Question about Hansol Multitech 920p 19" CRT Monitor

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Screen Whine There is a constant high pitched whine being given off from the Hansol 920P monitor which has just started recently and I was wondering if it is a fixable problem?

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Re: Screen Whine

Hi, constant high pitched whine from most monitors have something to do with the horizontal frequency which is partly affected by the screen resolution as set in your computer display properties. Try lowering down your resolution or go into safe mode. if the whine disappears, it may be that the monitor is not fully capable of displaying too high a resolution. If the whine continues even at safe mode or lower screen res, then you would need to consult a qualified technician to check for defective components in the horizontal circuitry of your monitor. I wouldn't recommend that you take look due to the presence of extremely high voltage in that area. Hope this be of some help. pls post again how things turn up. kind regards.

Posted on May 20, 2007

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I am using Hansol 730E monitor and recently it start to make slight vibes on screen in horizontal way. I tried to change refresh rate and its no good. I tough that it is magnetic field but i moved monitor...

Being a rare tube monitor i am inclined to say it is nearing end of life. You have done the right thing by moving around unless you are moving other magnetic or power source items with it. Have you tried connecting to another computer - subbed out cables to eliminate that issue? testing on another computer who help determine if monitor or not. might be video card??/ since you are having DX issues I would start there. There is not much more you can do that is not dangerous - ie - increasing the voltage etc..

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Monitor no raster power has been ok


The screen is blank with no raster at all. There are indications that the channel numbers are changing in the display. This indicates that some of the low voltages are present but these may be derived from the standby supply.
Assuming there is no deflection and no High Voltage, you either have a low voltage power supply problem, bad start up circuit, or bad horizontal output transistor (HOT) or other bad parts in the horizontal deflection.

Check for bad fuses.

(If you have High Voltage as indicated by static electricity on the front of the screen and you hear the high pitched whine of the horizontal deflection when it is turned on, then the following does not apply).

Use an ohmmeter to test the HOT for shorts. If it is bad, look for open fusable resistors or other fuses you did not catch.
Assuming it is good, measure the voltage on the collector-emitter of the HOT (this is safe if there is no deflection). You should see the B+ - probably between 100 and 150 V.
If there is no voltage, you have a low voltage power supply problem and/or you have not found all the bad/open parts.
If there is voltage and no deflection (no high pitched whine and no HIGH VOLTAGE), you probably have a start up problem - all TVs need some kind of circuit to kick start the horizontal deflection until the auxiliary power outputs of the flyback are available. Some Zeniths use a simple multivibrator for this - a couple of transistors. Others power the horizontal osc. IC from a special line-derived voltage. The multivibrator type are sometimes designed to fail if someone keeps turning the set on and off (like kids playing) since the power rating is inadequate.
Test the transistors if it is that type with an ohmmeter. If one is shorted, you have a problem. The usual way a TV service person would test for start up problems is to inject a signal to the base of the HOT of about 15.75 kHz. If the TV then starts and runs once this signal is removed, the diagnosis is confirmed. This is risky - you can blow things up if not careful (including yourself).

If you hear the high pitched whine of the deflection and/or feel some static on the scree, confirm that the horizontal deflection and high voltage are working by adjusting the SCREEN control (probably on the flyback). If you can get a raster then your problem is probably in the video or chroma circuits, not the deflection or high voltage.

hope this helps......

Aug 06, 2010 | SAMTRON 77V 17" CRT Monitor

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E screen of my monitor(computer) when i open a some game are shakin


Jul 01, 2010 | Hansol Multitech 920p 19" CRT Monitor

2 Answers

My new Acer P191W LCD Monitor has a high pitched whine that is extra loud on pages with rich and dark colors.

The PSU "power supply unit is taken on a lot of noise from the outlet. Can you tell us if you have it streight plugged into to a 120V AC outlet or is it plugged into a strip? The Solution for both is NEW strip i recommend APC or plug it into a strip and check the outlet and make sure its properly grounded this should shore up this problem or the unit itself is going out.

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How to fix brightness on hansol 920p if it is already on max in manu? is there some button in case to do that?

There are ways to bring the brightness up in a CRT monitor. These should only be attempted by a servicing pro. There are extremely high voltages involved.

Mar 24, 2009 | Hansol 920 A 19 in.CRT Conventional...

1 Answer

Monitor making humming noise

First try moving speakers away from monitor a bit. Some speakers magnets actually reduce the life span off monitor. I hope I am wrong but usually a high pitch whine is the High voltage Transformer. Costs more than the monitor. All you can do is continue use till it goes. Speakers usually deteriorate the tube itself. HVT are just one of those parts that go due to use. Hope it gives you more enjoyment before it goes. Good luck and try to have a good day.

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2 Answers

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To my knowledge, it is not the zoom that has to be adjusted but rather the horizontal width, zoom would expand all (to, bottom & both sides) whereas your only concern are the two sides.

Should the horizontal width not fully expand, then there is an internal problem with the horizontal deflection circuitry which could either be the yoke, a capacitor or shunt diodes. In certain instances, a below normal voltage at the mains or the internal power supply could also cause this.

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.

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1 Answer

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Crackling sounds are probably due to a couple of capacitors failing due to age, on the control board. (They can also "whine"). Should be easily replaceable by any experienced technician. Not a difficult job.

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Lcd monitor failure

your monitor need to be service so take it to service center if you are in mumbai you can call for service

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No Image

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.

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