Question about Dell UltraSharp 1800FP 18.1" LCD Flat Panel Monitor
I suspect my power supply also went bad. Using an Ohm meter I found 3 capacitors with infinite resistance, but I do not know if this means they are necessarily bad and leaking. I want to test the ICE chip, since this is the most common problem of these power supplies, but I do not know how. If this post could be directed to RoboTech, who seems the most experienced on this issue, it would be much appreciated.
8 pin IC chip will not "pulse" to tell the main IC that the power pack is ok , replace this and the monitor will power back up
I believe the IC begins with an A it is a small bugger right in the middle part of the power pack. I am typing this note on one I repaired last week.
Posted on Apr 03, 2009
The best way to get this to Robotek is to go to the home page and select find experts. Locate his name and use the ASK ME option. I will forward the link for this string to him as well.
Posted on Jul 02, 2008
I is likely that you wont need a circuit diagram to fault find the power supply. Switch mode supplies are difficult to diagnose as they either work or they dont, making them hard to diagnose Experience and information are your best assets here. Testing an integrated circuit can be even harder. Replace the device and see.This is how we do it in the real world. The capacitors you mentioned as having infinite resistance. This is generally ok if you are just looking for shorts. A capacitance meter should be used to check if they cap is actually functioning to spec. If you are unsure, just replace them, they cost a few cents. There is a company that sell reworked power supplies here. Or do a search on ebay, to locate the chip, or new power supply.
I am more than happy to answer any other questions you may have aboutit, please get back to me here, or use the ASK function to go straightto me :) If you are still unsure, have problems, or we need to look atthe situation more deeply, then before you give a rating for thisadvice, hit the ASK buttonThanks for using FixYa, If you consider the advice I have given you assound, a FixYa rating is a great reward for my efforts to help you.Cheers.
Posted on Jul 03, 2008
Tips for a great answer:
May 01, 2011 | ASUS VH232H 23" Monitor
Basic LCD monitor and TV troubleshooting guide:
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.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.
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