Acer x193w + display problem

[jviers]

Greetings!
I'm having trouble with an Acer x193w+ LCD display. I've looked over the forum offerings (awesome) but not found my exact problem.

When I turn on the monitor it will run for a while then I'll get flickering and an overall lightening of color. This will come and go but enough such that the monitor is not usable.

I have examined the caps as suggested in forum postings and can see that two are slightly bulged (C1 and C302). I will replace these, and the C305 and C307 but I think my problem may be a little different. I am atttaching a photo of a discolored component, C66, near the Niko 252 transistor. The componenet, which I thought was a resistor but as marked C66 it must be a cap (?), looks quite burnt and no markings are readable on the heat-bubbled top. Putting a meter on it I get no resistance readings (I don't know how else to check). I would like to try my hand at replacing this tiny part (along with the aformentioned caps)--can anyone point me to the right part number of C66or some specs? Or, any other ideas? I will of course keep exploring the forum posts too.

Here is the part circled in red: http://www.liricaservices.com/graphics/Darfon.jpg

Thanks much; cheers, Joel

[selldoor]

Re: Acer x193w + display problem

Hi - some of the active members, including myself would prefer it if you posted your pictures using manage attachments. - (perhaps edit your post and add it)
C66 is a small ceramic cap - it may have been hand soldered from new or someone has replaced it. The "burn" might be just flux or a marker pen where someone has checked it is fitted - are there any other markings that colour on the board. (sometimes a line of checkers ticks). Try cleaning it with isopropyl alcohol.
They do not leak or bulge and if really burnt disintegrate. Unless you or someone can find a schematic it is difficult to put a uf value on these and most people just go by size. If there is a data sheet for the niko 252 it might have a suggested use wiring diagram which might include the cap.

I can suggest nothing at the moment for your problem but await the outcome of replacing the caps you mention.

[budm]

Re: Acer x193w + display problem

The components are running hot (PCB truning dark brown) due to poor DC filtering because of the bad caps, I owuld suggest to replace a set of caps isnce bad cap can look normal. Poor DC voltages can cause a lot of starnge symptoms.
Use Panasonic FM series caps.
http://search.digikey.com/us/en/cat/...panasonic%20FM

[jviers]

Re: Acer x193w + display problem

Thanks for Replies, I appreciate it!

I went ahead and ordered a set (five, if I recall) of replacement caps and so far it is back working well.

I hate to throw "good" things away and have gotten good microwaves, stereos, computers, etc. from folks who thought the equipment was toast.

[Rehmath]

Re: Acer x193w + display problem

Hi, this may be a bad or loosen flex cable attached between circuit board and LCD connector. Check it while it is on power. But, Please DO NOT ATTEMPT to test it if you are not familiar with testing circuits on power.