Question about Xerox XG-91D 19" LCD Monitor
I decided to try using a hair dryer to help heat this unit up and it works like a champ, screen now stays on is clear etc. By raising my phase from it's default to 18 or setting my refresh rate to 70 will that help this unit to generate just a bit more heat? I have it set so that it dosen't go off (hibernate) so I won't have a start problem. Any other ideas?
You have a bad capacitor on your power supply board. Take unit apart and look for some blown or bulging capacitors on the P/S board (the tan one) they look like little barrels wiht a cross embossed on top. If the top is split or looks like it is about to, you can replace them easily with a soldering iron, heat the solder and pull the cap out one side at a time. the install is just as easy, put it it phased properly (it has a negative and a positive pin) and heat pin and pad together until solder flows onto them, not more than 5 seconds. Sometimes you can use the solder that is already on there. They are about .35 cents online or 1.25 at radio shack, look for the large ones that say 470 microfarad at 25V and 105C. If you cant find that particular one, you can use a 35V model but stay with the 105C rating so it doesnt fail under the heat of the P/S. Of course you should always take the bad one with you if you are shooping for a new one. You may have 8 bulged caps on your board, replace them all. repair shop should do the soldering for you for a few bucks if you give them the parts and watch him. Applies to most flickering or dead LCD monitors. Other thing to check is the small black IC chips on the logic board to see if any are burned or blistered. That is more involved but is not impossible.
Posted on Apr 11, 2008
More than likely there are some bad caps in the power supply. The backplane power supply and main power supply caps tend to give problems in many of these types of monitors.
You should get it serviced before the cap goes completely defective. If it goes opened or shorted, depending on many circumstances, other damage can happen. This will increase the cost of the repair.
Posted on Apr 14, 2008
Craneman, you are a genius! But I can't stop laughing! I knew from before that this problem was due to a warm-up issue within the monitor's power unit, never would I have thought to use such a primitive solution! I was waiting to bid on a monitor just now so I decided to do a search and found your solution, decided to give it a try, and voila! The hair dryer's heat helped warm the monitor up to the right temperature (I suppose) and the next time I restarted the monitor it came right up!
Posted on Mar 21, 2008
You should NOT have to warm up your electronics! (This is BAD)
One of the components on the pc board in your monitor is BAD and should be replaced.
1. Take it to a qualified repair center.
2. Make sure that they do COMPONENT LEVEL repair! (most dont)
3. Your repair bill should be less than $100.00
My shop charges $68/hr for bench work + parts.
Posted on Jan 18, 2008
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Oct 07, 2014 | Envision Computer Monitors
This is a fault solution which can be checked and corrected by you assuming that there is no component failure. There is a high possibility that the components over a period of heating and cooling, tend to bring on a problem of dry soldering. So my advice is to check the set for some loose joints that have played on to give you these erratic shut downs or poor performance.
The best way to check for loose connections is to tap lightly when the set is powered on , If there is change while tapping then it seems that there are DRY solder joints. Remove main plug, the covers - with caution of high voltage, check for dry joints, use a good soldering iron to solder all suspected points.
Sometimes the fault occurs when the set warms up, if so you can simulate the heat using a hair dryer on the suspected areas, try with the power supply, distribution, Processor controller, driver controllers on the A/V related sections. Also the use a FREEZE-IT spray can simulate the components to cool and show up the fault.
Based on the above method you must be able to locate the area of fault and solder the sections. Sometimes large IC's- ones with more pins- tend to have drying in some pins and so cause faults related to the IC's protocol. Have a rough idea of looking into the areas to reduce the time of probing.
Check for tips to look into the SMPS unit with some of my tips:
Thank you for using Fixya.
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