Question about CTX PV 720 17" LCD Monitor

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Need parts monitor seems to go dark after 15 seconds.  It actually just dims so much you have to put a light shining on it to see the test screen.  I am looking to find the board with the ballast on it to replace it.  Any Ideas?

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  • Walter Chavez Mar 17, 2008

    I have the same problem with the same monitor PV720, 3 of them, I believe it is the Inverter board, I am trying to locate thr part I think the part # on the board is INV17-411A, or FS2B1046.

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Hi...there,
The problems on the backlight inverter power supply. Open it up and check all the capacitors, it look like a tiny battery cap on the side had writing on it. (Example 1000uf 16v ) if you are lucky you can spot it right away...with a bulged on top of each caps. If not, just replaced all of the caps... Good luck!

Posted on Dec 07, 2008

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1 Answer

I have sam 51on lcd moniter with dim display problem


The screen displays is dark/ dim because there is no backlight.
There are two parts responsible for lighting the display. First is the CCFL (Cold Cathode Florecent Lamp), which is the back light and the second is the Inverter board, which provides high voltage to the CCFL. Either of the parts can be faulty or in some rare cases both.
In most of such cases that I received for repair, it was Invertor. Inspect the Invertor for any apparant physical damages (burnt coil or circuit components etc). Inverter can be checked by disconnecting the present CCFL and connecting a fresh/ working CCFL (Backlight) before actually removing the CCFL as it is difficult and unnecessary to take it out if its not the fault.

I SUGGEST THAT YOU SEEK PROFESSIONAL ASSISTANCE FROM AUTHORISED SERVICE/ REPAIR CENTER FOR REPLACEMENT OF CCFL OR INVERTER.

Hope it helps! Good Luck!
CreativeTECH

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My samsung 940b it has a clear bright screen ( as normal ) just for 2 seconds then the screen turns dark but you can see very very dim Window logo.Turn off the power ( does not matter for how long ) when...


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You should be covered under warranty!

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Hi,

Based on your description, the problem could either be:
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  • inverter.
Since the Acer AL1512 works fine except dark, we can rule out the video interface, power supply and ontroller. Again, the display showing (even dimly) is significant, it tells us that the components are working except that for some reason and most likely it is heat related. Possibly a cold solder, a loose connection and/or a dried up capacitor. You could actually verify this be shining a flashlight diagonally across the screen and some semblance of the desktop albeit dark would be slightly visible.

What is required is opening the LCD lid/panel to perform repairs. This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional.

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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LCD starts to display for about 2 seconds then goes dark.


lamp(s) perhaps.... with an LCD monitor (the desktop kind) you can shine a lite behind it. if you can see things on the screen it's the lamps... if you can't it's something else.

Robert

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Dim picture


This is the way how to examine where the problem is. If the screen is going dark. You have to check that you can see the image on screen by shining a flashlight into the screen, not directly but find the best angle to the screen and take a look very closely. If you can see the icons (Power on both cpu and monitor), there will be a minor problem. Like me, I can see window image using flashlight and check lamps inside. Some of them were broken. If you cannot see any icon on the screen. I would say that there are some problems with inverter board. If you have soldering tool and want to fix it by yourself, check the caps first. It may cause this problem. Some caps might show leaking or dark spot on the board because of too high temp. If you don't have soldering tool, you better go get a technician to do so.

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Monitor goes blank


Sounds like the back light inverter board is bad. It's a very common problem. LCD's use four small cold compact fluorescent bulbs to back light the display. (thats what gives the LCD it's brightness allowing you to see it) The inverter board runs these lights and when they go bad they will typically show symptoms like you have or the monitor power light comes on and you have either no display or a very dim display. If you ever have one that has no display but the power light is on you can check by shining a flashlight directly into the LCD from the front (right into the screen) if you can see an image then it's either the inverter board (most likely) or the CCFL bulbs have gone bad. The inverter board and CCFL's are replaceable. Good Luck, El Duderino

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