I am thinking more along the lines of the pop you hear being a high voltage discharge (that should not be happening). The source could be one of the several thick red wires which you should NEVER touch. The focus divider block located at the front lower right side under the speaker cover. You can unplug the set and inspect that for a crack. If cracked, you must replace it. Although this one is Toshiba, RCAs are really bad about that. You must be very careful, TVs have many dangerous voltage sources that can injure and potentially kill. If you are unfamiliar with TV servicing I would take it to a shop.
Repair or replace the power supply
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I have loud popping noise also and need to know what to do.... It seems to occur after the tv has been on for a few hours.
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