Raspberry Pi Lab

Tag: hdmi

More On The /boot/config.txt File

by on Dec.29, 2013, under Installation, Troubleshooting

Well, I have the /boot/config.txt file working!

Once I figured out the problem was the /boot/config.txt, I knew I could go back to my original plan of using Occidentalis on the RPi.  So I re-flashed an 8Gb SD card with the Occidentalis image and mounted it on my laptop.

Navigating to the /boot/config.txt file, I made the following changes…

disable_overscan=0
hdmi_force_hotplug=1
hdmi_group=2
hdmi_mode=46
hdmi_drive=2
config_hdmi_boost=4

Obviously, there is more in the file than that, but you don’t need me to post all the comment lines.  These are the lines that are left after removing all comment lines.

BE CAREFUL…Read the documentation for your specific monitor AND check out the config.txt resource link I posted in my previous article.  The group and mode lines are specific to your monitor’s resolution and timing.   See that previous article here.

 

 

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Great Resource for the config.txt file

by on Dec.29, 2013, under Installation, Troubleshooting

Here is a great resource for configuring the config.txt file…

http://raspberrypi.stackexchange.com/tags/config.txt/info

 

 

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NOT A Hardware Problem

by on Dec.29, 2013, under Installation, Troubleshooting

I, now, know for certain that my problem is NOT hardware.

I loaded Raspbian on an SD card and modified the /boot/config.txt file to enable  the force VGA option.  So the display “works.”  The resolution and alignment aren’t right, but I’ll work on tweaking that out.

When I get it working correctly, I’ll post my /boot/config.txt file.

 

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Confused?

by on Dec.27, 2013, under Installation, Troubleshooting

So I tested the HDMI output on the RPi by connecting it to the HDMI cable coming from one of the regular computers to a television.  There is nothing wrong with the RPi.

Re-tested the HDMI to VGA converter on the same television and it works also.

Recall, from my previous posts, I already tested the monitor on the iPad’s VGA adapter.

So if the RPi works and the HDMI converter works, and the VGA cable works, and the monitor works, then why don’t they all work together?

Back to the thinking box!

 

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Flaw In My Logic

by on Dec.26, 2013, under Installation, Troubleshooting

Although I am fairly confident in my conclusion that the HDMI to VGA converter I was using is, in fact, defective.  However, it occurred to me that my logic has a flaw.  I could be the HDMI converter, but it could also be the HDMI port on the RPi itself.

When I got the RPi up the first time, it was via the composite video port — not the HDMI.  Therefore, not all variables have been eliminated.

I will devise a test to verify both the HDMI port on the RPi and the HDMI converter and post the results.

 

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Troubleshooting My First Install

by on Dec.26, 2013, under Installation, Troubleshooting

debugging-computer-transparent-tightWell, the instructions I detailed in my previous post were correct and worked as intended.  The procedure I followed was NOT the problem.

To trouble shoot, I first verified the image was flashed to the SD card correctly by re-flashing the same card.  But when that didn’t produce a different result, I decided to test the micro-SD card adpater by trying the flashed mico-SD with all four of my adapters.  But no luck there either.

Next I decided to try a different micro-SD card.  I have a couple of 8Gb micro-SDs to I grabbed one of them and flashed it with the same procedure I detailed in my previous post.  When I tested that SD on the RPi, I could see a different result on the board.  In addition to the solid red LED that was there in the previous tests, I could now see a flashing green LED.  I’ve been around computers long enough to recognize the flashing of the green LED as boot up activity.

However, there was still no result on the monitor.  The next step was to test the monitor.  The monitor and VGA cable tested ok by connecting to my iPad.  So I took the RPi over to the TV and pulled the composite video from the VHS.  With the composite video connected to the RPi it booted into Occidentalis.

Conclusion…  My initial install had a bad 4Gb micro-SD card AND a bad HDMI to VGA converter.   How’s that for bad luck?  Hmmm?

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