Can this be made into a T.V. screen?

Guest
My Dads Compaq Presio 1700 just died, and after saving a few parts to
sell on ebay he let me dismantle it. I took apart the caseing around
the screen and found two wires labled high voltage, which i asume are
for the flourecent back lighting, and one strip of many wires that ran
to the mother board. Is there some converter i could or make converter
Video in and out to the strip of wires?
 
ngdbud@hotmail.com wrote:

My Dads Compaq Presio 1700 just died, and after saving a few parts to
sell on ebay he let me dismantle it. I took apart the caseing around
the screen and found two wires labled high voltage, which i asume are
for the flourecent back lighting, and one strip of many wires that ran
to the mother board. Is there some converter i could or make converter
Video in and out to the strip of wires?
Click to expand...
The 'strip of wires' you refer to is the connection to the LCD display.

Since LCD TVs use the same kind of displays as computer LCDs it is indeed
theoretically possible to make the display work in that way. It's not a
trivial task though ! Certainly beyond the typical hobbyist level.

Graham
 
ngdbud@hotmail.com wrote:
My Dads Compaq Presio 1700 just died, and after saving a few parts to
sell on ebay he let me dismantle it. I took apart the caseing around
the screen and found two wires labled high voltage, which i asume are
for the flourecent back lighting, and one strip of many wires that ran
to the mother board. Is there some converter i could or make converter
Video in and out to the strip of wires?
Click to expand...
Ok, the two wires are indeed the backlight. In the rest of the laptop,
you should find the inverter somewhere, that generates the high voltage
from a low voltage dc source.

The strip of wires contains most likely :
- The TFT power
- Some LVDS pairs for the data transmission.

To display a TV image you need a video decoder chip that will transform
the composite/s-video signal into some digital stream. Unfortunatly, the
format is not compatible at all and you need a "glue" chip to store that
stream into a frame buffer and output the frame buffer into a LVDS
encoder (TI does some of theses chips, done especially for screens like
that).

Also, the TFT power might need to be applied in some specific sequence
to avoid damaging the screen.

Indeed, not that easy and probably not that cheap to build by yourself ...
Starting from a VGA sources might be easier as you would only need DACs,
maybe a CPLD for the logic, and a LVDS encoder. No need for storing
frames etc ...


Sylvain
 
I have already found the inverter. It is an entirely seperate chip with
a plastic sleve around it. While i'm on the topic of the inverter, it
has four input wires, black green white red, in that order. I can
assume that red and black are positive and negative, but what are the
white and green ones? If this helps, I just counted the pins that strip
of wire connected to, it was a flat 20 pin socket.
 
ngdbud@hotmail.com wrote:
I have already found the inverter. It is an entirely seperate chip with
a plastic sleve around it. While i'm on the topic of the inverter, it
has four input wires, black green white red, in that order. I can
assume that red and black are positive and negative, but what are the
white and green ones? If this helps, I just counted the pins that strip
of wire connected to, it was a flat 20 pin socket.
Click to expand...
From the level of knowledge exhibited in your post, it's likely that
it would take you significantly over a year, learning several hours a day
to do this.
It is not at all simple, unfortunately.
 
ngdbud@hotmail.com wrote:
I have already found the inverter. It is an entirely seperate chip with
a plastic sleve around it. While i'm on the topic of the inverter, it
has four input wires, black green white red, in that order. I can
assume that red and black are positive and negative, but what are the
white and green ones?
Click to expand...
Well, I have no clue ;) Without "seeing" the thing I can do much. I
guess they must be some kind of control signals to allow backlight
control. Maybe just poweron the laptop and put a scope on it to "see"
what's going on.

Or just find a reference ID on it and google for it.


If this helps, I just counted the pins that strip
of wire connected to, it was a flat 20 pin socket.
Click to expand...
The reference number of the panel would be more useful ;)

An educated guess would be that you have 4 LVDS pairs 3 for data, 1 for
clock. The rests are all power/ground.


Sylvain
 
Follow this link, it's ebay, but it's the inverter I have.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5182777998&category=31534
 
ngdbud@hotmail.com wrote:
Follow this link, it's ebay, but it's the inverter I have.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5182777998&category=31534
Click to expand...
The inverter is the easy bit.
Power this, and you get a blank white (or dull grey more likely) screen.
And that's all it does.
 
<ngdbud@hotmail.com> wrote in message
news:1123377023.224867.84350@g44g2000cwa.googlegroups.com...
Is there some converter i could or make converter
Video in and out to the strip of wires?
Click to expand...
It might be easier to sell the display and use the money buy one of those
small LCD flat-screen TeeVee's that double as a monitor. They are about USD
199 (no, you won't get that but .. what you are proposing is not trivial and
will cost more in any case).
 
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