Question about Kogi L7CH Monitor

1 Answer

Possible_backlight_issue my monitor works , but won't stay lit. cause everytime i toggle the monitor off and on, it seems like the backlight blacks out 2 seconds after it's on. but i can see windows running in the background,so it is functional.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.


    An expert whose answer got voted for 20 times.

  • Expert
  • 47 Answers
Re: possible_backlight_issue

Hi goldeneye, Sounds like the backlight inverter board. Don't mind the explaination I just cut and paste this solution from one of my others. 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

Posted on Nov 26, 2006

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

HP LE1901W won't stay lit up

usually with lcds, this can be caused by a bad inverter or power supply

Jun 20, 2012 | HP L1710 LCD Monitor

1 Answer

I have a ViewSonic VX910 Monitor that hasn't been working. I bought the monitor at a thrift shop wishing to repair it after fixing 3 other monitors now. The monitor turns on fine, will sleep,...

There should be no liquid coming out from the cap at all. Is it the one that has 250~350vdc rating on it? The one in my pix has very small leak coming out, you can barely see it.
See pix here;
It should have about 160vdc on this cap, be carefull, this is the HOT (LINE) side of the AC primary circuits!

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures:

Learn about bad caps:

Capacitors kit: he can make you a set of caps for you.

Or just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Aug 11, 2011 | ViewSonic VX910 19" LCD Monitor

1 Answer

I have a samsung syncmaster 943NW which goes on for about 5 seconds and then just goes black. When restarting the screen it does the same again, goes on for about 5 seconds and then black. Is there...

I had the same problem with this monitor (Samsung 943nw)
When turned on it would only stay on for less then a full second.
When shining a light on the screen I could see what was on it, so it was just the backlight that was shutting down.

After I turned down the brightness of the monitor, the next time I powered on the screen the backlight stayed lit and it was back to normal.

Dec 11, 2010 | Samsung 943NW Monitor

1 Answer

Monitor backlight problem (Dell S2409W)

pa_ma_fi, Have you figured out how to do the flashlight test on you monitor when it's lcd panel turns black or blank n black. No, CCFL back-lit lcd monitors require lots of things to be working all together at once to light up the CCFL tubes. The new style curlie-Q screw-in, energy efficient CFL light bulbs are of the same similar technology and use an "electronic-ballast" circuit to "light-up" the lamp! You will need to check to see if pc is working perfectly with old monitor that you know is good. You should do some free reading here at fixya in my and other fixya ccfl back-lit lcd technicians profiles. ou will also need to visit YOUTUBE for "LCD monitor disassembly" and "LCD monitor repair" videos. May need printed circuit board "switch-mode-power-supply/ ccfl inverter supply " to be repaired If pc software/firmware has been determined not to be causing this on/off/on/off symptom.

Apr 29, 2010 | Computer Monitors

1 Answer

Monitor screen will not stay lit. It will only stay lit for a second then goes black.rq

The problem can be caused by bad caps in the power supply, bad inverter backlights circuits, bad lamps. Look for bad caps first, then post back what you find so we can guide you further, see example of failed monitors due to bad caps here:

Jan 30, 2010 | HP w1907 LCD Monitor

2 Answers

SyncMaster 930B takes 20 minutes at least to become visable


Oct 10, 2009 | Samsung SyncMaster 930B 19" LCD Flat Panel...

1 Answer

PLANAR Flat screen goes blank and then wil not come back on, blinks a second then dies.

Sure, you can fixed by replaced the backlight inverter or repaired it.

Oct 31, 2008 | Planar PL1910M (Black) 19 in. Flat Panel...

1 Answer

Displaying issue

That's indicated your backlight inverter are busted. Need to replaced a new one or repaired it. To repaired look for a bad capacitors with a bulged on top of each caps. Not sure, just replaced all the caps... Have a nice weekend!

Oct 11, 2008 | Samsung Syncmaster 940BW LCD Monitor

2 Answers

Monitor won't light up. Only just for a second or two.

this issue is made by defective torch or lamp at the back of LCD...


Aug 05, 2008 | LG Flatron L1515S 15" LCD Monitor

1 Answer

Black screen

Try pressing the 3rd button, as it toggles the Analog or Digital inputs...

Oct 05, 2006 | Dell 1703FPs 17" TFT LCD Flat Panel...

Not finding what you are looking for?
Kogi L7CH Monitor Logo

Related Topics:

119 people viewed this question

Ask a Question

Usually answered in minutes!

Top Kogi Computer Monitors Experts

William Miller
William Miller

Level 3 Expert

8795 Answers

Robert Schmidt

Level 1 Expert

37 Answers

Davor Krstevski
Davor Krstevski

Level 2 Expert

83 Answers

Are you a Kogi Computer Monitor Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides