How to Dismantle a CRT Monitor





Introduction: How to Dismantle a CRT Monitor

Have an old or useless CRT monitor or TV your considering to throw out?

Well, before doing that, you might want to consider salvaging the onboard components such as the transistors, heatsinks, resistors, capacitors and especially the flyback transformer for later cool projects.

The goal here is to keep the tubes out of the landfills because they contain large amounts of lead and phosphor, and stuff you really don't want to pollute the environment which may seep into the underground water supply.

Taking apart a TV or a monitor may sound easy, but it can be very dangerous if you don't practice safety procedures.

You can also see a slightly different tutorial on my website

In this instuctabe, I'll show you how I dismantled two CRT monitors.

Step 1: Materials

Taking apart the TV or monitor can be very dangerous. High voltage may remain stored inside the tube even after being unplugged for a few years. Be careful not to drop the CRT. You could get seriously injured or die if mishandled. I am NOT responsible for any injuries you may receive for failing to adhere to proper safety procedures.

Having said that, lets begin.

For this task, all I used were:

-  a pair of rubber gloves
-  two cutting pliers
-  a Phillips screwdriver, and
-  a Flathead screwdriver
-  a safety goggles


These are the tools you will need for your typical disassembly, but may vary according to the types of fasteners used. Wearing your safety goggles is important to prevent eye injury or blindness in case of an implosion of the tube.

Step 2: Remove the Screws Holding the Case Together

Remove the screws holding the back on.

You should also also check for plastic tabs usually located on the top in between the seam and at the sides or bottom.

The top tabs were particularly tricky to unhook, but were eventually popped opened.

Sometimes the screws can be truly hidden, and takes a while to find. Some may behind small plastic doors and others may be hidden behind stickers.

Step 3: Slide the Case Off

Once you have removed the all fasteners, you can slide the case off. At this stage, its best to place the tube on its face. It makes the disassembly process much easier.

Since the CRT may still hold a lethal charge, I recommend that you put on your insulated gloves for the next steps and don't touch high voltage components for safety purposes.

Step 4: Discharging the CRT

To do this, you will need to ground the wire that is under the suction cup that is on the side of the tube.

Connect the flat-head screwdriver to a piece of wire whether by wrapping it around the screwdriver or by a alligator clip and connect the other end to ground.

For example, a metal rod sticking from the ground provides a conducting path to the earth.

Gently insert the flat head screwdriver under the suction cup.

Continue inserting it until it touches the metal conductor and you should hear a ZAP! if the tube still contain a charge. At this point the CRT is discharged.

Continue to pry of the connector until it is removed.

Now that the connector is removed, you can proceed to the next step.

Step 5: Cut the Ground Wires From the Tube

In order to separate the circuit board from the tube and the casing, you need to cut off all the ground wires from the around the tube. Here is an example shown above.

You should also remove the springs attached to the wire which may come in handy for later use.

Step 6: Remove the Main Circuit Board

On this monitor, to remove the circuit board, two tabs under the bottom must be first be unlatched before the metal base with the circuit board can be removed.

With the tabs released, the circuit board can now be moved freely.

Unplug any electrical connectors that are connected to the main circuit board.

Once the main circuit board is free to move from the main assembly, the rest of the connectors are revealed.

Unplug the quick connectors and cut the remaining soldered wires close to the circuit board so that the wires are more useful later.

The last set of wires are attached the the smaller circuit board, so cut them off from that end.

Once all the wires are removed, the main circuit board can be removed.

Take special care not to damage the circuit board because you will desolder the onboard components later.

Step 7: Remove the Smaller Circuit Board

The next step is to remove the small circuit board attached to the tube. It is normally held on by a strong adhesive at the base of the CRT connector.

Just take a flat head screwdriver and pry in between the seam of the tube connector and the tube until it comes apart.

The glue was the only thing holding the circuit board fixed to the glass tube's base.

Step 8: Stripping the Neck

Since I intend to strip out everything from the monitor leaving only the tube and the casing, that meant I had to remove the stuff from the tube's neck as well.

You should prevent from breaking the tube because sometimes breaking the tube, means it can't be recycled once your done.

So take care when handling this part of the disassembly.

To begin taking the stuff off, there is usually one or two clamps that must be loosened first. Loosen the clamps and carefully remove the spacers from around the neck. These are all the spacers removed from the neck of the tube and one of the two metal clamps.

Once the spacers and other obstructions are moved out of the way, the steering coils can come off.

To do so, first pry off the four insulated cushions at the base of the coils and then the coils should be free to slip off.

Step 9: Putting the Case Back Together

At this stage, the casing is put back together. The tube was not removed from the casing because it's a lot safer and prevents the neck from accidentally breaking off.

Now you can take the CRT to a recycling facility. Keeping the CRT out of the landfill is the objective here.

As mentioned before, you don't want the toxic substances such as lead to seep into the earth which may contaminate underground water supplies.

If you followed all the steps closely, then you will have a similar compilation of parts shown above.

Please note that I also spared the monitor's swivel base that may be of great use on a later project.

Of coarse, your final compilation will vary depending on make and model and whether it is a TV or computer monitor.

I hope you have found this tutorial useful.

Here are some links to my other instructables:

How to make a Utility Bill Organizer

Reviving an Electric Shear

Fragrant Flowers Vase

Fine Mist Spray Bottle

Pencil Holder


Case Safe



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    Well I have some lil diff problem...what it is that I got a 17" Crt samsung Syncmaster793s monitor which acts as a display for my old P4 2.8 GHz PC. Now the back board of it somehow got loose so creating color when you off a single RGB signal line bt if you rake the back circuit board a lil it comes back the joint got somewhat pins at joint not making full contact.

    How to correct it?

    I mean I wud have to remove that glued board and reattach it to do it safely....and wud fevi quick will do the job? I mean putting it back in place :)

    Do you know if it's in the tube part, or the circuit board that holds the charge when you discharge it? I didn't hear a zap when I did that step but i didn't want to take any chances so I clipped the wire and just left the suction thing on the tube. It's a really old tv and it crumbled when I picked it up so I wanted to shed all the unnecessary parts for when I bring it to be recycled. The tube has been unplugged for over 10 years now so it might not even have a charge anymore.

    The charge is in the tube. Newer CRTs I believe have bleeder resistors built in, which slowly discharge it over time.

    Also, if you didn't hear a zap, removing the suction cup and cutting it would do the exact same thing.

    I was disassembling old tv and didn't know how to do few things, but now i know :P Thank you! It was very helpfull :)

    I have dismantled my old CRT monitor and now I have no idea how to dispose the Tube itself. [kids usualy trow rocks at them, when they find one laying on the road side, just to hear the BOOM!]

    The charge is between the out side of the CRT and the inside surface and the whole thing is floating above earth ground. If the ground in the monitor or tv is not hooked to the earth ground then it will not discharge all the way. To get full discharge run a third wire from clamp / screwdriver and the chassis ground.

    Nice Instructable! CRTs are gold mines when it comes to salvaging parts :)

    I have a question for you, as I don't know much about electronics. When removing an older (2000) large Sony Trinitron CRT tv to make room for my son's new flat screen tv in the playroom, the big old tv was dropped, cracking the plastic housing (as far as I can see). The screen is still intact. I was not home at the time of the incident, but the man moving the tv said he did not hear an explosion noise. I had the tv removed as soon as I read how toxic tv materials can be (it was in the playroom for about 6 hours after the drop), but I'm now concerned about potentially hazardous materials in my house. If the screen is not broken, and I saw no traces of broken glass anywhere (only a crack in the plastic near the speaker), can I assume that the CRT is also intact? Should I be concerned about toxic or radioactive materials leaking out with no external evidence?

    There should be no cause for concern because the harmful materials are applied as a coating on the inside surface of the CRT. If the glass is not broken, then there should be no leakage. The glass is very thick and is relatively hard to break.