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Re: Sound, no picture.
Problem might be in your Video processing cirucuits. if the picture cracks time to time. there might be not a big problem present as it is due to weak wiring and circuit dusting. if there is no video completely then the problem in tuner,video if sections,deflection circuits. Contact service engineer as it may not require any rectification from user part thank you !
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Are you using the AV input for the XBox or other cable? If you use AV, then use the same input that the Xbox does not show picture, plug in a DVD and see if it works. If it does not have a picture, so 100% your TV has problem.
No picture but sound can mainly be of two problems, most of the times it is caused by a faulty vertical deflection ic, you can diagnose this by slightly increasing the screen voltage by turning the screen control on the LOT, a horizontal line will appear if the vertical ic is shot, and the other problem is the CRT base, but this is less common for shot base won't go off at once, it will show picture faded in the beginning. Now another problem could be the horizontal output transistor, if the tv has a high power sound output, the sound power supply will come from smps itself instead of from LOT, check that too, to confirm this, check if the CRT filament is glowing. Good luck.