Tip & How-To about Computers & Internet

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.



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.

Posted by on

Computers & Internet Logo

Related Topics:

Related Questions:

1 Answer

hp P6000 fans stop after 15 seconds. Hard drive light stays on. nothing on monitor


dead PC, DESKTOP PC ,as old as 2009.
the fans tells you the PSU shut off, for cause.
fans, so you saw all fans turn off or just 1. or 2 of 3.
my pc has 4 fans many have 3;
CPU fan stops ,cpu overheats , PC goes slow or dead. clean the lint off it.
GPU fan , video goes dead. if it overheats.
PSU fan is inside the PSU if it goes bad, PSU is bad.
no monitor stated, is it CRT or LCD is it 15 years old.
if the monitor is 2002 or newer the OSD screen works
even with PC turned off, press the select button see that OSD screen ? telling you the monitor is not dead in 1second flat;
i caN NOT understand why the HDD lamp glows,
if the PSU shuts off , most LEDs go dead, on my PC
the standby LED on the MOBO glows, unless you pull the PSU power cord.
your HP PC came with 9 different mobo, during its production run.
at least. so answers come harder from that reason.

here are some simple tests.
test 1
power on, hear fans run
does the DVD drive (or cd) button eject work,.?
do all fans not just 1 or 2 worK? look for all fans clean the lent out
or things will overheat,
PSU can be bench tested or in the PC case.
using a jumper wire, even the HP service manual covers that.

power on the PC (after keeping monitor on for 5 full minutes)
test 2
the Screen must say, "hit ESC key to enter HP setup" BIOS.
press the ESC key on the monitor
if no text shows up that is a dead PC< "text above missing{"
if the PC told you to hit another key do so.
The ESC key , activates the BIOS brain. this cause
all those pages to work as seen in your service manual;.
if BIOS is dead that is a bad PSU (monitor ok)
or CPU is overheated.
bad ram, take all sticks out and test 1 by 1, ask how. !
The PSU will shut down on up to 12 or more faults
but never shuts down the standby power bus. unless AC line pulled.
IF the PSU has fan as most do this is the first place I look.



try this guide
https://support.hp.com/us-en/document/bph06788

Jul 08, 2017 | HP Computers & Internet

1 Answer

nothing in the monitor


If you have a standalone monitor that you know works you can test out the laptop by connecting that monitor to the external VGA port that can typically be found on most laptops.
You may need to check your laptop function keys to see if you need to manually change the video output source before determining if this test works or does not.
The Video output key typically looks like either a monitor with an arrow coming out of it or two monitors side by side with a line between them. There are a variety of icons for this and it can be difficult to predict exactly what your specific model has.
If the external monitor does show an image than your laptop's monitor has gone bad. It is possible to replace this by locating an identical model laptop on sites such as ebay or craig's list (buyer beware) that has a working monitor, but some other component failed.
Seeing as your T41 laptop is an older model the cost of parts will be greater than the value of the laptop itself. I would suggest investing in a modern laptop instead of repairing your T41.

Aug 29, 2011 | IBM ThinkPad T41 Notebook

2 Answers

Monitor (viewsonic VP191b)is completely Dead. Is there a fuse?


There may be one, but it wont look like a normal fuse. It could be a surface mount type or one that looks like a resistor.

If I had your monitor on my bench, I would first replace all of the electrolytic caps on the circuit boards. These are typical fail points.

Aug 09, 2009 | ViewSonic VP191B-H-B3 (Black) Flat Panel...

1 Answer

I just got an acer zg5 and the screen is blank


It sounds like your trying to use a full size monitor with your laptop. If that's the case you have to send the video to the cabled monitor by pressing the "fn" (function key) and then pressing the corresponding key that refers to a secondary video device (i.e. projector, monitor, etc.). Typically you press "fn" and f4 (should have monitor looking picture next to it), Some laptops are different, so look at your function (F1 - F12) keys to see which one is correct.

Jan 14, 2009 | Acer Aspire 5100 Notebook

Not finding what you are looking for?

171 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Computers & Internet Experts

Doctor PC
Doctor PC

Level 3 Expert

7733 Answers

kakima

Level 3 Expert

102366 Answers

David Payne
David Payne

Level 3 Expert

14161 Answers

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

Answer questions

Loading...