If this is a SCART connection, the cable box should be able to assert control when it's turned on. On my 650, the set will select an EXT port when turned on if it had been selected when last turned off.
On my TV (LE32B550A5WQXU Version SQO2) each time I turn it on, I have to go to source and select EXT 1 to get my cable channels. Is there any way I can make this happen automatically?
thanks in advance