Service Manual for Ball TV-90 monitor?

I tired to look at that URL earier (when I was on a machine with a graphical display), but for some reaosn I couldn't access it. So I've not seen the actual distorted image. However, very few monitors use any form of linear amplifier stage to apply a sawtooth current to the horizontal defliection coil (they do for the vertical, of course). Rather, they use the inductance of the yoke as part of the sawtooth generator. The horizontal output stage is essentially a switch. Before you go any further, check the supply to the monitor. If there's something wrong in the PSU you might get significant ripple at the horizontal frequency which will produce 'interesting' displays. Things I would check : The horizotnal output transistor and its drive (although if it's not been turned hard on and off, it'll overheat and fail very quickly0 The flyback 'damper' diode Any damping resistors in paralell with inductors in the yoke circuit A horizontal linearity coil (if one is fitted -- and check it's the right way round. It may be a 2-terminal inductor, but it is polarised). The yoke coupling capacitor (OK, you've replaced this) -tony