Question about Samsung SyncMaster 740N 17" LCD Monitor
Samsung 740N began buzzing at startup, otherwise normal function, buzzing faded, unit continued operating as normal. Then suddenly, screen went blank, power indicator light is on. No buzzing. Currently not connected to VGA, but but there isn't a "no signal" message - nothing.
Suspect backlight power system. ("ballast"). Also help to disassemble and replace part(s).
That sounds like a capacitor or maybe a mosfet died. Usually only capacitors 'sing'.
first you need to confirm it is the backlight section that died. simple visual inspection. You want the monitor plugged into a running booted computer. If you have anything that will do dual screen that lets you know what and where something should be on the screen being tested.If not anything will work. Let the computer boot up and then you will need to get close and near an edge. What you are looking for is a ghost image of the normal desktop. You may even be able to see the mouse move around. This is the actual picture produced by the lcd. It is very faint. The backlight acts somehwat like a projector bulb and shines through the lcd panel. So if you can see anything then your backlight or the backlight power are the problem. I'm in BC so its hard to reccomend any place for parts. Most of the ones I have fixed the parts were out of California.Cost should be about $70-$100.
If the backlight isn't the problem then it is usually a power section problem. The parts are cheap but the time to find the bad one can cost a bit. If you can find a place to fix it get an estimate. Then check out the replacement price of a new monitor. The prices have dropped and sometimes it isn;t cost effective to repair even a backlight on some models.
Posted on Apr 26, 2010
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Posted on Jan 02, 2017
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