"Zephy" wrote in message
ups.com...
| Thanks for your help and ideas. Yes I admit I was looking for the quick
| fix. I'm going to need to remember my more in-depth troubleshooting
| skills, limited as they are. (I worked as an electronics technician
| about 20 years ago, used to do some component-level fixes of Macintosh
| power supplies when I was working as a consultant, and have built small
| projects). I do have a DVM and an oscilloscope, and 2 good units to
| compare with. I wonder if I should invest in a capacitor checker. Kind
| of makes sense that capacitors would be more likely to degrade than a
| silicon chip or transistor. Would a resistor drift over time if there
| were no current running through it? Yes, some of this is guesswork, but
| it can be useful if in the exploration and exchange of ideas, I get
| more of an idea where to focus once I get down to work.

There are troubleshooting guides on the web, and many larger libraries will
have books on TV repair. I would start with the vertical and work my way
back trying to see if the sync system for it is working OK or not. That may
fix the horizontal as well.

N