dead display?

adamjansen · Post by **adamjansen** » Mon Sep 08, 2003 7:04 pm

I recently purchased an LK204-25WB, and am quite pleased with it. However, after playing with it successfully a few times, it suddenly and inexplicably doesn't work. I can't even get it to power up. I've made all the proper connections, and have a power supply with proper voltage and sufficient current.
It's possible that I'm overlooking something, but I think I'm dealing with a dead display. I've had it hooked up and working before, and I don't think I'm doing anything differently now that would make it not work.
I haven't noticed any smells or heat on any of the chips, the thing is just dead, no flicker, or anything.
Any ideas?

Miles · Post by **Miles** » Tue Sep 09, 2003 9:01 am

Hello...

Do you happen to have a multimeter handy...?

adamjansen · Post by **adamjansen** » Tue Sep 09, 2003 9:07 am

Sure, I've got a multimeter. What do I need to check?

Miles · Post by **Miles** » Tue Sep 09, 2003 1:38 pm

What is your input voltage?

adamjansen · Post by **adamjansen** » Tue Sep 09, 2003 3:26 pm

input voltage is 5.05 V, steady.

also, total current to the display starts at 55 mA when you power it up, but slowly drops to about 52 mA.

So something's using current...

Miles · Post by **Miles** » Wed Sep 10, 2003 11:22 am

What is the voltage of pin#2 of the strip header connecting the PCB with the display? On the display size it will have the pinout...

adamjansen · Post by **adamjansen** » Wed Sep 10, 2003 6:57 pm

for that header, voltages are as follows:
PIN : VOLTAGE
===========
1: GND
2: 5.0 V
3: 3.3 V
4: 3.0 V
5: 3.2 V
6: 3.0 V
7: 3.1 V
8: 3.1 V
9: 3.3 V
10: 3.1 V
11: 3.4 V
12: 3.4 V
13: 3.4 V
14: 3.5 V
15: 5.0 V
16: 3.0 V

Miles · Post by **Miles** » Thu Sep 11, 2003 8:46 am

Can you email me at myero@matrixorbital.com and we can discuss RMA options...

dead display?

dead display?

voltage on header