Question about NEC AccuSync 90 19 in.CRT Conventional Monitor

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Screan on monitor not lighting up.

The power supply is good, but thers no high voltage, the flyback transformer is good, what could be the caus why the screan is not lighting up?

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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.
Open yoke.
Malfunction in horizontal B+ regulator circuit.
Faulty solder joints.
Short in CRT.

Posted on Apr 29, 2010

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Posted on Jan 02, 2017

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1 Answer

What is "flyback" on tv monitor


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.

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

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

1 Answer

Haier 21 inch CRT TV picture getting distorted due to voltage fluctuation which component has to replace?


The picture tube is affected by the focus voltage from the flyback, if the voltage is fluctuating, it can be caused by the picture tube or the flyback transformer, the most likely is the high voltage transformer.

Mar 10, 2012 | Computers & Internet

1 Answer

I have LG CRT monitor 17 inch .when i switch on my crt it start sparking sound but not actual spark . the sound was so iritating & sparking shows on screen but not inside the monitor. So what was the...


hi,
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.
ok

Aug 02, 2011 | LG Studioworks E700S 17" CRT Monitor

1 Answer

I have a samsung monitor SyncMaster93DF it stopped completly with a little sound (tick tick ) i oppened it and found the hot transistor shorted (st2310) i replaced it with bu2527 because i couldnt find the...


try C5804 or J6812 instead of bu2527..replace IRF630 in 50 volt supply line.it may b faulty...bt if problem after that then flyback transformer may b faulty. repalce it with same one.

Sep 05, 2010 | Samsung SyncMaster 793DF 17" CRT Monitor

1 Answer

Where is transformer located in jvc interiart tv model no av-28x4sr when i turn on tv the power light comes on but the screan stays blank and a clicking noise comes from back of tv the tv is about four...


good day your tv has no transformer.the subtitute of transformer is avr or automatic voltage regulator. maybe your tv has a defect,either flyback transformer or the main board. has a shorted parts.

Jun 21, 2010 | Televison & Video

1 Answer

Power light blinks screan is dark and no adio


Ur high voltage it dead.The FBT,the flyback transformer it dead.The big block of plastic with a red wire with a cap hook to a CRT(tv tube).

Nov 03, 2009 | Toshiba 36A43 36" TV

3 Answers

700e Lg crt monitor problam power on eht on but not display


The normal crt monitor have a demo display when you unplug the vga cable to PC like this image below.. fd6b6b9.jpg
Note:
If the crt monitor green LED light steady and heater beam have light, the horinzontal and High Voltage supplied to tube is completely good. If you encountered this problem just focus on video section of crt monitor. But before you start... find the flyback transformer behind this they have two controls screen & focus. After you found it plugin the monitor use plastic precision or small screw philip driver for safety to high voltage at horizontal area choose screen control rotate it to clockwise direction follow this....
5b5166c.jpg If the display responses or from dim to lighter 100% you have a problem to ABL find this at the bottom of horinzontal section near at flyback transformer pins trace the line of ABL for dried solder, open resistor if nothing happen find the Video IC at chroma section and replace it. follow this...
3c6e89c.jpg For LG & Redfox you found LM1269NA Visit this site for seaching semiconductor matches www.alldatasheet.com Good luck.

Check this site for searching semiconductor
www.alldatasheet.com

Aug 12, 2009 | LG Studioworks 700S 17" CRT Monitor

1 Answer

Please tell me what is flyback 1600V working voltage PF (near the horizontal transistor)


Hi

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.

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Jul 14, 2009 | SAMTRON 55V 15" CRT Monitor

2 Answers

Monitor repair


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.

Apr 26, 2007 | LG Flatron Ez T710BH 17" CRT Monitor

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