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| A note about monitor discharging |
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| Jack Burton:
I'll add to this to keep one hand in your pocket at all times if you can when working on any sort of monitor. I don't know about you guys, but for some reason when I'm working on something my left hand tends to drift to rest on top of it if I'm using my right hand for a task. I melted the tips of my fingernails pretty good a while back while working on a tv on the floor. that's another thing. Don't work on any electrical device in an informal setting. Don't just pull it out on the floor and go to town, or work on it inside the cab. Make sure you have everything in an easy to get to position and you are away from anything that could harm you in a scenario like Xioau2 went through. |
| AndyWarne:
--- Quote from: CheffoJeffo on May 06, 2009, 07:59:40 pm --- While I agree in principal with what you and Andy are saying (and I virtually never discharge *before* removing a monitor from a case or cabinet because it is safer to do it after), I would never leave an undischarged monitor lying around ... partly because I have kids and a wife who aren't as aware as I am, but also because it just makes sense. --- End quote --- Thats fair enough. This fits in with the analogy I used on another thread. Think of the CRT as a can of petrol. Perfectly safe to carry around when the cap is on (the anode cap in this case) but can be dangerous if opened. No parts of the chassis or main board are connected to the final anode. In fact discharging the CRT can lead to a false sense of security because the real danger lies in the power supply filter caps on the main board which can hold a lot of charge for a long time, especially if the monitor has certain types of faults which leave the power supply without any load. These caps are connected to large areas of the main PCB and completely exposed. The CRT anode voltage is not exposed anywhere normally. |
| CheffoJeffo:
Best analogy (and I had been looking for one ... rejected the "loaded gun" as inappropriate) I have seen. :applaud: Also explains nicely why I got bit by that G07 (I now know better). Monitors are to be respected, not feared. I do encourage people to understand how they work before do even something as simple as a decasing. I also second Jack Burton (Who ? Me! Jack Burton!)'s comments -- if you are going to work on a monitor, do so on a prepared work surface. |
| FrizzleFried:
--- Quote from: Xiaou2 on May 06, 2009, 05:22:10 pm --- As an arcade tech, I had to 're-juvenate' a tube with a special machine. It was a real pain.. because it had to be done several times. Thus removal and discharge many times over to see if the thing was decent or not. On the final cycle... I had thought I was finished... and started to plug the game back in... but realized I needed to do something else.. and pulled the cord out fast as hell. The cord may have been in there for less than 1/4 of a second.. and so I figured there couldnt have been much of a charge in there to worry about... I was less cautious... and "POW" a bolt jumped to my hand! I was about 1.5 ft away from a wall. My body was jolted backwards. My elbow hit the wall at warp speed... so hard, it nearly broke my elbow. My back hit the center mounted wall bumper. I felt like I had been hit by a car. My whole body ached in pains from the intense zap as well as the wall impact. My fingers smelled like they were burnt. There were internal pains running inside my arm. I was Extremely overcautious from that day on. Discharge a monitor and let it sit for 10 min after the first discharge... and it still may have enough charge left to bolt you across the room. Im probably lucky to be typing this stuff. It can be done. But it can also be dangerous. Be careful, and never take them lightly. --- End quote --- Why were you removing the anode when you were rejuving? You only need to discharge... no need to remove the wire. |
| shardian:
I notice that you vets on here say that you have been zapped, but after you plugged in the monitor briefly and forgot to dicharge. My habit is to always touch the discharge tool to the anode every time before I bring anything near it. I 'discharged' the monitor maybe 20 times while fixing the anode clip. The tool is already hanging there, why not be safe and give it a quick probe? My point: Your monitors weren't evil beings that thwarted your safety protocols - you just forgot your protocols. Yet you still word your stories in a way that puts this cloud over your warnings about monitors. P.S. I learned a long time ago to use a screwdriver to discharge large chassis caps before working. |
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