TV Screen Goes Black Randomly – Power Light Still On. NOTE: Some troubleshooting steps may be different from your (Samsung, SONY, LG, Hisense, TCL, VIZIO) TV or remote control but generally will work the same to fix the problem. FIX TV SCREEN THAT RANDOMLY GOES BLACK.
Hey guys, I need help with my LCD TV. The problem started out of nowhere, with some sort of glitch.
The picture would flicker and make a noise as that of interference. Sometimes it would go back to normal, and some other times it just went black, but the sound was still there. I had to turn off the TV and back on to get the picture back. After having done some research on the net, I found that there was an easy way to check if the source of the problem was faulty inverters: I turned off the lights in the room and checked the screen with a flashlight at an angle. Bam, the images were there, so I'm guessing there's a faulty inverter, or maybe both of them. Now the thing is I can't seem to find the inverter boards when I remove the back cover:Could they be hidden behind the metal board???Any help will be greatly appreciated. Thanks in advance.
Click to expand.Yeah, I had found that too. In spanish and another in english (11MB), but unfortunately there's not much info. There's an exploded view, with numbers for each part, but then they forgot to write down what each number meant!
LOLHere's the service manual in spanish: (some parts were not translated from english to spanish though)Here's the service manual in english:In case anyone else comes looking for these. I saw some sites that were charging 20 bucks for these manuals, go figure. Click to expand.Cannot tell if everything has to be dismantled to pull the fluorescent tubes out in your particular unit, or there is provisions that allow replacement with some ease.Universal? At least you need to know lenght and thickness and how many.I would first try with some alike tubes connected to the inverter output before dismantling anything. If no light either, you save a lot of time and frustration, then focus somewhere else in the circuit.There is several on-line sellers of tubes at stupid high prices.I did once replaced the tubes with a string of surface mount white leds supplied with 12V from the inverter input and discarded the inverter.It is a lot of careful work, sweat and tears to mount the strip inside the U channel that hosted the tubes, then slides into its screen groove; but had the time and adrenaline. Will never burn out.Inverters are smart; they shut down if there is problem with the tubes and can mislead the troubleshooting.
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Just got a new PC with windows 7. ATI radeon 5850, 4 gigs ram, AMD phenom triple core.A couple days ago, the monitor (21' LG flatron, about a year old) starts going off for a second then coming back on, then maybe 15 seconds later off again. Sometimes more frequently, sometimes less. I unplugged the dvi cable from the monitor and back of PC, and now it won’t even come on again. The power lights work.So, I switched out this monitor for my 7 year old 19' viewsonic. The viewsonic works fine. No problems, so it’s not the computer.I connected the LG monitor to my second computer and it now also works fine.
Stays on.What could the problem be? Check the settings for frequency and resolution you are attempting to display at, specifically if it’s recognized as a generic plug and play.Flashing in and out is the attempt to sync signal.EDIT: You may even have an auto-sync button on the monitor that will attempt to resync with the PC, but chances are you are over-driving either the signal refresh or display size.I shut down the computer, hooked up the LG again, and now it’s been fine. I checked the refresh rate and I have ‘30 hz’ and ‘60 hz’ options. I seem to remember it was on 60 before, but now it’s on 30 after a reboot.
Maybe it didn’t like 60. I’ll leave it on 30 and see if it happens again.
It does show as ‘generic pnp’ under monitor settings.I do have an ‘auto set’ button on the monitor. Don’t know if that’s the same thing. I did try that while the problem was occuring, but it didn’t fix it. Ok that was weird yes, this is a really old post but hear me out.Also have an old LG monitor that worked fine until I plugged it into an old windows 7 desktop (only 4gb ram but i5 so worth playing about) - blink blink blink, at about five second intervals (steady).Tried the auto button as suggested above, didn’t work. Had briefly seen a mention of opening task manager somewhere else so tried that, didn’t work. In between blinks, was trying to close the task manager and try something else (don’t know what lol) and hit the maximise button instead.Got full screen - and the blinking immediately slowed, then, after about 30 seconds, stopped!!Obviously a soft not hardware problem, will try and install drivers and see if that fixes things. But as a workround, try alt+ctrl+del, then (in between blinks) double click on the top task manager bar to maximise.Might not work for everyone but another approach to try.