Question about Xerox XG-91D 19" LCD Monitor

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Faulty hp en623aa flat screen monitor

It simply just dosnt have any power, all fuses checked and there are no problems with the board, what in the world of monitors could it be?
It has 2 circuit boards inside (i think 1 is kind of an on board graphic device 4 this screen) the power 'on' switch is connected to this device' circuit board by 3 wires (and connector) 1 red 1 brown and 1 black, i suspect the red and black have obvious purposes but can any1 tell me what the brown is used for? also any help would be muchly apprieciated, thank you.

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My desk top is half display is ok and half display is white light & all program is look a lite

Posted on Oct 29, 2013


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Posted on Jan 02, 2017


SOURCE: Faulty Monitor?

I had the same problem, dead p.o.s. I enjoy this monitor, it’s one of the few on the market that are completely flat on the face. Great look! I own two, one used off ebay, repaired. Land fill, no fukin way. Found a fellow who can fix the power supply on ebay, $40.00 . I found a fix here on Fixya. Went to radio shack, better to order on line their inventory for these parts is itty *****, the same size capacitors, only $10.00. Inside in the guts of the power supply the capacitors were bulging and leaking.
Pulled them out and amateur soldering popped in the new ones, replaced 4 of the 6 big fukerz. Harest thing was getting the cover off, slight pry and slide up. And whalla! Good as new. Got 5 years on this one XG-91. Suk me Xerox for cheep o Partz! Burn the fuckerz that don’t make things to last!

Posted on May 08, 2008

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SOURCE: Monitor comes on, shows the screen for a second then goes blank

The main problem is here is the graghics card its needs to updated and make sure the pins are alright on the display cable. Also you need to uninstall the integreated one that came with the PC first before you install a graghics card. so right now you need to put the display back to the motherboard display then when you have that done then you put it in the grafics card you have then it should something i had the same promblem for awile i couldnt figure it out either. Hope that works for you. Good luck

Posted on Nov 08, 2006

SOURCE: Xerox XG-91D 19 in. Flat Panel LCD Monitor

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.

Posted on Jan 04, 2007

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SOURCE: I own a XG-91D monitor that the screen goes black


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.

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Posted on Mar 18, 2010

Testimonial: "Very helpful! I replaced all of the caps but still have the same problem."

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SOURCE: 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.

Posted on Mar 19, 2010

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Its either going to be the power board or the main board, My assumption would be the power board since those are the more lilely culprits to go out on those monitors.

Since neither one is readly available, check the fuses on the power board and then also see if there are puffy caps. If there is then replace them with ones that are the same UF rating and same or highter voltage.

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Are you getting any power to the monitor?

There might be millions of reasons.Few of them would be :-

1. In case, there is nothing on the screen.Check the motherboard. If your motherboard is at fault, you would get black screen. Take out and check all the slots in RAM.

2. If your monitor is at fault, might be you have blown few circuits or fuses.Open the monitor.You would see 2 boards. Check the boards for continuity and replace either fuse, Ic's/board.

Note - Make sure if you order any board/ IC's , it must be for the same number as engraved on the boards/Ic.

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Hello mousemilk,

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2 Answers

No display

I have repaired 3 Viewsonic VP211b monitors.
The power light comes on but there is in picture. In all three cases it was the same problem. It was a blown fuse on the inverter board.
1. The monitor must be opened: The black plastic back is pried off carefully. It is easy to damage or crack. This will expose the electronics.
2. Remove the metal covers: The power main board has a metal cover that is secured with 4 screws. When that cover is removed, you can then remove the cover over the inverter.
3. Remove the inverter: The inverter is held with 1 screw. There are a total of 6 pairs of wires to the fluorescent lights (3 on each side) that must be disconnected from the inverter and a there is a power and control cable to the main board that must be disconnected. The inverter should now be free.
4. Test the fuses: On the inverter there are two tiny surfaced mounted fuses, labeled F1 and F2. They are on either side of the power cable CN1. Either one can be blown. Test them both with an Ohmmeter.
These fuses are 1.5 mm long, 1.0 mm wide and 0.5 mm high (Case Style 1206). They have the letters FN printed on them. The N is for 2 Amps and the F is for Very Fast Blow.
I replaced them with the same fuse, except Fast Blow rather than Very Fast Blow. The replacement fuse has just the letter N. The FN was not available at the time and I felt the N would be close enough. The fuses were made by LittleFuse. They were purchased from Newark Electronics. Part number 64R8010.
Prior to acquiring the surface mount caps, I tested the inverter board by soldering a regular fuse across the blown fuse and putting the inverter back into the monitor. The monitor came back to life. Normally when there is a fuse blows, it is because there is a short someplace down stream. How ever the new fuses have held. Therefor I am assuming it was just faulty fuses.
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9 Answers

There is power but no display

Your symptom is commonly caused by failure if the inverter circuit. It is made by Sampo. The inverter powers the backlights. Replacing the inverter is the first step to resolve the problem.

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