Register to reply

TV CRT Safety

by AcidRainLiTE
Tags: safety
Share this thread:
Dec23-08, 02:43 AM
P: 84
I recently disassembled my Big Screen CRT projection tv. I have been well aware of the danger of the capacitors in CRT TV's and I managed to take the TV apart and remove the capacitors all without killing myself. However, I was doing some more reading online and it seems there is another danger: the phosphors on the screen and the lead in the CRT glass. I assume the lead is not a problem unless the tube implodes and pieces get embedded in your skin, correct? My main question is about the phosphors. It is only a problem if you actually touch the phosphors right? I did not touch them, but I tried to remove the glass that was covering them, and was thus working around them. What I did was the following: First I removed the 3 lenses (there are 3 separate CRT's [one for each color--red,blue,green] and there is a lens on top of each of them), then I was curious about what was behind the lenses. I saw that there was a piece of curved glass in front of the phosphor screen and so I proceeded to take it off (i.e. remove the screws that were sealing it on), I wiggled it around a little trying to get it off and managed to pull the thing up a little but I couldn't get it entirely off. I got a very strong feeling that I should not be trying to remove it and so I gave up. I never actually touched the screen, though I am a little worried since I pulled back the piece of glass that covers it. So, I am just double checking, is there anything to be worried about (other than the fact that the three CRT tubes sitting on my bed are essentially bombs waiting to implode)?

Phys.Org News Partner Engineering news on
A spray-on light show on four wheels: Darkside Scientific
Research project on accident-avoiding vehicle concluded
Smaller artificial magnetic conductors allow for more compact antenna hardware
Dec23-08, 03:50 AM
PF Gold
Danger's Avatar
P: 8,964
If it's any sort of respiratory or radiation hazard that you're worried about, relax. Neither exists. The phosphors would probably cause some damage it they got into your bloodstream, but are otherwise harmless. I'd be a lot more concerned about flying glass.
Regardless, they should be treated with the utmost respect.
There are medical specialists here that can tune you in better than I can.
Dec23-08, 09:12 PM
P: 84
Thanks for the reply.
Yeah, the only reason I was worried was because this site made it sound like the world would come to an end if I came into contact with the phosphors:
"NEVER touch a CRT’s phosphor coating; it is extremely toxic. If you break a CRT, clean up the glass fragments very carefully. If you touch the phosphor, seek medical attention immediately" --

Proton Soup
Dec23-08, 09:36 PM
P: 1,070
TV CRT Safety

wikipedia has a lot on this. not much lead is likely to leach from the glass. the cadmium and barium seem toxic. i'd just make sure not to breathe dust from a broken tube or lick the shards.
Dec24-08, 11:17 AM
berkeman's Avatar
P: 41,258
Also, since the lead is toxic, you are generally required to recycle the CRT, rather than just throw it (them) in the trash. Please find a recycler near you that can accept CRTs. And yes, please be careful handling them. If you get a residual shock from the anode button and drop one, it would be very bad.
Proton Soup
Dec24-08, 03:14 PM
P: 1,070
why do people freak out about lead? eating paint chips is one thing, but the solubility is pretty low. our waterways are full of lead shot from fishermen.

Register to reply

Related Discussions
Car safety experiment Introductory Physics Homework 4
Factor of safety Engineering, Comp Sci, & Technology Homework 10
Americium and safety. Nuclear Engineering 4
Eye safety with lasers General Physics 13
CO2 safety General Physics 4