Radio station stored info lossing

[Ecvenky]

Hi,

I have a Samsung DJ550 model radio/Disc player, recently found a problem where it cannot store for the FM Station info.
I tune the station, store the channel number, it works well while it is on, but when system power is off and power on. all the stored station info is lost and have to retune it.

How can I fix this problem please suggest.

Thanks
Venky

 

[barry]

Either the station information is stored in battery-backed RAM, and the battery is dead. Or its stored in FLASH and the FLASH is bad.

 

[Ecvenky]

Thank Barry for the reply.
I did not find Battery backed RAM, which would be similar to be in computer motherboards.
If it is stored in FALSH, how to find which is flash chip?

 

[FvM]

There isn't necessarily a RAM IC, data can be also stored inside a microcontroller, but surely a battery or super cap. The latter may look quite similar to a regular electrolytic cap, just with a high capacitance, e.g. 1F.

Storage in flash is surely possible (in or outside µC), but it's unlikely to go bad.