Dell E173FP 17" LCD Monitor Logo
Posted on Apr 14, 2010
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The LCD monitor has no display, totally black.

Good day sir,...I repair the LCD monitor of injection molding machine. PLANAR ( EL640.400-CB1) is the model number, i replace all deffective capacitors, its working but after few minute, the monitor suddenly "off" and "on" until it was totally black. the regulator ic was also very hot. Pls.. what is the main reason why its happen?

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Bud Martin

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  • Master 11,361 Answers
  • Posted on Apr 14, 2010
Bud Martin
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May I ask if you verify that all the caps are installed back in with correct polarity, caps are 105C and LOW ESR (a must). How hot does the inverter transformer driver Transistors/IC get, or just the MOSFET for the switching tranformer driver is getting hot. The IC/Transistor will egt hot if it is not running at the correct frequency as designed. I could not find any free servie manual for this model, perhaps you can provide the model and th number from the board it self so I can try looking up the sch. for it. Pictures will help, [email protected]
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague

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It has white screen becuase it may not be getting the 5vdc from the logic board to the T-CON board or the board has blown fuse.
Please see http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/

Also look to see if power supply/logic bd had any bad caps also.
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Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses, 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 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
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That is the symptom of failed T-CON board (part of the LCD panel assembly, new panel will be needed), you can try reseating the ribbon connector on the LCD panel first.
This what T-CON board looks like:
http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/


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Hi...there
Sure, you can fixed by replaced the backlight inverter or repaired it.
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