I have a MacBook Pro (13-inch, 2009)

I was changing the Thermal paste (remove the board and do some cleaning dust)

after reassembly doesn't sleep when lid closes

what the Hardware part are responsible for this problem ?

NOTE: I try Restored defaults in Energy Saver. Reset SMC (multiple times) Reset NVRAM ... still the same problem

I am sure its a hardware problem from reassembly I want to know the hardware part to check it