This time we will repairing an Optiquest Q19wb 19″ LCD monitor with no power. This same power supply issue can cause your monitor to have a white screen, no display and a blinking power light or a unit that is slow to show a picture. This article will guide you through the repair of this unit. The power supply board is the ILPI-025.To do the repair you will need the following tools: Soldering iron, de-solder braid, Phillips screwdriver, flat blade screwdriver. You will also need the following electronic parts: qty(1) 1000uf 25v capacitor, qty(2) 470uf 25v capacitors, qty(1) 1000uf 10v capacitor and qty(3) 47uf 50v capacitors. We sell a repair kit with all of the parts for $12.00 This is not guaranteed to solve all problems but in most cases this is the issue with this model.

If you don’t want to do the repair yourself, then please use the service request link above to setup service on the unit.

Here is our repair subject.

The first thing to do is remove the power and signal cables from the unit.

No you will need to remove the monitor stand. The base can be removed and then you can get to the 3 screws inside the upright portion. Once they are removed and you can see the hinge then remove the 2 screws shown circled here.

No you can separate the front and back halves of the case. There are plastic catches around all four sides of the monitor that will need to be released. Use the small metal screwdriver and insert it between the two halves and apply a little pressure and they should start releasing. Now just work your way around the monitor until they are all free.

Lift off the front case of the monitor as seen below. The yellow circles show the next set of latches that will need to be released. These latches hold the LCD panel and electronics in the back portion of the case. Again use the flat blade screwdrivers to release the catches. As each one is release you will need to slightly lift the whole metal enclosure out until all are released and you can remove the assemble.

The next step to do is remove the signal cable from the control board as seen below. Be very careful with this cable if it gets torn or damaged then you not have a very big paper weight.

With the signal cable removed you can now turn the unit over face down and remove the backlight wires. The two picture below show the unit and a closeup of the backlight poer wires. When you reassemble the unit the order of the wires does not make a difference but be sure they are good and tight in the sockets.

Here we see the power and control boards. Remove the 5 screws as seen circled in the picture. You will also need to unplug the power cable shown circled in red.

With the power board removed we can now get down to the actual soldering and repair work. The parts you will be replacing are shown circled below. The values are as follows:
C813 1000uf 25v capacitor
C501 and C817 470uf 25v capacitors
C818 1000uf 10v capacitor
and finally C820, C827 and C807 47uf 50v capacitors.

When installing the new capacitors be sure to insert then into the board with the correct polarity. There is a stripe on the side of the capacitors, just make sure the new cap has the stripe going the same direction as the old one came out.

Now just reassemble the unit and test. If everything went well you should now have a working monitor again. If you have any questions about this repair just use the comments section below, we will be glad to help.

7 Comments on How to repair a Optiquest Q19WB monitor

idilio ferreira on Wed, 14th Apr 2010 8:40 am


Sorry not to comment on the repair, the entire procedure is correct, I am a repair Acer al1916w, a problem with equal power, with Q804, D802, IC802 burned already searched the internet plan and not found, was when I saw this repair on your site and I was glad to think to solve my problem of reference of the IC802, I apologize but I do not know English, I am alive Portuguese Portugal
but I found this great site is well built and good to see
Thank you for attention, I’ll be a good site visitor,

Ferreira

黑帽seo on Wed, 12th May 2010 1:26 pm


Great article Thank

you so much!

Gilberto on Fri, 21st May 2010 12:17 pm


muchas gracias lo vere a detalle.

BoowartettE on Sat, 29th May 2010 8:29 am


Just want to say what a great blog you got here!
I’ve been around for quite a lot of time, but finally decided to show my appreciation of your work!

Thumbs up, and keep it going!

Cheers
Christian, iwspo.net

Joe on Wed, 21st Jul 2010 11:09 am


Thanks for this overview. It really helped me get the monitor apart. My only problem is that the caps on my board look fine but the monitor won’t power on at all, no flickering light, nothing.

CCL_TECH on Wed, 21st Jul 2010 12:21 pm


This model power supply board does fail with no visible parts damage. The most likely point of failure is the very small 47uf capacitors but while you have the unit open you should go ahead and replace the entire group of capacitors so you don’t have to reopen the unit again in a month or two.

RAY on Sun, 16th Oct 2011 6:38 am


Hey thanks for this , I had a dead monitor so tried this , ordered parts from America and fitted myself without much bother and now have my monitor as good as new…………cheers this was a great help.

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