Anyone else using LQ035NC111 LCD?

[halleyscomet]

This one was really cheap, but I probably messed up by getting it, because it needs a DC power jack, and therefore probably not possible to get it to work with 5 volts huh.

https://www.aliexpress.com/store/produc ... 15535.html

Here is the data sheet: http://www.datasheetspdf.com/PDF/LQ035NC111/705487/4

if anyone wants to put BIG RED NOOB CIRCLES on this image for me, that would be awesome.

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[halleyscomet]

Hey sorry to bump my own thread.

After some experimentation, we do indeed have power to this LCD, without modifying anything! For the low price, I am pretty happy.

However while the screen does power on (after pressing a button on the control panel) no video is displayed when booting up raspbian.

huh.

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[Zero]

If it's anything like all the other screens out there, you have wired it up incorrectly. Looks like you have connected two video signals at the same time. This guide shows you how to wire it up correctly:

http://www.sudomod.com/forum/viewtopic.php?f=22&t=958

[chaosratt]

Can you provide us with the part numbers of the highlighted components?

[halleyscomet]

Can you provide us with the part numbers of the highlighted components?

like this?

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[halleyscomet]

Also behold this strange flickering after maybe 30 seconds of idle time on the screen.

https://vid.me/4OM7

[chaosratt]

Also behold this strange flickering after maybe 30 seconds of idle time on the screen.

https://vid.me/4OM7

That's pretty much what mine did, turned out to be a power issue. It worked, so long as the voltage was high (5.1+) that the powerboost could pump out, but the nominal 4.8-5.0 that my wall charger output was just not quite enough. Fixed as soon as I bypassed one of the regulators. Give me some time to look up those part numbers and I'll get back to you, or if someone beats me to it.

[chaosratt]

I'm afraid I have no idea how to resolve this for you.

The top two chips are pretty standard linear regulators at 3.3V and 1.8V output respectively.

The left 8 pin chip appears to be an EEPROM if I'm reading it correctly, and I can't find squat about the right one.

On many boards what is required is to remove a filtering chip that looks exactly like the 8-pin ones on the left and right, that is sitting right in front (electrically) of the 3.3 regulator, then feed your 5V directly to that regulator's input, see example. My circuit knowledge simply isn't enough to tell you how to fix it, but I can make one suggestion.

Try (very breifly!) feeding 5v directly to the bottom leg of the 3.3 regulator only, and see if that makes the screen work better. That did the trick on mine, but caused on of the 8-pin chips to get very hot, before another member told me to remove it entirely.