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en:ovi40build:displaybuild [25.04.2018 07:26]
df9ts
en:ovi40build:displaybuild [15.05.2018 13:18]
df8oe [Display Assembly]
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 <​bootnote important>​It is mandatory to do a display calibration at first bring-up / switch on of the touch screen display. Only after calibration will the touch screen work with UHSDR.</​bootnote>​. The calibration is required initially. No later calibration needed during operation. <​bootnote important>​It is mandatory to do a display calibration at first bring-up / switch on of the touch screen display. Only after calibration will the touch screen work with UHSDR.</​bootnote>​. The calibration is required initially. No later calibration needed during operation.
  
-Start the calibration by touching the touch screen with a finger **before** ​ switching on the UI board V1.8. Keep touching the touch screen until the service menu sis displayed. Now release the finger from the touch screen and follow instructions on the screen carefully. After calibration is finished please ​save the calibration ​by long-pressing the "​menu" ​button ​switch on the UI board, ​then long-press "​power" ​button.+Start the calibration by touching the touch screen with a finger **before** ​ switching on the UI board V1.8. Keep touching the touch screen until the service menu sis displayed. Now release the finger from the touch screen and follow instructions on the screen carefully. After calibration is finished please ​leave the test screen ​by pressing the POWER button ​and then, when firmware start to work, please ​long press MENU (F1) button ​to save the calibration settings (the MENU should be marked with * and different colour, which means you have not saved settings). 
 + 
 +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: {{:​projekte:​ovi40-sdr:​lcd_35_40pin_df8oe_sp9bsl.pdf|lcd_35_40pin_df8oe_sp9bsl.pdf}} This pdf contains th modified assembly notes: {{:​projekte:​ovi40-sdr:​lcd_35_40pin_df8oe_sp9bsl.pdf|lcd_35_40pin_df8oe_sp9bsl.pdf}}
  
-  * 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,​ und dann oben und unten in ca. 5mm Breite über die volle PCB Länge. Rechts kommt KEIN Klebeband hin. Es ist zu vermeiden rechts mit Kraft auf das LCD zu drücken. Dort ist es sehr empfindlich,​ weil dort kein Plastik-Rand darunter ist. Das Doppelklebeband links in voller Höhe (überdeckt die 20pol Löcher) in ca. 1cm Breite positionieren,​ und dann oben und unten in ca. 5mm Breite über die volle PCB Länge. Rechts kommt KEIN Klebeband hin. Es ist zu vermeiden rechts mit Kraft auf das LCD zu drücken. Dort ist es sehr empfindlich,​ weil dort kein Plastik-Rand darunter ist.
 +
  
 ==== On shortening the male header J103 on OVI40 UI for LCD display ==== ==== On shortening the male header J103 on OVI40 UI for LCD display ====