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Can't keep backlight on - BenQ Computers & Internet

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Replace LCD Inverter.

about $120.00

Posted on Jun 18, 2008

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Posted on Jan 02, 2017

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1 Answer

Veiwsonic VP2365wb backlight flickering


If it's not under warranty, buy a new one from newegg dot com.

Mar 27, 2013 | ViewSonic VP2365WB 23 inch LCD Monitor

1 Answer

When first started, the monitor screen is fine; however it dims shortly thereafter. Help


Unfortunately this might be a hardware issue. My old HP used to do this, and then the company finally accepted it back for repairs.
What happens is there are bulbs/ backlights that keep the computer screen lit. After aging, or even possibly damage, the light might be burning out.
If you send it for repair they can easily have this fixed, and provide you with a new backlight.
Hope this helps, and best of luck! :)

Mar 17, 2011 | Dell Computers & Internet

1 Answer

Monitor briefly shows video then gone when turning on. Eventually comes up but getting harder to show screen.


The backlight is going bad. This is actually common on alot of LCD monitors. It is actually not easy to find the correct length backlight (CCFL) for this size monitor and even if you did find it, it is very very hard to install. I used to do this for laptops when it was worthwhile to replace the backlights but the cost of these monitors keeps going down and down that even the labor to replace it is not enough to waste your time on it.

In the end, sell it on ebay cheap and buy another one, unless there is warranty on it, in which case, get it replaced! :)

Oct 13, 2010 | Samsung SyncMaster 2253BW LCD Monitor

1 Answer

The screen comes on for 3 seconds and goes off


This is most likely a backlight related problem. If the power light stays on after the screen goes off, then it is most likely one of two problems:

1) Something is wrong with your power/inverter board. Most likely you will need to replace bulging or bad capacitors on the power board. They will like have voltages between 16-25V and capacitances of 470-1000uF. You will need to disassemble the monitor, remove its power board, and inspect it. If you notice bad capacitors, you will need to desolder them from the board and solder on new compatible ones. This should solve the problem.

OR

2) If replacing the capacitors doesn't solve the problem, the problem may be with your backlights themselves. If you are able to test them, that would be best. Replacing them is a pain as you will have to disassemble the LCD panel itself to get them out. You will then have to replace them with compatible backlights of the same size, which you can salvage from similarly sized broken monitors.

Keep in mind that the suggested actions above are for individuals with some experiences in soldering and repairing circuit boards or LCDs. Also be sure to wear anti-static gloves or wristband and keep the monitor unplugged when performing the above stated actions.

Feb 28, 2010 | Computers & Internet

2 Answers

Mylaptop screen keeps dimming then going bright


I suspect the backlight power of your monitor. Try to find out if the dimming is indepented of the angle of the monitor (e.g. just the time that the screen dimms out open or close SLOWLY the screen). If that is correct there is a problem (cut) in the internal cable that gives power for backlight at your screen. Reply by post.

Stelios.

Feb 23, 2010 | Computers & Internet

1 Answer

Screen turns on and then goes away


This is most likely a backlight related problem. If the power light stays on after the screen "goes away", then it is most likely one of two problems:

1) Something is wrong with your power/inverter board. Most likely you will need to replace bulging or bad capacitors on the power board. They will like have voltages between 16-25V and capacitances of 470-1000uF. You will need to disassemble the monitor, remove its power board, and inspect it. If you notice bad capacitors, you will need to desolder them from the board and solder on new compatible ones. This should solve the problem.

OR

2) If replacing the capacitors doesn't solve the problem, the problem may be with your backlights themselves. If you are able to test them, that would be best. Replacing them is a pain as you will have to disassemble the LCD panel itself to get them out. You will then have to replace them with compatible backlights of the same size, which you can salvage from similarly sized broken monitors.

Keep in mind that the suggested actions above are for individuals with some experiences in soldering and repairing circuit boards or LCDs. Also be sure to wear anti-static gloves or wristband and keep the monitor unplugged when performing the above stated actions (except of course when testing voltages).

Jan 12, 2010 | Westinghouse L1928NV Monitor

4 Answers

Philips 42PF9967/10 blue light comes on the here a clicking of the relay then clicks off again and the blue light stays on and the red light at left of flashes


Hi,

Your TV must have bad capacitors on the power supply board.
The tops of the capacitors will be domed/swollen.
Replacing the capacitors will fix the problem

when you take the back off, locate the plug wires from where they come into the back of the TV follow them up and it will end in the control board. search for the capacitor that would have bulged or swelled. This was not just take a quick look, it would be so slight that it wasn't even really apparent until we scrutinized each one.

Replacing this Capacitor would solve your problem

Please leave me comment, if you need further assistance
Rnj VINODKUMAR

Oct 17, 2009 | Computers & Internet

2 Answers

Samsung monitor picture clicks off after 2-5 seconds...


Yes, It sounds like the backlight inverter circuit is shutting down. No inverter power, no backlight. On some monitors the inverter circuit will shot circuit the power power supply which makes the power light flash on some it just kills the backlight. You can usually check with a flashlight. Hold the flashlight pointed at the screen and see if you can see any of the icons or background picture. If you can then it is the backlight circuit or backlight tubes, usually the circuit.

Buddy


Jul 24, 2009 | Samsung SyncMaster 204B (Silver, Black)...

1 Answer

Elo ET1725L with no video. Flash on screen on


When LCD's "turn on" momentarily before going blank again it is an indication that the backlights have worn out. Cold Cathode Floursecent Lamps (CCFL's) have a limited amount of hours which they can be in operation for before the mercury vapor in them breaks down (or leaks out). When that happens the backlights no longer look like a load the inverter (device inside the monitor which turns low voltage into high voltage) is programmed to look for, and long story short, the inverter does not keep the lamps illuminated because of this being a safety setting, if the load no longer looks like what the inverter is looking for, it could be sustaining an open arc which then leads to extremely high temperatures, and a possible fire. The flash you see is the "firing voltage" (I think that is what it is referred to in the industry) which is a very high voltage pulse used to create the arc between cathodes in the CCFL, creating the arc takes a much higher voltage than sustaining the arc, so even if the inverter successfully creates the arc and lights the cathodes, it quickly doesn't look like a proper load and then inverter quickly turns off to prevent damage.

In essence CCFL's are usually the weakest link in LCD monitors as far as what is most prone to failure, technology has been improving, but if you keep your monitor on all day long at full brightness, never shutting it down, don't expect more than 3 years out of it :( Some brilliant LCD manufacturers recognize this problem and even make the backlights replaceable!! What a novel concept!!! But due to price gouging, the replacement backlights are usually sold for a premium from resellers, better option than the majority of LCD displays which have the backlights so integrated that you end up destroying the LCD and introducing contaminates in the process of "reviving" the display...

Your best bet if the backlights are in fact shot, is, if you are handy with a soldering iron, get the LCD apart, get out the backlights (there are probably four in there, possibly 6) measure the diameter and length, and look on eBay to see if someone is selling the particular CCFL you need-- that may be the cheapest route if you are out of warranty...

Jul 14, 2009 | Elo Entuitive 1725L-MSR (Dark Gray) 17 in....

1 Answer

Dell E172FP 17 monitor keeps blinking


That sounds like the backlight inverter board. Check ebay for the board or a repair kit for it.

Oct 22, 2007 | Dell E172FP 17" LCD Flat Panel Monitor

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