crwdns2934241:0crwdne2934241:0 Arie Prins

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There are on one side of the mainboard 4 black capacitors and   in the center of then, there is a big transistor. Type is TIP127.  This one is responsible for on/off switching. Try to replace and test again. I suggest however to replace this one for  an TIP137, this one can handle  a little more power.

crwdns2915684:0crwdne2915684:0:

open