Question about Samsung SyncMaster 931B 19" LCD Monitor

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When turning on,screen flashes on and off repeatedly,I have to keep turning the monitor on and off several times before the screen actually keeps a picture

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Please check the caps in the power supply section first.
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, poor solder jopints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed SAMSUNG monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Posted on Jun 03, 2010

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The monitor keeps flashing from analogue to digital for a bit, then 'Check signal cable'


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this is in the monitors manual that came with monitor
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Hello,

If you turn the monitor off then about 1020 sec turn it back on and have a picture for five sec again it sound like the power supply in the monitor. but if that did not solve the problem, the picture board on your monitor is bad, since it goes off after few seconds and the power led or button is on, it means the picture board of your monitor has developed fault and will need to be replace.

I advice you replace the picture board on the screen of your monitor to solve the problem of the blank screen.

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This is a problem with the power supply unit inside the monitor, there is no easy way out here. If you keep on using your monitor like this eventually it won't switch on no matter how long you wait. Keep on using it like this for the time being without switching off anything but ultimately you will have to take it in for repairs or otherwise purchase a new screen..

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Flashing on and off


Is the monitor a LCD monitor and does it uses a power adapter?
If this is the case then it could be the power adapter that is faulty or if it is underpowered and the thermal overload cuts in then it switches off and when it cools it switches back on again.
Check the monitors power specs and the adapter should match the power requirements of the monitor or greater (ie. the voltage should be the same but the current rating should be the same or greater).

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I was having the same problem.
I solved it by replacing the two 47µF capacitors on the power supply/inverter board.
I actually removed all the capacitors (around 13) and all checked out fine except for the two 47µF.
I forgot to take pictures or even write down the capacitor label on the board.
They are located close to the logic board connector

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The monitor turns off and on repeatedly.


does sound like a power supply issue... they are fixable but it's somewhat involved.

Robert

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Unless there is inadequate ventilation, your monitor could remain on all the time with little ill effect. Actually turning on and off your monitor actually puts more strain on it then leaving it on all the time.

If the gateway screen is displayed for a moment and then just turns off, I believe the inverter board inside the monitor has broken.
What's actually happening is that somewhere in the board more voltage then needed is "leaking" in and the safeguards on the board turn it off to prevent damage.

I would go and get an estimate from a shop. If the price is within 30-50 dollars of a new monitor, get a new one.

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