My Philips TV (27PT832025) has great picture, but NO sound; the screen display seems to be stuck on "mono" (i.e., it won't go off) ... all the other controls and features appear to work fine, but I can't switch from mono to stereo mode, and nothing will reset the sound (speakers are on, all the other settings are as the manual specifies) ... I even went as far as looking up the reset procedure and entering the code, etc. .... I got through to the SDM screen and viewed the service menu, but was unable to reset the error codes (the offending one seems to be "14") back to all zeros... this function (and the changing from "mono" to "stereo" in the regular setup menu) are the only things that don't work.

Any suggestions before I submit to the formal "service" process? (the Philips support folks have yet to respond to my messages; I do have a reasonably honest and reliable service guy in my neighborhood, but speed is not his strong point).

Thanks!