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Self powered ghost monitor problem

post #1 of 5
Thread Starter 
Hey guys,
My old square acer montior was being used as my extended desktop display, however it seemed to have died after the screen would always start dim, and within a second or two fade to off. I know other people who have had the same problem and had to have their monitors repaired or replaced, but i wont bother with such an old monitor.

However, With all the power off and unplugged from the wall, Every 20 or so seconds all 7 led indicators on the front will light up for a second or so, and then turn back off. Ive let it sit like this overnight and its still going in the morning... whats up with this?
    
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post #2 of 5
The Throw back capacitors in older CRTs are quite large. Most of the time whenever someone works on or repairs one of these monitors they first have to ground out that capacitor in order to release all the stored charge.

LEDs take very small amounts of power to be illuminated.

Try powering the monitor on with it unplugged a few times.

If it is unresponsive to this...it may take a few days or more to get rid of that residual charge in the cap.
post #3 of 5
What is likely the cause is either a battery backup or ultracapacitor. Normally it would be used to prevent the monitor from loosing its settings if the power were to be disconnected. but being as it lasted overnight I'm leaning toward lithium battery.

Also its called a fly back transformer
and although it has capacitance it is very little (a few nF)
and finally the flyback trans and the intrinsic capacitance of the tube both store around 25kv, leds run at 2-3.5 volts.
Edited by DSP1 - 10/10/11 at 1:19pm
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Sandy Thunder
(18 items)
 
QuickSilver X1
(15 items)
 
 
CPUMotherboardGraphicsRAM
i7-3930k C1 4.6GHz @1.344v Sabertooth X79 2x EVGA GTX 560 Ti SC SLI 900/2106 Dominator 1866 16GB 9-10-9-27 
Hard DriveHard DriveCoolingOS
Crucial M4 64GB 'Cuda 320GB XSPC Rasa 750 RX240 push/pull + Alphacool UT60 ... Win 7 Pro x64 
MonitorMonitorMonitorKeyboard
Asus VE198D 19" Samsung 920NW 19" Samsung 906BW 19" Logitech G510s 
PowerCaseMouseMouse Pad
Corsair HX850M Carbide 400R Cyborg M.M.O. 7 Corsair MM200 
AudioOther
Bose Music Monitor Nuforce Icon HDP 
CPUMotherboardGraphicsRAM
Phenom II x6 1090T BE Sabertooth 990FX Radeon HD 5770 1GB Corsair Veangence Blue 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB  Lite ON 16x DVD-R/RW ThermalRight Silver Arrow Windows 7 Professional 64 bit 
MonitorKeyboardPowerCase
Syncmaster 921BW 19" & Syncmaster 965 19" and S... Apple aluminum wired keyboard Corsair TX650 Silverstone TJ05 with window and thermal contro... 
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logitech mx air None Monsoon MM-700 
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post #4 of 5
Thank you for the info. I just know that the tubes can hold a charge for quite some time and that they are very dangerous if not properly discharged.

I appreciate the informative info.
post #5 of 5
Thread Starter 
I also forgot to mention it is LCD and not CRT.
I tried to power the monitor on, but nothing happed and the blinking still occured. The monitor has only started blinking since its not been working correctly when powered, as i switch of the power every night and whenever i go out, and it has not happend once.
    
CPUMotherboardGraphicsRAM
i7-2600K Asus P8P67 Nvidia MSI 560TI Hawk 8GB G.SKill Ripjaws 1600mhz 
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250gb Hdd + 500gb + 1Tb Sata LG Drive Win7 Pro 64bit LG Flatron E2260 + LG Flatron L194WT 
KeyboardPowerCaseMouse
Logitech EX100 650W Coolmaster Thermaltake Armor+ Mx Logitech G9x 
Mouse Pad
Razer Goliathus 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7-2600K Asus P8P67 Nvidia MSI 560TI Hawk 8GB G.SKill Ripjaws 1600mhz 
Hard DriveOptical DriveOSMonitor
250gb Hdd + 500gb + 1Tb Sata LG Drive Win7 Pro 64bit LG Flatron E2260 + LG Flatron L194WT 
KeyboardPowerCaseMouse
Logitech EX100 650W Coolmaster Thermaltake Armor+ Mx Logitech G9x 
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Razer Goliathus 
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