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What Should I do with Good 23" LED Monitor Screen; Just Bad Computer Board on it


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#1 F-1DeskLamp

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Posted 31 December 2017 - 07:53 PM

I have an LG Flatron E2342v-BN 23" flat screen LED monitor that I picked up for free because it was just turning on and off.  

 

I looked into it, and the LED backlight is good, the long, narrow computer board on the back of the screen is good, and everything is good....

....except for the main computer board.

 

The main computer board makes a rising and "snapping off" hissing sound, and when the "power button computer board" and the "LED backlight" is connected to the mobo with power running in it, the screen and power button is lighting up and clicking off.  Also when the everything is disconnected from the mobo except for the power, the mobo is making that hissing noise that rises and falls off over and over which controls the on/off action on the rest of the monitor.  

 

 

What could it be, and how could I test it?  

Because I see the capacitors are all good, and there are no soldering points that are bad, crossed, broken off, and all of that, I believe the mobo is shot.  

 

But it's a very good monitor besides the mobo, so I'm wondering if I could find a cheap mobo to install into it, and make it useable on the computer.  



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#2 Platypus

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Posted 31 December 2017 - 10:14 PM

There should be a part number visible somewhere on the board, beginning with 3 letters like EAX or EBT followed by 8 digits. A search on that number might find a good used board available.

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#3 mightywiz

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Posted 02 January 2018 - 04:00 PM

just cause the caps look good doesn't mean they are.  they could be going bad and just haven't swollen up or split open yet.   you probably still just have bad caps. only sure way to check a cap is to pull it and use a LCR meter or ESR meter to verify if it is truely good or bad.






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