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As sound output is ok, main board is correct with respect to sound output, video IF and ther stages. The fault lies on the horizontal output section. It may be LOT fault. Check it further for horizontal oscillator stage, and horizontal output stage. Check the collector voltage at the horizontal driver transistor. If you have a frequency meter, check the frequency of that point. It should be somewhere near 15625Hz. If the frequency there is Ok, then proceed to horizontal output stage. Check the horizontal output transistor. If it seems to be faulty, replace it with similar type and number. If the replaced horizontal output transistor heats abnormally within seconds after swich on the set, surely LOT has troubel. Replace it also with same model mumber and type.
If it recovers by itself, yes, it should be a cheap fix. It's most likely bulged/leaky capacitors in the power supply and flyback area. Check all the capacitors, and in my experience if you see a suspicious one it is best to replace all of them in that area, they are cheap and will save you from more serious issues.
You need to consider the following tips herein as follow:
1) Field collapse (horizontal white line on screen) R710 dry joints. Same as C2146TN & C2546TN problem solved with thanks to Mike G & Barty. Power off/unplug. Get to circuit board underside with aerial socket up-R710 is near top and right of centre-cluster of 4 joints best resoldered
2) Picture is horizontally narrowed and deformed Capacitor C2913 (390nF, 250V) on the deflector PCB had lost capacity
Yes, I have been seeing a lot of those Toshiba IR receivers bad lately. Replacing it with a new one should take care of your remote problems. If you have never replaced small parts on PC boards then have a qualified tech handle it for you.