hey ok, been a good day! lol. umm..yeh. i now have, a multimeter (which i dont know how to use) a monitor cable from a samsung monitor, on one end of the cable is the standard d-sub connector, and on the other is a male 9pin serial connector, the type that you get on a motherboard underneath the LPT port(parrallel) i also have an old microsoft mouse cable, which has a female serial connector on one end and on the other is bare wires, the entire thing is pretty well insulated, has that metal wire shielded around all the wires and then the outer plasticy one. first question: how the F do i use a multimeter? ive only got this for today as its on loan from my uncle who uses it at work, its a HILIX DT-830B. its the same one in this pic tho:http://www.hobbytron.net/media/DMR-1000.jpg how would i use this to figure out which pin corresponds to which pin on the samsung cable (ie, which pin on the dsub connector corresponds to which connector on the other male serial end) second question, would it be worthwhile making the cable socketed? i dont really wanna cut up the samsung cable as it can still be used on the monitor it came off. thanx
That doesn't even seem to have a contingency checking beeper... And you say he uses that at work? Anyway, use the lowest ohm setting, 200 it seems to be. You are looking for values under 5 ohms (probably lower, but i'll say 5 to make sure) Just set it to 200 ohm and put the test pins together, if you don't figure it out from there, go outside and ask the first person you meet
that unit is part of their little 'first aid' kit thingy for the machines that they use there, they manufacture 'bar turned parts', its my dads business, the machines tend to break down everynow and again or the switch or something will wear out, its just for occasional use! thanx, ive managed to figure it out! used a fixed resistor and fiddled with the setting! thanx!
I'll agree wholeheartedly with the "Be careful" warnings. You really don't want to mess around with HV inside a monitor. Do *not* go near *anything* other than the solder holes on the PCB where the Signal lead arrives. Death/Hospital is A Very Bad Thing, and to avoided at all costs... I know, I hit a HT lead by accident, and I'm damn lucky all I got was concussion from hitting my head off the wall behind me The Discharge from these things will *literally* blow you away... BE CAREFUL
hiya all. well cable got worse and worse, until i eventually got too pissed off at having to keep adjusting it, so got the lead from an old samsung monitor, that had a male serial port on one end and the d-sub on the other, figured out the pinouts, got an old microsoft serial mouse, worked out which wire was to which, chopped off the dell wire, figured out pinouts and soldered to a stripboard! works great now, just a little bit of ghosting, but i can put up with that. and no i didnt die either!
at my old electronics shop it was standard procedure discharge tubes using a specially designed tool that fit under the cathode boot. At the service facility i worked at, the specially designed tool was a huge long screw driver with a large earth strap connected, talk about a loud pop noise when the cathode was shorted. (not a very OH&S minded company) as for measuring the HV, you don't want to know how. luckily i didn't have to repair many 15" oscilloscope displays. 240VAC is like a tickle compared to a HV zap, as has been said be damn careful if you open a tv/monitor case, for a few measly dollars you life may not be worth it. If you do open stuff like this up, then at LEAST, have someone present who knows CPR, or who can call for help. (just ask them to be quiet while you work so they don't distract you)
If we are talking that kind of solution, going over all the capacitors with a 500k resistor or so should do the trick, use a pair of isolated pliers or gloves... Measuring HV is dead simple if you don't mind that the measuring affects the result somewhat. a 10:1 or 100:1 voltage divider with 10M or more on the high side should work fine.
