I had a serviceman come under the warranty and he resoldered the suspect capacitor and it has been fine ever since. I believe the oldert sets may need a different capacitor.
Just purchased a Toshiba 61H71. I am on my 2nd replacement with the same problem. I understand it also existed with the 61H70 and other models. Most of the time you hear a loud pop, then the set turns off for a few seconds, then comes back on. Contacted Toshiba....phone support said they...