Sorry to bring this back, but I know very little about electronics and I aim to buy the same model of LCD controller you have mentioned and hook it up to the rPi. I aim to build a general purpose portable computer with this and a LVDS 16" panel, which also has GPIO. I have a couple of questions:
The vendor on eBay states that a "12V, 4A" adapter is essential, does this mean that I would need a power supply that exceeds 4A (~5A) in order to take to rPi under load? How much current did the LCD you had need to draw?
Will the board create 5VDC in the supply first then the rest goes to power the LCD? Furthermore, in layman's terms, how did you wire the voltage regulator up to the board and the power source to the rPi?
Apologies if I am bombarding you with questions, and I am sure I could figure it out by trial and error, but I fear that I may fry my pi or my LCD board, and my time frame is quite strict (I need this by June 5). I will be buying the components off of eBay soon.
Hi, Very sorry I didn't see this, I thought the forum would notify me if someone responded, it doesn't
I would say 4A is an overkill, probably 'just to be sure' My panel is a 17" LCD with LED back lights and I'm using a 12V, 1.5A power supply to power the whole lot, including Pi, micro disk, etc. I would think 12V, 2A would be ample for most screens up to and around this size, I suspect the 4A is for if you are trying to drive a much larger panel.
The 5V supply is providing power to the LCD driver first I think, but it has ample power left over to power the Pi and other bits and pieces. As for exactly how you connect it.
Powering your pi from the screen driver board. (one less power supply to plug in)
You will need a 12V supply at about 2Amp should be ample, depending on what your panel size is and what you are powering, I've tested the 5V output up to 1.5A, which is plenty to drive a Pi, mini hard disk, small hub a WiFi dongle and mouse and keyboard.
This will only work with the Screen Driver board. M.NT68676.2A
Spec here:- http://www.drivestar.biz/files/M.NT68676.2A.pdf
Looking from the front of the board, ie the side with all the monitor connectors and power connectors on it; on the left hand side of the board behind the connector that goes to the LCD labelled 'CN5 INVERTER', there are 6 vacant pin holes in a line, labelled CN3. These are, from front to back Power On, 5V standby, 5V power, 5V power, Ground, Ground. (labelled on the back of the board PON, 5VSTB, +5V, +5V, GND, GND) We are only interested in the +5V and GND connections. You will need to suck the solder out of these 4 holes and then make up two short loops of copper wire in the shape of a long U, solder one of these into the holes for each pair of +5V and GND connections, ie so the two +5V are connected together and so the two GND are connected together. Then make up a cable, from some multi-strand wire, not bell wire it's too thin and connect to the P1 connector on the Pi, detailed information here:-
http://elinux.org/RPi_Low-level_periphe ... .28GPIO.29
You need to connect the +5V to pin 02 of P1 and the GND to pin 06 of P1, by doing this you will be bypassing the poly fuse on the Pi as well, so take care. I used a 3 pin plug that came of an old PC fan, this was the correct pitch and fitted over pins 02, 04 and 06, you may need to trim some of the plastic off the plug so it does not bind with other pins, I only connected to 02 and 06, the other end of the cable I soldered to the copper loops that I had inserted into the +5V and GND connections on the display driver board so +5V goes to P1 pin 02 and GND goes to P1 pin 06.
Double check what you have done, is the polarity correct? check with a multi-meter, that there are no short circuits? check for any solder bridges?
Firstly with the pi disconnected, power up the display driver board and check that there is 5V on the connector and it's the correct way round? power off the display driver board. If all is good, then connect the Pi to your new connector, check you've got it on the correct pins? then power up the display driver board, the Pi will now also be powered. You can only take a maximum of 1.5A from the 5V supply on the display driver board, so don't try to power lots of extra stuff!
Hope this helps and is'n too late.