How to use Sams' Photofact. and vertical deflection problem.

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Are the voltage and resistance values "in-circuit" measurements? Should the tv be off and unplugged? What if the actual voltage measurements don't match those quoted in the photofact - Is the component bad?

Any good links on how to test tv components with a DMM?

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I had a problem with the vertical deflecion in my old Zenith. Blackness started moving up the screen obscuring most of the picture. It started off only covering a small portion of the screen, and eventually moved up to where only the top 10% of the picture was visible and the rest of the screen was black. Whacking the tv used to help, but not for long.

This was my first tv, so I kept it. I finally have some ability to try to fix it. I read a few tv repair books and

. I cleaned up the inside from dust, and learned where each circuit module was. I decided it was probably a fault in the vertical circuits. There is even a burned resistor on that module. Though I thought it might be a dried up electrolytic capacitor. Please keep in mind that this is my first attempt at tv repair.

I finally plugged in the tv and turned it on. And the problem was not there! Intermittent then. I tried heat and cooling (b/c I was afraid to touch it). Then I used a plastic tube to press on the board, and this fixed the problem! So I'm thinking it's a bad connection, because pressing on the vertical module fixes it if it messes up.

Any comments? suggestions?

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I suspect the red output transistor on the CRT board. How can I check this with a DMM and Photofact?

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Some other questions:

*My DMM is autoranging. Does this include a small range diode test? (Fluke T5-1000) *How can you determine which big capacitor is the main filter capacitor? *How do you actually test transistors - resistance, voltage, in-circuit?

Thanks if anyone actually read this! Tom K