laptop lcd panel connector pinout in stock

This one is certainly a USB device - most of modern laptop touchscreens are - so most of the laptop webcam reuse tips will apply. I need to find VCC, D+, D- and GND. There"s 4 pins on the connector, so I don"t have to worry about pins like EN and RST being present - they are on some touchscreens, but not this one.

The connector receptacle isn"t something that I have a plug for when looking through my collection of random wire ends. This means I have to solder to the touchscreen board, sadly.

I didn"t have 1 and 2, so I had to resort to 3. Asus X200CA doesn"t have schematics available but there"s boardview files. With OpenBoardView and the FZ key, I was able to open the boardview file and browse it. Now, where do I find the touchscreen connector?

Sometimes the touchscreen cable is a separate cable, and sometimes it"s the same cable that also carries the display signals, and I need to know this to know which connector to look for touchscreen signals on. I looked up "x200ca cable" on eBay and found this:

Looks like exactly the cable we need, one connector (right) is the kind of connector that plugs into our touchscreen controller board, and another one (left) is a Molex connector often used in laptops. So, the touchscreen has a separate connector. I could look up an "Asus X200CA teardown" video on YouTube and see exactly where that wire goes, but I saved a bit of time by googling "X200CA motherboard" and looking at images:

The pinout, however, has to be determined. I usually take a multimeter, find GND, then VCC, then USB D+ and D- - as the latter are hard to tell apart, I try them in one polarity and swap them if they don"t work.

GND is likely to be at the screw hole - checking with a multimeter, there"s indeed connectivity between one of the pins on the 4-pin connector and the metal around the screw hole. It also is connected to all of the capacitors on the board, so that cements it, we found GND. I won"t solder a wire to the screw hole itself, but instead to one of the other GND points on the board.

VCC is very prominent on this board, it"s a thick trace going somewhere to the right from the connector. Even the connector"s mechanical pins are connected to VCC and not to GND, as usual - not that it matters this time.

Now, I just connect wires from my small microUSB+3.3V breakout board to the touchscreen, and, after swapping D+ and D- wires once (at the breakout, not at the connector), it works:

I touch the touchscreen (from its front size) and the mouse pointer of my laptop moves! Ain"t that nice. After fastening the wires a bit, I decide that I"ve successfully reused this touchscreen. Now it just needs a display fitted to it:

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Since all screens share the electrical connector (eDP 30-pin) and data protocol (2-lane), I thought all must be compatible, but apparently they are not.

What could be the reason of such incompatibility? Knowing the answer would help me find a proper replacement (not necessarily officially supported by the laptop vendor).

A while back I was sitting around and wondering what to do with my dead laptop. I knew the mother board was fried but everything else was still in working condition. As a result, I decided to make an external monitor from my dead laptop and proceeded to do the research to find out if this was possible. Below is what I discovered. Unfortunately, there was no way to use the motherboard"s VGA connector. The VGA connector on a laptop is used to connect to an external monitor. In any case the VGA connector is output only and wouldn"t work for an external screen. As a result, I found that I needed to buy a controller board for the LCD screen, to make it work as an external monitor. This was the main cost but was still less than half the cost of buying an external monitor.

Step one. Unplug the dead laptop from any power source AND remove the battery!. The laptop battery is located, usually, on the bottom and can be removed by sliding a release lever. These are lithium ion batteries and can hold a few Amps. The risk of shock might be minimal. However, there is no need to take the risk.

Step Two. To Remove the LCD screen from the laptop, you will need to remove the screws. There are rubber pads on the front of the LCD screen to protect it when the laptop lid is closed. Behind the rubber pads are the screws. Find and remove all the screws holding the front plastic frame on the laptop lid. Keep track of the pads and screws as you will need them to reassemble everything.

Step Three. Remove the plastic frame from the LCD screen. Here is where you need to be careful. The screws are not the only thing holding the plastic frame on the LCD screen! The plastic frame is snapped into place. Carefully pry loose the frame from the LCD screen. Pry it loose gently. Try to keep it as close as possible to the LCD panel while you are prying it loose because you may also find that you need to slide it to the left or right to completely remove it from the laptop. There is a small protrusion of the plastic frame where the hinge is. Because of this protrusion you need to slide the frame, in this case, to the right, to detach it from the laptop.

Step Four. Locate and remove the screws holding the LCD panel to the laptop. These are located on the bottom. The screws are attached to a small metal hinge. this is the component that is attached to the keyboard frame.

Next you will need to remove the LCD screen. Note that there is a cable attached. This is the LVDS cable. It is best to take apart the rest of the laptop and unplug it from the keyboard. However, the cable can be cut at the bottom. Take care not to cut the two wires going into the inverter (that"s the slim circuit board at the bottom.

Once the LCD panel is removed, you can remove the LVDS cable and unplug the inverter at the bottom. Unplug the inverter from both ends. Do not cut it. The LVDS cable is taped to the back of the LCD screen at the top. It is the flat cable running up the back. Remove the tape and slid the cable down. Since you need to buy an LCD controller board, you will no longer need the LVDS cable the laptop came with or the inverter. At this point you should just have an LCD screen with a pair of wires coming out of it.

Keep track of the plastic front frame and the plastic backing. You will need them to resemble the LCD screen. On the other hand, you have different fingers, just kidding. On the other hand, you can buy a picture frame and put the LCD screen in the picture frame.

Here is a picture of the LVDS cable and the inverter detached from the LCD screen. Since we will be buying an LCD control board these cables will not be needed again.

Next, once you have removed the LCD panel. Flip it over and look for a model number on the back. You will need this model number to order the correct LCD controller board. I went to E-Bay and found one for $42.00. I bought the LCD controller board and then received an email from the seller requesting the model number of the LCD screen and manufacturer. This is because each controller board is flashed, (programed to run a specific LCD) I gave him my model number, LP171WX2 A4K1 and told him it was made by LG Phillips. Since the board was coming from China, I received my order about 2 weeks later. Due note to buy one with a power cord! The LCD controller board has the VGA input connection which allows you to connect it to another computer and use it as a second monitor or as a back up in the event the one on your working computer goes out.

The LCD controller board is real easy to connect. It comes with all the required cables, except a VGA cable which you will need, in order to connect your LCD to another computer. You can buy a VGA cable from Best Buy or a computer parts store.

The LCD control Bard comes with all the cables except the VGA cable which you will have to buy. Once you have received your kit, proceed to connect it to the LCD screen. Plug the LVDS cable into the LCD panel where you removed the original from. The two wires at the bottom of the LCD screen that were connected to the inverter need to be unplugged from the old inverter and plugged into the new inverter below. Then, plug the power in. Make sure that the LCD control board is not sitting on anything conductive, like metal or it will short and fry. Next connect the VGA cable to the LCD control board and plug the other end of the VGA cable to another computer. Make sure the computer is on before you plug in the VGA cable. At this point you should have the same image that is on the computer you plugged the VGA cable into, on the LCD panel.

Next, I attached a 4 inch section of two by four on the outside back of the laptop lid. I needed this in order to attach my stand to the LCD screen. I used 5 screws and screwed them in place from the inside. I did splice and extend the cables going from the LCD controller to the inverter it came with just to have a little more room.

Originally, I built a nice wooden stand for my LCD panel but was not satisfied with it. So, I took a broken florescent desk lamp and dremeled off the section holding the florescent tubes, leaving enough metal to screw on to the two by four on the laptop lid. Before attaching the stand, I drilled four holes in the metal to make it easier to screw it on the two by four.

Next you will need to attach the LCD controller to the laptop lid. To do this, screw in a few sections of wood from the inside of the lid. Then on the outside of the lid attach the LCD control board. Place the wood in an area where the control board can reach.

Next you will need to find all those screws you have been saving and reassemble the LCD screen. I also added some surgical tubing to the top springs for added strength.

By the way a store bought swing arm half the size of this one, I found, cost around $400.00. If you choose to use a swing arm like this one, go with the one that has a magnifier on it and dremel off the magnifier leaving enough metal to attach to your LCD lid. You need one of this caliber to hold the LCD screen. Swing arms with the light attached are not strong enough.

By the way, I did remove the web cam from the laptop lid, wired it to a USB cable, and turned it into and external peripheral. I wired the two microphones that I found next to the web cam and  turned them into external peripherals. I dremeled the batteries open and wired them into a 3 million candle power flashlight made from spare parts I had. I have a lithium ion battery charger, so it worked great.

Since I was asked about the web cam, I though Should add it to the instructable. There is a nice instructable here at this site showing how to convert a web cam from an LCD screen: http://rntmns.com/2011/02/rebirth-of-a-webcam/

Mine works great on my Vista laptop. If you want to use it for checking plumbing pipes, I suppose you can put a small prism on the web cam aperture so you can insert the web cam in a pipe and view images directly ahead--this would be good for archaeology where you need to investigate tight spaces.

I"m so glad I found this... I have a nearly identical HP laptop that you used and recently noticed that it was overheating and too much work to fix up, but the big beautiful display works great and I was sadly thinking I"d be better off selling it rather than dissecting the entire thing to fix its overheating issue.

Actually, you can do One better. You can salvage the RAM, the Wireless card, the Batteries, the charger, the hard drive, the DVD disk player and sell them to people that need them on E-bay and Still keep the LCD screen for yourself.

Thanks for this instructable. I recently came upon some discarded laptops with either had bad screens or nonfunctioning everything else. I may be able to mix and match to get a usable machine out of the pile of junk!0

I checked ebay for the LCD control Board and all I did was punch in " LCD control Board for a LP154W01(A3)" , That"s my model number. You, of course, use your"s. ebay came up with the correct one for $25.00 and it has all the imputs you could want. This is good today, 2/11/19. Have fun folks!

i have a similar lcd panel to yours. infact 3 of them! they"re so easy to work with and doesn"t need a backlight controller LP154WH4 TLA1 except the lvds cable sold separately. I"ve build one and runs on

Nicely done and very informative!! However unfortunately, by the time you add the cost of the LCD Controller card, various parts and time you could have bought a new inexpensive monitor.

it really depends on what kind of display your laptop came with. I recently had a laptop that featured a 4k OLED screen and If I add the price up of the controller kit and materials (depending how you are going to make the stand) it would actually in my case be cheaper to make that an external monitor because, quite frankly 4k is pretty expensive and I don"t want to degrade to a lower resolution. in said laptop the motherboard died so I just scavenged everything including the LCD which I have just lying on my desk. so I might even consider trying this.0

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I found a much cheaper monitor. This one looks good and hopefully I can cut off a bit of that 4.8cm depth before mounting on the laptop. But can I just connect the TV to the battery + a switch?

12. In the event where devices have sustained damage to the LCD screens, covers, lenses or touchscreens which have the probability to disintegrate during disassembly and will therefore not be returnable in the condition that the device was received, the customer accordingly indemnifies and holds Asetos Computers harmless against all damage/s, harm and loss howsoever arising with reference to the aforementioned.

Perhaps if no one else answers, since you have to replace the LCD screen then maybe just disconnect the cable from the LCD screen end only and connect the new screen to it.