Having problems with your Gateway FPD 1730 17 in. Flat Panel LCD Monitor ?

Gateway Monitor We have a Gateway 17'inch LCD monitor and in no particular sequence the monitor will blink on and off, and go completely black and the green power light will also go off. We have changed the power cables and this still has not solved the problem. What else could be wrong?


Answers :

Unfortunately, the power supply is internal to the monitor\015\012and this is the likely problem. 
\015\012\015\012It is of the 'universal' input type that is compatible with\015\012a range of  90-264 VAC 50/60 Hz indicating that it is a 'switched\015\012mode power supply' and these have a design problem that makes the reliable\015\012operation of the supply doubtful unless a certain weak point (electrolytic\015\012capacitors in the feedback path) is properly attended to.
\015\012\015\012The run-of-the-mill capacitor in\015\012this useage is subjected to high ripple currents which can cause a cheap\015\012capacitor to chemically break down, dry out and then finally fail to pass\015\012enough signal to keep the supply running or enable it to start up.
\015\012\015\012 
\015\012\015\012If you are adventurous, you can\015\012open the monitor, examine the components near where the AC power cord\015\012terminates and look for vertically mounted, cylindrical parts with shrink wrap\015\012bearing the values and an exposed, scored, aluminum top.
\015\012\015\012Sometimes, the top will bulge or\015\012the 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. 
\015\012\015\012The values of these parts will lie\015\012between 4.7 to 100 uF with voltage ratings of 6 to 35 VDC.
\015\012\015\012Defective parts need to be\015\012replaced with special capacitors that are rated for high frequencies with low\015\012losses. These parts cost a few pennies more and most companies don't seem to\015\012care about the eventual failure of the inferior parts since it will typically\015\012happen after the warranty expires.      
\015\012\015\012 
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