LVDS cable help

**Lucky13ESP** · 03-27-2008, 02:47 PM

This page is from the user manual of the mobo. Available Headers

They appear to be different from the LVDS header.

**benedums** · 03-27-2008, 02:52 PM

what are the pin assignments of CN23 & CN18?

**Lucky13ESP** · 03-27-2008, 02:59 PM

**Lucky13ESP** · 03-27-2008, 03:10 PM

In the case that this is a 36 bit TTL output i've started matching up pinouts

I'm matching like so:

RA0 = R00
RA1 = R01

RB0 = R10
RB1 = R11

now for the trick part. I have these labels left over

On the LCD
CK (Dot Clock?)
Hsync (Latch Pulse?)
Vsync (First Line Marker?)
OHP-
ENAB

On the mobo
SHFCLK (Shift Clock?)
FLM (First Line Marker?)
M/DE (Display Enable?)
LP (Latch Pulse?)
ENAVEE

Let the matching game begin

Again, thanks for the help, I'm learning, albeit slowly

**benedums** · 03-27-2008, 03:56 PM

So is that from a motherboard or a controller board?

It looks like they split up the TTL interface between two connectors CN23 & CN18 which is a bit odd... none the less since the LCD is +5V you will not need to use the +3.3V... The ENAB on the LCD is probably the ENAVEE, CK could be SHFCLK, not sure where the Hsync and Vsync will mate to on the controller. and NC = No Connect...

I would be very surprised if this worked and didn't fry the controller or the LCD or both, so tread carefully.

It's best to find a controller that you know is compatible with the LCD...

**Lucky13ESP** · 03-27-2008, 07:05 PM

Thanks benedums. That is from the motherboard.

Anybody else want have any insight. I may have to contact the manufacturers to assure compatibility.

**Lucky13ESP** · 03-28-2008, 03:47 PM

That was a fairly quick response from the manufacturer. Here is what they said.

OHP-|????

So I think the pin to pin mapping is basically done. (I'm going to ignore the last two entrys for now. One has to do with flipping the screen and one has to do with something else.) Now I need to source the proper connectors (I'm sure I"ll need some help). Then on to bigger and better things, namely a touchscreen controller and backlight inverter.

**benedums** · 03-28-2008, 04:01 PM

The problem with TTL is it's susceptibility to EMI and limited cable length (about 18" max). Which is why most mother boards that support LCD's have at least LVDS.

There are some companies that make a TTL to LVDS adapter which will allow you to run the cable as LVDS and place the adapter next to the LCD with a short TTL cable to the LCD.

you'll probably have the best luck searching for connectors and cabling on Digikey.com, Mouser.com and Google.

Hirose makes some of the LVDS and TTL connectors that will work.

Does you MB have a backlight inverter? some new ones do.
If not those things can be found on the above sites as well.

**Rob Withey** · 03-28-2008, 05:12 PM

Originally Posted by Rob Withey

It can be made to work. I'm running an 18 bit TTL panel from an LVDS output using a Advantech PCM3540 LVDS receiver to interface it.

Originally Posted by benedums

There are some companies that make a TTL to LVDS adapter which will allow you to run the cable as LVDS and place the adapter next to the LCD with a short TTL cable to the LCD.