Hi All, Recently I bought a board, but unfortunately lately I realized that my touch screen is not working at all. I flashed the default images of windows and linux but it didn't work. But my LCD works perfectly. Is there any possible way to check if the processor is malfunctioning one, or the touch screen? Some way using resistors to short the pins to see if it moves the cursor. Thanks John
I am not a native speaker of English, so I am really sorry for my bad English.
John, "touch screen is not working" and "LCD works perfectly" I assume you mean the image is displayed but you can not move the cursor with a mouse and/or stylus? Does the stylus move the cursor?
John, I suggest you check out this thread: http://www.friendlyarm.net/forum/topic/3267 Sounds to me like you're also a victim of the N43i-Display. You can cross-check the touchscreen-controller with the lcd-schematics (depends on 5 resistors - we're still trying to figure out the right hardware/kernel-configuration)...
Davef, The digitizer is not working but the LCD works, I can see the images on the screen, I can move the cursor if I attach a USB mouse, but not with the stylus. DeltaT My display is N43 (NL4827HC19). I would like to know how the signals are interpreted in the controller(S3C6410). I mean is it some kind of analog signal or is it a digital signal that is passed to the controller(S3C6410). Thanks John
John, Does the default Linux image that comes with the mini6410 include the ADC test program? If so, try tweaking the pot on the board to check that the numbers change. The resistive touchscreen uses ADC inputs to determine the position of the point that is touched. Search <tslib> Dave
I have photos and diagrams on which resistors to change and which configuration works for 6410/210 and which for 2440. Any particular place I should put it here? I'll also put a page on andahammer.com but not sure where or what to call it yet. There is a similar but simpler change for the A70 Innolux PCB. We have shipped 4 or 5 by accident that are the wrong way round and shipped replacements. If you got one from ARMWorks, email and get it replaced. If you are good with a soldering iron under a stereo microscope, it is pretty simple. They are all shorting bars - 0 ohm resistors - but one on the N43i, which is 10k. The 10K is only needed for the - well I better not guess.
Charlie, I am very confused of who you are, and how you involve in shipping out things. What have you shipped? What and how they got to do with mini6410? If this is a request from FriendlyARM, why is it come from you, not from FriendlyARM, and why not start a complete new topic?
The thread http://www.friendlyarm.net/forum/topic/3267 was very helpful. So I remove R1 and place it at R26, And similarly changed R34 -> R28, R35 -> R29, R36 -> R30 and R37 -> R31. And now the touchscreen works flawlessly. Thank you all for the help. John