Viewsonic Optiquest Q91b 19'' LCD monitor goes blank. Power light goes off. I unplug 120VAC from monitor. I plug it back in and display is ok again. Sometimes I can get it back by just jiggling the plug at the monitor. I have tried a new 120VAC power cord and get the same negative results. The power cord plug is a female D connector.Will a defective internal power supply act this way or is it truly a connector mating problem?
It is the capacitor on the power to the monitor. I have replaced about 5 so for. The capacitor is like 69 cents. Open it up and look at the circuit board where the power plugs into and see if any capacitor are bubbled up. If so then its a bad capacitor.
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Isolate where the problem is: it could be the LCD display or the graphics circuit on the main board. Connect the VGA output of the laptop to an external monitor - one that you know is good. From the function keys, activate the VGA output of the laptop - it's suppose to switch between the LCD display or to the external monitor. Switch it to the external monitor. If the external monitor works, then you have a problem with the LCD display of the laptop.
Make sure that the video card (if you have one) is firmly inserted into its slot.
Make sure that the connector from the monitor is firmly plugged into the CORRECT video slot on your back panel... Your video card may support more than one monitor and you may have it in the non default port.
Also make sure that the video driver is up to date or even installed.
As much as I hate to say it, there is also the possibility that the monitor is bad.
I have sucessfully repaired three I-Inc CY199D monitors which all had the same problem.
The monitors program is stored in a 24LC16B which is a 16K serial EEPROM in a SO8 package.
The bad part is you have to remove this eeprom to program it as it is write protected on the board and you will need a serial EEPROM programmer and an uncorupted program I have all the above.
If there is enough interest I could offer preprogrammed EEPROMS or a repair service for the graphics card..
The display settings are not valid with the monitor. Either you are using a new monitor or you have changed the settings. If you are using a new monitor, swap with the old monitor and configure the appropriate refresh rate for the new monitor.
If you have changed the settings you may need to either reset all default settings, or setup a parallel unit and use the same key strokes to change the display settings on the problem unit.
This may be the problem with the WYSE driver. Ensure that correct driver is intalled and colour profile is compitable. Syncmaster is auto detected by window based OS.the message "Sync out of range" comes due to improper out put video signal.