Question about Gateway 700g 17" Lcd Monitor
SCREEN BLACK BUT CAN HEAR BOOTUP POWER LIGHT ON MONITOR BLINK FIRST AND THEN STEADY BLUE BUT STILL BLACK.... USE MOUSE AND KEYBOARD....UNPLUG AND REPLUG EVERYTHING CHANGED BLUE CABLE CORD
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: Gateway Monitor
Unfortunately, the power supply is internal to the monitor
and this is the likely problem.
It is of the 'universal' input type that is compatible with a range of 90-264 VAC 50/60 Hz indicating that it is a 'switched mode power supply' and these have a design problem that makes the reliable operation of the supply doubtful unless a certain weak point (electrolytic capacitors in the feedback path) is properly attended to.
The run-of-the-mill capacitor in this useage is subjected to high ripple currents which can cause a cheap capacitor to chemically break down, dry out and then finally fail to pass enough signal to keep the supply running or enable it to start up.
If you are adventurous, you can open the monitor, examine the components near where the AC power cord terminates and look for vertically mounted, cylindrical parts with shrink wrap bearing the values and an exposed, scored, aluminum top.
Sometimes, the top will bulge or the base at the board may show signs of crystalline deposits.
If you find no parts that appear as described, the alternative is to find a tech who owns a capacitance meter with DF (loss) function. So equipped, the failed part is fairly easy to find.
The values of these parts will lie between 4.7 to 100 uF with voltage ratings of 6 to 35 VDC.
Defective parts need to be replaced with special capacitors that are rated for high frequencies with low losses. These parts cost a few pennies more and most companies don't seem to care about the eventual failure of the inferior parts since it will typically happen after the warranty expires.
Posted on Sep 12, 2008
wjfarm48, Sure sounds like a power supply problem. How old is it? How many hours of use? Do you understand what a switch-mode-power-supply and an inverter supply is? If not, then here are your options. Check with Gateway to see if there is a swapout program. You box up and ship them your monitor+cash, and they return a REFURBISHED same model with new CCF tubes and inverter/SMPS. When you box up the monitor, follow this lead. "A 3 inch thick layer of breathable air shall be the only thing touching the lcd front panel" Next option is find some local TV/Monitor repair guy who can get parts and or replacement boards/CCFtubes from Gateway. Last but not least, is to repair yourself. Not Recomended.. But do a search on lcd monitor repair or Bad Capacitors In LCD Monitors or Repair of SMPS in LCD/FPD Monitors. Also check for videos on YouTUBE related to lcd monitor repair just for your own info. Here 's what you are dealing with. The light that makes your FPD bright white is generated by Cold Cathode Fluorescent Tubes (2) that require 600-1200vac at high frequency that is generated by an INVERTER which gets 12-24vdc from the SMPS. Almost the same technology is used in the new style screw-in curlie-que Compact Fluorescent light bulbs. Only they call the inverter a electronic ballast. Anyway, thats about all the info I have. Let me know how you make out in you quest to get your LCD up and running again. I'm louie12fix on fixya or lmistyrel@ aol.com BYE for now.
Posted on Apr 03, 2009
It could be a faulty power cord. Try plugging it in and moving the cord around in the areas where it takes the most movement. Do the same with the data cable to see if you get a response there. If your cables are fine, the problem is most likely hardware in the monitor - in that case you're better off replacing the monitor.
Posted on May 06, 2009
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