3.5 inch LCD problem
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3.5 inch LCD problem

by 1codis on Sun Aug 26, 2012 11:48 am

I'm having a problem with my LCD. I apply power, but the board on the back gets incredibly hot and the screen does not power up. I have tested it under multiple voltages, all between 6 and 12 volts, and ample current is supplied. Polarity is correct in every case. What should I do? If it cannot be fixed, can a replacement be arranged?
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Re: 3.5 inch LCD problem

by adafruit on Mon Aug 27, 2012 4:06 pm

we do test the boards before shipment - can you post a photo showing exactly how you are powering it?
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Re: 3.5 inch LCD problem

by 1codis on Sat Sep 01, 2012 4:04 pm

Sorry for the blurry pictures! Here's an explanation: The red wire from the LCD is connected to the positive terminal on my supply. The black is connected to ground. The power supply is supplying 9V at 2A max. I've tested this time and time again, and recently, a small IC on the back has been smoking. Also, after closer inspection, I noticed one IC on the back is severely scratched. Pictures are included.

Power Supply:

Image

Connections:

Image

Scratched Chip #1:

Image

Scratched Chip #2:

Image


What should I do? Can a replacement be arranged?
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Re: 3.5 inch LCD problem

by adafruit_support_bill on Sun Sep 02, 2012 6:19 am

Can you get a clearer photo of the chip in question? More light usually helps. Try near a window or even outside.
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Re: 3.5 inch LCD problem

by 1codis on Mon Sep 03, 2012 7:24 pm

Hopefully this is a bit better....if you look closely, you can see indents in the chip. The last picture is one of the small IC that smoked, it's the one with the large bubble in the middle.

Image

Image

Image
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Re: 3.5 inch LCD problem

by adafruit_support_bill on Wed Sep 05, 2012 6:02 am

Still can't see any detail in the photos. You are probably closer than the minimum focus distance for your camera. Try backing up a bit. Better to have a smaller in-focus image than a large fuzzy one.
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Re: 3.5 inch LCD problem

by 1codis on Thu Sep 06, 2012 8:29 pm

Just found a better quality camera, hope these are better!

Scratched chip:

http://imgur.com/2LBhd

Bubbled:

http://imgur.com/Mpqy9

[Edit - moderator - fixed image links]
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Re: 3.5 inch LCD problem

by adafruit on Fri Sep 07, 2012 10:08 am

the regulator definately popped - do you remember smelling something burning when you plugged it in?
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Re: 3.5 inch LCD problem

by 1codis on Sat Sep 08, 2012 1:13 am

Yes, definitely. But as earlier stated, all power specifications were correct, no debris was near to short the board, and the power leads were not shorted. What can be done?
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Re: 3.5 inch LCD problem

by adafruit on Mon Sep 10, 2012 10:05 pm

We can replace it this time - email support@adafruit

but please be very careful! - we test every single TFT board here with a proper power supply and video input - so its very likely you accidentally connected something backward/wrong :(
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