Gallery, Projects and General > The Design Shop
Making IR optics.
S. Heslop:
Had a closer look at the curcuits and connector and it only seems 2 of the pins are connected. Kinda weird they used such a connector but maybe it's not as custom as I though. The boards are a multi-layer affair and I couldn't trace the traces to figure out where they went.
The back specifically says "Input voltage 12V-30V = (DC)". I wonder if that means it'll accept anything between 12 and 30 volts. That seems like a wide range. If I work the courage up I could shove in 12 volts and see what happens. I at least know which pin is ground and positive now.
S. Heslop:
Always another problem... Could just be a loose cable somewhere. But at least it seems to just be the display at fault. I tried to tare it but my desk is so wobbly it couldn't get a stable reading.
S. Heslop:
The problem was easy to find. Looks like this pin has bent and also torn it off the PCB. I'd solder in a bodge wire, but continuing the theme my soldering iron doesn't work any more. I guess I might go buy a new one tomorrow.
S. Heslop:
It didn't work. I spent a while making sure I hadn't shorted anything. I guess the problem must be in the LCD itself. The whole modules (LMG7380QHFC) are quite expensive at around £120. Looking at the data sheet it seems theres a LC7942N OFU2 responsible for the horizontal pixels. My best guess, as an idiot with no clue, is that replacing that could solve the problem. Or it could be something inside the module like a ribbon cable coming loose.
The weight is still perfectly readable with the screen in this condition but i'm keen to try fix it for its own sake, even if i'm risking making it worse. But at least the screens are available if I really muck it up.
S. Heslop:
I decided it was probably unlikely the chip had gone and the most likely cause is the ribbon cable between that circuit and the LCD itself.
So I carefully removed it and... ay caramba.
Seems like alot of the conductive scub from the ribbon cable has come off and there's not alot of cable left to work with.
This stupid module is built like calculators I remember pulling apart as a kid, with that big conductive rubber lump that's difficult to re-align. I don't know enough about these things to really pass judgement, but i'm not convinced this is worth £120 or being called 'industrial'.
Thing's are looking up. I think i've at least found the real source of the problem! I just need to read up how to work with these sorts of ribbon cables. I might be able to extend the existing one a bit with some more cable, or there could possibly be just enough material left to try re-attach it.
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