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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Re: Blurred Corners

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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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.

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

1 Answer

Internal adjustment for focus

There are two buttons on a big black block of plastic call FBT-known as flyback transformer.One button for adjustment for brightness and darkness of the CRT tube screen the other button for the crt tube screen focus.U can easily do adjustment with a flat head screw driver.

Sep 12, 2012 | Cornerstone Professional P1500 21 in.CRT...

1 Answer

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


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.


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


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


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

1 Answer

Hi I have a Samsung 56V monitor . The letters have been appearing blurred for quite some time .

after 4 or 5 yrs EHT ( transformer that supplies voltage to CRT TUBE - MONITOR TUBE ) becomes weak - then 1 of the indication is ....picture becomes dull...blurr... (less brightness & less contrast , no clarity ) solution is EHT ( also called as flyback transformer ) should be replaced....... {{ few details about EHT---- its size will be around 3inch X 2inch X 2inch ---it will have 2 or 3 knobs to adjust focus , brightness ------ at bottom around 10 pins will be there ------- from EHT 1 thick red colour cable goes to CRT TUBE --------- on EHT its part number will be there }} -------- so if user is a technical person having idea about components ( resistors, transistors, diodes, etc ) , having tools like multimeter ( to check components) , soldering iron, soldering lead, flux, desoldering wig ( for removing components), etc also little experience in servicing field( compulsory) ----------------- then user can remove EHT from main board ---- take to electronic shop ----- buy same type EHT --------- fix to mainboard ( knobs on EHT should be adjusted according to picture --- after switching monitor --- this adjustment is very important ) ----------iam from bangalore (09986222774, ----- here EHT's price will be around Rs 250 ( US $ 6 ) & for my customers (in bangalore) i will take another Rs 500 (US $ 11) as sevice charge......i don't have any idea about EHT ' s price & service charge in your place.........since it is very risky job i suggest to contact monitor service engineer ------- because they are highly experienced & can fix this component very easily..

May 14, 2011 | SAMTRON 55V 15" CRT Monitor

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

Computer monitor

disconnect the flyback transformer B+ POINT. if the tick sound goes the problem may be in the flyback transformer. replace the transformer.

Apr 07, 2008 | SAMTRON 55V 15" CRT Monitor

1 Answer



Most 17 inch monitors upward have two (2) focus adjustments. They are located at the back of the Flyback Transformer (FBT) together with the screen control. They tend to "drift" as you have posted after some time of usage. In the absence of calibrating instruments, you simply have to wing it when adjusting. It might be of help if you use a squarish mirror to view the front while adjusting the controls at the rear. Of course the usual precautions apply when working with live units especially within the high voltage area.

Should you not be comfortable opening the unit, adjusting while "live", you may need to seek the services of a qualified professional.

In some extreme case, no adjustment could and would correct a problem if the CRT has already developed some form of ion burn on its mask and therefore would require replacement. At times, you may need to consider the cost of repairs (parts & service) as well as the down time which may negate justification for repairs and therefore the prospect of a new monitor might be better off.

Hope that this be of some help/idea. Pls post back how things turned out or should you need additional information.

Good luck and kind regards.

Feb 01, 2008 | Mitsubishi Diamond Pro 900U 19" CRT...

2 Answers

How to replace flyback acer 14' 11d

hi there, there is a part number of the flyback at the body of it and you can repalce it by telling to the store the number of the flyback transformer. ty

Dec 24, 2007 | AcerView 78ie 17" CRT Monitor

1 Answer

Unclear images

Remove the rear cover and adjust the focus control on the flyback. Use a non-conductive probe, available as adjustment tools from any radio shack. On the FBT (Flyback Transformer) you have two protruding adjustments - one marked screen, the other focus. The screen adjustment increases the G2 voltage to the crt and brightens the picture by increasing the voltage exponentially. You don't want to adjust the screen voltage. The other is the focus, you can easily turn that clockwise or counter clockwise and watch the screen to set it at your preference.
Hope this helps.

Nov 11, 2007 | E-Machines 17F2 17" CRT Monitor

1 Answer

IBM E54 15 in.CRT

ello,hope this thing coud help.Have you already replaced your
FBT? is your screen control from the flyback working well, if not-
chage your FBT.

Sep 11, 2007 | IBM E54 (Pearl, White) 15 in.CRT...

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