all boards:

Brooktree Bt848/848A/849/878/879: video capture chip


Miro PCTV:

Philips or Temic Tuner


Hauppauge Win/TV pci (version 405):

Microchip 24LC02B or
Philips 8582E2Y: 256 Byte EEPROM with configuration information
                 I2C 0xa0-0xa1, (24LC02B also responds to 0xa2-0xaf)
Philips SAA5246AGP/E: Videotext decoder chip, I2C 0x22-0x23
TDA9800: sound decoder
Winbond W24257AS-35: 32Kx8 CMOS static RAM (Videotext buffer mem)
14052B: analog switch for selection of sound source

PAL: 
TDA5737: VHF, hyperband and UHF mixer/oscillator for TV and VCR 3-band tuners
TSA5522: 1.4 GHz I2C-bus controlled synthesizer, I2C 0xc2-0xc3

NTSC:
TDA5731: VHF, hyperband and UHF mixer/oscillator for TV and VCR 3-band tuners
TSA5518: no datasheet available on Philips site


STB TV pci:

???
if you want better support for STB cards send me info!
Look at the board! What chips are on it?