Just wanted to say thanks lcaillo, for all your time to put this thread together , I was very nearly caught up in the extorsion that my local repair guy (Gold Coast, Australia) was about to inflict on me.While the 12 volt supply might be able to handle the extra load, for safety reasons I would recommend not trying it. You also may get some noise feeding back into the video or audio circuits from the fan. Just keep using the wall wart.
HHmmmmm, thanks lcaillo, soldering in the New IC's may have elevated me to Legend status with the family, but Im out of my depth well and truely now.These ICs run hot, but some sets hotter than others. Excessive dc ofset or excessive correction at the edges of the range of the chips can make them run hotter. I don't have a problem with fans, as long as they are mounted externally and do not use any of the internal power supplies in the set. I would start by verifying the setup is consistent with that in the service literature for your set and that there is no more than a couple hundred millivolts of dc on the inputs to each channel of the output ICs.
I am happy to provide general advice or obvious symptom repair info, but cannot provide step by step troubleshooting on specific sets, nor start a tutorial on service torubleshooting. If the info that I have provided is not sufficient, I strongly suggest that you get a professional involved.HHmmmmm, thanks lcaillo, soldering in the New IC's may have elevated me to Legend status with the family, but Im out of my depth well and truely now.
Any Ideas on how I would start to verifying what you speak of.