HP L1502 VGA Cable

Hi,

I've got 2 working L1502 TFT screens, but their VGA Cable was cut.

Those cables are plugged inside the monitor via a flat 13 pin connector.

Could someone explain the pin assignement between the 15 pin VGA connector
and the 13 pin inside connector so i could fix a new VGA connector to those
monitors ?

To avoid misunderstadings, here my notation of the VGA pinout :

____________________
\ 1 2 3 4 5 /
\ 6 7 8 9 10 /
\ 11 12 13 14 15 /
---------------------

Thanks

yeti68

Hi there, Yeti,
I've got a similar problem.
A friend acquired an HP L1502 LCD screen that came without the
internal cable!
I have worked out that pins 13, 11 and 9 are the R, G and B inputs
respectively, and that 12, 10 and 8 are their grounds, respectively.
I can't work out HSYNC and VSYNC.
I'll let you know how I go.
regards,
iun

Back again,
Just want to clarify a few things.
My internal connector has 14 pins, and the pin numbers I sent you in
the last posting are those of the 14 pin internal connector.
Is your internal cable cut??
If not, the 15-pin D-sub connector ought to have standard VGA pinouts
as listed here:
http://www.hardwarebook.info/VGA_%2815%29
If it IS your internal cable that has been cut, let me know your email
address and I'll try and work it out.
ciao
iun

Hi iun,

Thanks for your posts.

I have L1502 which VGA cable had normal VGA connector on PC side , on
monitor side, there is no VGA , the cable goes directly to the mainboard of
the monitor via a 13 pin flat connector . only 13 Pol, not 14.

The external VGA connector was also cut so i have no way to know. If i had
it it would have been easy to test with only an ohmmeter.

But i know there are some differences in model produced in 2003 and 2004.

If you find some other infos, let me know.

regards

yeti68


"iun" <> a écrit dans le message de
news:...
> Back again,
> Just want to clarify a few things.
> My internal connector has 14 pins, and the pin numbers I sent you in
> the last posting are those of the 14 pin internal connector.
> Is your internal cable cut??
> If not, the 15-pin D-sub connector ought to have standard VGA pinouts
> as listed here:
> http://www.hardwarebook.info/VGA_%2815%29
> If it IS your internal cable that has been cut, let me know your email
> address and I'll try and work it out.
> ciao
> iun
>

Hi again,
I worked out the 14 pin connector by downloading the datasheet for the
Genesis gm2125 IC and tracing the R, G and B inputs with their
respective grounds plus the Horizontal and Vertical sync inputs back
to their pins on the 14 pin connector. R, B and B were easy.
Tracing the H and V signal lines was tricky, as the signal passed
through a hex inverter and several other components, via several
plated-through holes on the circuit board.
The monitor now works AOK and here are the pinouts I discovered:

14 pin connector------------> 15 pin D connector

13: R-------------------------> 1
12: R ground----------------> 6
11: G-------------------------> 2
10: G ground----------------> 7
9: B-------------------------> 3
8: B ground----------------> 8
6: H sync-------------------> 13
5: V sync-------------------> 14

The other pins on the connector are related to the Monitor ID signal
which are not needed. Pin 10 of the 15-pin D connector (Sync ground)
plus the cable's sheild were soldered to the ground plane of the
circuit board.

Good luck!
ian

> I worked out the 14 pin connector by downloading the datasheet for the
> Genesis gm2125 IC and tracing the R, G and B inputs with their
> respective grounds plus the Horizontal and Vertical sync inputs back
> to their pins on the 14 pin connector. R, B and B were easy.
> Tracing the H and V signal lines was tricky, as the signal passed
> through a hex inverter and several other components, via several
> plated-through holes on the circuit board.

I've been trying to figure out how to connect an L1702, and your pinouts
appear to be pretty much the same as I was looking at - however - the
VGA cable I have has four double-insulated cores and several thin cores
(although I got as far as stripping the monitor to get to the connector,
I could see no identification for what the cores were, so went back to
working on the cut ends of the VGA cable).

The RGB on mine was red / grey / blue, but I just get "check video
signal" - the H line (I think it was) had been reported elsewhere as
being a yellow cable - from your experience, was this yellow core a
double-insulated, or a thin core ?

Do you happen to have any record of the core colours on your cable
please ?

TIA :-}

Hi Colin,
VGA cables use wires of all different colours.
Buzz the wires out with a multimeter using the pinouts at this
webpage:
http://www.hardwarebook.info/VGA_%2815%29
The relevant pins on the 15 pin D connector you need are R (1), G (2)
, B (3), their grounds (6,7 and 8 respectively), H sync (13), V sync
(14) and sync ground (10).
Good luck!
Regards,
Ian

> VGA cables use wires of all different colours.
> The relevant pins on the 15 pin D connector you need are R (1), G (2)
> , B (3), their grounds (6,7 and 8 respectively), H sync (13), V sync
> (14) and sync ground (10).

Thans Iun - I already knew what pins to connect in the 15 pin VGA plug,
I was wondering if the colour coding was the same for the L1702 at the
other end, internal to the monitor (like a pin header connector) - and
if the V Sync was a single core cable or double insulated / coaxial type
like the RGB

I'd already wired up using the single core yellow and got "no video
signal" - but if it was supposed to be the yellow coaxial core I was
connecting i'll get the soldering iron out again :-}

> I'd already wired up using the single core yellow and got "no video
> signal" - but if it was supposed to be the yellow coaxial core I was
> connecting i'll get the soldering iron out again :-}

Oh well, tried again tonight, still can't get it working... back to plan
"A" (which I wanted to do in the first place) and just buy the missus a
new sodding monitor :-}

On Sat, 31 Mar 2007 01:43:35 +0100, Colin Wilson
< o.uk> wrote:

>> I'd already wired up using the single core yellow and got "no video
>> signal" - but if it was supposed to be the yellow coaxial core I was
>> connecting i'll get the soldering iron out again :-}
>
>Oh well, tried again tonight, still can't get it working... back to plan
>"A" (which I wanted to do in the first place) and just buy the missus a
>new sodding monitor :-}

If it helps I think you will find the 'no video signal' is actually a
'no snyc signal' error. Recheck the sync lines again... Especially the
vertical sync...