Question about BenQ T221W Monitor

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No screen display power light blinking - BenQ T221W Monitor

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  • 2 more comments 
  • rouxwl Dec 31, 2010

    Do i need a special tool to open the monitor?

  • rouxwl Jan 01, 2011

    Thx 4 your quick and well detailed reply.

    Yes i proved that the monitor is faulty by using a second pc and cable's

    I struggled a bit to get the cover open but did mange to not damage it to much ;-)

    I've found a cap(buldging) that could be the cause and will post images when i get the time

  • rouxwl Jan 02, 2011

    Found the boardhttp://i219.photobucket.com/albums/cc58/... with the same layout, only components missing is the ones in the yellow sqaure (Think it could be for the sound)

  • rouxwl Jan 02, 2011

    The buldging cap (1000?F 10V) is the big one in the front of the red sqaure

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  • Master
  • 11,361 Answers

It does the same with another PC?
More likely to have components failure inside such as caps, transistors, cold solder joints.
BenQ makes monitor for DELL so it may have the same board inside as shown in my DELL albums.
If you are going to DIY and already try the monitor with another PC, 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 (they should be replaced in a set), 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 monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Posted on Jan 01, 2011

Testimonial: "Thank you for your EXPERT reply and i'm sure with your assistance i would be able to get this monitor DIY'ed ;-)"

  • 5 more comments 
  • Bud Martin
    Bud Martin Jan 01, 2011

    Please make sure to replace them in a set, post pictures of the board so I can tell you which one. Do not use RADIO SHACK caps, they are not low ESR type.

  • rouxwl Jan 02, 2011

    Found the boardhttp://i219.photobucket.com/albums/cc58/... with the same layout, only components missing is the ones in the yellow sqaure (Think it could be for the sound)

  • rouxwl Jan 02, 2011

    Found the boardhttp://i219.photobucket.com/albums/cc58/... with the same layout, only components missing is the ones in the yellow sqaure (Think it could be for the sound)

  • Bud Martin
    Bud Martin Jan 05, 2011

    Replace all 4 electrolytic caps on the left side of the board at the same time., make sure to use good caps with low ESR and 105C rating.

  • rouxwl Jan 07, 2011

    Replaced buldging radial electrolitic capacitor (1000 Mikro Farad 10 Volt).....0.163748 USD

    Monitor working like a charm!!!!!!

    Thank you again for your help

  • rouxwl Jan 07, 2011

    "http://i219.photobucket.com/albums/cc58/rouxwl/79090140.jpg" The cap which the arrow is pointing at

  • Bud Martin
    Bud Martin Jan 07, 2011

    That 10vdc cap is for the 5vdc logic power supply, I would change the other one also, the circuits is like this: the rectifier diode will feed the first cap and then throunh an inductor (the inductor helps filtering out the swithcing frequency) there will be anoher cap, it is Phi filter setup, same for the power supply section for the backlight inverter circuits, that is why it is important not to replace just one bad cap, it will have at least two caps in each power supply.

    Cheers,

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