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I pulled the Sams Photofact on your set (2811-2) and I see that you have the dreaded "dual module monster" chassis. However, there is a capacitor in the power supply that has a high failure rate and can cause the problems you're having. Looking at the back of the set, you will notice two large boards next to each other. The board on the left is the main module. The board on the right is the power supply / sweep module. On the far left hand side of the power supply module; you'll notice a large electrolytic capacitor (680 uf, 200 v) Now, look directly behind & to the right of that capacitor and you'll notice another smaller capacitor (100 uf). Directly to the right of this cap is an 8 pin IC (ICX3401). I have seen that 100 uf cap bad several times. Take note that this is a polarized capacitor and the new one must be installed just as the old one was. Electrolytic caps can and will explode if installed backwards. If that cap does not do it; let us know and we'll see what else we can come up with. BTW, if you have access to a CRT tester; check the picture tube. '90's Zenith tubes don't hold up that well and it would be best to know what condition the tube is in before you dig into the power supply too much. I use a B&K 480 CRT tester. If you can find a B&K 467, 470, 480, 490, or a sencore Sencore CR70 tester; you might want to get it if the price is right. These are often on ebay at a reasonable price.
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