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Thread: LCD fuzzyness problem...???

  1. #1
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    Jun 2001
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    Post LCD fuzzyness problem...???

    I have the NEC 12.1 LCD from flat-panel with the vga controller on the back...I finally got it back in today but to relize that it has lines across....like moving lines....Almost like there is interfernce...I know it doesn;t do this becuase it has been working fine...I was thinking maybe I have "dirty power" since I am using my cig lighter for the power source...Should I wire the LCD to the PSU? If I should which wire is + 12? yelloe or red? And which Black wire...?? I think its yellow the black next to yellow?? But correct me if i am wrong...Also could the interferance be between my VGA cables...I am using an vga extender???

    A question off topic...I did one of my first road test but I give it a "D"...I first tried running my DVD...I made an 8 foot IDE cable and it worked...but after about 10 min the audio kicked off...and the dvd froze...Power butten and mouse keys were unresponsive...So..I was thinking it might be my sound card just slide out...I jump back there and just pull it out and reseated it...Then I just used winamp...and sure enough the sound kicked off but the video did not lock up...Could the sound card actually be overheating? I do have the PSU in the same box as the motherboard...is that too much heat? The vid card does have a fan on it...

    Any info people need on the ide cable i can help...I did not have to strip and wires or solder anything together..and best of yet I used no tape no glue...It looks professional..It takes me about 15 min to make one cable..

  2. #2
    Constant Bitrate
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    May 2001
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    Australia
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    The lines are probably some electrical noise being picked up by the display. If you open the display panel in a laptop you will notice a metal shield so that noise can't enter through the back of the screen. I have noticed the same lines when laptop screens are out of their casing. You may need some shielding on the back.

  3. #3
    Constant Bitrate
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    May 2001
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    citrus3000psi, care to go into more detail on how you made your ide cable? i too, have made a few 15ft ide cables...but i'm always interested to hear how other people do it theres always room for improvement
    Athlon 500, 128 MB, ATI Xpert 4MB AGP TV-Out, Sound Blaster Live! Value, 8.4 GB, 2x20 Backlit LCD, Keypower 250 Watt ATX DC-DC, DSchmitd Startup/Shutdown Controller, IRMan + Backlit IR Remote, Custom Keypad, 5.6" NTSC LCD, In-Dash Slot Loading DVD, all installed in an '87 Honda Accord LX-i

  4. #4
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    To make my IDE cable...I get cat 5 cable...However long I want it...5 Pieces...Since IDE is 40 pins...Then..I go get a regular IDE cable...I work at a computer shop so we have tons of IDE cables, but I think there are 3 kinds of IDE cables...The difference is how the plastic piece holds the ribbon down. I found one where there is only one piece to take out and its easy as hell to take apart with out breaking. So get one of those cables...U will need 3 plugs basically. Then just gently take apart the IDE...and pull the cable off the IDE. Notice how the ribbon is actually like cripped in to connector...The cat 5 will do the same...I take the cat 5 and start at one end..and use a color order..like Orange, orange white, blue, blue white etc...And I do one piece of cat 5 at a time..But once i am done with one piece of cat 5...I take my extra end top connector piece and force it down on the wires...This pushes the wires down into place and holds them...I wouldn't use anything else to crip the wires in place...I tried it and ****ed it all up..and just go one cat 5 at a time...and do the other side..Make sure the cat 5 is in order on the other side...and snap the plastic peices in..and your good to go... I ****ed up twice before i go one perfect. But i was learning as i went etc.

  5. #5
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    Talking

    Turns out the fuzzyness was from the dirty power...I just plugged it in the PSU and it worked fine...

  6. #6
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    sounds very similar to the way i first did it, but then i discovered 25-pair backbone cable. this stuff is basically the same as cat 5 (same guage wire), but it has 50 pairs in a single run. i took this and just used 40 of the wires and pushed each one right into the ide connector. additionally to protect against EMI i covered the whole cable in this special braided cable sheilding and put aluminum foil near the ide connectors themselves...and of course grounded it all. my only major problem thus far is that i cannot get any of the devices connected to it, to operate in DMA mode :\ can you get yours in DMA?

    not where i got my 25-pair...but this is good stuff...
    http://www.connectworld.net/cgi-bin/iec/CAB050-PH-PL-SH
    Athlon 500, 128 MB, ATI Xpert 4MB AGP TV-Out, Sound Blaster Live! Value, 8.4 GB, 2x20 Backlit LCD, Keypower 250 Watt ATX DC-DC, DSchmitd Startup/Shutdown Controller, IRMan + Backlit IR Remote, Custom Keypad, 5.6" NTSC LCD, In-Dash Slot Loading DVD, all installed in an '87 Honda Accord LX-i

  7. #7
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    Aug 2006
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    40wire IDE cable isn't UDMA capable

    In order to run Ultra DMA mode 2 and above, you need an 80 conductor wire. I'm not exacly sure where wires meet, but essentially, you are putting 40bits of data down 2 sets of 40 wires, which starts out as, and finishes as 40 pins on each side of the cable. There is also a notch in one of the wires, and one of the pins is missing too... 38bits (plus one carrier detect).
    Also, ATA is a parallel (synchronous) transmission interface. All bits need to arrive at each end of the chain at the exact same time. The faster the interface, the shorter the interval between transmits. If 37 out of the 38 bits arrive in sync, and one arrives after the window, it blows the whole transmission frame... I highly suggest using a SCSI cable for what you are doing. It has all of the twists (like CAT5) but no sheathing between each set of 8 wires. Essentially, if you unsheathed 5 CAT5's and trimmed each wire to be exactly the same length, then braided them so they were not just arranged in pairs, but rather ALL the wires twisted with every other wire for each measured distance, then you could ensure good data across the lines. Twisting in wires reduces the reflexive induction properties of wires carrying voltage (cross-talk). Good luck, and study an 80conductor wire carefully to solve your problem.

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