Question about Acer AL1715 (Black, Silver) 17" LCD Monitor

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Optiquest Q7B-3 Model Vs11147

The Lcd come on, stay on for 3-4 sec then gose blank

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  • Anonymous Nov 17, 2008

    I have

  • lotto-50 Nov 17, 2008

    I have the same problem. I found that the C5706 transistor on the back side of the board was shorted. I replaced the transistor, but it still does the same thing. The screen comes up and after 2 or 3 seconds it goes blank. The transistor didn't short out again and all the caps check good in the circuit. Any other suggestions that I could try?

  • Anonymous Dec 11, 2008

    Did anyone solve this. I have the same problem and was told to try and replace the Flourescent starter. I haven't done anything yet.

  • tinkerbell22 Feb 16, 2009

    Me Too! Optiquest Q7 Monitor is now flicking and does go blank. I just keep turning is off and on, over and over again, finally it will go on (maybe after it warms up? I have no idea! Been doing this for about a week now. Very frustrating! Had this monitor less than 2 years!

    Will not purchase again!

  • dexlerds Apr 08, 2009

    I have the same problem. Two of the C5706 are visibly burnt. Did you replace all four(two on ea. side), or just the one? Also where did you buy them? I am having trouble finding any.

  • Anonymous Apr 16, 2009

    Where is the best place to get the inverter????? Thanks!!!!!

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Caps on power sup low volt high cap.turns on yhen shuts off.check caps first..

Posted on Nov 15, 2008

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Hi...there,
YEah...you've got a busted backlight inverter. Need to get a new one or repaired it...

Posted on Oct 25, 2008

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SOURCE: Optiquest Q7B-3 Model Vs11147

Actually that model has an integrated inverter with the power supply. Should be part # xlm1700390004 they cost around 25 bux and are fairly easy to replace.

If you are handy with soldering you could check the three 470 uf caps on the board they are tank caps and when they go they do what you are describing. Open the monitor and look at the three black capacitors if the top is bulged they are bad. If you have a capacitance meter check the capacitance it will most likly be well below 470 uf the caps are cheap like 39 cents if you do go this route use 30v not 25v caps to be on the safe side.

Word of warning switching power supplies can kill you quickly never work on it live and let it discharge at least an hour before working on it.

Posted on Jan 06, 2009

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1 Answer

Viewsonic Optiquest Q19wb lcd Monitor goes blank after 2 secs. A couple of posts say replace the 1000uf 16v Cap My problem is i can't find them on the pcb (where are they?)


Look at the board where the AC power connector comes in that is the power supply board, there are more than one versions so it nay not have the same caps value.
Most common failures 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). You will need to open it up and inspect the inside, see example of failed Viewsonic/Optiquest monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague

http://www.badcaps.net

Post pictures or send them to me budmrtn@aol.com

May 15, 2010 | ViewSonic Optiquest Q19wb LCD Monitor

1 Answer

ViewSonic Optiquest Q7b 17" LCD Monitor has a fuzzy picture


LCD monitor needs to be fed with native resolution from the PC video out, this monitor native resolution is 1280x1024 @60Hz, try that setting to see if it helps before opening up the monitor to look for failed components.

Mar 29, 2010 | ViewSonic Optiquest Q7b Flat panel TFT 17"...

3 Answers

ViewSonic Optiquest Q19wb LCD Monitor goes blank after 2 secs. A couple of posts say replace the 1000uf 16v Cap, My problem is i can't find them on the pcb (where are they?)


sgcb1971, There are lots of pics on web for you to view and then you will know what to look for. Electrolytic filter capacitors are not to hard to spot on a "switch-mode-power-supply"/"ccfl inverter supply" combo board. Why don't you visit YOUTUBE for some video clips of "lcd monitor disassembly" and "lcd monitor repair" . Also try www.ccl-la.com/badcaps.htm for more clues as to just what to look for. Ya know , you need a soldering iron to replace them if they are bad!!! It's not like changing batteries in a flashlight 12fixlouie

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1 Answer

Optiquest monitor screen turned bright pink. How to solve this issue?


First check your cord from the computer to the monitor to make sure the connections are clean and good on the blue vga cord. Plugging it in and out a few times will help clean the pins and holes.
If that is ok: then it may be bulbs.
Pink means that you have bad bulbs inside the screen. sometimes the pink goes away when the bulbs warm up. eventually it won't stay on.
There is a slight chance the power board is also getting weak. You would have to open it up to tell this.
Once partially opened, Disconnect the wide set of wire that goes from the back of the screen to the monitors main video board and then try to turn it on, If it is still bulbs they will really show up with this setup.
If you send me a picture of the power board to bammbamm@ptd.net, I may be able to tell if the board has issues by looking at the picture of it.
Fran

Dec 13, 2009 | ViewSonic Optiquest Q7b Flat panel TFT 17"...

4 Answers

Viewsonic Optiquest Q19 blanks out - just a year old


Sounds like the LCD panel inverter is going out, if not gone out completely.

Jul 18, 2009 | ViewSonic Optiquest Q19wb LCD Monitor

1 Answer

Blank screen


probably failure in the LCD controller IC in the lcd controller board. that no signal was sent out to the lcd driver IC thus you could only see white display. A replacement of LCD panel is the best solution. I suggest to bring the unit to an authorized service center to properly diagnose & fix the problem. regards

May 21, 2009 | ViewSonic OptiQuest Monitor

3 Answers

Flickers continuously


From what I have heard the isn't a great monitor and most say stay away. Sorry for the advice. There is one thing I would try, to increase the Hertz from 60 to at least 70...here is how: right click in an open area on your desktop...a box opens...->PROPERTIES->SETTINGS TAB->ADVANCE->MONITOR TAB-MONITOR SETTINGS there you'll see a drop down arrow->click on it a select 70HERTz ->APPLY-> OK...just for good measure, reboot...that may help..if not try the link below for more help Good luck...
http://www.viewsonic.com/products/lcddisplays/optiquest/q7b/

Apr 23, 2009 | Computers & Internet

1 Answer

Monitor not working


You can check the date of manufacture on the back of the monitor. If the monitor is over a year old there is no warranty repair. It's possible to get it repaired locally you'll just need to find a repair shop.

Feb 17, 2009 | ViewSonic OptiQuest Monitor

1 Answer

View sonic Optiquest Q7B-3 comes on for a second then black


dantheman009,

Don't know if this will fix your problem, but my monitor did the same thing. If you look on the bottom of the power supply board, you will find Q305 and Q306. They are probably both shorted. I replaced both transistors and the capacitor C305 on the top of the same board. The capacitor was open. After I replaced the parts it is working again. Look with a magnifying glass and make sure there are no bad solder joints. The only place I could find the transistors were at www.bluestar-online.com. Make sure you order the 2SC5706. It is an exact replacement.

Good luck!
lotto-50

Dec 11, 2008 | ViewSonic Optiquest Q7b Flat panel TFT 17"...

2 Answers

Optiquest Q7B-3 Model Vs11147


Actually that model has an integrated inverter with the power supply. Should be part # xlm1700390004 they cost around 25 bux and are fairly easy to replace.

If you are handy with soldering you could check the three 470 uf caps on the board they are tank caps and when they go they do what you are describing. Open the monitor and look at the three black capacitors if the top is bulged they are bad. If you have a capacitance meter check the capacitance it will most likly be well below 470 uf the caps are cheap like 39 cents if you do go this route use 30v not 25v caps to be on the safe side.

Word of warning switching power supplies can kill you quickly never work on it live and let it discharge at least an hour before working on it.

Dec 11, 2008 | ViewSonic Optiquest Q7b Flat panel TFT 17"...

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