| Electronics > Repair |
| LCD image reversed Line6 Helix |
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| Nominal Animal:
--- Quote from: Audiorepair on October 22, 2024, 03:04:39 pm ---Photo of LCD markings. --- End quote --- The display module is a 6.2" 800x480 HannStar HSD062IDW1-A00 (also known by 721CR60012-A0, apparently relatively common in automotive applications) with a 60-pin FFC. Good news: you can get a replacement one from Aliexpress and eBay for about 20€. All HSD062IDW1-Axx models should be interchangeable by what my searches indicate, but do check carefully for yourself; I'm often wrong. (Don't let my writing style fool you into thinking I'm a pro; I'm just an uncle bumblefug hobbyist.) Even better, I located a datasheet. The problem is pin 35 in the FFC, SHLR. It is right next to pin 36 (digital supply). I'm willing to bet pin 35 should be grounded, but somehow pin 36 is making a tiny contact to it. Pin 1 and pin 60 should be marked on the FFC, but if not, the RGB data is on pins 4-27; i.e. the end with many parallel data lines has pin 1. What I would do, is disconnect the display (when the device is disconnected from mains and not powered on!), and check the continuity between pin 35 and 36 with a digital multimeter in Ohms/resistance mode; and between pin 35 and pin 38 (digital ground). Pin 37 is the UPDN, i.e. vertical mirroring. If you are very, very lucky, it is just slightly shifted FFC within the connector, and reinserting the FFC will fix the image. Or that you can see some discoloration or suspiciously sharp-looking tinning on pads 35 and 36, and some light, very careful scraping with a scalpel can fix it. Otherwise, the fix is a bit difficult, as you need to find where the unwanted connection is –– or just replace the display. I am hoping it is in the connector end of the FFC cable, and not in the display side. |
| Audiorepair:
Well there you go. Oh me of little faith. |
| Nominal Animal:
Fixed it by re-seating the FFC in the connector? So pin 35 is no longer contacting pin 36? |
| coromonadalix:
--- Quote from: Nominal Animal on October 22, 2024, 05:33:13 pm ---Fixed it by re-seating the FFC in the connector? So pin 35 is no longer contacting pin 36? --- End quote --- could be ... maybe there was some pins shift in the socket, theses fpc are very narrow, 0.5" pitch i think, even a bad insertion could deform the flex pcb traces etc ... bad connection, or badly clamped socket holder / snap / lock time will tell |
| Nominal Animal:
The FFC is 60-pin, 0.5mm (0.019685") pitch, so very, very dense at the connector, which has individual contact pins/springs. At the middle of the FFC, the distortions are greatest (the connector slot is very precisely the same width as the FFC), so it is no wonder pins 35 and 36 (of 60) can sometimes overlap a tiny bit – even from say thermal cycling, I'd guess. The contact itself can be minuscule, since pin 35 is just a logic level high impedance input pin, and pin 36 is one of the digital supply voltage pins. Depending on the contact materials (ENIG, or just lead-free tinned), tin whisker is an actual possibility here too. It would be very nice if OP would inform others having the same issue how they themselves solved it and how it may occur... You know, pass the help forwards. |
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