| Electronics > Repair |
| LCD image reversed Line6 Helix |
| (1/6) > >> |
| Audiorepair:
What could possibly cause an LCD to suddenly reverse its image? I have a Line6 Helix here because of this. When I first booted it the boot Splash screen was normal, then after booting it was reversed as in the photo. Now it is always reversed. There is one other instance of this you can find online but no solution. I feel it has to be firmware, though the customer contacted Line6 and they suggested not, and that it was a hardware or ribbon cable issue. I did read an online comment suggesting along the lines that maybe it has somehow got itself into a language mode that writes right to left (Arabic e.g.) This seems to me to be the likeliest suggestion, unless there is some other way this could possibly happen. Interesting nonetheless. |
| coromonadalix:
must be HW issues bad connection some did complain about this and fw updates or downgrades did not recover ... ribbon, bad ribbon insertion ... you have to dismantle it to check the lcd markings if any and get datasheets, could be control lines etc ... https://line6.com/support/topic/24355-flipped-lcd-screen/ unless you're one of thoses who complained on other forums ? |
| Audiorepair:
No I haven't been on any forums about this. So is it possible to do this via a bad ribbon cable or messed up control lines? My head is having a hard time believing this. |
| Audiorepair:
Or another way of putting it is, could you add a hardware function to a LCD that reversed the image like this? |
| Nominal Animal:
It is possible for the LCD controller to have one to three hardware pins to set the display orientation. This would explain why the manufacturer said it is a ribbon cable issue. (Perhaps a Return of the Tin Whiskers, what with lead-free solder and dense connections?) Most matrix LCD and TFT controllers I've seen –– I'm only a hobbyist who interfaces small displays in the 1" - 5" range to Linux-based appliances like routers and such for non-technical users to see the state, without risking changing the settings –– do have commands for rotating and mirroring the display. If only there was more information about the LCD unit, and what controller it might use! The display modules I use have a controller chip embedded in the display or flat flex cable. See for example this 4.3" IPS one from BuyDisplay/EastRising. The chip is on the display module itself, underneath the edge of the display. It directly controls all the hundreds of LCD matrix pins. This particular display uses ST7262E43 controller/driver (datasheet PDF). Although this display (datasheet PDF) does not have orientation pins exposed on the 40-pin ribbon cable, the ST726E43 controller does have exactly such mirroring pins, HDIR and VDIR, on pads 157-161 (two consecutive pads each). I believe most controller/drivers do have such pins, although I haven't verified it. In any case, it's up to the display module manufacturer to decide whether they're exposed on the FFC cable or not. Without knowing the FFC pinout, or the exact controller used on your display module, there isn't much anyone can do to help. The display modules are rarely custom jobs – although there are a lot of variants on the FFC pinouts; I do believe it is not at all expensive to get a run with custom pinout – so looking for any kind of model number information on the display module and its Flat Flex Cable might lead to manufacturer and documentation. |
| Navigation |
| Message Index |
| Next page |