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Sounds like the Invertor for the backlights has blown. if you are lucky and it is just the invertor blown it could cost £50-£150 for a new invertor board, but if you are unlucky then the backlights themselfs have blown too which means the TV is beyond economic repair.
Yes, I can help you! You have a bad y or z sustain board! I do have both of these boards in stock & I can also help you with figuring out which one of these two boards are bad! Please feel free to give me a call @ 1-503-432-9904 or message me @ [email protected] Ask for Dave! Talk to you later! :-)
The pop you heard was probably the Y-sustain board. The "sound, but no picture" problem is common for plasma tv's. I fixed mine buy replacing both the Y-sustain board and the Z-sustain board. You can find both boards on ebay for around a total of $150.
Then it is probably not cold solder joints. You wouldn't think that an lcd TV would need a high voltage transformer but it does. They are very small compared to CRT televisions but they power up the screen. Without it you have no backround light to veiw what is there. There are two neon lamps on either side of the screen but they rarley go bad. My guess is the transformer ot the power supply feeding it.
Most likely what happened is one of the capacitors went bad. When a capacitors goes bad it produces a popping sound. This could be an easy and cheap fix if you find the bad capacitor or capacitors. The bad capacitor will have a bulging top most likely on the power board but could be anywhere.