Question about Dell 1704FP 17" LCD Flat Panel Monitor
I'm a noobie and have been successful at fixing a few LCD's with standard through-hole components, but this 1704FP LCD has quite a few SMD's, something I had not encountered before. It all started with a no power indication. Opened up the case and found power supply components to be ok, resoldered in places that looked marginal, and replaced the four shorted FET's in the topside of the inverter section. Powering up the board by itself, I got the following voltages at the output diodes (mounted on heat sinks): 5.3v, 12.7v, and 20.0v. On the connector P802 with the wires that connects the main board: pins 1-3, 5.3v; 4-7, 0v (grd), 8-10, 0v. With such encouraging results, I reconnected everything and repowered to get the power led to light up and for a few seconds show the OSB on the screen. By examining the underside of the board where the SMD's are found, resistors are easy to identify but condensers are not marked. I was also able to read the markings on the following three SMD components which I don't have details for: On the inverter side of the board, I801: SG6841SZ, KMA233305490g On the power supply side, I101: OZ9930g, S1090122T, 0S46A Q804: 13N06L Markings on the Power-Inverter board: 6832151100-02, PTB-1511, 8/19/05. Without a schematic and very little information on this model, it's hard to make much progress. The problem still seems to be in the inverter. Another burning question is: are SMD components fairly easy to get and remove/install? Your insights and help to resolve this problem will be much appreciated. Thank you.
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Posted on Jan 02, 2017
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
Hello...I recently opened up my Dell E173Fpf monitor because the screen went black, yet the power button was green. I thought it was a capacitor problem. But before doing anything I gave the board a thorough inspection, looking for anomalies. I observed a substance, (later identified as silicon) puddled around the power connections. I gently removed the semi rigid stuff and didn't touch the capacitors as I had originally planned. I partially reassembled the monitor for a test run and it worked again. (Being 9 years old, I don't know for how long...) Only thing I can think of is that a spill happened at the factory and over the years it gradually "melted" to puddle around the wires behind the power input. (Weird, but that seems to be what happened.)
Posted on Dec 05, 2014
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