Hi everyone,
I've a PCB with an AD8194 and AD9880. The AD8194 mux is connected to a DVI and HDMI connector.
I've a trouble with the AD8194. The AD9880 doesn't detect signal with some DVI sources like personal computers.
If I remove the AD8194 and I do a bypass with some wires, the AD9880 detects the video source. Please, could anybody help me?
Thank you
Best regards
Jose
Hi Dave,
I have replaced the AD8194 and the result is the same.
In fact I've probed DVI with several tft monitors and the result is the same in all of them. I can't see image on the screen. I only see image if I remove the AD8194
I think you're right, the sources of DVI are damaged
I've measured the source of DVI in other PC with problems and the results are:
CLK+ it's ok (The AVcc and Vswing are right)
CLK- it's ok
TMDS 0+ it's ok
TMDS 0- it's ok
TMDS 1+ it's ok
TMDS 1- it's ok
TMDS 2+ it's ok
TMDS 2- it's wrong. I have a countinuous 3.3v more less
I attach some images of the measures before and after of AD8194
I don't understand why the AD9880 works fine if I remove the AD8194? It's a bit strange
Thank you
Regards
Jose
Hi Dave,
I have replaced the AD8194 and the result is the same.
In fact I've probed DVI with several tft monitors and the result is the same in all of them. I can't see image on the screen. I only see image if I remove the AD8194
I think you're right, the sources of DVI are damaged
I've measured the source of DVI in other PC with problems and the results are:
CLK+ it's ok (The AVcc and Vswing are right)
CLK- it's ok
TMDS 0+ it's ok
TMDS 0- it's ok
TMDS 1+ it's ok
TMDS 1- it's ok
TMDS 2+ it's ok
TMDS 2- it's wrong. I have a countinuous 3.3v more less
I attach some images of the measures before and after of AD8194
I don't understand why the AD9880 works fine if I remove the AD8194? It's a bit strange
Thank you
Regards
Jose
