Help with JVC convergence issue

I need some advice. I attempted to replace the two STK392-110 chips on th econvergence board. Although I first removed the back cover only to realize it was much more accessible from the front. Question one is concerning the booby trap. I replaced all bock covers but I am not sure how this booby trap works. Would it cause any problems or does it just not let you power up if back cover is not present? Question two; Unfortunately I am now not getting any picture and a strange audio sound like a heartbeat coming from the set. Granted I am a novice at soldering but tried to insure none of the solder touched between pins. I did try to go back and clean it up better but still with same results. Any comments or suggestions are appreciated. thanks!!

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