New
#10
I figured as much because it has a few capacitors laid in there plus flash ram / battery to remember the passwords given to it
still good info though for people who need to know why this is
I figured as much because it has a few capacitors laid in there plus flash ram / battery to remember the passwords given to it
still good info though for people who need to know why this is
Typical Power drain technic.
Although the normal power drain time is 30 to 45 seconds for best results.
For a router unplug and hold reset button for the same amount of time.
This method will work. Generally the longer the power is removed, the more voltage that will dissipate. But a good CRT will retain voltage a long time. This method will result in a significant zap, but will not harm the CRT.
How to Discharge a CRT Monitor: 11 Steps - wikiHow
A Guy
I used to cannibalize old TV chassis for parts when I was a kid (there was a TV repair shop on my way home from school and they would throw dead TVs out back; I suspect they depended on us kids to get rid of much of their trash for them). Since a chassis and CRT were too heavy to haul home on my bicycle, I would remove the CRT first. After one knocked me on my ample asset while removing the lead from the flyback coil, I learned to discharge them first, using a screwdriver with an insulated handle.
If the charge doesn't bleed down on its own (the older ones didn't have a resistor in the circuit to bleed down the charge), it's the terminal for the wire that attaches to the side of the CRT. I always slipped a flat screwdriver blade under the boot on the connector to bleed it off (it often made an impressive flash). Keep in mind, I haven't touched the inside of a TV in 40 years.
The only thing capable of holding a charge either in modems, routers or TVs (including the older CRT TV and monitors) are capacitors. What makes the older CRT based sets so dangerous was that the CRT needed extremely high voltage to shoot an electron beam to the screen to illuminate the phosphors. Thus was accomplished by using a flyback transformer to raise the voltage level from the capacitors. Since the older CRT sets had large capacitors it could store a lot of charge which through the flyback transformer could give you quite a zap.
Flyback transformer - Wikipedia, the free encyclopedia
The CRT cannot store voltage, but their is a connection on the side of the CRT (a thick wire) that comes from the flyback transformer which could give you a severe zap.
Edit: After doing some research I have found CRTs can indeed store some high voltage (because of the construction). Sorry
The Truth About CRTs and Shock Danger
Last edited by PaulGo; 21 Jul 2013 at 22:31.
Quite right Lady F. The CRT is a capacitor. The plates of the capacitor are the outside layer of graphite type material "dag" which is grounded to the chassis of the unit by bare metal wires under spring tension. The other plate is a metal covering on the inside of the crt which the EHT connects to via the connector from the flyback transformer with the glass as the insulator. The usual voltage is 25KV to 30KV but at a very low current generally not fatal. There is also a focus supply of around 4 to 5 KV and a screen voltage of 200 to 1000volts. The old TV sets from the 1930 used mains developed EHT (Extra High Tension) at 15A and these were widow makers. Microwaves are the same for the very same reason, high current and high voltage. Of course this technology is becoming obsolete. Heck DLP projection TV's, CRT projection TV, and LCD Projection TV's are headed the same way. Plasma TV's seem to be heading that way too due to their complication, high power consumption and weight compared to LED lit LCD's or Cold Cathode Lit LCD's which are much simpler to make and repair effectively making service of the units out of warranty cost prohibitive and causing TV technicians to lose their jobs like the 300+ from Best Buy last July. You are now likely if you have a unit purchased from BBY with a warranty and in home service to get a guy who fixes washing machines mostly as a lot of manufacturers don't even want anything 40" and below repaired it is exchange.