50P8341 shuts off when place in AV mode.

[Joe M]

I have a Philips 50P8341 that if I put it on one of the AV channel like AV1 or CVI,AV2 or AV3 it shuts off and when turning it back on if it was on one of the AV selection it won't boot up. Channe 3 works and the tuner works. I also found that if I have 2 sources hooked to the A and B antenna then the PIP locks up. I am not sure if it is the Small signal board or not. Has any one else hadf this problem