Thread: inverter voltage

Generally, the output (You mean the other end of the transformer?)
is approx. 1500V/40kHz at ignition of the CCFL and around 600-800V* in normal running. You can not measure it by a simple multimeter and also not recommended, because the risk of electric shock!!!!
Try to measure the current of the backlight unit instead. It must be around
1A or so. When it is just some milliamperes, the switching transistors are out or the controller chip does not provide rhythm. When the current is zero, fuse problem....

*This voltage varies with the lenght of the lamp. Longer is higher.
CCFL=Cold Cathode Fluorescent Lamp

I was wondering about that. 700V and several watts should be leathal. Is it, or does the high frequency not penetrate to the heart?

Tolasssss-> Try to find a ready made unit.

It causes a dangerous electric shock, but it is not lethal.
I think it does not reach the heart, because this usually happenned to your fingers. The distance is not enough. Besides, this AC freq. likes surfaces better than deep tissues...

Originally Posted by DarquePervert

I do believe that you are talking about WATTAGE output of the inverter, not VOLTAGE.
If it put out 1500 (or 700) volts, it would destroy anything out plug into it. It should put out 110volts (US spec) or 220volts (Europe & elsewhere spec).
Amps are what are dangerous, not volts or watts. You could have 10,000 volts, but less than one amp and you would survive just fine, despite burns and twitching muscles.
However, one volt at 50A could kill you.
The notion that a shock felt in your fingers means it's not travelling throughout your body is also false. The nerve endings are in your fingers, that's why you feel it there.

Sorry, it is true. Check the specification of ANY CCFT backlight inverter.
Its wattage is 4-5 at laptops (eg. 800V at 5mA) or more (10-20) at tft monitors.

When I wrote 'it happenned to your finger' I meant you put just one of your finger and you touch BOTH endings by ONE finger of yours, because they are quite close.

Do you know, that inconvenient spark that is produced by static electricity at your nylon pullover canbe as high as 50.000V!!!??? And in spite of the horrible voltage, you are alive and just feel a weak bite.

The current determined by the voltage and resistance (Ohm's law).
Not 1A, but even 80mA can be lethal at the proper site (at least in animal experiments, applying to rats).
But nobody said that voltage enters your body. It also depends on MANY other factors. Higher the frequency, less likely the damage of deeper tissues.
Remember Tesla's experiments with exreme high voltage with high freq.
he was able to produce sparks as long as one meter (at ten thousands of volts) for the pleasure of his audience without risking (skin-effect).

The mains is dangerous, because it PROVIDES its voltage even for shortcut, in this case the current can be extreme high.
Backlight inverter just can provide it under certain circumstances. So when you touch the two outleadings, the voltage drops dramatically.