Questions tagged [tv]

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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How To Keep USB Port Power On Samsung TV [closed]

I have a new 32in Samsung Smart TV and a led backlight strip that connects to the USB port on the TV. While the TV is On, the USB port is powered and we can use the light strip as we please. However,...
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1 answer
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TV Hisense HLE4815RT not tuning cable signal

I have a Hisense TV HLE4815RT (mainboard: RSAG7.820.5649), that suddenly stopped tuning cable signal, it just says "No signal". I tried different cables, removing some splitter, ...
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4 votes
3 answers
493 views

DVB reception: Why do I need to add a coaxial cable to my installation to improve SNR of the signal?

I have the following installation: Dipole antenna <------> Coaxial cable (3 m) <-----> DVB receiver If I connect my dipole antenna directly to the DVB receiver, removing the coaxial cable (...
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-3 votes
2 answers
130 views

Can coaxial TV aerial cables be flat/ribbon? To go under thick rug for TV opposite aerial socket

A round shaped one would cause a ridge in the carpet. I already have setup a flat ethernet cable under the rug for similar scenario whereby device is opposite ethernet socket. Update it's to carry DVB-...
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1 answer
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My speaker connected to my TV is making weird noises only when playing videos [closed]

Apologies if this is the incorrect forum, if anyone knows of a better forum to ask on I would appreciate the redirection. I have a very specific issue regarding audio playback from my TV. I have a ...
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1 answer
47 views

Reduce audio signal from TV when volume exceeds a certain level

I hate how loud action scenes are in movies, compared to how low the talking parts are. My TV is currently connecting to some speakers with a jackstick. Is it possible to measure the volume with ...
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1 answer
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How to switch off the CATV signal on a splitter port

I'm trying to create some automation of switching off the CATV signal on a splitter port. Using a regular 5V Arduino relay module I've tried to interrupt the wire from the center of the coaxial cable ...
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1 answer
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Defective Transformer Replacement

I've been working on repairing a TV psu, and discovered that the transformer in it is faulty (reading O.L. on every combination of pins except for diagonal in ohms mode on the DMM) I've been looking ...
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2 answers
106 views

Fixing composite video distortion caused by brightness changes

I'm modifying an old CRT to take NTSC composite input (it only accepts RF over coax.) I have got a good signal going in but it has this weird distortion going on. When the image is dark the pixels may ...
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118 views

How to convert composite AV signal or RGB to luma (grayscale)?

As the title says- how can you convert composite signal into luma?? As we all know, composite is just what it says, composite video with grayscale and color signal combined and luma is just grayscale. ...
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1 answer
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What is 'mis-registration' and 'mis-collimation' of television signals?

I was reading about early televisions and television cameras, and I came across these terms with no explanation.... They appear on Google on a few pages, but again I cannot find a definition....
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5 answers
130 views

what do the colours of the wires on stereo speakers signify from old TVs and laptops? [closed]

I have a few laptop and a TV stereo speakers salvaged from old electronics in my possession and I have noticed a pattern that I cannot understand. Both the left and right of these speakers have two ...
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2 votes
0 answers
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Why does changing CRT to HDTV lose antenna channels? [closed]

We have an internal antenna that is connected to a tiny CRT TV through a digital converter box. I recently replaced this CRT TV with an HDTV, and I removed the digital converter box since the HDTV ...
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1 vote
0 answers
92 views

Replacing a 6 V LED backlight with two 3 V LED backlights

I have a 65" TCL TV which have backlight problem and I have another 60" TCL TV with broken screen. Now when I opened both TV to swap with LED backlighting strips, and I and I noticed the 60&...
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Why my television provider doesn't measure the coaxial cable length?

I recently put cable TV in my room (we already had cable TV before, but not in my room). The technician from my TV provider, through a split, ran a coaxial cable up to the TV in my room. When he did ...
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Can you find informations about this IC? D61422F1

Could you find the information about this IC, like its datasheet or something. The IC name is D61422F1 17B and the next line is 1317EV007G Here is the image: I found this IC in a TV box, in this case ...
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1 answer
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Meaning of TV Backlight LED strip details

I am learning electronics and I just disassembled a broken TV with the purpose of reconverting it into a smart light lamp. The issue is that I don't understand the details of the backlight LED strips. ...
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troubles getting serial port tv to work

i recently posted a question, but didn't had an answer (my fault :) ). my question wasn't straight-forward and clear. so my final goal is to communicate between nodered (raspberry-pi) and my lg tv. I'...
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1 vote
0 answers
108 views

How to get static on CRT screen instead of black screen?

The TV in question is a Sony Trinitron KV-14M1D CRT. I know it sounds backwards but I need the screen to show white noise for a project (oscillograph); but there seems to be a static block that ...
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1 vote
0 answers
396 views

Why don't LG RS232 commands work when the TV is on (only responds when off)?

I'm writing a new question after stumbling across this question which appeared to have similar symptoms: LG RS232 Commands partially working. As the other question noted, the power on command ...
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3 answers
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Old tvs, how did storing settings work, and what changed in the tv when we tuned a channel?

I don't have an EE background, but I would like to understand some aspects of old TVs. When we tuned channel what exactly changed inside the tv. Was there a circuit card in the tv where something ...
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23 votes
7 answers
5k views

How did old television screens with a light grey phosphor create the darker contrast parts of the display?

Many old television screens have a very prominent "light grey" color to the glass, I'm guessing from the phosphor, create darker areas if the effect of electrons make the phosphor glow? Is ...
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How to test TV LED backlight failure [duplicate]

I recently picked up a Braum (Aldi) TV from the nature strip to play around with. The TV seems to work perfectly fine (Channels, DVD input, sound etc) except that there's no working backlight. I've ...
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6 votes
2 answers
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"shark teeth"-like PCB feature in high voltage section of modern HDTV

I found this tooth-like non-masked, solder-covered trace pattern on modern single board HDTV. It's in the 120VAC "HOT" section of the switch-mode PS. Looks like some sort of spark gap or ...
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How to adjust picture geometry of a CRT TV?

I have a HD CRT TV (Silva Schneider 26 inch) which failed recently. So I took apart a working CRT TV (Philips L01-2E AA, 20 inch) and took its mainboard and connected it properly to the HD CRT tube. ...
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1 answer
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Which components should be checked on a faulty tv power supply? [closed]

So, I'm new to working with electronics and I didn't study electrical engineering or anything related. I've collected some dead tvs and monitors over time hoping that I'm gonna fix them. I managed to ...
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0 votes
1 answer
129 views

Very old dual coaxial TV outlet, how to fix it to connect to a modern TV? [closed]

i've recently moved into an older updated apartment building and want to connect to the TV outlet but have a connection that i've never seen before. Can someone point me in the right direction of how ...
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1 vote
3 answers
55 views

Light coming from the room influencing TV

Inside the TV Remote we have a LED of infrared light which sends commands to the TV. Isn't it influenced by the light of the room(if any?).I thought if an electron in the valence band absorbs a photon ...
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1 vote
4 answers
731 views

Why faulty, old CRT TV produce ozone

I have an old CRT TV which had to be switched ON for half an hour or so for the picture to stop being blurry and be 'viewable'. During this initial warm-up time there was a 'static' like noise coming ...
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0 votes
2 answers
200 views

LED indicators intensity standards

I am trying to find any resources on the LED parameters (i.e. preferred intensity and luminosity ranges) that are used as indicators in various home appliances, such as Networked devices (i.e. routers)...
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2 votes
0 answers
396 views

How to ground a flyback transformer?

I designed a 50,000 volt power supply, that I am having problems with on grounding the HV side of the output. The HV appears to be injecting HV into my logic sections through the ground, damaging the ...
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0 votes
1 answer
196 views

Ratio of colors to produce white in color television

If you consult pretty much any book on the theory of color television, it says that because the human eye is more sensitive to green than red or blue, the reference white for color television has been ...
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GSM vs TV broadcating

Is it true that GSM signal's field strength in the atmosphere is dependent on the current number of users whereas for TV and FM broadcating the field strength is usually constant, independent of the ...
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19 votes
4 answers
5k views

Why are color difference signals transmitted rather than R,G,B signals?

In color television systems back in the early days, people used to transmit color difference signals (Y-R) and (Y-B) along with Y, which is the luminance signal. My question is why are color ...
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0 votes
0 answers
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How do I reinforce a cardboard antenna for outside use?

I bought Mohu Releaf cardboard antenna. It works much better outside than inside. Mohu explicitly advises against outdoor use of its indoor models, yet I wrapped it in a plastic bag and hung it out of ...
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1 vote
3 answers
216 views

Will an RF modulator provide NTSC System M spec video from a DVD player?

I've been attempting to recreate the effect of an old NTSC television broadcast lately with the use of DVDs. The DVD-Video spec allows for up to 720 x 480 pixels at a display rate of 29.97 frames per ...
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5 votes
5 answers
2k views

Could an analog TV signal be transmitted over broadcast RF from a composite cable somehow?

My understanding is that an analog video signal (PAL or NTSC) has a particular form/structure. That signal can be transmitted over the airwaves at a particular frequency, & multiple analog TV ...
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0 votes
2 answers
77 views

Is it possible to build a fake flash drive for the TV that is in reality a share drive?

Problem I hate having to copy what I want from my PC to a flash or external drive and then stick it in the smart TV (which already has the ability to browse files on a flash drive) every time. I want ...
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2 answers
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What is this component of a TV called? [closed]

I am getting a burning plastic smell from the behind vents where this component is located. What is this component? Better quality image here: https://prnt.sc/rarfs6 EDIT: The TV in the picture is ...
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1 vote
3 answers
116 views

Why is a horizontal rod a full wavelength oriented radially to a broadcast antenna not the best receiving antenna

I have always struggled to get a good physical understanding of Electromagnetic waves. I've done the whole Maxwell's equation approach, wrote boundary element solver tool but cannot rationalize that ...
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0 votes
1 answer
440 views

Making a Remote Control for My TV from Scratch

This might seem silly to many of you, but I lost my TV remote when I moved awhile back and instead of buying a universal remote for cheap, I want to make a remote for my TV from scratch myself. I'm ...
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6 votes
1 answer
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What are these wiry protrusions on a TV antenna?

This photo shows part of a large antenna assembly which has a series of thin wire protrusions: (Source) This antenna is apparently used for TV transmission. What are those protrusions for? I'm ...
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4 votes
1 answer
299 views

How did the Telstar 525/405-line conversion system from 1962 work?

The Wikipedia article on the Telstar satellites from the early 1960s says that in order to facilitate transatlantic television signals (where the US had the 525-line (480 visible) NTSC system, and the ...
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2 votes
1 answer
266 views

How to avoid signal interference between 5 volt analog video signal and 415 volt servomotor and drivers, when working nearby

I am using a 5V borescope analog camera (Sony CCD, PAL/NTSC) for visualization purposes. This camera has a 20 meter 4 core wire, which transmits power and video signal to and from the camera. Along ...
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4 votes
2 answers
589 views

What makes "quality" analog AV cables better than cheap cables? [closed]

I want to upgrade my retro game setup from a mix of composite and RF to a mix of S-video and component, with some composite for the really old stuff that doesn't support S-video. How can I distinguish ...
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3 votes
1 answer
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Identifying SMD component 22P W8

I've been trying to identify a component on a main board for a TV that I believe to be faulty. As I haven't been able to come up with anything that I feel confident about, I'm hoping to get some ...
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8 votes
2 answers
2k views

Circuitry of TV splitters

I'm trying to understand the circuitry of TV signal splitters and associated boosters/amplifiers, and I have two questions. My situation is as follows. I have a TV aerial (antenna) in my loft. It ...
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0 votes
1 answer
202 views

Where can I get a display screen with 30 Hz or less refresh rate? [closed]

I am experimenting with a camera recording a display screen. Based on what I have read - camera recording a screen will have flicker if the refresh rate and frame rates are not synced. My mobile ...
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1 vote
2 answers
180 views

Project - How to onstruct a circuit to introduce and control a 0-300ms delay in an RF feed from a Sky Box to multiple TV sets? [closed]

Just bought a new TV! It's "smart" but where my previous dumb TV didn't, my smart TV introduces a delay over HDMI from my Sky+HD box compared to the RF2 output which is wired via coax cable to the ...
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0 votes
1 answer
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What does a TV receiver circuit look like? [closed]

I found a few circuits for TV transmitters, but no receivers. I've looked at other simpler RF transmitters and receiver, but it's not obvious to me how to reverse the circuit that I have. I want ...
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