I've documented my issues with my SX838 here: http://www.audiokarma.org/forums/index.php?threads/another-sx838-help-thread.852969/ Unit was still going into protection after replacing Q7, Q6 on protection board but it held for a few minutes before tripping. I left it for a day and today, I turned it upside down, powered it on and timed how long it would stay lit. Well, I'm at about 45 min and it's still playing at 1/4 volume. I do notice some discoloration (heat) on the PS board. The large R3 resistor measures 91C right now and Q1 right next to it is at 62C measured at the base of the heat sink. Q2 on the other side, further away from that resistor measures 54C at the same location. Any ideas as to whether this might be related to the protection problem? I'm thinking that with it upside down, the heat is dissipating better. Is replacing Q1 & Q2 as well as the resistor the solution here?