s television still work? [closed]

My company has a Philco Predicta television model H3407 as described here: Philco Predicta description. Will this TV still work with modern broadcasts?
1
vote
2answers
1k views

TV signal into an Oscilloscope

I'm plugging TV signal cable directly into an oscilloscope. TV cable looks like this: First I connected outer shell of TV cable connector to GND of oscilloscope BNC cable and center to the center of ...
0
votes
1answer
674 views

Streaming UHF/VHF/AM/FM over IP

I am working on a project that can stream TV and Radio signals over IP. I found a device to capture the signals and send them over IP realtek-rtl2832u but I am ...
3
votes
7answers
6k views

Why there is 625 lines [ PAL ] in T.V. scanning or odd lines?

I can't get why there are 625 lines in a PAL scanning system. I read R.R.Gulatti's standard book. In that there is a reason like: "Suppose there are x lines in 1 field. Then for two field its 2x....
0
votes
1answer
109 views

AV.link dongle (SCART's CEC)

I am looking for a device I can plug into an old TV's SCART port, which will feed me remote control commands (like 'arrow-up', 'OK', 'menu', etc.) received over the SCART connector's AV.link (control ...
1
vote
2answers
898 views

What is the difference between a tuner and an antenna?

I was just told by my TV's customer service that my TV had a tuner but no Antenna as a response to my question - Can I use my TV's inbuilt Antenna to pick up over the air channels? I was wondering if ...
0
votes
1answer
744 views

Differenece between TV Indoor antenna and Satellite Dish [closed]

Satellite Dish for TVs enables you to gain access to paid tv shows through subscription. I'd like to know if the Indoor antenna specs below can also get paid signals on the air and if it could be an ...
4
votes
2answers
27k views

Is it possible to combine independent digital TV antennas?

Is it possible to create a TV antenna that is composed of smaller antennas that are pointed to different broadcast centers? So in essence, many antennas for just a single digital TV. Is it possible ...
0
votes
2answers
64 views

IR confirmation

I want a system to send a signal by IR, to turn on a TV. I need to check if the TV is really on by receiving a confirmation. Is there a way to send the signal, and send an other signal from the TV to ...
1
vote
2answers
661 views

How do I operate a tuner of digital satellite receiver using a microcontroller?

I want to operate this tuner of my digital satellite receiver. This is the tuner: They wrote some numbers and words around of the tuner: and the name and model of the receiver is "...
-1
votes
1answer
981 views

How to open a 32" Philips CRT TV for service [closed]

I have an old and faithful (well, until today) 32" Philips CRT TV (32pw9309) that was purchased on 2004 and served me very well since then. Today, while the kids were watching a DVD, we heard a "pop" ...
4
votes
1answer
280 views

How do receivers know what to output to radio speaker or TV screen?

I understand that receivers are often used with mixers which take the sum and difference of two signals to make an output signal. How does a radio signal of say 102.5 MHz know to tell the speakers to ...
-2
votes
1answer
404 views

A Strange CRT TV Interlace Issue [closed]

Ours has a strange problem. The top 2" of the picture show what seems to be the two scans of the interlace are out of sync or something. When the screen is blank/black (playing just music through the ...
1
vote
1answer
291 views

Why cable TV frequency range ends at 1 GHz?

Currently frequencies 50-1000 MHz are allocated for TV and data transfers. I understand why there are limitations for aerial or satellite transmissions, but why are they retained for cable ...
0
votes
1answer
126 views

How is (non-interfering) data communication possible over the tv spectrum? What is the technology used?

I've heard that FCC-US (Federal Communication Commission - United States) has approved the free usage of TV spectrum for wireless communication. How is it possible to enable such data communication ...
-2
votes
1answer
101 views

Analog and digital cable encoding [closed]

I am looking to have a card encode multiple channels on to a single cable tv line so that several tv's in the house could change channels to a different stream from the same source like how a cable ...
0
votes
2answers
1k views

Computer case causing interference with TV

I've recently changed my computer case to a new, bigger case. However, after I changed this case over, I can no longer watch TV due to interference with the signal. I have removed every output to my ...
2
votes
1answer
389 views

How can PAL (TV) encode 3 colors in 1 phase?

As I understand it luminance is the amplitude of the signal, and color is the phase. You need 2 color signals (the third one can be derived from the other 2, like B = 1 - R - G). How can 1 phase ...
-4
votes
4answers
3k views

How can I repair my old tube TV safely? [closed]

I got an old Nokia tube television from my grandmother. I tested it, but there is no picture. I can hear the audio. The filament is not glowing. I am studying EE, but there I only dealt with low ...
3
votes
1answer
2k views

Color problems when turning a CRT TV set into an oscilloscope

I found an old CRT TV set in the garbage. It didn't work, always showing the "snow effect", even when I connected it to another device via the SCART port. So I followed an online tutorial to make it ...
0
votes
1answer
387 views

How to connect MP3 player to TV using RCA? [closed]

I have a personal MP3 player with 3.5mm stereo socket for output. I have made a 3.5mm to RCA stereo cable by connecting the shorter inputs to the centers of each of the Left and Right RCA jacks and ...
-2
votes
1answer
199 views

HDMI to Component [closed]

I'm trying to use my Raspberry PI with HDMI output to my older TV with component in. Raspberry PI -> HDMI --> COMPONENT --> TV (tv specs in link) Is there any way to do this? The screen size is 32", ...
3
votes
2answers
255 views

What are some economical ways to get a remote analog video feed?

I am a computer programmer and I like playing with robots. But I don't have access to tons of cool toys so I try to make do with what I've got. The other day I was trying to navigate an R/C car ...
2
votes
1answer
4k views

V-control broken on old (CRT) TV-Set?

I found a TV-Set in a dumpster, and checked if it's still working. Indeed it is somewhat functional, but the picture is distorted: (screenshot of the TV) Depending how bright the picture is, it get'...