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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SONy

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.

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.



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.

Jdvillanueva

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..

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.

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)

Hi

What can i do for you?

Thanks!

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 .

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.