Quote:
Originally Posted by CRTguy
I adjusted the parabola service menu item and it didn't fix anything. Parabola adjusts corner pincushion but doesn't do anything to fix bowing in at the sides (looks like an hour glass).
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There's a few possiblities that would have the effect you are seeing.
You already eliminated the easiest one, which is bad adjustment.
That leaves dead components. The by far most likely thing is one or more electrolytics have failed. As you heard from redk in their previous post.
The function that controls the parabola is called "EastWest" and is probably denoted in the schematic for your TV as the "EW out" pin on the monolithic video IC. This can be seen at pin 59 on page 22. It joins the deflection circuitry at Q411 on page 23 (towards the upper left side of the page).
I would focus on the electrolytics in this section, beneath the vertical output IC.
However, I would also heed redk's advice and check the electrolytics in the power supply, and I would also check all of them in anything that gets hot (next to a heat sink or power resistor) or just any of them in the deflection area as those tend to get a lot of juice.
This set is an Orion set (not actually made by Toshiba) and it's 2003, which is
capacitor plague era. There's every possibility that all the lytics are going to leak or explode unfortunately.