Question about Xerox XG-91D 19" LCD Monitor

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I own a XG-91D monitor that the screen goes black after about 5 seconds. I found 2-470uF 25V capacitors on the power supply board that were leaky - replaced them but the problem still persists. There were 4-1000uF25V caps that looked and measured ok (using a capacitance checker). Any advice would be appreciated. Thanks Tom

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Most cap meter does not have the ESR measurement function, the cap can look OK but it can have high ESR. Did you replace the bad one with LOW ESR, 105c type such as PANASONIC FM or FC series from DIGIKEY?
When the filter caps went out it may have taken out the components in the inverter circuits with it also. Check the transistors/Ic, inverter transformers.

http://s807.photobucket.com/home/budm/allalbums
http://www.badcaps.net

Posted on May 12, 2010

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1 Answer

Monitor will not light up


Some capacitors looking flat are blown off inside. (Should check largeest one too)
Use a tester to check the, again, first.
If you can see light on power button (some do), then should replace main board.
However, if monitor use a power supply looking an adapter type like laptop, check it also in case.

Jun 21, 2013 | Xerox XG-91D 19" LCD Monitor

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Hello,

These are great monitors but the power supplies have a bad habit of failing. We have an article posted on our web site at: http://www.ccl-la.com/blog/index.php/xerox-xg-91d-monitor-repair/ That shows what goes out, how to get to the boards and a full parts list to do the repair. If you don't want to do the repair yourself we do offer a repair service, that information can be found here: http://www.ccl-la.com/blog/index.php/service-request-form/ If you have any questions please let us know.

I hope this helps, if so please rate our solution.

CCL_Tech
Corporate Computer
www.ccl-la.com

Apr 30, 2010 | Xerox XG-91D 19" LCD Monitor

1 Answer

My Xerox XG-91D LCD Monitor start, display briefly (about 1 or 2 secs) then goes back. any solution in this case? mention that i use with a dvi-i adaptor on a vga graphic card. thx


I would try VGA to VGA hook up first to narrow down the problem before start taking the monitor apart.
Most common failure 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). See example of failed monitors to get some ideas of what goes wrong: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further.

Apr 01, 2010 | Xerox XG-91D 19" LCD Monitor

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Xerox XG-19D LCD monitor goes black in 5 seconds


You may also have to check the IC/Transistors Inverter transfomer drivers, also should Ohm out the resistance of the transformers.

Mar 18, 2010 | Xerox XG-91D 19" LCD Monitor

1 Answer

I own a XG-91D monitor that the screen goes black after about 5 seconds. I found 2-470uF 25V capacitors on the power supply board that were leaky - replaced them but the problem still persists. There...


Hello,

Replace thee 1000uf caps too. A capacitor meter will not test the ESR ( equivalent series resistance ) of the caps the cap meter will show them to be good but an ESR meter will show then to be bad. Also be sure to use low ESR caps. If you use general purpose aps like from Radio Shack it can damage the board board because of the ESR rating. The temp rating needs to be 105c or the new caps will blow out within a month because of the heat in the monitor case ( No fans ).

I hope this helps, if so please rate our solution.

Buddy
Corporate Computer
www.ccl-la.com

Mar 17, 2010 | Xerox XG-91D 19" LCD Monitor

1 Answer

My Xerox XG-91D has gone totally black. No leds light up when I plug it in. The power supply is separate from the monitor itself. The power supply led does light up when I plug it in so I know that it is...


This could be a back-light problem, it can be caused by a faulty inverter board which supplies high voltage to the CCFL lamp or the CCFL lamp is faulty. The CCFL lamp is a mini fluro tube.
Check LCD Parts for service, parts, and DIY info - click on this link to their WEB site :-
www.lcdparts.net

Oct 25, 2009 | Xerox XG-91D 19" LCD Monitor

1 Answer

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It is most likely that the filter capacitors on the power inverter board have failed. I took mine apart and found seven swollen capacitors on the this board, they fail prematurely and seem to be the only thing wrong with the unit. I replaced them and now it is working just fine.

six 470uf 25v electrolytic capacitors and one 220uf 25v Capacitor.

you should not attempt to repair this yourself unless you have some electronics training since there is a shock hazzard involved and also these capacitors will blow apart if they are installed incorrectly (very messy experience).

Jan 31, 2009 | Mag Innovision 19" LCD Flat-Panel Monitor...

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Xerox XG-91D


Faulty capacitor(s) has ben mentioned by a computer repair man elsewhere in these solutions. I returned mine to the factory and was told they replaced an 'inverter' ? 

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Just tore mine apart so here is some help. You need to remove the two screws on the back of the case on the bottom. Then you remove the front cover it slides toward the top of the screen then lifts off. You can pry it off if that doesn't work. If you want to seperate the screen from the back cover you then need to remove the swivel mount and the other two screws from the back cover.

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