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What are the grey lines on the back of a LCD power supply board?

I was changing out some bad capacitors on my 40 inch Samsung LCD TV, and I accidentally dropped some solder on the back of the power supply board. On the inverse side of the board is a big long silver block. I tried using soldering iron and some solder wick to clean it up, but it didn't work.

What are these gray lines, and did I kill the power supply board?

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They indicate sections of the board like parts that are HOT AC and Parts of the board that are DC.. the silver is trace and if you bridged a connection YES the board is bad now.

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Thank you very much! I only spilled solder on the grey parts. All the silver parts are clean. I turned it on and everything it working fine.

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damien davis will be eternally grateful.
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