Hi Ardell,
The printed word is not always the best means of communication.
I'm not sure I'm reading your post correctly, but it appears that you were a bit affronted by my use of the term "opinion".
You need not be. If I did not already consider you an expert in the field, I would not have asked your opinion in the first place.
You are correct, of course, about 2 to the 12th power equalling 4096, but you'll notice I was asking a question. At the time, I couldn't remember what 2^12 equaled, nor how to make this calculator display it.
Anyway, thanks for the info.
rogerX
--- In simplycomputers2@yahoogroups.com, Ardell Faul <ardell@...> wrote:
>
> This is not simply my opinion. I have been repairing and designing
> video display and video switching equipment since I started working in
> electronics in the 60's. I have a pretty good understanding of how
> these things work. I have several hundred broken and defective LCD
> panels the I have replaced over the last 10 years or so, and I did not
> replace them because the connecting cable was defective or not plugged
> in properly.
>
> 2 to the 12th power is only 4096, a pittance. The video sent from the
> motherboard to the LCD panel is NOT 12 bit digital. It is simple RGB,
> or maybe DVI at best.That number is just for illistration anyway. I
> suggest you get a broken panel and take a look at the back of it. There
> are ribbon cables wrapped around the edges from the circuit board
> inside the panel that connect to the individual lines and colums on the
> glass front panel, and they in turn are fed from dozens of ICs which
> control the pixels in an X-Y fashion. There are actually 3 pixels for
> each dot, one each for Red, Green, and Blue. If you take a very low
> resolution of 1024X768 and multiply that result by 3, you have the
> number 2,259,296. That is how many individual control lines you would
> need to turn each of the pixels on and off about every 10 Milliseconds
> or less if you addressed each pixel individually.
>
> The reason the top of the screen is bad and not the lower is because the
> most significant bit in the digital decoding taking place inside the
> panel has circuit problems associated with it. Almost none zero zilch
> defective panels are reparable, except for replacing the backlight if
> you are not afraid to grind the ends away so you can unsolder it and
> slide it out, then replace it with a good one and reconnect it up
> without damaging anything.
>
> I can.
>
>
>
> Ardell Faul
> Computer Monitor Service Inc.
> Ardell's Laptop and PC Repair
> 10816 E. Mission Ave.,
> Spokane Valley, Wa. 99206
> ardell@...
> 509-891-5188
>
>
> On 12/6/2011 10:05 PM, RogerX19 wrote:
> >
> > Hi Ardell,
> >
> > Interesting. But if all "dozen" wires were used to transmitted binary
> > code, how many possibilities would that be?
> >
> > What is 2^12 ?... (I don't know how to use Windows calculator in
> > binary) ... would that be more than 1024 x 768 ?
> >
> > Point is, the LCD screen is a matrix, with each node accessed by a
> > unique binary code.
> >
> > What would make the top half distorted, and the bottom half Ok?
> >
> > If the panel itself was bad, then something must have damaged all the
> > pixels in the top half.
> >
> > Or the signal received by the top half is corrupt.
> >
> > If each pixel (picture element) on the top half is distorted, is it
> > because the screen is bad, or because it is receiving a bad signal?
> >
> > What would cause all elements below 2^x to be corrupt, and all above
> > (2^x)+1 to be good?
> >
> > Is it displaying a bad image because the panel is physically
> > defective, or because it's receiving a defective digital signal?
> >
> > I don't have an answer ... just looking for your opinion.
> >
> > rogerX
> >
> > --- In simplycomputers2@yahoogroups.com
> > <mailto:simplycomputers2%40yahoogroups.com>, Ardell Faul <ardell@>
> > wrote:
> > >
> > > That is a defective LCD panel. The ability to control individual
> > pixels,
> > > or blocks of them, is developed within the panel itself. The cable
> > > coming from the motherboard video card to the LCD panel only has
> > about a
> > > dozen wires--no where near enough to control pixels at a 1024X768 count
> > > or higher. The RGB video signals are displayed by circuitry inside the
> > > panel pixel by pixel. Your is no longer able to do its job properly.
> > >
> > > The inverter thingy is simply a small DC converter that pumps up 12
> > > Volts DC to about 1200 Volts AC which is used to power a long thin
> > > fluorescent light bulb that is inside the panel along the bottom edge.
> > > It has nothing to do with the pixel control, but simply provides the
> > > light so you can see the displayed video.
> > >
> > > Ardell Faul
> > > Computer Monitor Service Inc.
> > > Ardell's Laptop and PC Repair
> > > 10816 E. Mission Ave.,
> > > Spokane Valley, Wa. 99206
> > > ardell@
> > > 509-891-5188
> > >
> > >
> > > On 12/6/2011 12:32 PM, ttynan@ wrote:
> > > >
> > > > Mine is slightly different. The top half is distorted with gridlines
> > > > and boxes kind of, flckering, bottom half normal. I was wondering if
> > > > it were an expensive screen failure or a cgip on the board. Ideas?
> > > > Inverter thingy?
> > > > Thanks
> > > >
> > > > --- In simplycomputers2@yahoogroups.com
> > <mailto:simplycomputers2%40yahoogroups.com>
> > > > <mailto:simplycomputers2%40yahoogroups.com>, "Clint \"From Flint\"
> > > > Williams" <clintfromflint@> wrote:
> > > > >
> > > > > It seems that your inverter has went bad. They are simplw to
> > replace
> > > > and fairly inexpensive usually on ebay. You can go to youtube and
> > > > search for a tutorial for your make and model on how to replace that
> > > > inverter.....
> > > > >
> > > > > Sent via my Samsung Galaxy Prevail from Boost Mobile
> > > > >
> > > > > SamBarr <Sam@> wrote:
> > > > >
> > > > > >I have a laptop with the same problem. You now have a "desktop".
> > > > > >
> > > > > >I can see the characters on the laptop screen but they are not
> > > > back-lit.
> > > > > >
> > > > > >You don't want to attempt to replace the display. If it is a loose
> > > > > >wire you would be fortunate but it is not worth replacing the
> > display.
> > > > > >
> > > > > >You can hook up a monitor, keyboard and mouse and it will be a fine
> > > > > >desktop. Just not portable.. I need a keyboard because the dead
> > > > > >display gets in the way of the external monitor. I just moved the
> > > > > >laptop out of the way like a desktop.
> > > > > >
> > > > > >Sam Barr
> > > > > >
> > > > > >--- In simplycomputers2@yahoogroups.com
> > <mailto:simplycomputers2%40yahoogroups.com>
> > > > <mailto:simplycomputers2%40yahoogroups.com>, "strippergirl2525"
> > > > <strippergirl2525@> wrote:
> > > > > >>
> > > > > >> Hey I hope someone can help me. I have a HP laptop with Vista
> > OS.
> > > > The screen will not lite up but when I plug another monitor into it
> > > > then you can see whats on the computer but the laptop screen does not
> > > > work. Can someone tell me what the problem is and is there a way that
> > > > I can fix this myself since I dont have a lot of money to take it to
> > > > the shop.
> > > > > >>
> > > > > >
> > > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
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