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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Laptop display fault
Hi all, I have a Compaq Armada 1750 laptop and the display's developed an intermittent fault which at times is bad enough to make the screen totally unreadable. It doesn't seem to be temperature related and can happen at any time. The most noticeable problem is kind of like slender, white, verticle streaks going down the screen which flicker and vary in intensity. At worst, the whole screen apart from the top quarter inch along the top becomes whited out. Anyone have any idea what might be the cause of this problem or how to fix it? Thanks, p. -- "I believe history will be kind to me, since I intend to write it." - Winston Churchill |
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Laptop display fault
"Paul Burridge" wrote in message news Hi all, I have a Compaq Armada 1750 laptop and the display's developed an intermittent fault which at times is bad enough to make the screen totally unreadable. It doesn't seem to be temperature related and can happen at any time. The most noticeable problem is kind of like slender, white, verticle streaks going down the screen which flicker and vary in intensity. At worst, the whole screen apart from the top quarter inch along the top becomes whited out. Anyone have any idea what might be the cause of this problem or how to fix it? Thanks, Could be stress fracture in the glass, could be failing driver circuitry. Either way, probably needs a new panel. There are companies who do component level repairs to LCDs, but they certainly aren't cheap. However, damaged glass cannot be repaired, you'd need a whole LCD assembly. Dave |
#3
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Laptop display fault
It could just be a stressed cable going to the LCD panel. Might be loose,
also. This was the problem with my friend's Dell. His dad gave it to him because he thought it was broken and I fixed it within 10 minutes of him showing it to me. Try putting pressure on the top of the case near the hinges (above the keyboard) and see if it clears up at all. Scott McDonnell "Paul Burridge" wrote in message news Hi all, I have a Compaq Armada 1750 laptop and the display's developed an intermittent fault which at times is bad enough to make the screen totally unreadable. It doesn't seem to be temperature related and can happen at any time. The most noticeable problem is kind of like slender, white, verticle streaks going down the screen which flicker and vary in intensity. At worst, the whole screen apart from the top quarter inch along the top becomes whited out. Anyone have any idea what might be the cause of this problem or how to fix it? Thanks, p. -- "I believe history will be kind to me, since I intend to write it." - Winston Churchill |
#4
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Laptop display fault
"Scott McDonnell" wrote in message news:H2nVa.4112$cF.1703@rwcrnsc53... It could just be a stressed cable going to the LCD panel. Might be loose, also. This was the problem with my friend's Dell. His dad gave it to him because he thought it was broken and I fixed it within 10 minutes of him showing it to me. Try putting pressure on the top of the case near the hinges (above the keyboard) and see if it clears up at all. Scott McDonnell Hmm, I forgot to ask about the cable. Paul- do the lines change/move when adjusting the angle of the panel? Can you bring the fault on by 'exercising' the hinges? Dave |
#5
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Laptop display fault
Paul,
Hmm..."whited out"... this is the part that gets me. A whited out area would mean that the LCD crystals in that area are being turned *on*, usually LCD faults work the opposite way (blacked out.) Without seeing it for myself, I would gather that there is some kind of problem in the video adapter. That's worse cast scenario. Everything else also sounds a lot like the problem I had with my IBM Thinkpad. It was the backlight that needed replaced. Do you have a key on you keyboard to switch between the LCD and an external monitor? Try switching it when trouble strikes. This turns off the backlight and then triggers it again when you switch it back. If it helps (even just for a few seconds) it may be the lamp. Also, like Dave mentioned, if you are not squimish about opening the laptop, do as he suggested. Usually, you can get to the LCD cable by gently prying up the panel above the keyboard. There may be a screw or two on the back at the hinges. Lay the LCD as flat as possible before pulling up the plastic panel. If none of these things work for you, then you may need to check ebay for a replacement LCD or start shopping for a new laptop. If it isn't the LCD, cabling, or backlight then the necessary repair would likely be very expensive (not that replacement LCDs are cheap!) Scott "Paul Burridge" wrote in message news Hi all, I have a Compaq Armada 1750 laptop and the display's developed an intermittent fault which at times is bad enough to make the screen totally unreadable. It doesn't seem to be temperature related and can happen at any time. The most noticeable problem is kind of like slender, white, verticle streaks going down the screen which flicker and vary in intensity. At worst, the whole screen apart from the top quarter inch along the top becomes whited out. Anyone have any idea what might be the cause of this problem or how to fix it? Thanks, p. -- "I believe history will be kind to me, since I intend to write it." - Winston Churchill |
#6
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Laptop display fault
"Scott McDonnell" wrote in message news:7zHVa.14914$uu5.2368@sccrnsc04... Paul, Hmm..."whited out"... this is the part that gets me. A whited out area would mean that the LCD crystals in that area are being turned *on*, usually LCD faults Actually, LCDs pixels are white when they aren't energised, and black when they are. A dead panel with a working backlight will appear white, not black. IOW, A LCD element is normally transparent and becomes opaque when it is charged, not vice versa. Dave |
#7
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Laptop display fault
DOH, of course you are right! Don't know what I was thinking!
Scott "Dave D" wrote in message ... "Scott McDonnell" wrote in message news:7zHVa.14914$uu5.2368@sccrnsc04... Paul, Hmm..."whited out"... this is the part that gets me. A whited out area would mean that the LCD crystals in that area are being turned *on*, usually LCD faults Actually, LCDs pixels are white when they aren't energised, and black when they are. A dead panel with a working backlight will appear white, not black. IOW, A LCD element is normally transparent and becomes opaque when it is charged, not vice versa. Dave |
#8
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Laptop display fault
On Wed, 30 Jul 2003 01:46:16 +0000 (UTC), "Dave D"
wrote: If you feel comfortable dismantling the screen bezel, (take care, it's not too hard to crack thin bezels!) check the cable is seated properly in the connector. Also check the other end where it connects to the motherboard (sometimes they go to an intermediate pcb). If it does go to an intermediate pcb, check that is seated correctly. All this is likely fruitless though, lines usually indicate a fault in the circuits which address the actual TFT elements, a very tricky and expensive repair. I'm not familiar with the model, so I can't really comment on the viability of a professional repair. Thanks, Dave. it's a shame as often in the past I've given up on stuff and junked it only to find later that the fault was simple and readily repairable. Oh well.... -- "I believe history will be kind to me, since I intend to write it." - Winston Churchill |
#9
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Laptop display fault
"Paul Burridge" wrote in message news Thanks, Dave D, No, I can't bring it on by wiggling the hinge area, or putting pressure on any surface close to it. For some reason today, it hasn't even flickered once. And yet yesterday it was virtually totally unusable. I guess that's in the nature of intermittent faults. :-( Any ideas? -- "I believe history will be kind to me, since I intend to write it." - Winston Churchill I had a similar problem with my Compaq laptop. The flat ribbon cable that connects the mother board to the LCD screen is mounted near the cover hinge assembly. The cable had worn through! Good old Compaq ONLY wanted $100 USD for a replacement (6" , 6 conductor cable!). I made my own - $0.50 |
#10
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Laptop display fault
On Wed, 30 Jul 2003 21:41:24 GMT, "scada"
wrote: I had a similar problem with my Compaq laptop. The flat ribbon cable that connects the mother board to the LCD screen is mounted near the cover hinge assembly. The cable had worn through! Good old Compaq ONLY wanted $100 USD for a replacement (6" , 6 conductor cable!). I made my own - $0.50 Interesting! How does one gain access to it? -- "I believe history will be kind to me, since I intend to write it." - Winston Churchill |
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