3 ms·
Dangerous to poke around inside when plugged in, but quite safe unplugged (unlike say an old TV).
by floren 4y ago
Dangerous to poke around inside when plugged in, but quite safe unplugged (unlike say an old TV).
- pyinstallwoes 4y agoWhy is an old tv unsafe?
- kenny11 4y agoThe CRT retains a high voltage charge even when the TV is unplugged.
- greenbit 4y agoThe CRT acts like a capacitor, storing charge for quite considerable lengths of time. Consider that a B&W would typically run 10kV to 15kV, and color sets easily 25kV, and that should give you some idea of how much energy one of those things can hold. And with those kinds of voltages, you don't even need to make contact to find you've become a discharge path, that stuff will reach out and grab you across considerable air gaps.
- dylan604 4y agooh, boy. the temptations of telling how to find out on your own are strong! the capacitors in CRTs could store a charge for a long time. i've seen people that assumed the caps were discharged find out the hard way when they shorted the leads with a tool. the noise alone is enough to make one need clean shorts. the only good thing is that they discharge quickly, but they give you "both barrels" worth to borrow a phrase.
- 1970-01-01 4y agoCRTs hold a deadly charge for minutes to hours after being unplugged. CRTs can also emit x-rays if you bypass safety circuits. And touching a live flyback would be shaking hands with death. They were also manufactured before RoHS, so don't lick the PCBs or throw them in the ocean. Other than that, they're perfectly safe.
- 123pie123 4y agoDO NOT ASSUME a CRT MONITOR or 'old' TV IS SAFE to poke around when unplugged!!!!!! https://www.instructables.com/How-to-take-apart-TV/ https://www.instructables.com/How-to-take-apart-TV/
- floren 4y agoRead what I wrote again carefully, paying extra attention to the word "unlike"
- 123pie123 4y ago"but quite safe unplugged" a CRT monitor is typically (I would not gamble on it - again!) not safe when unplugged
- dekhn 4y agoyes, you two are in agreement. it's the radio receiver that's safe when unplugged.
- gumboza 4y agoNot necessarily. The main filter caps can retain a high voltage depending on how it’s wired and if the designers installed a bleeder resistor and if the production guys didn’t remove it to save a few cents.
- II2II 4y agoUnlike means not like, so they were effectively saying it was safe to go inside radios but it is not safe to go into old televisions.
- 123pie123 4y agoappologies - I just re-read the article (and the other comments). I see where you're coming from I just saw the words "unplugged" and remembered the word vacuum tube - then massive emotions from my past came rushing through
- aidenn0 4y agoMy dad used to repair TVs; I asked him what the easiest way to discharge a tube was and he said "grab the anode lead and the chassis" then after I gave him a look he said "well you didn't ask for the easiest safe way to discharge one"