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.