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I have a lcd 195vxm hooked up to a laptop because the laptop screen failed. It has been working fine for several months, but now it comes on and says "video signal 1 dsub no signal". That is the same message it has always said, but now it just goes back into standby mode (yellow light on power button) and won't stay in active mode. I have rebooted, unplugged for a few minutes, but it hasn't helped.

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Go to safe mode and decrease the screen resolution,

if still doesn't help go to safe mode again then go to system restore under system tools, restore back to early good restor point

Posted on Nov 15, 2008

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I have a dual display with a Samsung digital LCD flatscreen and LG analog LCD flatscreen running on WinXP with a nVidia GeForce 8400GS video card. The video card is new - the old card (which was hooked up...


Hi

I'm not sure what you mean by VGI. I will assume you mean VGA (Analogue - D Shaped with 15 pinholes).

When pixels or line of lixels fail on a monitor, they usually fail in spots or in a vertical lines due to the design of the matrix.

Since both monitors are sharing a single cable and the graphics card is a new one, the fault automatically isolates itself to either the monitor or its VGA connector.

Check that none of the pins in the end that connects to the faulty monitor are bent and/or touching one another and shorting.

Then try changing the resolution of the graphics card itself and test the monitor's performance at various settings to see if the resolution seeting is straining against the limits of the monitors range.

Right click on open space in the desktop > properties > settings > click and hold the slider scale step by step, up and down the scaled to test the monitor > apply > ok > test for a reasonable period > reset.

Also test the monitor with a single VGA cable to another computer (even a laptop, using the Fn key + external monitor function key).

Thses tests should tell you if the monitor is failing.

I hope this helps.

Aug 24, 2011 | PC Desktops

Tip

Monitor LCD Screen Replacement With A Laptop Screen


This tip is for the typical PC tech with a shop full of dead laptops and monitors, looking to make an extra Monitor for bench testing malfunctioning PC's. Maybe you're a tinkerer and just have some spare parts laying around, and want to make something cool and easy. Either way, this tip is a fun way to make old dead parts work for you, rather than sitting in a corner gathering dust.

Replacing a Laptop screen is pretty easy if you take it slow.
LCD Monitor screens are actually easy to replace too, if you are careful not to crack anything getting one out and in again.

This tip doesn't address any of the typical replacement methods.
What this does is show you how to use a laptop screen in a standard Desktop LCD monitor.

Having already disassembled your Desktop monitor, and determining that one or both of your backlights is dead, you will most likely begin searching for sources of a new one. Before you do that, try testing both backlights in the dead monitor screen first by hooking them, one at a time to an inverter in a working laptop to verify that both are dead.

Most of the time, you will discover that only one light is dead, and this is where the fun begins.

At this point, you have a few choices to make.

1. Extract a working backlight from a cracked LCD, we all have a few of those lying around somewhere in just about any PC tech area.
2. With the extracted backlight in hand and the old LCD screen still attached to the monitors electronics, remove either of the sets of wires going to one of your backlights, leaving one still attached.
3. Now you can attach the light you extracted to the empty socket your original screens light attached to, while leaving the other one still attached.
4, Now, turn on the monitor and wait for the extracted backlight to come on, if it doesn't switch it with the other light socket plugged to your screen, and plug the opposite light wire back in.

This will do 2 things for you. First, it will be a quick test of your inverter, and second it will verify that you do or don't have at least one working backlight still functioning in your monitor.

Remember that with most LCD monitors, just one backlight can provide enough illumination for your screen to show a very crisp picture.
The problem appears though, when we decide that our existing LCD is dead because we dont see it light up.

The solution for this is to simply disconnect the dead light wire from the existing inverter plug leading to the LCD screen, then replacing that with a working light from the cracked screen without disassembling the LCD screen itself. If you did everything right, your old dead screen will be working as it should. Be sure you swap the backlight connecting wires so that your Bright/Dim controls work as they did before.

You see, most dual light inverters work the same as a standard twin tube household flourescent light. When one goes out, they both eventually stop working. So, adding that second light completes the circuit, then swapping light socket connectors turns your backup light tube into the primary light, instead of the secondary.

Now, if THAT trick didn't work, you can move on to the Laptop LCD trick, which is pretty much what you did before, except that the Laptop LCD usually only has 1 light tube. So for this to work, you can complete the lighting circuit by simply adding your spare backlight tube to the second open backlight connector, then installing the LCD to your monitor.

Many of these Laptop LCD screens are the same height and width as comparable Desktop screens, but they are also thinner, and will have to be glued or taped to the frame from the inside. Everything else connects exactly as the original screen, but may need to have wire added to the Laptop backlight wire so it reaches the power source.

I figured this tip was worth posting, since I just did this trick with a 15" polaroid HDTV/HDMI/HiDef Television/Monitor combo.
The model I have died a few months after it was bought new from Walmart, and the customer just didn't feel like paying $129 for a new screen.
Being the packrat I am, I just couldn't bear throwing it away, figuring that some day I would find a matching screen. As you can see, I got tired of waiting. The pictures of my project are below.

dc79966.jpg2e21d78.jpg

That bright line of light isn't the flash from my Camera, it's the flourescent light tube from a broken LCD screen placed on top of the steel housing.
The incidental effect of that light is that my back wall is a nice nitelite, and hooking up new components is a lot easier. Yes I could have blacked it out, but I think I like the added light behind the TV.

I hope this Tip comes in handy for you.

Bob S.

on Apr 08, 2010 | PC Desktops

1 Answer

I have an HP G62-149WM laptop. After leaving it in a hot car in the sun I used it normally for 3 hours till the battery ran out. The next day I started it up and the screen was nearly totally dark. I could...


Thats interesting as thingsdon't usually come back. It could have been the backlight power supply or even the lcd itself. The lcd can be damaged by temps under freezing or over a 100F (38C) or so.

Unfortunetly there is probably nothing to find if you got it checked out so you would just be wasting money. Most techs replace or repair on a board level so if one of the resistors or capacitors has a problem they wouldn;t be able to find it.

Basically you should just run it until it actually fails then you can get it fixed fairly easily. If it is a backlight issue (power or light) or even lcd you can just hook it up to an external monitor to use it. Thats somewhat less annoying than using the flashlight ;-]

Sep 24, 2010 | PC Desktops

1 Answer

Screen turns blank all of sudden and works normal after switching of the system for 1 hr or so.


You could have a defective screen - a defective inverter or a CCFL lamp.
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:
  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display or appear black.
  • Picture flickering on and off.
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

May 12, 2009 | HP Compaq dx2250 Microtower - Get 3...

1 Answer

No power on laptop screen


Hello,
The first thing to try is to hook up an external monitor to the laptop.
If the external monitor works then it is either the LCD screen or the backlight for the LCD. If not then it is probably the video card inside the laptop.
Also check the "function" (Fn) key combinations on the keyboard, you might have shut the screen off with the Fn keys accidentally.
Hope this helps.

Apr 26, 2009 | Acer PC Desktops

1 Answer

PRINCETON LCD 19 IN MONITOR. WHEN TURNED ON SCREEN FLASHES OFF AND ON AND MAKES A NOISE EACH TIME IT FLASHES OFF AND ON. AFTER SEVERAL MINUTES STAYS ON AND WORKS FINE.


Sounds like there is a capacitor in the power supply section that is failing to charge/discharge correctly. Is it under MFG warranty? If so I would send it in for repair.

Oct 07, 2008 | PC Desktops

1 Answer

Gateway flat LCD dead


I'm not sure if your referring to the lcd monitor (gateway brand) or a laptop's lcd screen not working anymore.

1. if it's an lcd monitor...
a. test monitor in a different pc before assuming the problem is the lcd screen
b. replace the monitor if after testing monitor is in deed the item failing.

2. if it's the lcd screen from your gateway laptop.
a. you may be able to attach a regular analog monitor to the paralel port on your gateway.. test and see if the monitor that you attach will give you a picture (you may have to toggle with some some keys on your laptop keyboard to make have the signal going to the "externa" or attached monitor.
if the other monitor does not work either.. you video controller on your motherboard on your laptop may be failing and you may not have other options that to replace your laptop.
b. if the external/attached monitor works.. very likely the problem is the lcd screen for that you need to get a replacement and you may have to contact gateway to find out about pricing (or places to send your laptop for service if you're still within warranty). if you have an old laptop you may have to considere simply replacing the unit as buying a new lcd screen may very likely be more expensive than the same working laptop.

Oct 02, 2008 | PC Desktops

1 Answer

Ok got a laptop problem, for my acer aspire 3000, im sure its the lcd, i turn it on, sometimes it works fine, other times it doesnt,...


Unfortunately, you will probably have to open up the laptop, and check the seating of the cables inside both the base and the LCD. It sounds like a loose connection, or a broken wire. I had similar issues with a Dell laptop, and it turned out to be a wire going to the ccfl tube (The backlight) that was shorting out against the case of the laptop when moved. Also, just try to re-seat the connections, it sounds like you have already had it apart. The cables should come off easily, and go back on with ease too, but do not attempt if you are not experienced, or at least comfortable with this type of thing.

Apr 23, 2008 | PC Desktops

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