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LCD displays nothing but rainbow pixels then fades to white

post #1 of 3
Thread Starter 
EDIT: Problem solved! I was just a sleepy idiot last night that didn't ground it correctly. Protip: for grounds that go onto screws, don't put them between the head of the screw and the board, put them between the board and the screw socket!



First off, was I wrong to think that an LVDS controller wouldn't get damaged from trying to drive an incompatible LCD panel?


So I have a 25" 1080p LCD HDTV from family relatives that had died, and from some earlier testing I was pretty sure the panel itself was fine. So I plugged the HDTV's CFL backlight into the according plugs inside my 1280x1024 LCD monitor and it worked fine - I had a pure white image. Next I plugged in the LVDS plug from my monitor into the HDTV to see if I could at least get some sort of picture, which I kind of did - I now had a black screen and nothing else, therefore I figured the LVDS controller wasn't compatible. Unplugging the LVDS connector again resulted in the pure white screen on the HDTV.

After that I reassembled my LCD monitor, hooked it back up, and was greeted by a screen full of nothing but rainbow pixels and stuff that after 20 seconds or so fades to white. When not hooked up to a computer I get no picture at all (it's supposed to say "No Signal").

Photos and maybe even a video will come tomorrow (assuming I don't solve the issue myself).


Any idea what's going on here and what could be wrong?
Edited by Nintendo Maniac 64 - 8/6/13 at 6:09pm
 
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White Monoprice 9963 IEM headphones [Left ear] LostEarBuds medium single-flange tip [Right ear] Unknown medium single-flange tip Asus Xonar DS 
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HTPC
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CPUMotherboardGraphicsGraphics
Pentium G3258 @ 4.6GHz/1.281v (rock-solid stable) MSI Z97 PC Mate [media & productivity] Intel HD graphics [games] Diamond Radeon HD5870 1GB 
RAMHard DriveHard DriveOptical Drive
4x4GB Corsair Vengance DDR3 @ 1800MHz 1.504v Crucial M500 480GB SSD RamDisk - adaptive 10GB volatile scratch LG Blu-ray drive 
CoolingCoolingCoolingOS
Cooler Master X6 Elite with stock fan removed CPU fan: 120mm Arctic F12 PWM @ ~300rpm PSU fan: 120mm Kingwin case fan via PSU fan plug Windows 7 Ultimate - 64bit SP1 
MonitorKeyboardPowerMouse
E772p CRT (Trinitron) @ 79-94hz 1152x864/1280x720 PS/2 Microsoft Internet Keyboard (replaced cord) Antec EA-380D (380w) with stock fan removed Logitech MX510 (blue) with replaced USB cord 
AudioAudioAudioAudio
White Monoprice 9963 IEM headphones [Left ear] LostEarBuds medium single-flange tip [Right ear] Unknown medium single-flange tip Asus Xonar DS 
AudioAudioAudio
Dual SOIC LME49990 DIP8 op amp [music] Foobar2000 + Xonar ASIO driver [games & movies] Razer Synapse 7.1ch to binaural 
CPUMotherboardGraphicsRAM
Core 2 Duo (Penryn) T8300 @ 2.4GHz Dell Studio 1535 Intel 965GMA 2GB 667MHz Samsung DDR2 
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1GB 667MHz Samsung DDR2 60GB Corsair Force 3 SSD Windows 7 64bit SP1 Toshiba 39L1350U HDTV 
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Some USB wireless Logitech keyboard Rocketfish universial power adapter (my cousin's) Some USB wireless Logitech mouse couch 
AudioAudio
HDMI audio-out to HDTV HDTV optical-out to Denon AVR-200 reciever 
CPUMotherboardGraphicsRAM
Pentium 3 @ 667MHz Some Intel mobo ATI Rage 128 AGP 32MB 2x256MB DDR1 
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1GB Sandisk CF card - boot drive Western Digital Caviar SE - 320GB IDE Maxtor - 200GB IDE RamDisk - adaptive 64MB viotle scratch 
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post #2 of 3
Check your ribbon connectors on your Tcon board. seems odd, maybe you blew it up plugging it into the hdtv?
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post #3 of 3
Thread Starter 
EDIT: Problem solved! I was just a sleepy idiot last night that didn't ground it correctly. Protip: for grounds that go onto screws, don't put them between the head of the screw and the board, put them between the board and the screw socket!



I just realized that I forgot to mention that I tried a different LVDS cable, but in the process forgot which way the cable plugged into the monitor's board. Noticing that the connector doesn't stop you from plugging in whichever way is upside down, I again assumed (probably incorrectly! though I found no info on google...) that meant that doing such a thing wouldn't hurt the monitor.

Therefore, I tried it both ways - the first way only had a white screen much like if I had not plugged the LVDS cable in. The second way was what resulted in my current situation.

To be honest even if I killed the monitor it's not that big of a deal since it did have a single minor problem, the resolution was kind of low for an LCD, was VGA only so only 1280x1024 would be mapped 1:1, had pretty crappy motion blur, the black levels and contrast was really quite crappy. Heck for an LCD even the dot pitch didn't seem to be that great compared to the professional-grade flat CRT it replaced...and most likely will get replaced with.

Of course, it was also the only LCD monitor I had that worked, and had a handle, so it was nice if I needed something mobile. I have a bunch of working CRTs though, and with carpet flooring you can just push/slide them around with relative ease. tongue.gif
Edited by Nintendo Maniac 64 - 8/6/13 at 6:09pm
 
HTPC
(14 items)
 
File server
(22 items)
 
CPUMotherboardGraphicsGraphics
Pentium G3258 @ 4.6GHz/1.281v (rock-solid stable) MSI Z97 PC Mate [media & productivity] Intel HD graphics [games] Diamond Radeon HD5870 1GB 
RAMHard DriveHard DriveOptical Drive
4x4GB Corsair Vengance DDR3 @ 1800MHz 1.504v Crucial M500 480GB SSD RamDisk - adaptive 10GB volatile scratch LG Blu-ray drive 
CoolingCoolingCoolingOS
Cooler Master X6 Elite with stock fan removed CPU fan: 120mm Arctic F12 PWM @ ~300rpm PSU fan: 120mm Kingwin case fan via PSU fan plug Windows 7 Ultimate - 64bit SP1 
MonitorKeyboardPowerMouse
E772p CRT (Trinitron) @ 79-94hz 1152x864/1280x720 PS/2 Microsoft Internet Keyboard (replaced cord) Antec EA-380D (380w) with stock fan removed Logitech MX510 (blue) with replaced USB cord 
AudioAudioAudioAudio
White Monoprice 9963 IEM headphones [Left ear] LostEarBuds medium single-flange tip [Right ear] Unknown medium single-flange tip Asus Xonar DS 
AudioAudioAudio
Dual SOIC LME49990 DIP8 op amp [music] Foobar2000 + Xonar ASIO driver [games & movies] Razer Synapse 7.1ch to binaural 
CPUMotherboardGraphicsRAM
Core 2 Duo (Penryn) T8300 @ 2.4GHz Dell Studio 1535 Intel 965GMA 2GB 667MHz Samsung DDR2 
RAMHard DriveOSMonitor
1GB 667MHz Samsung DDR2 60GB Corsair Force 3 SSD Windows 7 64bit SP1 Toshiba 39L1350U HDTV 
KeyboardPowerMouseMouse Pad
Some USB wireless Logitech keyboard Rocketfish universial power adapter (my cousin's) Some USB wireless Logitech mouse couch 
AudioAudio
HDMI audio-out to HDTV HDTV optical-out to Denon AVR-200 reciever 
CPUMotherboardGraphicsRAM
Pentium 3 @ 667MHz Some Intel mobo ATI Rage 128 AGP 32MB 2x256MB DDR1 
Hard DriveHard DriveHard DriveHard Drive
1GB Sandisk CF card - boot drive Western Digital Caviar SE - 320GB IDE Maxtor - 200GB IDE RamDisk - adaptive 64MB viotle scratch 
CoolingOSMonitorPower
Athlon XP 2000+ Palomino stock heatsink w/ copp... Windows 2000 Pro SP4 None - VNC is used instead Bestec ATX-250-12Z 
CaseOtherOther
Some super-basic beige case Intel PCI ethernet card Linksys PCI ethernet card 
  hide details  
Reply
 
HTPC
(14 items)
 
File server
(22 items)
 
CPUMotherboardGraphicsGraphics
Pentium G3258 @ 4.6GHz/1.281v (rock-solid stable) MSI Z97 PC Mate [media & productivity] Intel HD graphics [games] Diamond Radeon HD5870 1GB 
RAMHard DriveHard DriveOptical Drive
4x4GB Corsair Vengance DDR3 @ 1800MHz 1.504v Crucial M500 480GB SSD RamDisk - adaptive 10GB volatile scratch LG Blu-ray drive 
CoolingCoolingCoolingOS
Cooler Master X6 Elite with stock fan removed CPU fan: 120mm Arctic F12 PWM @ ~300rpm PSU fan: 120mm Kingwin case fan via PSU fan plug Windows 7 Ultimate - 64bit SP1 
MonitorKeyboardPowerMouse
E772p CRT (Trinitron) @ 79-94hz 1152x864/1280x720 PS/2 Microsoft Internet Keyboard (replaced cord) Antec EA-380D (380w) with stock fan removed Logitech MX510 (blue) with replaced USB cord 
AudioAudioAudioAudio
White Monoprice 9963 IEM headphones [Left ear] LostEarBuds medium single-flange tip [Right ear] Unknown medium single-flange tip Asus Xonar DS 
AudioAudioAudio
Dual SOIC LME49990 DIP8 op amp [music] Foobar2000 + Xonar ASIO driver [games & movies] Razer Synapse 7.1ch to binaural 
CPUMotherboardGraphicsRAM
Core 2 Duo (Penryn) T8300 @ 2.4GHz Dell Studio 1535 Intel 965GMA 2GB 667MHz Samsung DDR2 
RAMHard DriveOSMonitor
1GB 667MHz Samsung DDR2 60GB Corsair Force 3 SSD Windows 7 64bit SP1 Toshiba 39L1350U HDTV 
KeyboardPowerMouseMouse Pad
Some USB wireless Logitech keyboard Rocketfish universial power adapter (my cousin's) Some USB wireless Logitech mouse couch 
AudioAudio
HDMI audio-out to HDTV HDTV optical-out to Denon AVR-200 reciever 
CPUMotherboardGraphicsRAM
Pentium 3 @ 667MHz Some Intel mobo ATI Rage 128 AGP 32MB 2x256MB DDR1 
Hard DriveHard DriveHard DriveHard Drive
1GB Sandisk CF card - boot drive Western Digital Caviar SE - 320GB IDE Maxtor - 200GB IDE RamDisk - adaptive 64MB viotle scratch 
CoolingOSMonitorPower
Athlon XP 2000+ Palomino stock heatsink w/ copp... Windows 2000 Pro SP4 None - VNC is used instead Bestec ATX-250-12Z 
CaseOtherOther
Some super-basic beige case Intel PCI ethernet card Linksys PCI ethernet card 
  hide details  
Reply
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