Insides of a CRT

mp3guy

Just took the case off an old CRT screen, need it for something, but is there anything I should do with the board/CRT? Is it ok to leave it somewhere untouched until I can dump it, or could it potentially implode or pollute my room with xradiation or something?

petes

How long has it been turned off?

ARGINITE

If it has been recently use the capactors used in the monitor could still be charged. This can be dangerous. so be careful where you put your hands.

Karoma

ARGINITE wrote:

... so be careful where you put your hands.

Deep.

mp3guy

Its been off for over 6 months

petes

mp3guy wrote:

Its been off for over 6 months

Safe then. As arginite said the capacitors can hold a charge for a time after it has been turned off.

ARGINITE

should be fine then.

Karoma wrote:

Originally Posted by ARGINITE
... so be careful where you put your hands.
Deep.

Yes deeeeeeeeeeeeeeeeeeeeep:D

tech

very high voltage in these be carefull

bushy...

The actual screen/tube itself also holds charge ,enough to wake you up / kill you depending...maybe ask watty or someone for more info

mp3guy

So its still lethal after 6 months?

ARGINITE

Most lightly not, but to be sure you can earth the screen by slipping an earthing cable under the ruber at the base of the screen and earthing it.**

** DANGEROUS IF YOU DONT KNOW WHAT YOU ARE DOING!!

Best thing to do is just dont touch it till you have a chance to dump it.

Sparky

As long as the capasitors have been discharged you should be ok, the inside of the screen is an evacuated tube (as electrons dont work well in dirty air) so take care not to damage it as its exposed. It may implode.
If you want, look for a small nipple at the back of the tube and break it with a pliers, you will hear a hissing sound, this is the air being sucked into the tube, so you know now that its just a glass tube.
So atleast keep it somewhere safe and cover it with a towel or something.

mp3guy

Sparky-s wrote:

As long as the capasitors have been discharged you should be ok, the inside of the screen is an evacuated tube (as electrons dont work well in dirty air) so take care not to damage it as its exposed. It may implode.
If you want, look for a small nipple at the back of the tube and break it with a pliers, you will hear a hissing sound, this is the air being sucked into the tube, so you know now that its just a glass tube.
So atleast keep it somewhere safe and cover it with a towel or something.

Hmm, how would I go about that? I looked around, and pulled off that red cable with the black rubber, and this was under it, so what next?

SirLemonhead

All Ive ever heard about them is that the capacitors can hold charge for years...could be a wild exaggeration though.

mp3guy

OK, I just found out the thing under than redcable/black rubber thing was not what I was looking for. Can someone guide me through what I'm ment to do here?

mp3guy

OK, I asked around a few other places and did it. Phew, that was sketchy. It hissed for about 4 seconds when I pierced it, and its a 15" screen, that normal?

Sparky

mp3guy wrote:

Hmm, how would I go about that? I looked around, and pulled off that red cable with the black rubber, and this was under it, so what next?

Actually dont bother

edit: maybe I should read above.
4 seconds sounds right, dont forget it was a evacuated of air, so a small pierce would let it take that long.

Sparky

MasterOfSolos wrote:

All Ive ever heard about them is that the capacitors can hold charge for years...could be a wild exaggeration though.

It is

Big capacitors can give a good shock, but id say the capacitors in a tv are in microfarads which would give you a good tingle.

Ishindar

that rubber cap with the cable attached which u removed is dangerous. There is two metal prongs under the cap which hold a large charge but unlikely to be dangerous after 6mths, its the o/p from the LOPT transformer.
The hole the rubber cap was attached too, inside this hole there is also a large charge but again probably safe after 6mths.