The markings on the outside of the tuner under the DigiTV label are:
TDED4-504A TDED4-504A 352226A MADE IN JAPAN
On the inside there appears to be two chips identical I think. They are about 13mm long x 2mm wide and 4mm high. It looks like they have 5 pins with the following markings:
EPCOS X7251D 4515 JIR4
A little looking around they appear to be http://www.epcos.com/inf/40/ds/mm/X7251D.pdf
that's the SAW filter. You need to look for the demodulator, this should be a pretty big (maybe 2..3cm length of each side) chip labeled with e.g. NXT6000 (this would be the one used on the old Nebula cards - but maybe they have changed this - ). Since the TDED4 has no demodulator built-in, this chip is probably located nearby the tuner metal can in your case.
Holger
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