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Re: Clarity bobcat monitor, no picture black screen
This is a generic symptom that could happen to any LCD
The following is a generic answer applicable to most.
Two possible causes are bad capacitors or a bad light inside
the LCD panel.
Open the unit and check to see if any of the capacitors in the power supply or
other boards look domed or vented on the top.
Replace any capacitors accordingly. Use the same value capacitors. Most often,
1000uF 16V or 25V, 470uF at 16 or 25V, 220uF at 16V or 25V.
If this doesn’t solve the problem, try checking the surface-mount transistors
on the inverter board that run the lights. Some times these transistors go bad.
Check the area for any cracked or overheated ceramic or mylar capacitors.
Also, you may have a bad light inside the panel. This is
tough to test without a spare light to use for troubleshooting.
You can take the panel apart and inspect the lamps but it is very tedious. It's
tough enough to get them apart and back together again never mind keeping the
layers clean. You have to try not to get any dust between the layers or you
will see it in the picture.
There are usually two light fixtures each of which holds two lamps. One fixture
is at the top and one at the bottom. Remove them one at a time and inspect the
lamps to see if any are broken or very dark on the ends. If one looks out of
place, it could be bad.
You'll have to find replacement lights on the net. It's not easy to replace
them, but if you've gone this far, good luck. You should be able to get generic
instructions off of the site that sells the lamps.
a 6ya expert can help you resolve that issue over the phone in a minute or two.
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Black screens or no pictures are usually caused by a failure in the back light power supply. Many times the monitor is working but with the back lights not turning on you can't see the display. Here is a link to a repair guide that will show you how to open the unit and what to look for and replace to rebuild the power supply and bring the unit back to life.
coolvegasmik, Sorry, to hear that your "cold cathode-fluorescent-lamp-back-lit-lcd-monitor" is not working. Did you hold and point a bright flashlight 1 inch from the lcd panel when it went to "black-screen"??? Did you see any icons on the "black-screen"?? Software NOT a fix for this "black screen of death" problem. You or electronics technician will need to open L91A and look for bad capacitors or bad soldering on the power supply printed circuit board. If unit is 4 to 6yrs old, just trade-in for new wide screen unit. See video clips of swollen bad capacitors at YOUTUBE when you search "lcd monitor repair". All lcd monitors (99%) use same basic design and principle of operation. Sometimes ccfl back-lit lcd monitors can be repaired for less than $6 in parts and monitor will work for 1 to 3 more years. 12fixlouie
Hi! When a monitor display image for a second and then goes to black screen... there are possible reasons why this problem
1. You need to check if the high voltage ballast
transformer of your backlight inverter is about to be burned... the
transformer is overheating..that's why you experience the monitor
working for a couple of seconds and then it will shut off until the
transformer cool down again and then it will be ready to work again...
2. Check also the backlight inverter if it is busted...the backlight inverter is the light source responsible for the image display you seen on your screen. If this are busted then all that you will be seeing is black screen
You need to check the power supply section for possible loose
connections and possible blown and bad capacitors..
the ballast transformer has direct
effect on power supply section.. when there is overheating
transformer,,, the supply current from the power supply section becomes
unstable.. and will not be able to supply the remaining good working
In case you do not know, the ballast
transformer generates high voltage for the backlight inverter to
Please be advise that if
you don't have the knowledge, the proper skills and the right tools to
open the back cover of your monitor and replace its part...don't risk
Otherwise, bring your unit to a credible technician and avail of warranty if there is any.....
Much appreciated if you rate this help...thanks...
victorash02, Is screen black n blank, or just black? Do flashlight test! Yes it could be both! Most likely problem with unit's internal "switch-mode-power-supply"/"CCFL inverter supply". You or technician will need to investigate for probable cause of black screen of death. Need a little history of unit! Did it work just fine 2 weeks ago? How many "ON" hours of use on the unit? When was it made? Did you PROVE that PC not cause and works ok? Get back here with more info so we can help.
12fixlouie on fixya. Read my fixya profile for a little while.
bonannorl, Maybe it can be fixed. You did not give any history of unit. Only "now" stuff. Is unit covered by Gateway warranty? How old is unit? Date of manufacture? Did unit work fine connected to your pc and this black or black n blank screen thing suddenly happen? Is screen also BLANK? Have you swapped-in old monitor to prove PC is OK? Your CCFL back-lit lcd monitor no different than any other brand in it's basic design and operation. Get into my fixya profile and read some of my testimonials and solutions to black or black n blank screen problems to help in your decision to DIY fix or contract out needed repair work. Most likely 2485w has problem with it's internal "switch-mode-power-supply"/"ccfl inverter supply"!! Let me know more info about unit.
12fixlouie on fixya.
mrmadgbull, How long will e17tg display the WIN-desktop before it goes to BLACK screen? Is it 1, 2 ...4, 5.....20 seconds? How old is unit? Does unit have internal ac to dc SMPS or external (lay on floor) SMPS? Did problem occur suddenly? What do you see on screen after "it" goes black and you shine a bright flashlight 1 inch from screen? Can you still see some icons being faintly displayed?? Is unit out of it's warranty period? If lcd panel is both black and blank, "switch-mode-power-supply" could be in full shutdown mode. If you see desktop, SMPS is in partial shutdown mode. You or electronics technician will need to evaluate and repair unit. Read my FIXYA profile for more options you may have open to you. Your monitor no different than any other "cold-cathode-fluorescent-lamp" backlit LCD monitor. There is a lot of DIY videos on YOUTUBE that deal with this type of monitor problem. Lots of tech types pick-up "black screen" lcd monitors at resale shops and refurbish them for less than $20 total cost, and they will work for another 2 -4 years. Do your research before making hasty decisions. If pocket is deep with disposable income, then just use e17tg as trade-in for new wide screen. Hope this was of some help. 12fixlouie
Disconnect the unit from the computer.
Disconnect from power source.
Let the unit sit for a few minutes.
Plug the unit into the power outlet.
Push in the power button and if you get a message on the screen that says " No Signal " The monitor works fine.
Next, plug the unit into the computer port.
If you do not see a image or a signal, you may need to reseat the vedio card inside the computer.
There is probably a bad capacitor within the monitor that will not allow the picture to "hold" in the on configuration. This will need to be replaced. You can send it back to Phillips, or 17" monitors are pretty cheap these days. I would suggest a Samsung or BenQ. They both carry 3yr warranties.