When my son was given this set last December it had a four blink code. I removed and disassembed the fan in the back of the set, cleaned and relubricated it and reinstalled it. The set worked for three months and then intermittently began doing it again. The other day I re did he fan, (even though it seemed to be spinning fine) and the set again worked for two days without any problems whereupon it then started failing again. Someone suggested that this code could also be a "door problem". Is this the door in front of the lamp that they were referring to that could get overheated and distort?
I'm assuming that the fan outputs some sort of a pulse train on the third wire which the micro must look at. Is there any way to definitively rule out a fan problem such as by looking at this signal with a scope to ascertain if the fan is indeed the problem? Admittedly I have been chincing on this repair in relubing the fan twice now, and I don't mind buying a new one if that is indeed the problem. I just have my doubts though as the fan is turning quite nicely by hand. Thanks for any advice. Lenny