2.2" TFT Problem - White Screen

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cmardhead
 
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2.2" TFT Problem - White Screen

Post by cmardhead »

Hello all,

I'm new to the forum and Arduino. Please forgive my ignorance in advance. :)

I've searched through the forum but could not find anything specific to my problem really. I just bought the 2.2" TFT display but seem to be having some problems getting it to work. I'm running this on an UNO.

When I load up the example in the Adafruit_HX8340B library, "hx8340b", the backlight comes on it looks like, but nothing ever happens - it's just a blank white screen. I've wired the display up as referenced here:
http://learn.adafruit.com/2-2-tft-displ ... he-display

I've installed both the HX8340B library and the GFX library. The example sketch compiles fine (found the post on downgrading to 1.04) and transfers to the Arduino fine. But I get the white screen. I've tried it on two different UNO's that I have - both work with my other projects - but get the same result.

Any ideas? I've uploaded some pictures to show what I have so far. Any help would be greatly appreciated!
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626pilot
 
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Re: 2.2" TFT Problem - White Screen

Post by 626pilot »

Looks like the MISO pin is not connected to anything. Without that, half of the serial protocol it needs to function will not be there.

cmardhead
 
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Joined: Wed Mar 26, 2014 6:56 pm

Re: 2.2" TFT Problem - White Screen

Post by cmardhead »

Cool, appreciate the reply. It is definitely not connected you are correct. But in the instructions in the link I have in my original post, it says to not worry about that pin (Skip it) - it is for interfacing with the SD card...? I am not currently using the SD card.

Also, I had some wires backwards in my pictures. I had disconnected everything when I could not get it to work and reconnected when I took the snapshots. Anyways, I corrected that and it still does the same thing - just white screen. I am pretty sure I had it correct when I first had it hooked up, I checked the wiring many times.

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adafruit_support_mike
 
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Re: 2.2" TFT Problem - White Screen

Post by adafruit_support_mike »

It sounds like you might be seeing a timing issue with the display driver. It's a hardware thing that happens rarely enough we've never been able to reproduce it on our own hardware. We know it happens though, so let's try a new TFT.

Send a note to [email protected] with a link to this thread and the folks there will help you.

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normlane
 
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Re: 2.2" TFT Problem - White Screen

Post by normlane »

The tutorial for 2.2 " TFT display is for the discontinued 8340. It links to the 8340 library which doesn't work with the 9340 display now shipping.

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normlane
 
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Re: 2.2" TFT Problem - White Screen

Post by normlane »


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normlane
 
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Re: 2.2" TFT Problem - White Screen

Post by normlane »

I can read the number in your picture. You have a 9340.

cmardhead
 
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Joined: Wed Mar 26, 2014 6:56 pm

Re: 2.2" TFT Problem - White Screen

Post by cmardhead »

Thanks very much for the responses guys!

NormLane, appreciate it, I definitely was not using the correct library. I got the 9340 library installed and tried the "graphicstest" example, but am getting the same result - blank white screen.

I will email support (thanks for that Mike) and post back here with what they find.

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adafruit2
 
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Re: 2.2" TFT Problem - White Screen

Post by adafruit2 »

don't forget you need an extra D/C - check the sketch for the precise wiring info!

cmardhead
 
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Re: 2.2" TFT Problem - White Screen

Post by cmardhead »

Got the replacement display in today, adjusted the wiring to reflect how the test sketch is written and.... voila, works! However, when plugging the old display in, same thing, blank white screen. Definitely something up with the original display.

Think I will call this case closed. Thanks to all for your replies and input, and thanks to Adafruit support for the quick turnaround on replacement.

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