http://www.amazon.com/Component-Video-Stereo-Audio-Cable/product-reviews/B001IUQB2W/ref=dp_top_cm_cr_acr_txt?ie=UTF8&showViewpoints=1
read these reviews. a couple of them really explain well why you may never be able to do it. if I understand what you want to do, anyway.
1. HDMI is digital with pulses and component is analog with waveforms
2. HDMI has 19 pins and component + audio has only 5
3. HDMI has the HDCP copy protection signal whereas there is no component equivalent
4. A cable is a passive device made up of 2 connectors, solder and wires. It cannot convert one digital signal into another analog signal. Help other customers find the most helpful reviews
This is the equivalent of a hose that when connected to any faucet turns that water into wine.
The cable does not convert a digital signal to an analog signal. Big bummer.
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This is a non-standard wiring setup. This setup has routed analog component video through an HDMI socket. HDMI devices normally accept HDMI with digital signals coming in; this cable is not compatible with those (about 99% of the devices). WHERE IT WILL WORK: With devices specifically made to accept an analog signal routed through an HDMI port. These devices are extremely rare, and if you have one, your user's manual will clearly state as much. Unfortunately, because there are a few such devices on the market, there are now "HDMI to Component" cables being marketed in various outlets, and the sellers of these products often do not appear to realize that they will work with only a very small, limited class of devices. Don't buy one just to try out; unless your manual says it will work, it WILL NOT.