HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1024x

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cbids
 
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HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1024x

Post by cbids »

Order#757748
Display is not receiving HDMI signal from both a Mac or a Raspberry Pi with all modifications to config.txt as listed in:
https://www.adafruit.com/products/2395? ... AhHT8P8HAQ
https://learn.adafruit.com/hdmi-ubergui ... n-1024x600
Please find screenshot of the board attached. Would appreciate an early response since this is required for a prototype.

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Franklin97355
 
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Re: HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1

Post by Franklin97355 »

Please find screenshot of the board attached.
Please attach and if you could let us know if you have tried another HDMI cable and what you are using for a power supply it would help.

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cbids
 
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Re: HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1

Post by cbids »

I HAVE tried with another HDMI cable.
I see an error in trying to attach the picture to my post. So I emailed support@adafruit and heard
back from Kelly. Do you have access to that picture from her? Or is there any other way I can send it to you?
I'm using this power adapter: https://www.adafruit.com/products/63.

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cbids
 
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Re: HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1

Post by cbids »

One more thing to add. The display did show Raspbian shell prompt for a few seconds when I first tried to HDMI from a pi2 but subsequently that stopped working. The pi2 is able to power a TV monitor.

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Franklin97355
 
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Re: HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1

Post by Franklin97355 »

You can post .jpg and .png files here up to 1meg in size 800x600 works well or you can post it on a sharing site and post the link here.

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cbids
 
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Re: HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1

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adafruit2
 
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Re: HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1

Post by adafruit2 »

ok lets start from the begining, using a raspberry Pi:
first up, make sure the TFT is solidly connected into the slot, with the flex part plugged all the way in, there's two ears on the side, make sure those are snapped down and holding the tft in solidly.

next up, without anything connected to HDMI, but powering up, do you ever see a blue or black screen with "HDMI" or "VGA" in the corner, or "NO SIGNAL" or anything on the TFT?

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cbids
 
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Re: HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1

Post by cbids »

'NO SIGNAL' is displayed when HDMI cable is not connected as what one would expect BUT ALSO after cable from p2 is connected.
Here's a video(128 MB) showing the problem:
https://drive.google.com/file/d/0B-EH5d ... sp=sharing

If the problem cannot be resolved today, we want a working replacement to be sent as soon as possible. Thanks!

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adafruit2
 
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Re: HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1

Post by adafruit2 »

OK The TFT is fine, did you press the button on the control board to switch to HDMI input?

https://learn.adafruit.com/hdmi-uberguide/keyboard

it has to be set to HDMI input, it should say HDMI in the corner

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cbids
 
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Re: HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1

Post by cbids »

Hi,
Yes when I set the input button to HDMI, the display worked just fine.
But the button is not labeled as input(wrong revision sent to end customer?) and this cost me several hours and an important deadline.
Anyway, thanks for helping resolve.
Btw, is there anything additionally I need to know about the touchscreen in terms of calibration, debouncing, improving sensitivity?

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adafruit2
 
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Re: HDMI not working : HDMI 4 Pi: 7" Display w/Touchscreen 1

Post by adafruit2 »

glad we were able to fix it so fast! :)

https://learn.adafruit.com/ar1100-resis ... the-ar1100
has a lot about the touch screen controller

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