Question about Dell UltraSharp 1800FP 18.1" LCD Flat Panel Monitor

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I have a Dell 1800FP monitor. I get no power lights at all

I have opened the unit up for a quick inspection of the power supply and here is what I found.

I have checked the AC through the full wave bridge - it is good.
I have 165 Vdc all the way until Q902 ( which I am assuming is a SCR??

Could the problem be in IC 901??

Does this power supply need to be loaded to get the 5 and 12vdc outputs??

I have hooked it up on a bench with no loading.

Any help or schematics of this thing would be appreciated

Thanks Rob

Posted by on

  • oceanaccess2 Jan 29, 2009

    why is it so difficult trouble shooting a power supply?
    I can do it without a schematic by ohming out the components one by one if necessary. A schematic just makes it that much easier. Once it gets to an IC and not a discrete component then that is a different story. I would rather replace a $1.00 transistor than the entire powersupply




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  • Dell Master
  • 1,183 Answers

Hi,
finding the fault in power supply is bit difficult , as it either works or goes bad . You can check this website for reworked power
supplies.
http://resurrectek.com/osCommerce/

Thanks
proton

Posted on Jan 29, 2009

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You should at least finr out if your are getting the 12vdc at the power supply output connector.
Replacement power supply module:
http://lcdrepair.us/1800fp-power.html

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
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http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

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Please leave rating if it helps.

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More likely to have failed power supply due to bad IC in the power supply. You can buy the repair kit or new power supply, you should check for the 5vdc and the 12vdc first.
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Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
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http://www.lcdrepair.us/1800fp-power.html

http://www.lcdrepair.us/1800inverterKUBNKM045A.html

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http://en.wikipedia.org/wiki/Capacitor_plague
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Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, 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://www.badcaps.net
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Replacement boards:
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