Chassis removal and yoke reading pictorial

[invzim]

Have been messing around with my chassis lately, and took some pictures. This is just to give a look, if you do this without disconnecting the main power etc, you are an idiot


This is the high-tech tool used to discharge the monitor:


Attach one end to the earth bridle on the tube, put one hand in your pocket, and poke the screwdriver under the anode cap until it touches metal:


This is how the connector looks:


Now you can GENTLY pry the neckboard loose:

Remove other connectors:

red/blue cable is horizontal deflection
yellow/brown(green) is vertical deflection
White is degauss
black is gnd

Read the Horizontal Yoke Coils inductance, in this case 0.2milliHenry (mH).

Read the horizontal resistance, in this case 0.5ohm.


Repeat for vertical, and that is pretty much it.

[grantspain]

[dmauro]

Do I have to earth my cab before doing this?

[invzim]

I've done this on older monitors that "crackled" when touching the anode, without the chassis/monitor being earthed - so I guess the answer is no, but can't explain why..

[dmauro]

Well that's odd, but I guess it will make the job easier.

[dmauro]

I think I would feel safer if I used this stripped power cable's ground wire to discharge the tube. Is there any reason I shouldn't connect the alligator clip to its ground wire, plug it into the wall, and then touch the anode cap to discharge?

[dmauro]

I think I would feel safer if I used this stripped power cable's ground wire to discharge the tube. Is there any reason I shouldn't connect the alligator clip to its ground wire, plug it into the wall, and then touch the anode cap to discharge?

I did this and did not get shocked or anything so I guess it worked. There was no audible noise when I made contact with the metal, but it might have been off for a while.

[grantspain]

most modern monitors(after 1990) have a discharge circuit built in to the chassis so thats why you very rarely get a spark when discharging
if you had done this on an old microvitec monitor you would have seen a firework display

[Ordyne]

I've done this on older monitors that "crackled" when touching the anode, without the chassis/monitor being earthed - so I guess the answer is no, but can't explain why..

You're not discharging it to earth, you're discharging it to the chassis ground hence why the earth will make no difference.