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Hi. This might indicate that your TV is eiter in "channel " mode or in "number" mode. Channel is rhe real channel from the transmitter, (being 2-62, S channel) while the number is the one you change by your remote. There must be a way in the menu/tuning where you choose between both.
Hello Connec the external areal to its ariel socket at its back side, and get into its meny option, select 'autotune', and press vol (+) button on the remote control. If the set ahs a 'Menu" button on its front panel, you can do this by pressing the Menu button, surf thorugh, select autotune and press Vol(+) button once.
Sony's have dual tuning systems to allow for the separate PIP channel. The common problem on the Sony's is the circuit board and tuning module connections go bad. It is likely that the connections on the board or module were already in the decayed process and moving it just accelerated the issues that were inevitable.
The quick fix is to swap the PIP over to the main picture or to bus the antennae signal to the antennae B terminal thus bypassing the bad tuner module.
The recommended fix action is to have someone with soldering skills to remove the chassis, and locate all the cold and cracked solder joints, especially near the tuning modules. If this does not take care of the problem, the tuning modules will need to be removed for re-soldering on the actual tuner modules.
If none of the above works, then you can always use the audio/video outputs of a cable box or vcr to the a/v jacks of the tv, thus bypassing both tuners in the tv.
IF your TV is not one of the real old ones, you have a problem with the automatic tuning system.
Some component in this circuit most likely a capacitor or coil is changing its electrical properties due to temperature which in turn causes the set to be off frequency until it warms up.
A capacitor (condenser) can do this quite often.