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the "flyback" is the VERY high voltage transformer that powers the CRT through a cable that plugs into the CRT inside the monitor case. Don't try unplugging, even with power off, as it has to be discharged to ground to remove risidual voltage, like a capasitor. This voltage is about 35,000 vdc.
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.
You have to replace the flyback transformer of your monitor. Its a high voltage stepup tansformer which provides necessory volteges for the picture tube like Anode voltage, screen voltage and focus voltage. After some years of use the insulation stength of the flyback transformer will become bad and the high voltage will try to discharge trough the nearest ground poit. At that time you will hear the sprking sound. Its because of the high voltage Anode volt is discharing to the ground it will reflect on the screen. Using the monitor in this condition will result in the failure of horizontal driver transistor and even the power supply. Replacing the flybalck will solve your problem.
The Horizontal power supply voltage is low. This is provided as a "sawtooth" waveform via the CRT flyback transformer.
Some flybacks offer a voltage adjustment via a potentiometer ("pot") on the side of the unit. I do not have a schematic for your monitor, so I cannot tell you for certain if this is an option. This adjustment should only be made by a trained technician. If you are not familiar with high voltage electronics, DO NOT OPEN THE SET!
I recommend replacing the monitor. When they age, you can only buy some time before it goes for good, and prices are so low now that repairs are not usually cost effective.
How do you know the flyback is good if it is not functioning?
Some causes for no high voltage:
short or open horizontal output transistor.
open or shorted capacitors in horizontal circuit.
Defective or non functioning horizontal drive circuit.
Malfunction in horizontal B+ regulator circuit.
Faulty solder joints.
Short in CRT.
Flyback is a step-up transformer multifly the voltage depends on the size of the tube and supplied high voltage to cathode ray tube.The minimum output voltage of this is 14000v DC for 14 inches crt monitor what if your crt is 17 inches 17000v DC very dangerous if you are not electronics repairman.
the neck board of the monitor needs tube replace it is corroded with carbon if you cannot get a replacementbuy a new monitor.but also check the flyback also it could be faulty replace it check www.dalbani.com for your monitor parts or repairworld.com,good luck.
Typical failure is High voltage supply. Can you hear a high pitch whine or the relay click on and off? You will need some test point reffence voltages for the board and confirm you do not have a damaged VGA cable. It is not easy to give step by step via forum. Google "monitor repair", there were a couple good general guides that are printable. If youe high voltage tranformer (flyback) is gone, do not go any further. Price of a monitor flyback is $65 to over $100 depending on model.