Leadtek TV2000XP Expert modification by smdg.

DISCLAIMER: THIS INFORMATION IS PROVIDED ON THE STRICT AS-IS BASIS. THE AUTHOR OF THIS PAGE AND PHOTOGRAPHS DECLINES ANY RESPONSIBILITY AND ANY DAMAGE THAT MAY RESULT OUT OF READING AND/OR USING THE INFORMATION CONTAINED THEREIN.

DO NOT ATTEMPT THIS IF YOU HAVE NO EXPERIENCE WITH SURFACE-MOUNT COMPONENTS.

This modification was done on a Assy rev A, PCB Rev D card.

From the electrical standpoint, the modification consists of adding a voltage regulator to supply local, regulated +5V power to the TV tuner. The regulator is powered from the PCI slot's +12V power rail.

The pictures

(Click on the thumbnail pictures to enlarge.)

General view

Top side of the card:

Bottom side of the card:

Close view on the regulator

The regulator is soldered to the ground copper layer on the bottom side of the card, there was no suitable place on the top side of the card:

The connection to the +12V power rail at the PCI slot

, implemented with a copper wire.

The connection to the tuner

The regulated +5V is fed to the tuner through the original power decoupling LC networks implemented on the board. These LC networks were powered from the general board's +5V power rail; the vias connecting to the board's +5V layer have been destroyed.

The connection is done with a copper wire.

The first:

, view at 180°:

The second:

, view at 180°:

Notes

Was used a regulator equivalent to the LM7805, in a TO220 package. Soldering it to the copper layer provides a good heat dissipation path.
The filtering capacitors at the input and the output should be selected according to the regulator's datasheet. I have used some compatible parts that I had at hand: 10uF at the input and 2.2uF at the output.
The connection was done with a 0.18mm isolated copper wire.
Different irons are expected to be used to solder the regulator / the capacitors, and the wire to the board.