• Attention: The following description comes without any warranty, it´s on your own risk! The soldering requires some experiences. There is the risk that the TV chip get damaged or that the whole grpahics card get damaged!

Completely modified card

If there is an s-video and a composite output on the graphics card then all you need is the resistor R9 (75 Ohm) and the both diodes CR4. Chrontel suggests the types 1N34A or 1N44. These components shouldn´t be left out, because the diodes protect the TV chip against high voltages from the TV. Unfortunately it can´t be found in the Chrontel datasheet which value is used for the inductivity FB 4. 1.8 µH should do it. Pin 21 in the pinout of the scart connector is the metal housing of the connector by the way.

Official Chrontel schematic (not for CH7003)

This is the pinout for Chrontel chips 7004-7008. Pin 1 can be found through the round mark on the chip. This is mostly the upper left corner if the chip is rotated until you can read the marking. A hint for the soldering. A very fine soldering iron is required. IMHO the best way to solder the wires to the chip is to tin the ends of the wires. Then you place a bit solder fluid on the legs of the chip and solder the wires without additional tin to the chip. It´s easier to solder it to the place where the legs come out of the housing instead on the board.

Pinout for CH7004-7008		red point = Pin 1

At the end let me note it again: Only users with experiences in that stuff should do this. It is really no problem to burn the TV chip to death or to short some legs with tin.

Otherwise have fun with your high quality RGB output! :-)

(c) JB 2002