omegacore
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Joined: Fri Feb 01, 2013 7:57 pm

Smoked HDMI D1

Thu Jun 06, 2013 4:14 am

Hi,

How can I check to see if my hdmi cable was shorted? I am pretty sure my pi D1 is kaput (it looks more like an LED than a schottky!).

Also, does anyone know what I need to order to replace the diode?

many thanks!

also does anyone have any suggestions for getting my pi going headless?

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FTrevorGowen
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Re: Smoked HDMI D1

Thu Jun 06, 2013 8:02 am

omegacore wrote:Hi,

How can I check to see if my hdmi cable was shorted? I am pretty sure my pi D1 is kaput (it looks more like an LED than a schottky!).

Also, does anyone know what I need to order to replace the diode?
This thread may be of some help: http://www.raspberrypi.org/phpBB3/viewt ... =28&t=9819
many thanks!

also does anyone have any suggestions for getting my pi going headless?
If you're running "Wheezy" the ssh server should be running by default. I usually ssh in to my headless Pi's via the (cross-platform) too "PuTTY". FWIW there are a few PuTTY screenshots at http://www.cpmspectrepi.webspace.virgin ... aspPi.html . The main "issue" is knowing/finding out your P's IP address - if it's assigned by your router's dhcp server you may have use its "Web page admin" service to find it out or, change the Pi's setup to use a suitable static IP address.
Trev.
Still running Raspbian Jessie or Stretch on some older Pi's (an A, B1, 2xB2, B+, P2B, 3xP0, P0W, 2xP3A+, P3B+, P3B, B+, and a A+) but Buster on the P4B's. See: https://www.cpmspectrepi.uk/raspberry_pi/raspiidx.htm

LlyrP
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Re: Smoked HDMI D1

Thu Jun 06, 2013 10:18 am

omegacore wrote:Hi,

How can I check to see if my hdmi cable was shorted? I am pretty sure my pi D1 is kaput (it looks more like an LED than a schottky!).
It's an BAT54 Schottky: http://www.onsemi.com/PowerSolutions/pr ... o?id=BAT54

Says there it has a forward voltage drop of 0.35V. It's a generic part and most mfr's BAT54s are somewhere in that range. So hook up a DMM across it, my DMM has a setting for 2000mV, you should use a similar setting.

I found the Pi resets if you hook up with the wrong polarity, but if you get it the right way round your DMM should show 0.35V or somewhere in that ballpark. Mine read 0.24V so give it some tolerance either side. If it reads 0 or off scale high your diode is fried.

BE CAREFUL when poking around there because you're mere MM from the Pi's power circuit
Also, does anyone know what I need to order to replace the diode?
As I mentioned above the BAT54 is a generic part, although I don't know if the board is designed with a specific vendor's part in mind.
Use your own judgement when following any instructions from the forum. I take no responsibility if you fry anything...
--
LlyrP :: http://llyrpenrose.com/

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