Warning

mascherano

Welcome to the GCSE physics thread.

rmg1

Oooh, goody - I didn't do too well in Physics!!

FallingDownMan

I do like it when people who don't understand stuff start talking about it to justify an incorrect statement

You CAN get electrocuted by a monitor if you open it. Period.

The capacitors inside CAN hold their charge for months or years. Period.

People who are NOT qualified to open them up shouldn't. Period.

People who aren't qualified to open them up, but who advise others it's OK to do it, shouldn't. Period.

superscaper

FallingDownMan wrote: »

I do like it when people who don't understand stuff start talking about it to justify an incorrect statement

You CAN get electrocuted by a monitor if you open it. Period.

The capacitors inside CAN hold their charge for months or years. Period.

People who are NOT qualified to open them up shouldn't. Period.

People who aren't qualified to open them up, but who advise others it's OK to do it, shouldn't. Period.

I've only skimmed the thread again but I can't find what you're actually disputing so which posts are you talking about? Why are you writing "period" and not "full stop"?

FallingDownMan

It was for the guy who reckons it's safe to go inside HV gear and that suggesting otherwise is scaremongering.

ollyk

tomsolomon wrote: »

The capacitors in a PSU arent anywhere near the size of what you would find in a television or monitor, but still worth steering clear of.
Some of the tv and monitor capacitors are well capable of dismembering your digits.

I am sorry but this is not strictly true!!!

The computer contains a Switch Mode Power Supply SMPSU and is very similar if not effectivly identical (for this argument) to the PSU in a telly. Ok, a telly contains upto 30,000 volts to the tube but generally cannot supply a great deal of current and is VERY WELL INSULATED however A SMPSU (in computer and telly) contains 400VDC rectified straight from the mains and quite a healthy supply of current if I was condemned to death and had a choice to touch the 30kv of a telly or the 400V of the SMPSU I would choose the SMPSU for the quick option.
Now when the computer psu is disconected from the mains the main capacitor is shunted with a resistor which is designed to discharge the capacitor to safe levels but should this resistor fail then you will be left with a capacitor that might be holding near to it's full capacity and hence QUITE LETHAL!!!
To give an idea when shorting the capacitor with a screwdriver it will happily weld the solder pads and perhaps even the driver but will only spark (although big sparks ) when shorting a telly tube does that tell you something?
remember it is the volts that jolt, but the mills that kill!

So unless you are trained or confident just stay well clear!

ollyk

tomsolomon wrote: »

TV's and CRTs are capable of holding a charge of around 30,000 volts thats thirty thousand. You get hit by that its lights out. And the charge in these capacitors has been known to stay in there for up to six months or more.
We have a proper Fully qualified CRT repair technician at college and he wont even touch them unless you hold a gun to his head. He would rather throw them out and buy new.
You could almost say that being a CRT or TV repair technician is not to dissimilar to being a bomb disposal expert. Thats why there are big yellow stickers all over the back of some electrical diposables.

Sorry but either you or your technician is talking from where the sun don't shine...

6 months and why throw something out that might be serviced perfectly safely for a few pence? bomb disposal expert? :rotfl:

There really is a lot of crap and miss-information on these forums tonight!!!

FTD

Quite a lively thread...
Like someone already mentioned, I Suppose it's all down to your level of risk!

Who lights the cooker with a naked flame when the cooker could have been leaking gas all day? .... Who gets out of the shower and turns the light switch on or off whilst wet? Who dodges traffic to run across the road to buy their smokes from the paper shop in the morning? Who goes out alone at night when they could be mugged/raped/murdered? Who's brave enough to actually walk out in the open in broad daylight when a falling satellite or meteorite could hit them on the bonce, or the ground could open up in a huge orrible explosion of red and green gas and spew and Satan could jump out and carry you off into the depths of hell???
Each one having a potentially negative impact on your general well being.

Me, i'd open up a dead PSU to replace a blown 5p fuse before I binned it and bought a new one!!!

If yer scared of gettin a leccy shock wear a pair of marigolds!

FTD

rmg1

FTD wrote: »

Who gets out of the shower and turns the light switch on or off whilst wet?

ME!!!
All light switches in bathrooms have to be pull type by law.