[TinCanAlley]

Originally Posted by Username1

Good morning;

Ok, lets begin with your scope. It needs to be checked for some level of calibration. This can be done by you at home for a very little amount of money. You need to get a series of 9v batteries, hook them up to give you 18v, 56v, then check the voltages with a volt meter, write it down. Then use your scope, - lead to ground on scope, hit the + battery with your scope probe. If you have to make a circuit with a momentary contact switch and hook up your wires and watch your scope. You should be able to verify your scope is reading the proper voltage range this way.

You mentioned two spots where your voltages might not be correct. These need to be investigated. This is the way you will find this problem.

As an example, lets look at a audio amplifier, one with a pilot light on it. If you run it at some mid volume, the sound will be clear. If you turn it up to saturation, especially bass, it will distort, and in most cases the pilot light will begin to dim with the bass notes. Your jail bars are coming from something that is allowed to saturate, something in the horiz, output area, and it is ringing, and you see it everywhere in the tv, just like in the audio amplifier saturation blinking the pilot light. If your set were working correctly, this would be filtered out, but a spike it too large and showing up in places it should not. While the jail bars may show up in many places, it can only be fixed by removing it at the source, the horiz section of the tv.

In these sections in the pictures I am posting, you need to be sure all of the voltages, wave forms, are correct. There will be some clue, voltage wrong, wave shape wrong, open coil, changed resistor, something. Start with the Horiz driver, then go to horiz output, then flyback. Focus on the items in the three pictures I am uploading. If the voltages or wave shapes, sizes of wave shapes, p-p voltages are wrong, do not go on to the next stage. Check everything listed, voltages, wave shapes and sizes peak-to peak dc offset if its there. If the osc, driver section (left picture) has something not right, stay there until it is.... Do not go on to the center picture items.

Start with the left picture, then center, then right.

The scope was professionally calibrated when I got it a couple of weeks ago. I know it reads the same voltage I get with my DMM.

Tomorrow I'll start on your list. I know it's not the horizontal driver as I replaced the module with a newer, NOS board and have the same problem. That module has the wave shaper, horizontal AFC, OSC and driver. The module isn't the source, but it could be affected by it.