Dead HDMI

[Mamvcivm]

Hello, I once accidentally connected the wrong hdmi lead into my Pi. Instead of the one connected to my TV, I connected the one from my PC. Since then, I get no output from the Hdmi connection. Other than that, the Pi works perfectly, obviously using the s-video output.

I have since bought a second Pi which works perfectly (through hdmi) on the same TV, so I know the problem isn't the tv or the cable.

My question is, is there any way to troubleshoot the hdmi output? Is there any diagnostic software I can run?

Thanks,

Andrew

[GTR2Fan]

My question is, is there any way to troubleshoot the hdmi output? Is there any diagnostic software I can run?

I don't think it would help much if there was as it all comes straight from pins on the BCM2835. It might be worth checking the protection diodes I guess. That's D14, 15 and 16 on page 2 of the schematic.

http://www.raspberrypi.org/wp-content/u ... .2_027.pdf

[Methanoid]

My question is, is there any way to troubleshoot the hdmi output? Is there any diagnostic software I can run?

I don't think it would help much if there was as it all comes straight from pins on the BCM2835. It might be worth checking the protection diodes I guess. That's D14, 15 and 16 on page 2 of the schematic.

http://www.raspberrypi.org/wp-content/u ... .2_027.pdf

I have a B with apparent dead HDMI (works fine composite). I have tried all the Force HDMI stuff and no joy. I have a digital MM and found this guide which says how to test diodes. http://en-us.fluke.com/training/trainin ... meter.html But (sorry, noob alert) how do I test the Pi diodes which have 3 connections

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which do I connect the red and black prongs to? and if a diode is the issue, any ideas where I can get identical replacements? I can find a friend who can do the replacement I hope.

[Methanoid]

No-one able to help?

[Burngate]

Does this help?

From the data sheet https://www.fairchildsemi.com/datasheets/BA/BAV99.pdf

BAV99.png (11.74 KiB) Viewed 995 times

Treat it as two separate diodes.

[Methanoid]

Does this help?

From the data sheet https://www.fairchildsemi.com/datasheets/BA/BAV99.pdf

BAV99.png

Treat it as two separate diodes.

Very helpful... but I am still stuck. All diodes seem to work (they all pulse with a number (1400-1800) before dropping to 1.... I assume that means they work?

[mahjongg]

This means they seem to conduct current, but if they have turned into a molten blob of silicon they would conduct current too!
the trick is, if you reverse the polarity of the test leads will they bar the current too?

Is there any diagnostic software I can run?

run any software that should generate a HDMI picture, if no picture appears then HDMI might be broken (what did you expect?)

IMHO you have damaged the HDMI port beyond repair.