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en:ovi40build:displaybuild [25.04.2018 07:26] – df9ts | en:ovi40build:displaybuild [15.05.2018 13:18] (current) – [Display Assembly] df8oe | ||
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- | Start the calibration by touching the touch screen with a finger **before** | + | Start the calibration by touching the touch screen with a finger **before** |
+ | |||
+ | Sometimes calibration fails and there is need to repeat it. That's why there is a test screen with drawing dots (you can use also the blue test screen to check if it works). You have to play with it to be familiar. If the accuracy is not perfect (it should be less than 1mm) you have to change the calibration method or have issue with the panel itself. One preferred method for calibration is to use plastic stylus or soft pencil (gentle), but you can do it with nail with good results. | ||
==== Mechanical fixing of the display board onto the UI board ==== | ==== Mechanical fixing of the display board onto the UI board ==== | ||
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This pdf contains th modified assembly notes: {{: | This pdf contains th modified assembly notes: {{: | ||
- | * C103 not needed anymore | + | * C103, C112, IC103 and R106 are not needed anymore |
* R101 = R104 = 100K | * R101 = R104 = 100K | ||
- | * R106 = 1K | ||
* R102 = 15R | * R102 = 15R | ||
+ | * R105 = 3.3R | ||
* all 10u now replaced by 1u | * all 10u now replaced by 1u | ||
* XPT2046 = ADS7843E | * XPT2046 = ADS7843E | ||
+ | |||
+ | Put a small wire between pin3 and pin4 of IC103. Shorten R107 forever. | ||
+ | |||
+ | LCD can only work in parallel mode - there //will never be a SPI mode.// | ||
DF8OE suggest to replace the two parallel tantal capacitors next to the 3.3V voltage regulator by 100nF & 1uF. He also suggest to put 100nF & 1uF in the free location shown in Andy's photo. | DF8OE suggest to replace the two parallel tantal capacitors next to the 3.3V voltage regulator by 100nF & 1uF. He also suggest to put 100nF & 1uF in the free location shown in Andy's photo. | ||
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Das Doppelklebeband links in voller Höhe (überdeckt die 20pol Löcher) in ca. 1cm Breite positionieren, | Das Doppelklebeband links in voller Höhe (überdeckt die 20pol Löcher) in ca. 1cm Breite positionieren, | ||
+ | |||
==== On shortening the male header J103 on OVI40 UI for LCD display ==== | ==== On shortening the male header J103 on OVI40 UI for LCD display ==== |