Monitor keeps turning off with power light on

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kanucks25

Honorable
Mar 19, 2014
20
0
10,510
Samsung 2233BW

Hi,

Recently my screen has been going black but the power light stays on. It comes back when I switch it off/on, but then it'll go black again randomly.

I googled it and learned that turning the brightness down fixes the issue. It did stop going black, but on low brightness the screen flickers and the monitor also makes a weird clicking noise.

I'm assuming the problem resides inside the monitor with one of the parts. Any chance I can find a cheap, easy solution for this or am I going to have to buy a brand new monitor? Keep in mind that I have no experience working with electronics so a complicated fix may not work for me.

Thanks!
 
Solution
InvalidError
I usually get my capacitors from DigiKey. When you take your monitor apart to see what sort of caps you have in there that need replacing, pay close attention to the lead spacing, cylinder diameter and height - you do not want to order capacitors that don't fit.

You obviously also need to write down the voltage and capacitance ratings too - your replacements have to be the same or higher for both of those ratings.

You want to aim for low-ESR, low-ESL caps (less than 0.02 ohms at 100kHz) and preferably models rated at 105C like Panasonic's FR series.
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InvalidError

Titan
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May 18, 2007
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If you have a somewhat old LCD with CCFL backlight, either the lamps or the inverter is dying.

If it is the lamps that are starting to die, they usually have trouble lighting up but the flicker and noise goes away after the lamps have had time to warm up until some day the lamps won't turn on at all anymore. If it is the inverter, then symptoms can vary wildly depending on exactly what the problem is, and may (or not) go away as the unit warms up.
 
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kanucks25

Honorable
Mar 19, 2014
20
0
10,510
I don't think think warming up will fix it because the monitor/computer has been on all day.

If I have the brightness over 20% it turns off in like 30 seconds or less. If I have the brightness close to 1%, it stays on, however the aforementioned flickering is giving me a headache pretty quick.

Keeping the brightness low then increasing it keeps the monitor on for a bit longer but it does eventually turn off again :(
 
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K

kanucks25

Honorable
Mar 19, 2014
20
0
10,510


Thanks for the video. I'll definitely open it up and see what's what.

Any idea on a good cheap and reliable site to buy these little electronic pieces?
 
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InvalidError

InvalidError

Titan
Moderator
May 18, 2007
23,815
5,265
108,890
I usually get my capacitors from DigiKey. When you take your monitor apart to see what sort of caps you have in there that need replacing, pay close attention to the lead spacing, cylinder diameter and height - you do not want to order capacitors that don't fit.

You obviously also need to write down the voltage and capacitance ratings too - your replacements have to be the same or higher for both of those ratings.

You want to aim for low-ESR, low-ESL caps (less than 0.02 ohms at 100kHz) and preferably models rated at 105C like Panasonic's FR series.
 
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