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DLPLCR4500EVM: Help with Removing Heatsink for UV LED Modification

Part Number: DLPLCR4500EVM
Other Parts Discussed in Thread: TIDA-00293


I am trying to replace the blue LED in the LighCrafter 4500 EVM with a UV LED as per the modifications instructions for the TIDA-00293 reference design. After removing the 4 philips screws as directed in step 4 of the DLP LightCrafter 4500 Modification Instructions, I found that the heat sink was very well bonded to the light engine and I was unable to separate the two. 

Is there a trick to this? Do you have any tips for easily separating these two components without damaging the unit?