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Hi, I'm Pete. Welcome to JustAnswer! I'm reviewing your question now, and will post back with your reply ASAP.
Did you use a genuine Samsung replacement lamp?
What happens if you swap the old lamp back in again?
Ok, then I suspect this TV set has been on its way out for a while, and the power circuitry has suddenly failed around the time the lamp was changed.
A repair is likely to cost around $200-300, so you will need to consider whether it is worthwhile spending this much on a repair or if you would rather invest the money in a replacement. You can get a good large sized LCD flatscreen TV for around $300 today.
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As well as the ballast board, there is another power supply board which is suspect - this board is where the AC power supply connects into the TV set (board number BP94-02141A)