Question about Televison & Video
Not knowing the model it is impossible to tell what cap it may be if it even is a cap.The problem does definetly sound like the tuner- in order for the tuner to work 3 voltages must be present 12VDC,5VDC and Tuning votage which varies from 1-32VDC according to the channel/band selected.Check the DC voltages that feed the tuner (with a scope) and look for ac noise or poor filtering on any of the supplies if any is found trace back to supply source and check/replace caps in that area.
Posted on Sep 28, 2009
If it is digital tuner PSU capacitor, the Digital tuner will just shut down , or not start , or freeze.
In your case the internal eprom where channels get stored is erasing itself. For that reason channels are lost. The Eeprom memory is kept thanks to an internal battery, that will look like a kind of squared capacitor, or like a coin. The battery will last many years and is not replaceable. The problem is not the battery, but the circuit that supplies power to the eeprom to keep the memory alive, or the eprom chip itself, that is not holding info.
A firmware problem can also cause the problem.
In both situations you will need firmware image, and this is usually difficult to find.
Posted on Sep 26, 2009
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Posted on Jan 02, 2017
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