DVI-D to HDMI diy cable (hot plug/5v use, cabling)

[datnoz]

Hello,
I recently got a very old pc with an ATI X1950 pro gpu, that only outputs shitty S-Video and DVI-I, but I only have hdmi screens availiable.
So i started to make a DVI-D single link to HDMI cable using, well, an hdmi cable and a dvi-d cable.
But now i'm stuck at the 5v/ hot plug detect part of the connectors (as of now, i've not soldered the cables together, but the individual cables are labeled and unused like cec or hec are cut).
The HPD pin 18 on the DVI connects to the pin 19 of the HDMI, but from what i understood, the 5VDC goes from the source to the screen, but chatgpt told me to not connect the 5VDC pins together (other forums too, but like a 50/50 from my googling).
Since the 5v is sorta used for the hot plug detect and EDID features, wouldn't it makes sense to cable the 5vdc out from the source to the screen ?
Or it could "start a fire on the screen pcb" or something like chatgpt said ?

 

[Dr. Dro]

You're doing what!? Get a professionally made DVI to HDMI cable, man. They are not very expensive.

 

[Onasi]

…brother, it’s less than 10 bucks. It’s old solved tech. Any generic one would do. Literally not worth the time and DEFINITELY not worth the risk to your health.

 

[StViolenceDay]

If you're really interersted in producing DIY cable:

DVI/HDMI cables has 5V going through. It is powering EEPROM containing EDID (and may be used for something other). So 5V pins on its ends must be connected to each other.

AI got confused with DisplayPort cables - the Displayport cables indeed must NOT have pins 20 connected to each other (DisplayPower used only for convertres, not for sinks)

Also there is a very important note: double-check that cables sheilds/"outer-cases" are firmly connected, providing that during the plug "the GNDs of devices are first connected during insertion". Failing to achieve this may burn devices on both ends. This ensures that initial "electical potential disbalance" is compensated via GND connection, not via sensetive signal connection.

 

[eidairaman1]

Dual link dvi-i to hdmi adapters exist, iirc x1950 pros came with all the pins

https://www.amazon.com/Dual-Link-Adapter-Converter-Playstation-Gold-Plated/dp/B07ZG5NKDJ

 

[datnoz]

Hello, i've done the soldering, connecting the 5vdc together.
It's all good, nothing burned.
Thanks for the help.