Question about BenQ FP731 17" LCD Monitor

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Benq FP91G+ 19" LCD. Green power light briefly flashes on and off, but the screen doesn't come on. What could be the problem?

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If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses; poor solder joints, 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 DELL (BenQ makes DELL monitors) 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

Replacement board:
http://www.lcdrepair.us

Posted on Jul 11, 2010

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Monitor suddenly went black.If on/off button pushed screensaver briefly flashes on but then back to black screen.Green power light is on but nothing on screen when using computer


Hi,

Try to replace all bad capacitor on power inverter board and turn it on. Hope it will work perfectly.

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Power leak causing overload on the O/L sensor.

Probably a faulty capacitor on the power board

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Check to see if the video cable is connected at both ends securely.
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Hey... friend,

It's seems your backlight inverter is burnt out...need to replaced a new inverter. Visit this site @ www.3rd-rocks.com There's a replacement parts for your FP988D LCD. Have a nice day!

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Hi,

The description "comes on very faint" is indicative that the backlight is not turning on. The backlight as the name implies provide the illumination of the rear panel of the LCD display. It is made on 1 or more CCF Lamps (cold cathode florescent lamps) and are powered by an inverter that provides the high frequency high voltage needed for the CCF lamps to work. Since the entire screen is dark and it is highly unlikely that both or all the lamps would go out at the same time, it would highly be likely that the inverter is the culprit being the common denominator to all the lamps.

Should you venture to perform a DIY (do-it-yourself) (with the necessary precautions and safety in mind), look for a board that would have small transformers and have connectors that leads to the CCFLs. They often go bad because of dried up/blistered capacitors, cold solder or a general failure in the electronics.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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Small text and Icons


sir
sheza

i think you r installed any lan card ar etc. when you had taken com thing from the shop he will geve garenti for minimum one weak. for each component they geve a instaltion cd please instal. and see the system requiredments and proseed to ti ok

Mar 25, 2008 | BenQ FP91G+ 19" LCD Monitor

1 Answer

Veiwsonic 924x


This is a generic symptom that could happen to any LCD monitor.
The following is a generic answer applicable to most.

The most possible causes are bad capacitors or a bad semi-conductor.

Open the unit and check to see if any of the capacitors in the power supply or other boards look domed or vented on the top.

Replace any capacitors accordingly. Use the same value capacitors. Most often, 1000uF 16V or 25V, 470uF at 16 or 25V, 220uF at 16V or 25V.

If this doesn’t solve the problem, try checking the surface-mount transistors on the inverter board that run the lights. Some times these transistors go bad and can cause the power to cycle up and down. Check the area for any cracked or overheated ceramic or mylar capacitors.

Don’t forget to check for caps on the main board. Some times these boards are overly simple and only have a couple of caps, but other times they are teaming with them.

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