Question about Optiquest Computers & Internet
The on off switch is useless. I turn it on and it goes off, then comes back on, and off...... After shutting down the whole system and monitor, I can come back in a few minutes and see the monitoe has turned itself back on?
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Posted on Jan 02, 2017
SOURCE: Gateway Flat Screen FPD1830
My Samsung 215TW started flickering like a strobe light when I would turn it on... then after a while, the speed of the flashing would change, and eventually, it would go out. After turning the unit on/off several times, I could get it to stay on, but after a while, it would start to get odd video noise (strange colors appearing on the screen), and then it finally quit.
Once the monitor went dead, I noticed that I could still see the image on the screen, albeit very dark, so I took my desk lamp, and placed it next to the screen, and I could see that the monitor was still active, meaning that there was an actual image on the screen, it was just that the fluorescent lamp that lights the screen was not staying lit.
I got tired of waiting for Samsung's customer service (thats a story all within itself), so I took the monitor apart in search for the problem (I am an electrical engineer and electronics specialist). I saw that there were two circuit boards, one being the power supply board, and the other being the video signal board. Knowing that there was still a video signal present, I focused on the power supply board, as it contains the transformers to ramp the voltage up to the necessary voltage to light the lamps.
I instantly noticed that several of the radial electrolytic capacitors on the board were bulging and looked like they had swollen and then blown. There are 5 caps on my monitor that needed to be replaced: (1x) 47uF/50V, (2x) 820uF/25V, (2x) 330uF/25V.
The 47uF and 820uF caps are on the power supply side of the lamp power circuit, and the 330uF caps feed the control signal into the IC chips that control the ballast of the lamps themselves, one for the upper lamp, the other for the lower lamp.
Once I replaced these units, my monitor started functioning correctly, and I dont have to give Samsung my absolute most favorite monitor ever for a refurb unit that most likely will have 15 dead pixels on it (mine has ZERO).
Posted on Dec 08, 2008
Sounds like the computer is shutting it down and the monitor is fine. Check for viruses then check your settings in device manager for the screen saver and power down (screen off) options.
Posted on Aug 10, 2009
Does the power light stay on? If so, you have an inverter problem. If the power light goes off, you have a power supply problem.
Posted on Sep 02, 2009
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