I have seen this issue quite few times with various manufactrures, i have learnt quite alot from this forum too, well from what i have learnt so far i have checked everything i am sure the problem is with defrost section , i have checked heater with meter and it seems to be ok. I am not sure how can i check thermal cutout , and how can i find defrost timer. its not near evaporator as far as i know, if some one guide me to check thermal cutout and then defrost timer and finally/obiviously fault will be in main board ,

for refrence thats the Manufacturer part Number C00195880 which i think could be bad from my research on this forum,