When LED's burn out, it's generally because either the wrong value current-limiting resistor (CLR) was installed, or there's a short between the LED and that resistor (R5 on the labeled PCB diagram below, 4.7 Kohms) that bypasses its current-limiting function.
Photos of both sides of the PCB would be helpful. They need to be large, well-lit, well focused shots for us to be able to see enough detail to troubleshoot effectively.
BTW, what are you using as a power source?
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