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My LED TV is broken, so I disassembled it, and saw this weird thing on the power stage: weird filling

Above it, there are two 3 ohm resistors. (owners of the large drill holes in image) What could be the purpose of these? The only thing I came up with is that it is a clever use of solder to help the resistor from overheating. Is that the case here? How much of a difference - approximately - would they make?

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It looks like a PCB heat sink. They left holes in the solder mask so solder would adhere to the copper pour to add surface area to improve heat rejection.

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    \$\begingroup\$ Nice pic btw.. I was looking for something like that a week ago for another question. \$\endgroup\$ Commented Mar 25, 2017 at 6:42
  • \$\begingroup\$ That is nice. Are these common in high power (like this TV) application? This is the first time I see something like this. \$\endgroup\$ Commented Mar 25, 2017 at 6:47
  • \$\begingroup\$ It's one of those.. "it's free so use it" situations if you have clear space under a power part. \$\endgroup\$ Commented Mar 25, 2017 at 6:52

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