I believe the most likely cause is a failure of either the EEPROM that controls your RGB cutoff voltage or G2 or "Screen" voltage to rise significantly, or a failure of a component on the CRT neck board that either allows the G2 voltage to rise significantly or the component on the video IC that blanks the screen during retrace has failed. My hunch is that the EEPROM or static-dynamic memory within the monitor and TV (which regulates many of these voltages on contemporary TVs and monitors) has either been partly damaged or reset to some type of standard value, leading you to see the retrace lines. Then then, if they aren't retrace lines at all, this is all irrelevant. Anyway, good luck with this; truly, diagnosing and repairing CRT issues these days may be difficult and costly.
Sides with colorful shadows
Whether you possess a CRT TV or have previously had one, you must have seen a colorful shadow on the edges of the screen at some point (can be seen as reddish orange shadow in the picture). It is mostly due to the presence of any magnetic device near the television. Magnets near a CRT may destroy the shadow mask, causing the incorrect colors to show in that region. (Image courtesy of humphreykimathi.blogspot.com)
It's conceivable that it's the CRT, but they're usually highly dependable and 'mature gracefully' rather than exhibiting sporadic defects. I'd have to see it to be sure, but I'm betting at least one ocean separates us. A dry joint is typically simple to identify since the component heats up when the TV is switched on and cools down when it is turned off. Solder (at least when the TV was built) is a highly soft alloy of lead and tin that is pushed by component expansion and progressively cracks. Further movement by expansion may cause the crack to open and shut, breaking and re-establishing the electrical connection. Re-flowing the solder, either by heating it or by adding a little more, will bridge the gap and reestablish a lasting connection.
Yes, there are a LOT of pots. And I preferred it that way; the color TV set on which I learned my first bit of TV repair had a slew of pots and adjustable coils, and with only the schematic and a multimeter, I managed to bring it from watchable only at night to fully operational (after a few years of fiddling around inside every other day), as well as fix the buzzing on subtitles that had been there since before I was born. That was a very fantastic set. Everything now has those fancy service menus that offer just half of what you actually need and a lot of stuff you don't need at all, as well as basically no hardware modifications. Not to add that if you can't locate the code, you're pretty much screwed. Most, if not all, sets 15 years or newer offer service menus. Aside from focus and black level, the only things you could still have pots for are V size, H position, and perhaps V linearity or pincushion.
Crt Tv Lines At Top Of Screen
By the way, ABC, FOX, and a few other stations transmit in 720p (1,280 by 720 pixels), which is scaled to suit your screen by your cable box or TV. The above-mentioned visual noise is still conceivable; you're simply not obtaining a pixel-perfect match since the content has half as many pixels as your TV. It's not very relevant to our discussion, but I wanted to bring it up. Do you have a question for Geoff? Wait for it... Click "Geoffrey Morrison" below, then click the E-mail icon in the top right to e-mail... Morrison, Geoffrey! If it's clever, humorous, or a smart question, it could end up in a post like this one. No, I'm not going to tell you which TV to purchase. Yes, I will most likely truncate and/or tidy up your email. You may also contact me on Twitter: @TechWriterGeoff.
Individuals who have a TV screen with horizontal lines now days concentrate on do-it-yourself initiatives to remedy TV screen difficulties. They may, on the other hand, call a firm that specializes in and is also recommended for TV Screen repair and replacement services. This is because they get sufficient assistance to determine the root cause of the horizontal lines on their TV screen and utilize a professional solution to resolve the issue.
Only yesterday, a lot of horizontal lines emerged on my TV screen, but only in the lowest third of the screen. They alternate between having visible lines on 1/3 of the screen and just the top three of four lines. I've included two images below that I hope help to demonstrate the problem.
The TV's vertical area of the motherboard contains faulty capacitors. Bad caps have swollen or cracked tips that sometimes spill a brown liquid electrolyte. From roughly 2001 to 2004, bad caps were a prevalent issue in electronics owing to a stolen formula for the electrolyte solution used to create capacitors. To thwart this form of industrial espionage, one component was left out of the recipe. The lack of a component hinders the creation of hydrogen gas. The cap's life is shortened by this gas. Caps have a natural life expectancy ranging from 30,000 to 60,000 hours, depending on quality and price. Replacing caps might be inconvenient. You'll need de-soldering and soldering expertise, as well as the necessary equipment. Surface-mounted caps may be exceedingly difficult to change. This is seldom the case with television. Caps have negative and positive leads; ensure that you have the right polarity, which is normally noted on the board. Replace with a similar rated cap. CRT TVs have extremely high 30,000+ voltage caps, which may be quite hazardous if not discharged properly. It has the potential to make your hair stand up! Seriously, if the circumstances are good, it has the potential to stop your heart. February 2009, mousenuts
Crt Tv Lines On Screen
4: Applied pressure around the sides of the TV where the lines appear - no change, the lines remain visible with no distortion. Although it may seem unusual, I heard somewhere that if there is a loose connection along the LCD connections, applying pressure may indicate this is the case since the lines shift with the application of pressure. 5: I've given up:(
Surprisingly, this resistor acts as a fuse for the vertical circuit, and when it opens, the supply to the vertical circuit is shut off, resulting in the horizontal line on the screen. This also led me to believe that the I.C may have shorted out and caused the fusible resistor to open. After changing that resistor, I returned to the owner and replaced the board, still unsure whether I did everything correctly this time, and this is what I noticed after applying power.
I eliminated magnetic distortion using a neodymium magnet; just get a STRONG magnet, hold it in your palm, and gently approach the damaged region of the television. If the color becomes more intense, invert the magnet; you want the color to be the inverse of what it is. (The color green should change blue/purple and vice versa.) When it happens, swiftly wave your hand back and forth to "paint" the area until it disappears. Try not to aggravate the situation, and walk rapidly; don't stop anywhere near the television or you'll polarize another region. Unless there is a speaker nearby that interferes with the magnetic field, convers are the simplest locations to correct. Again, a STRONG magnet is required; a fridge magnet will not suffice. If you have an old hard drive, you may use it to make a tiny neodymium magnet.
As previously said, there are numerous typical explanations for the appearance of vertical lines on the screen on various TVs such as Samsung tv or LG tv, including: The T-con module cable connection to the display panel is not securely linked. It might be due to a filthy flat cable connection, a kind of oxide, or other pollutants.
Crt Tv Lines Problem
First, ensure sure there are no sources of powerful magnetic fields near the TV, such as loudspeakers, refrigerator magnets, MRI scanners, and so on. A nearby lightning strike or an EMP caused by a nuclear explosion might potentially have an impact on purity. Cycle the power a few times to degauss the CRT (1 minute on, 20 minutes off) - read the section: Degaussing (demagnetizing) a CRT for more information. Use an external manual degaussing coil if the built-in degaussing circuits have no impact.
A buddy of mine phoned me about an issue with his CRT television. The issue was that the color on the TV screen was off. I went to his house and examined the TV, and there was an issue with color patches. The color was inconsistent, as seen in the image below: This symptom, in my opinion, alludes to two probable incorrect phases.
I soldered the new e-cap and tested the surrounding components for dry joints; all of the solder connections seem to be in good condition. I then switched on the television, and a regular image emerged (see photo below): Assuming that I did not identify the bulged e-cap in the previous scenario, I will begin to investigate the DC supply voltage to the vertical output IC. If the DC supply voltage is satisfactory, I will replace the vertical output IC and retest. If you want to be an expert at diagnosing and fixing CRT TVs, I suggest Humphreys Ebook. Check out his Ebook by clicking here.
Sides with colorful shadows
Whether you possess a CRT TV or have previously had one, you must have seen a colorful shadow on the edges of the screen at some point (can be seen as reddish orange shadow in the picture). It is mostly due to the presence of any magnetic device near the television. Magnets near a CRT may destroy the shadow mask, causing the incorrect colors to show in that region. (Image courtesy of humphreykimathi.blogspot.com)
