Linux android-main-board-with-dedicated-technical-
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The document outlines the specifications and features of the PV135 multimedia LCD driver integrated board, which is based on the Allwinner V40 chip and supports various display and connectivity interfaces. It includes multiple peripheral interfaces, supports 4G and Wi-Fi connectivity, and offers audio and power supply specifications, alongside instructions for firmware updates and potential troubleshooting. Additional notes cover display compatibility and configuration adjustments using a TF card for optimal performance.
Linux android-main-board-with-dedicated-technical-
- 1. PV135 main board instructions
- 2. 01 02 03 04 Introduction PV135 is a multimedia LCD driver integrated board based on Allwinner V40 main chip, which is equipped with 1GB/2GB DDR+8GB/16GB/32GB eMMC. It can support lvds or mipi display, CVBS input and output, VGA output, YPbPr our put and HDMI high definition output. Its mater IC adopts TSMC's 40nm HPC manufacturing process, based on the ARM Cortex-A7 architecture and four cores, and its main frequency can reach up to 1.5GHz. The application of Allwinner new generation SmartColor technology contributes to brilliant pictures display under the high resolution and provide a pleasant visual effect for your machine. Main features: u 4 cores, reach up to 1.5 GHz main frequency u Support lvds displays and mipi displays and dual display u Support CVBS input and output u Support VGA output and YPBPR output u 4 serial ports, 6 USB ports, TF cards and other many expansion interfaces
- 3. 1 Motherboard Peripheral interfaces All the motherboard Peripheral interfaces as below picture shows
- 4. 1.1 Display Interfaces LVDS interface Support Ypbpr and VGA output MIPI interface Support CVBS output Support HDMI 1.4 output, 1080p (Single channel, 6-bit dual channel, 8-bit dual channel) support 7”-100” display Support maximum resolution 1920x1080
- 5. 1.1.1 Display interfaces is showed as the below picture (The specific line sequence can be reference to the silk screen behind the motherboard)
- 6. 1.2 Interface Equipments 6 USB HOST, 2 onboard and 4 external equipment Support headphone output, built-in power amplifier, support 2W * 2 8Ω speakers 3 TTL and 1 RS232; Or 4 TTL/2 TTL and 2 RS232 128GB TF card expansion, maximum 128GB Support external switch button, reset button or plug-in button small board or lamp board, support gpio port Two onboard equipment: One of them is silk printed with the mark USB OTG & HOST, which USB port is used to Firmware updates and adb debugging Connect to uart0 when serial port capture logs Uart 2 should be TTL, uart 5 be RS232, and uart7 be TTL or RS233.Also it can be judged according to the tr, rx electrical level measured by multimeter.(The tr, rx electrical level should be 5 V or negative level ) Support remote control devices
- 7. 1.2.1 Interface equipments are showed as the below picture (The specific line sequence can be reference to the silk screen behind the motherboard) h e a d p h o n e p o r t T F c a r d p o r t p o w e r p o r t s p e a ke r p o r t Re m o t e c o n t r o l l i g h t p o r t
- 8. 1.3 Internet Support wifi module Support bluetooth module RJ45 standard interface, 100M Ethernet interface, support Ethernet Equip with 3G data / 4G data function, support WCDMA, EVDO, CDMA, GSM, 2G / 3G full band support 850/900/1800 / 1900MHz / 2100MHz (do not connect other peripherals to USB1 when using 4G module)
- 9. 1.3.1 The specific location of the internet is shown in the figure W h e n u s i n g t h e 4 g m o d u l e , t h e u s b 1 p o r t s h o u l d n o t c o n n e c t t o o t h e r e x t e r n a l e q u i p m e n t . B a c k s i d e i s t h e s i m c a r d p o r t I n t e r n e t p o r t W i F i / b l u e t o o t h a n t e n n a p o r t
- 10. 1.4 Touch Screen Support infrared touch screen (USB touch screen), capacitive touch screen (as shown in the figure below, the specific wiring reference to the silk print behind ) CTP interface
- 11. 1.5 Audio Input Support MIC, 1 microphone interface (wrong positive and negative connection will influence the sound effect), support headset microphone (lower right picture shows the internal definition of the earphone interface) (as shown in the figure below, the specific wiring can be reference to the behind the silk print) Earphone port
- 12. 1.6 LCD Power Supply And Backlight LCD power supply support 3.3V/5V/12V (as shown in the figure below, the specific wiring reference to the silk print behind ) LCD power supply(from left to right): 3.3V/5V/12V backlight socket
- 13. 1.7 Power Power cord specifications The input voltage is 12V (recommended to use a minimum 12v 3A power supply) Note: The diameter of the power cord port is 2.1mm power port power socket
- 14. 1.8 Motherboard Driving LVDS Display Prepare materialS motherboard, lvds display, power cord display: Confirm that the burned firmware on the motherboard is to drive LVDS display 12V Power cord specification: input voltage is 12V Note: The diameter of the power cord port is 2.1mm
- 15. 1.8.1 Driving display notes Pay attention to the wiring method of the screen cable and the direction of the first pin Pay attention to the the supply voltage of the display v Display ≤15 inch: choose the 3.3v supply v 15inch<display≤21.5 inch：choose the 5v supply v 21.5 inch<display≤32 inch：please reference to the datasheet v display≥32 inch: choose the 12v supply. Pay attention to the selection of screen power supply switch v Check the datasheet of motherboard(reference to the motherboard specification) v Check the silk print behind the board v Check the pictures of different version Note: the mismatch of the power cord may cause problems such as poor contact or power failure
- 16. 1.8.2 Wire as below picture to drive the lvds screen( (The specific line sequence can be reference to the silk screen behind the motherboard) d i s p l a y c a b l e , p a y a t t e n t i o n t o t h e p i n 1 d i r e c t i o n b a c k l i g h t c a b l e p o w e r
- 17. 1.9 Motherboard driving LVDS display prepare material motherboard, lvds display, power cord display: Confirm that the burned firmware on the motherboard is to drive LVDS display 12V Power cord specification: input voltage is 12V Note: The diameter of the power cord port is 2.1mm
- 18. 1.9.1 Notes of driving display Note the wiring method of the screen cable and the direction of the first pin Note that the mismatch of the power cord may cause problems such as poor contact or power failure pay attention to the pin 1 direction and the golden finger of display cable should be face down
- 19. 2.1 upgrade failure 2.1.1 usb cabe flash failure The motherboard is not identified by the upgrade tools v Check if the usb cable is connected to the upgrade port of board (silk print mark as otg_usb) v Confirm if the male to male usb cable works v Check if the driver is installed correct. The motherboard is identified by the upgrade tools, but update unsuccessfully. v Update unsuccessfully on the half way: 1)Confirm not touching the flash cable in the upgrade process; 2) Confirm that there is no conductor attachment on both sides of the motherboard v The motherboard is identified by the upgrade tools, but the upgrade progress cannot be continued: 1) Confirm that there is no conductor attached to both sides of the motherboard, 2) Change a shorter male to male USB flash cable 3) Unplug other peripherals equipments v If it's none of the above situation, please contact the sales to send back the motherboard to repair.
- 20. 2.1.2 Failure of TF card upgrade v Confirm the TF card works v Confirm that the firmware are burned to the TF card v Confirm if the TF card is pulled out when power again v If it's none of above situation, suggest changing a new TF card and try it again
- 21. ３ Update the screen parameters through TF card Prerequisites: If the screen parameters in the firmware are not fixed, you can upgrade the screen parameters through the TF card TF card upgrade instructions: v Rename the“display_param-xxx.cfg”in the corresponding resolution folder as “display_param.cfg” and place it in the root directory of the tf card; v Insert the tf card into the machine and restart it. If the screen match its parameters, it will be displayed normally during the startup animation stage; v If the screen cannot work normally with these parameters, please try the cfg files one by one in each corresponding resolution according to above method until the display is normal; v If the cfg files of all resolution in the folder are not displayed properly, it means that the screen is special and please contact the board manufacturer for debugging;