Question about Computers & Internet

1 Answer

Monitor display is fuzzy and pixelated - Computers & Internet

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 1,099 Answers

Hi.

Focus voltage on the CRT is usually in the range of 2-8 kV DC and should be controllable over a fairly wide range by the focus pot - usually located on the flyback or a little panel in its vicinity:

If adjusting the pot results in a position of acceptable focus, you may be done. It is not unusual for the focus setting to drift a over time.

If the setting is already as good as possible but not really good enough, the CRT may be tired. Alternatively, the filament voltage may be too low. Check for bad connections in the filament circuit.

If the optimal setting is out of range of the focus pot, the problem is likely leakage in the focus divider in the flyback or one of the components on the CRT neck board.

Also see the sections: "Focus adjustment" and "Focus drifts with warmup".

The focus wire usually comes from the flyback or if the general area or from a terminal on a voltage multiplier module in some cases. It is usually a wire by itself going to the little board on the neck of the CRT.

If a sparkgap (a little 2 terminal device with a 1/8" gap in the middle) is arcing with power on, then the resistive divider has shorted inside the flyback, focus board, or HV multiplier - whatever you TV has - and the this unit will need to be replaced. Ditto if the SCREEN control affects focus and/or vice-versa.

Using a suitable high voltage meter (range at least 10 kVDC, 1000 M ohm or greater input impedance), you should be able to measure it connected and disconnected. The ground return will be the outside coating of the CRT which may or may not be the same as the metal chassis parts. If the voltage is very low (less than 2 kV) or too high and the pot has little effect:

When measured right off of the source disconnected from the CRT neck board, then the problem is probably in the focus network in the flyback (or wherever it originates). Sometimes these can be disassembled and cleaned or repaired but usually requires replacement of the entire flyback or voltage multiplier. Note: you may need to add a HV (10 kV) capacitor between the focus wire and DAG ground to provide filtering so you get a DC level for your meter.

When measured with the focus wire attached to the CRT neck board with the CRT connected but reasonable with the CRT unplugged, there is probably a short between the focus and another electrode inside the CRT. See the section: Rescuing a shorted CRT.

When measured with the focus wire attached to the CRT neck board with the CRT unplugged, there is likely a component on the CRT neck board that is leaky or breaking down. Also, check for decayed (tan or brown) glue which may turn leaky with age.
Good Luck...

Posted on May 30, 2010

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Acer monitor has green lines on the scren


Liquid Crystal Display (LCD) screens use less energy and display a clearer picture than the Cathode Ray Tube (CRT) displays that preceded them. These new LCD screens now dominate the computer monitor market. From time to time, however, pixels can become stuck and a green line can display on the screen. Removing this line is sometimes possible without sending the screen to the manufacturer for expensive repair.

Locate the pixels that are stuck on the screen. Download a free screen repair software program, such as UD Pixel or JScreenFix. Run the software and allow it to find and attempt to repair the stuck pixels. Turn off the LCD monitor. Apply the damp cloth directly over the stuck pixels and use a gentle pressure to spread the liquid within the screen.
Things You'll Need Pixel repair software Damp cloth LCD screen 5 Ways To Fix A Stuck Pixel On Your Screen
http://www.makeuseof.com/tag/best-software-solutions-to-fix-a-stuck-pixel-on-your-lcd-monitor/

Feb 22, 2013 | Acer Computers & Internet

1 Answer

I have a new BenQ G2220HD monitor connected to my MacBook as an external display. Since I've had it, it's had problems such as flickering pixels, lines that flicker, screen goes gray and flickers and is...


Your onboard video card is going bad on you computer. Some shops may sale an external video device which can be installed in place of your onboard video and it will fix your problem. Average costs aer about $50. Before you try YET ANOTHEr monitor, please try to hook the computer up to a tv to see if the problem pesists, if so, it is time for the above video adapter

Jan 28, 2011 | BenQ G2220HD Monitor

1 Answer

HP w1907 monitor has fuzzy text


Procedures of acquiring high definition pixel quality
1.power on the computer wait until the desktop of icons display after booting has been completed
2. using the arrow of the mouse or pointer to an area on the desktop without icons, right click to display a prompt list
3. locate the appearance and setting prompt on the list.
4. a click to provide the options to increase the picture quality termed pixels
5. LCD monitors could produce several thousand pixels, select a choice nearly approapiate for reasons explained
a. the highest selection of picture quality provided on the list for a monitor powered by a separate computer with extremely dense graphics like known for modern gaming could cause monitor to blank out as precaution.

b. when selecting a picture quality from the list provided on the appearance settings area after a right click on the desktop, be sure about the compartibility of the monitor and computer unit, explained
c. most modern retail provide system units with higest definition pixel capabilites for several funcitons as gaming graphic and design, connect such a unit to an old monitor would display low quality definition pictures. However, that could be fixed by adjusting the appearance setting only with caution not to select the most highest available from the list of pixels.

Dec 06, 2010 | HP w1907 LCD Monitor

2 Answers

My LCD Monitor "X163w" was purchased in January 10 a black spot is visible at the bottom of the screen. Please advise us the reason & cure, when & where? at email: shrihanuman31@gmail.com


Sounds like a dead pixel(s). Depends on the warranty as to how many dead pixels are allowed before warranty is used etc...most manufacturers have different rules.

Oct 19, 2010 | Acer Computers & Internet

1 Answer

Fuzzy screen on Gateway FPD1975W TFT LCD Monitor


With the pixels acting up and the monitor having the same problem on any computer that its connected to. The screen itself is bad and since there are no replacement screens for that monitor, you would have to buy a new monitor or get it replaced if its under warranty.

Jun 02, 2010 | Gateway FPD1975W 19" LCD Monitor

1 Answer

Horrible fuzzy display on my external lcd tv monitor - sadness


You need to change the resolution and colour quality under graphics properties on second monito. Put the settings back under the advanced tab, your just pushing new monitor over its limits. You dont need to have the same resolution set as your PC screen. Hope this works for you.

Mar 18, 2010 | ASUS Eee PC 1000HE Netbook

2 Answers

Display suddenly becomes pixelated or fuzzy


just goto mycomputer then right click select properties
display setting adjust the bit of the color make it 32 bit

or if your O.S vista just right click on the desktop click personaliza display setting. change the color into 32bit .

Mar 05, 2010 | Dell Vostro 1310 Notebook

1 Answer

What disavantage about LCD?


The most notable disadvantage to LCD screens is their fixed or native resolution. An LCD screen can only display the number of pixels in its matrix and no more or less. It can display a lower resolution in one of two ways. Using only a fraction of the total pixels on the display or through extrapolation. Extrapolation is a method whereby the monitor blends multiple pixels together to simulate a single smaller pixel. This can often lead to a blurry or fuzzy image particularly with text when running the screen below is native resolution.
Video was problematic with early LCD monitors because of lower response times. This has been overcome by many improvements, but there are some that still have low response times. Purchasers should be aware of this when purchasing a monitor. However, the improvements are often work arounds that can actually lead to another problem of reduced color clarity. Unfortunately, the industry is very poor about properly listing the specifications for monitors to help buyers understand and compare monitors.

  • Blurry images Outside Native Resolution
  • Motion Blur on Fast Moving images
  • Some Models Have Reduced Color Clarity
Conclusions At this point and time, most consumers will likely be purchasing LCD monitors over CRTs. There is almost no difference in the cost to consumers thanks to production improvements in LCDs and the reduction in the production of CRTs. Typically CRTs will only be seen sold with the least expensive of desktop computer systems or by those with special imaging needs such as graphics and medical professionals.

Mar 04, 2010 | Samsung SyncMaster 2233BW 22" LCD Monitor

1 Answer

Pictures on monitor are fuzzy and pixelated. How do I fix this?


Hi shawnpoynter
You may have to change the resolution of your monitor. You may be using a low resolution at the moment.
  • Go to the Desktop, right click,
  • Left click on Personalyse,
  • click on Display settings -
  • choose a higher resolution.
Hope this will solve your problem.
Have a good day.
If this answer work for you, please give a rating.
luciana44

Oct 31, 2009 | E-Machines eView 17f3 17" Flat CRT Monitor

Not finding what you are looking for?
Computers & Internet Logo

Related Topics:

612 people viewed this question

Ask a Question

Usually answered in minutes!

Top Computers & Internet Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

kakima

Level 3 Expert

102366 Answers

David Payne
David Payne

Level 3 Expert

14161 Answers

Are you a Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...