Question about Dell P780 17" CRT Monitor

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Left down corner of the screen is not focused

The problem appeared with unexpected shut down of the monitor and loose of focuse before that of the down left corner.When the computer is started the focuse seems to be ok for some time but later it is seen a red and yellow line(triangle upwords) and the green "START" is doubled.This can be impruved using the "convergence" of monitor menu but the other part of the monitor comes to be out of focuse.Is it possible to adjust the focuse separately or not.If it is hardware problem what can I do. Thank you.

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Re: left down corner of the screen is not focused

Sorry to say but it sounds like your deflection is on it's way out.
The best option would be to get a cheap used LCD now while you have the chance since repair of your current CRT will cost as much if not more.

Posted on Apr 08, 2008

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Image not focused

Possible worn out tube. The focus adjustment is on the flyback transformer and has to have the back cover removed to access it. The flyback will be a black and have a red wire connecting to the crt tube. This is very high voltage and can be dangerous. With a plastic screwdriver you can turn the focus adjustment knob on the transformer. Do not adjust the screen control knob. If the focus does not clean up, then the tube is probably worn or the flyback is bad.

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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...

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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

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Horizontal lines dark background Problem - Compaq FS7600 17" Flat-Glass Monitor

1 it is generally due to poor focusing. 2 check crt base for loose or focus control wire loose. 3 if monitor is very old then crt might be weak. good luck.

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1 Answer

Screen not smooth in the sides and corners

hi there, i've done a bit of research about your monitor apparently this model is not very reliable and has all sorts of common problems including yours here's what some people said about it: Bad Points Extremely unreliable. Over a 2 year period I have had to replace 6 out of 20 monitors Main problem, the image degrades to the point where any text in the centre of the screen is difficult to read. this monitor has a blurry corner right bottom corner and a bit of a whole right section.. and its out of focus constrast is like not on full and correct and identical to the left side.. left side is crisp and perfect.. also it takes bit of time to correct the display in the screen position and pincusion, the convergence isnt impressive at all.. anyways this is what you get from cheap monitors and BTW this is made in Indonesia, i am not flaming on the country, i am just saying this monitor isnt tested or not in quality as samsung flat monitors or sony. i am disappointed on LG for the first time, well if you really consider buying this monitor, you must check the monitor screen or something if it is correct. so you dont have to cry after you came all the way back home with it.. looks like a lot of people are not happy with this monitor. just replace it they are not expensive nowadays regards

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