Input for 2.5" LCD in a Blaupunkt HD Dashcam

Question

Hello, and thank you for reading my topic. I recently bought a "2.5" LCD HD Dashcam" from the Blaupunkt brand (BPDV122), although I am aware they have just used this design from another company.

https://www.blaupunkt.com/us/nc/products/in-vehicle-entertainment/cameras/products/single/14773/

I took it apart in hopes of using its LCD screen for another project. I couldn't find any specifications online, however I did find a lot of links to Remont-Aud. Many users there have disassembled similar models or the same model.

https://remont-aud.net/dump/gps_navigatory_videoregistratory/prochee/no_name_no_name_shassi_main_board_js_c007m_main_v1_…

https://remont-aud.net/dump/gps_navigatory_videoregistratory/prochee/no_name_no_name_shassi_main_board_l100d_main_v03_20171115/296-1-0-68178

https://remont-aud.net/dump/gps_navigatory_videoregistratory/prochee/no_name_hd_dvr_hd_portable_dvr_with_2_5tft_lcd_scre…

The Dashcam comes in two boards connected with a 24-pin AWM 20624 ribbon cable. The first board has the camera, LED lights, SD card reader, USB port, speaker, power on button, and record/select button. The second board has the 2.5" LCD screen and four buttons (Menu, up, down, and mode).

This video shows the teardown of one of these models: https://www.youtube.com/watch?v=rKeAGffMmJI

I wish to use the LCD screen from this Dascam with a Raspberry Pi Zero..the quality of the camera aspect wasn't important to me. If anyone here can help me, it would be very appreciated.

Board markings

On the first board: JS-C007M MAIN_V1.2 2016-06-08

On the second board: 20160507 and JS-C007M-LCD-V1.2

On the LCD flex cable: H9341, SJ24N-3670F, and HXY

patrickbootscec · Answer

I looked up a couple chips on the first board; voltage regulators, mosfets, chips for the charging circuit, and three larger chips. There was only one chip on the second board, another mosfet. The largest chip on the first board reads "24CC MQNK 173.1 1634". Googling that and those parts brought up nothing. The second largest read "MK 25Q80BVNIG 1645" which came up with the Winbond W25Q80BV. It seems to be "8-mbit serial flash memory with dual/quad SPI". I've seen some LCD displays marketed as being usable with SPI, so I assume this chip handles the display.

shabaz · Answer

Hi,

There's almost zero chance of getting the display functioning with the Pi. The 36-pin connector will most likely be expecting parallel data, not SPI. The chip you mention is a Flash memory chip, so that's definitely not involved in the display interaction, it most likely holds software.

Displays such as this are not normally reusable, unless you can find a driver board with the correct interface, which can be difficult - it's a matter of googling for boards that look like they have the same connector, and trying different boards, by which time (and cost) you may as well have purchased an SPI interfaced display anyway.

An almost similar story applies to the camera module too, i.e. close to zero chance it could be made to work with the Pi with any reasonable effort.

shabaz · Answer

Unfortunately there's no set standard, 40-way is fairly popular for a parallel display, but 50-pin is possible for those too. With the 40-way connector screens, often the touch interface is on a separate flex, not part of the 40 connections. It's not a standard as far as I'm aware, just a convention. 36-way could have lower bit depth per color, or it could be a data-bus interface (either parallel or serial). You could try to look for a pattern in the attached flex that is part of the display (for example if many pins look as if they are connected together then that could be 0V).

shabaz · Answer

That's great. In that case you may find source code if you google for " ILI9341 pi " - e.g. https://github.com/juj/fbcp-ili9341 You don't need any additional SPI chip.

shabaz · Answer

Exactly what michaelkellett says.. You'd have to desolder that display and design a PCB for it. There's really no point to this effort when you can buy a working display for low-cost.