First post, by RayeR
I'm thinking about buying a new 4k monitor and as I browsed the portolio I was disappointed that all new monitors dropped the analog VGA/DVI-I input to be able to connect an old computer. I simply don't have enough space on the table for 2 monitors so I'd like to use one for all with some converter. I found some cheap VGA2HDMI adapters but I got some user experiences that are not much positive about them (some resolutions/refresh rates are not supported or cannot operate with some monitors). Here's one that could be better from cheap ones: https://www.amazon.de/gp/product/B00IJBOMN8/r … sc=1&pldnSite=1
but still some problems reported.
On the opposite side there are well known scalers like OSSC and Framemeister that use expensive FPGA chips so the price is high. And they seems to be primary aimed on consoles and low-res 8bit computers. I even cannot found what is the maximum resolution of VGA input on OSSC.
Currently I don't need more than one VGA input. So I was thinking how about to reuse a control board from an old LCD monitor - the price is 0 as they are lying tons on scrapyards. I have one from BenQ FP73G (17" 1280 x 1024) with DVI+VGA. It's based on Realtek RTD2523B that is well documented: https://datasheetspdf.com/pdf/721071/Realtek/RTD2523B/1
I cannot find the schematics of FP73G but found a similar one FP92W with the same chip
http://elektrotanya.com/benq_q9w5_fp92w_9j.l2 … p/download.html
I just need to know where to connect a power supply and control buttons to swith it on.
The output is LVDS for flat panel. So I try to make a simple converter board from LVDS to HDMI with chip ITE IT6263FN. It can be bought on ebay/ali for a few $. The documentation is worse. I have only 16-pages brief datasheet without registers and programming description. It is available only on CSDN: https://download.csdn.net/download/liangzuoyang/11268290 - anybody can download from there?
Fortunately there's some Linux driver that documents a lof of registers (the chip is used on some iMX8 dev.boards).
So if all will go the rigth way I could be connect it to HDMI monitor and it should behave the same as original BenQ monitor from VGA side - should accept all common VGA/SVGA resolutions. Then I could replace Realtek RTD2523B with a kind better RTD2660 that has also composite video input as a bonus and make it on one compact board. I'd like if someone could share experiences with such video chips - it's quite new topic for me...
Gigabyte GA-P67-DS3-B3, Core i7-2600K @4,5GHz, 4GB DDR3, 128GB SSD, GTX670(GF7900GT), SB Audigy + YMF724F + DreamBlaster combo