On Thursday, June 29, 2017 at 5:03:35 PM UTC-4, wrote:
Back in February or March of 2010 the TV began changing from any channel to channel 2 intermittently. Sometimes very frequent. Other times more intermittent but it would not go more than a few hours without the problem popping up. Replaced IC0102 (MN14834HH) Main IC for the Channel Selection Ckt but no help. Remote control IR circuit not the problem as I disabled it. Over time have replaced some bad unrelated hw (burnt resistor, Caps). Have schematics and service manual but can't isolate the problem. Nice picture and everything else works fine. Unit in storage but every 4 months or so, when I see it and think about it, I fire it up. Hate to trash this old tv. Kind of part of the family now. Has anyone ever heard of this before?

No STD, IRC or HRC position switch or other type of such options. Just the single 3-position switch: CATV1, CATV2 or Normal. TV has been running for more than 24 straight hours in the €œNormal€� switch position mode and has not changed to channel 2.

Moving 3-way switch to position:

CATV1 TV switched to channel 2 in a few seconds
CATV2 Waited a few minutes but it did not change this time
Normal Steady

When switch is moved to one of the three positions the tv defaults to CH2/Vol=21. I cleaned the switch and all is stable while I type these notes. Will monitor and report out.