My son was playing his wii on our 40" Seiki SE421TT when he heard a popping noise which blanked the screen. There is no picture and no sound although the blue power light works. Do you have any suggestions as to what might have happened and what replacement part we need? 
A popping noise is generally consistent with a capacitor exploding. This is common on power supplies since manufacturers tend to use the lowest value, lowest quality capacitors they can find on these units. A blown capacitor is easy to spot, and you may see others that have swelled and are ready to burst as well. Replacement of these with better quality capacitors often restores operation. Some skill at soldering is required. If you are not familiar with electronic repair procedures, it is advisable to get someone who know how to do it for you.
Testimonial: "Would replacing the Power Supply unit suffice? Would you say the T-Con Board and Main Board were not affected?"
You would need to verify that the damaged capacitors were in the power supply unit. I cannot say for certain that nothing else would have been damaged, but the power supply is designed to be a sort of fuse in itself in order to protect downstream circuitry. If the Power Supply unit were not too expenseive or difficult to replace, I would give it a shot.
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