vga to dvi converter.... wiring  - Page 1
Forum section: electronics / repair

author: Bumblebee001
author_rank: Newbie
timestamp: November 29, 2019, 09:21:40 pm
content: I am trying to repair this converter for my son as many of the wires on the vga end came apart ie detached from the solder on the board.I am attaching 2 photos hoping they could be of some help.Too many wires, several of same colour and no idea where they are supposed to go. There are solder points on both sides of the small board and are numbered: GND, 16, 11, 10, 6, 4 GND on one side GND, 1,3, 7, 9, 15, 19, 18 on the otherAny help would be appreciated.Regards & thanks in anticipation.

author: Bumblebee001
author_rank: Newbie
timestamp: November 29, 2019, 09:23:18 pm
content: Sorry.... this did not go through

author: Ranayna
author_rank: Super Contributor
timestamp: November 29, 2019, 09:32:28 pm
content: Some of these are still connected to the numbered pads...Can you buzz them out and compare to the pinout from here:http://www.zytrax.com/tech/pc/monitors.htm?I would be surprised if those numbers have a different meaning.

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 29, 2019, 11:13:02 pm
content: you wasted my 10 minutes. that's a dvi 24+1 to vga, not vga to dvi... here's a $5 fix...https://www.ebay.com/itm/1080p-DVI-D-24-1-Pin-Male-to-VGA-15Pin-Female-Active-Cable-Adapter-Converter/183413241658?hash=item2ab447f73a:g:QUcAAOSw899bjMxAsome reference here...https://www.eevblog.com/forum/beginners/home-made-dvi-i-to-vga-converter-possible/msg2696928/#msg2696928

author: Bumblebee001
author_rank: Newbie
timestamp: November 30, 2019, 06:05:16 pm
content: Thank you for your reply and sorry for asking and wasting your time.I think this forum does not seem to serve any purpose then and should close it's doors.... when something is broken, buy new from eBay....Try explaining to an autistic child that to replace a broken item, it can take up to 6 weeks to get the goods from the other side of the world! My child only understands the word "instant" as in now.Have a great weekend.

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 30, 2019, 07:54:45 pm
content: Quote from: Bumblebee001 on November 30, 2019, 06:05:16 pmcorrected, and thats what you think. you can either:1) refer to some links in the provided thread (i'm lazy to regoogle) and study that blurred chip you provided (how long its going to take?)2) next time, be more precise on the topic (dvi to vga, instead of vga to dvi) and provide better focused image to help other members to help you.3) teach people about "reality" that... something is going to take time.. there is no such thing as "instant"i dont know whats your relation to autistism i'm sorry if you have, but we got alot of people who came just to get the answer they want or expected some "all knowing" will answer that nails in, everybody got their bad and busy days "i" should be thankful if my questions even got answered even in a way i dont like, that will make my brain keep working... btw i dont think USA to USA order will take 6 weeks (yeah i searched for item based on your location thank you!), my half globe order will only took 2 weeks average, its probably just on the next door mall (USA got everything unlike me here). and its only $5 i dont think buying new is a bad suggestion unless you have too much boring time to waste reconnecting and studying unknown wires. but if you dont have the guts to even look at the diagram linked, then i dont think you have much anywaymoney... brain.. pick one... sadly time (instant) is not an option, bad for us, not just you. cheers.edit: sorry i thought you are in USA, either my mistake or you changed your flag or i was confused that bumblebee was made in america.

author: Bumblebee001
author_rank: Newbie
timestamp: November 30, 2019, 08:33:02 pm
content: Some facts:No... I never claimed to be American. I am Maltese and always have been.I am a medical doctor by profession, on the doorstep to retirement. Until then I have little time to work out which wires go where... and often can''t until I open up the other end to see where these wires come from. Chances are I will do more damage that will make the issue worse.I have very basic knowledge on electronic stuff enough to effect some repairs, sometimes. I try to ask (not often I do this... usually when I get desperate) lest there are simpler, more straight-forward solutions than what I imagined.I try not to throw away and repair is always my first option.... Besides not wishing to spend more money on crappy things being produced now-a-days, I'd like not to be a contributor to the piling junk polluting our planet.I already ordered another converter which I don't expect to receive for some weeks and this one will be another item to add to my pile of electronic goods which I keep hording in the hope that some day I might decide to take up the issues causing them to cease up.

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 30, 2019, 08:39:37 pm
content: what you are seeing there is an active converter, and probably the crappy hung low too. the dvi signal goes to a chip, and then spit out vga signal, that chip is unknown to us since its blurred. given the time i have here, even if i know what chip it is, i will probably just buy another one. even if you know that chip it is, you'll still need to study dvi diagram provided by members here anyway which color goes to where.

author: mariush
author_rank: Super Contributor
timestamp: November 30, 2019, 09:19:24 pm
content: The chip is AG6200 / AG6200A and datasheet is not available.What you can do is get the pinout for the DVI connector:https://en.wikipedia.org/wiki/Digital_Visual_InterfaceHere's a zoomed picture:https://upload.wikimedia.org/wikipedia/commons/thumb/6/65/DVI_pinout.svg/1869px-DVI_pinout.svg.pngYour converter is DVI Single Link so you only have the LEFT green set (3 pairs of wires) plus the bits on the other side (dcc clock and data maybe, 5v and ground and hot plug detectUse a multimeter to figure out which wire belongs to which pin on the DVI and from there, you can kinda figure out (- and + of each pair should be close together on the pcb, probably one on each side of the pcb or right by each other)... the shielding will also help you out, the pairs would be shielded separately... , 5v should power the chip... dcc data and dcc clock should go to vga SDA (data) and VGA SCL Clock (pins 12 and 15:https://pinouts.ru/Video/VGA15_pinout.shtml)... possibly pass through, so you could use a multimeter in continuity mode to see which pads are those...

author: Renate
author_rank: Super Contributor
timestamp: November 30, 2019, 10:48:57 pm
content: Quote from: mariush on November 30, 2019, 09:19:24 pmAw, I was going to say that.The numbers on the PCB are for an HDMI connector.To connect it to a DVI connector you have to use your secret decoder ring!Code:PCB DVI Signal--- --- ------1 2 Red+3 1 Red-3 Red Gnd4 10 Green+6 9 Green-11 Green Gnd7 18 Blue+9 17 Blue-19 Blue Gnd10 23 Clock+12 24 Clock-22 Clock Gnd15 6 SCL16 7 SDA18 14 5V15 Gnd19 16 DetectWas there an error in the number list? I think that the "11" was actually a "12"?

author: Renate
author_rank: Super Contributor
timestamp: December 02, 2019, 02:21:45 pm
content: Ok, in detail...Have you got a DVM, ohmmeter? One that beeps on continuity would be easiest now.Print out (or copy) the table above on a big piece of paper and sit down with a pen.Start with the pad on the PCB labelled "1".Is there a wire still attached? If so, write the color on the sheet, if not notate it.Check to see if there is continuity from that wire to the pin on the DVI connector.The DVI pins aren't so easily numbered, you have to look at the diagram to see which one it is.Does the connected pin agree with the chart?Do the same for the rest of the pads on the PCB.Now you have leftover wires, check where they are going to on the DVI connector.When you're all through does the chart make sense?You've got two choices here now.You can try to reconnect the ripped out wires just as they are.Or you can cut them all off, strip another inch or so of the jacket off the cable and start fresh.

author: Bumblebee001
author_rank: Newbie
timestamp: December 02, 2019, 02:50:04 pm
content: Hi Guys,Thanks for your more positive replies. I have printed the pin details out. I do have 2 basic digital meters. I'll experiment when I have my next day off. I am recovering from a "chest cold" and don't have the energy to do anything at this time. I will report back on my success or failure or in case of difficulty.Yes.... doctors do get sick too!

author: andy2000
author_rank: Frequent Contributor
timestamp: December 02, 2019, 04:44:45 pm
content: Is there any reason you need an active DVI digital to analog VGA converter? This is more commonly done with a DVI-I to VGA passive adapter. As long as your source device has a digital + analog DVI-I port, then you should be able to use a passive adapter. They're cheap, and will be available locally. You might even have one since they were usually included with video cards and computers until fairly recently.

author: Bumblebee001
author_rank: Newbie
timestamp: December 02, 2019, 08:41:27 pm
content: Since I don't know much about the various adapters and inputs and outputs of various computer hardware, I never asked the pertinent questions to my son and the equipment is not readily accessible to see for myself.