Hi Ein' Tried to open the schematics, but Altium doesn't appear to recognize them.EiNSTeiN_ wrote:hello forum,
I have a significant number of LCD panels from old laptops, so I was disappointed when I saw that the r-pi didn't have an lvds output. Given the fact that we don't (and probably won't) have access to the gpu docs or drivers source code, I have doubts on just how straightforward it will be to use the onboard DSI connector.
So I made this today, it's an hdmi to lvds adapter: http://g3nius.org/hdmi-to-lvds.tar.gz
This is an early board design, there are a couple things I haven't worked out, so it will definitely change before I have it produced. I wanted to share this sooner rather than later. It would be great if anyone with electronics knowledge could review the schematics. I made this in an afternoon so more pair of eyes won't hurt.
It works using 2 ICs, the first one is a hdmi receiver and the other one is an LVDS transmitter. between them there is 3 x 8-bit color channels, or 24 bit total. The LVDS transmitter has several modes, the one I used will be compatible with 18-bit displays aswell as [some] 24 bit displays. According to the datasheet, it will be compatible with only a minority of 24-bit capable displays but this is fine since I mostly have 18-bit LCD displays available.
The current BOM should cost in the area of 25$ for a single unit. The main IC on there is the ADV7611 which cost 15$ at digikey. It may be possible to sample the other IC from Texas Instrument and save 7$.
Looks good, but "Out of stock", also check comments, it looks like hard to get (expensive shipping).tncat wrote:http://www.chalk-elec.com/?page_id=1280 ... d=14647633
I actually did something along these lines, but it's hardly reproductible. It was a sort of "scrapheap challenge" project for me.rhm1 wrote:Has anybody tried to take a HDMI / VGA to LVDS circuit board from a LCD TV that has a broken LCD and hook this up to a laptop display?
Yes, it took many hours, but it was fun. I will keep hacking it from time to time until I get a reasonable solution. Then, I estimate a week should be enough to rebuild it in a better looking shape.rhm1 wrote:It looks as though you have put a lot of time and effort into this. One big problem that may occur with a project like this is matching up the right lcd to what the controller can handle.
Not sure yet...uberdaff wrote:Nice!
Does it work?
Hi Ceteras,ceteras wrote:So far, my pcb looks like this, but still there's a lot of work to be done.
I think I will update the image as work is progressing.
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