How can I Reset a Philips Magnavox 25TR19C to the factory default?

jrk190

New member
I have a Philips Magnavox 25TR19C Television. When I go to the AV1 channel, it works for a few seconds and then changes to either channel 3 or 70. It can be fixed by changing the channel to the AV1 again. This happens only when I first turn the TV set on. It happens no matter what channel I am on as well. I have a One For All Remote, model URC-4220. Please reply ASAP!
 
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