Question about Dell UltraSharp 1800FP 18.1" LCD Flat Panel Monitor
My LCD monitor Dell 1800FP shows no lights when powered on, and seems completely dead. I read some posts on the web, opened it up and measured voltages at the power supply output pins. Both 5V and 12V measure fine. Any suggestion on what else I should try? Thanks! RJMPLS
I just repaired 3 1800FP's - all dead, no lights.
Firstly a dead 2AS01 is 95% of the problem, because some fool designer left out the protective zener diode - cheapness.
Mouser Electronics does not have this part, but lists it at 37 cents in lots of 2500, and gettable at $2.66 somewhere else.
You must also replace the two small value electrolytics near this IC, as some had an ESR of 40 where <0.5 is where it should be.
I suppose as the electro's dry out, the spikes can zap the IC. The quacks on ebay flogging 2sa01's alone, probably hope to sell you another one down the track (at a fat markup).
There are 2 'Sam Young 2200uf' electros that really should be replaced, with ESR or 2-30 ! Ideally replace ALL electros, as the others will be off - but those 4 as a minimum and using a jewelers loupe, resolder other joints on the transformer and anything that looks more dull silverish, than the rest. A 1 inch used and worn paint scraper will get the case open easy.
DANGER, CAUTION : Finally when refitting the inverter board, ensure the steel tab is over the TOP middle of the board facing away from the power socket (SO YOU CAN SEE IT) . The board sides in flat. It is possible to scew the board down with a slight bend, with the tab pressing over the pcb tracks - very , very bad!
Now all I need is for some kind soul to improve the fix by stating what the value of the missing zener should be.
PS. Just because the caps are not bulging does not mean they should be OK. Most wrecked 10 year old power supplies have better ESR's, so the electronics must be hot under the cover.
I have seen bulging caps with a GOOD ESR, and non bulging ones with an ESR of 47.
Posted on Aug 28, 2008
I purchased the ICE2AS01 8-pin DIP chip from ebay and resoldered the TO-220 diodes that are attached to heatsinks. Everything works fine now. http://thriftyvegan.com/1800fp/repairinfo.html I purchased 3 chips just to have some on hand as they are discontinued. Paid around $20 total. Thank you Alex Belenkiy
Posted on Aug 20, 2007
Hi, simply replacing the ICE2AS01 and resoldering diode packs is not really good enough, it will work, but will fail again. Failure is, the solder connections stress/fracture and causes the ICE2AS01 chip to burn up. Most people that sell you the ICE2AS01 replacement chip do not give all the instructions you need, and do nothing to address the reason why the solder connections fail in the first place. Failure to properly fix it may cause catastrophic failure of your main logic board the next time it fails. For more information on this chip availability, please see our web site, www.resurrectek.com We sell chips and power supplies. Also. checking the power supply with a meter will not likely show if it is really good or bad, if the solder connections are cracked, it needs refurbished no matter what the output reading are. Regards, Mike
Posted on Feb 26, 2008
Thanks to all you help guys,this realy worked
Posted on Feb 23, 2008
Help mi ZD901-R928-R924-ICE2ASO1-11NM60- SVEMIJE CRKLO NABAVIOSAM IC TRANZISTOR AL DIODA IOTPORNICI SU MI PROBLEM NAJVECI DIODA ZD901 NEZNAM KOJAJE UBACIOSAM ZENERICU 7VOLTI AL NEMAM NORMALAN RAD KOLO OSCILUJE SVESAM PROVERIO [email protected] SERBIA MONTENEGRO TENKSS
Posted on Nov 12, 2007
I have had the exact same problem. I was told by a guy on ebay to check the smartboard main micro. I think that I will be replacing the smartboard for $35 on ebay.
Posted on Jul 12, 2007
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