+1 However there are two ways to power the display and a connected Pi - either sharing the Pi's power connection via the GPIO pins or, as I did here: http://www.cpmspectrepi.uk/raspberry_pi ... splay.html power the display and sharing it's power by a short, thick USB to uUSB (possibly right-angled) cable. Which method are you using? What power supply?jamesh wrote: ↑Tue Jan 08, 2019 3:55 pmThe official touchsvcreen, if connected correctly, should just work. The display is autodetected, so should start up with the same rainbox screen as you see on HDMI output, then boot to either console or desktop.
So if you are not getting the rainbox screen, something is either badly connected or broken. I pressume you have the correct power leads from the Pi to the display PCB installed, and the ribbon cable is inserted correctly at both ends?
What do you mean by "a USB splitter"? (eg. passive cable or a USB hub perhaps?). "Kit power supplies" are not necessarily the same as "Official" ones - so what "Kit" and what does their spec./label state? The shared connection between the Pi and display board should either be GPIO pin-to-pin (Pi to display board) or via uUSB in to the display board and USB (out) from the board to uUSB on the Pi. Also was the display supplied with the display (interface) board already connected to the display (like mine)?BranLoux896 wrote: Most recently I had the GPIO pins connected and powered each the Pi and the monitor, as well as a USB splitter. I’ve used two different power supplies that came with my RPi kits. They power the Pi just fine no matter which method I use, but the display never responds
O.K. so (after checking the Amazon images) possibly not one of the (Official) Stonetronics devices**. A P3B+ will be more demanding than a P3A+ ... so, any sign of a "low-voltage" warning ie. flashing red PoWeR led (or even a brief appearance of a "lightning bolt" on a black screen ...)?
I'm not sure about that, in that, for the screen I have**, AFAICT the backlight is not (easily?) visible "on its own" (ie. it's obviously on when there's text or graphics displayed but, otherwise, may be off) AIUI (but I may be wrong) for the original display backlight control (by software) was somewhat optional in the sense that it is (was) controlled by an I2C link which had to be connected to be used. IIRC for the new version (which I have), with control board pre-installed, that I2C link has been connected. (I'll fire mine up and check with i2cdetect and edit this post if I can confirm that)
The flat ribbon connectors have always been a "little tricky":BranLoux896 wrote: ↑Fri Jan 11, 2019 8:19 pmI actually tried again before I left the house and the green indicator light DID come on, but no reaction from the monitor. I strongly believe it has something to do with the DSI connection. I know a lot of people have said that the connectors have been installed backwards on the boards when being built. I really wanna post pics. Ill do it in a few mins when i get back home.
Why? That method of powering the screen works well.
if you KNEW why did you ask