Odd Phillips T.V. problem.

I have two Phillips 27" T.V.'s, model # 27PT5245/37, just out of warranty with an odd problem. They are both intermittent dead sets. But mostly they both stay in standby, unless you start unloading the SMPS secondaries. If you remove the TDA2616 audio IC on one set, it will work, then if you put the "bad" IC back in the other set, it works. Has anyone seen this? Philips says replace the tact switches, but that makes no difference. Dani.