Question about LG Studioworks 775N 17" CRT Monitor

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Blurred Corners Hi, My monitor has recently undergone a replacement of Flyback Transformer (FBT). Since then the corners of the monitor appear blurred. Focus for rest of the screen is ok. When I try to adjust the focus of corners using focus control of FBT , rest of the screen becomes blurred and when i adjust the focus for rest of the screen, corners get blurred. How can I get the focus for entire screen right? Please help. Thanks

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  • Amit Mittal Dec 25, 2007

    Thanks for your quick reply. I will definitely check what you said with some professional help of course.

  • Amit Mittal Dec 25, 2007

    hi,
    I did not find anything related to decousing. Can you provide any link or something else that can help me in dealing with decousing.

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  • 149 Answers

Hi there, its a decousing problem, look for the connection of the decousing which is connected behined the pic tube to the board. check some electronic parts, it may be temperature resistor, termistor, transistors, capacitor, etc.ty

Posted on Dec 25, 2007

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Posted on Jan 02, 2017

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REPLACEMENT FLYBACK TRANSFORMER SONY TRINITRON CRT TV KV-2062E IS REQUIRED


If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/

Jan 02, 2016 | Sony Televison & Video

1 Answer

What is "flyback" in a tv monitor


A flyback transformer (FBT), also called a line output transformer (LOPT), is a special type of electrical transformer. It was initially designed to generate high voltage sawtooth signals at a relatively high frequency. In modern applications it is used extensively in switched-mode power supplies for both low (3V) and high voltage (over 10 kV) supplies.

this is use only on monitor the old one that used CRT TUBE.
d4d82a50-3a2b-490d-9c1a-208982961228.jpg

Dec 01, 2013 | Samsung SyncMaster 793DF 17" CRT Monitor

1 Answer

CRT monitor screen is out of focus.text and other images looks blurry


Hi,

This kind of symptoms can be correct by the focus adjustment at the flyback transformer. FBT mostly has two control knob (Focus and Screen), focus is usually at the top one like in the sample picture below.

jdvillanueva_86.jpg

Open the back cover of your unit and then locate the FBT. Power on the unit and try to adjust the focus knob.

If the symptoms can't be cured by the this step, this is an indication that the CRT socket is already faulty. You have to replaced this parts and then make some adjustment at the focus knob of the FBT and your unit will back to normal again.

CRT(picture tube) socket

jdvillanueva_87.jpg


Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Jdvillanueva

Jul 14, 2011 | Samsung SyncMaster 753S 17" CRT Monitor

1 Answer

When i switch dnie jr on i think the picture gets blurred even with maximum sharpness on dvd.


The problem is on The Focus ( FBT=Flyback Transformer) setting, You can adjust it to ge the picture more sharp. or you can replace the Socket of CRT/Flat tube..

Oct 06, 2010 | Televison & Video

1 Answer

No pix/sound, just high pitched whistle


Ur tv the high voltage it dead,the FBT,the flyback transformer.The big black block of plastic with a red wire with a black cap that hook up to the CRT(tv tube) is dead.The FBT,flyback transformer needed it to be replaced to solved this problems.Call the shops,take estimates for the best deal to do the repair.This is one of the main part of the tv to put HV in CRT(tube tv).It pretty hard to find this FBT these day,because of the discontinue of making of Amalog tvs.

Jun 06, 2010 | RCA 35V432T 35" TV

1 Answer

Adjusting Brightness on LG Flatorn Monitor


You cannot adjust the brightness with the key board. If the brightness control on the monitor is not working. It may due the defect of screen control on the flyback transformer. You have to replace the flyback transformer (FBT)

May 23, 2009 | LG Flatron F700P 17" CRT Monitor

1 Answer

Need to replace Flyback Transformer


FBT just solders in and out you do not have to have sams which now comes on disk to replace Fly.You need part # to FBT there is only 2 wires to hook back up .

Dec 22, 2008 | RCA Scenium D40W20 40" Rear Projection...

1 Answer

Hi, my hp montior has started to become blurred.


Hi,

Assuming that your HP monitor is conventional CRT type and thatno hardware/component fault, the dimness of a monitor signifies near end of life of the CRT (tube).

There are a few tricks/tweaks that can be done but of course these are just prolonging the inevitable. Additionally, this would require experience (not only familiarity) working with high voltage circuitries. Should you want to give any of them a try, they are:
  • Adjust the Screen controller at the rear of the Flyback Transformer (FBT) to maximum effective brightness. It may also be needed to adjust the Focus control;
  • In some versions, there are sub-bright and/or Automatic Brightness Limiter (ABL) trimpots soldered direct to the PCB that can be adjusted;
  • the heater voltage can be slightly increased either by using a stepdown transformer that has multiple taps about 1~2 amps. In some instances, the heater has an external loop around the core of the FBT, adding a turn or so would also serve the same;
  • adding a 100uF/160V capacitor after the diode of the FBT's output that supplies the B+~70VDC of the 3 color drive transistors.
Again, all of the above require experience and knowledge of electronic components and circuitry, use of a soldering iron and working around high voltages. If you are not comfortable going through this route, perhaps your best bet would be to seek the services of a qualified professional.

If your concern has not been corrected after completion of the above procedures, you may need to replace the monitor.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FIXYA.

Oct 30, 2008 | HP Computers & Internet

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