Question about Sony SDM M81 18.1" LCD Monitor

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Past week or so, it would occasionally make a zapping sound and the display would flicker slightly. Dust inside maybe. Then yesterday, it required powercycling a few times at the cord in the morning (after it was off and computer slept). Each powercycle will show the display for a fraction of a second then it goes black again. Today, the same thing except the image never shows permanently. Just shows for a fraction of a second.

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That zapping sound can be coming fromt the lamp assembly or from bad inverter section, to verify if it is the lamp assembly or the inverter board, you will need spare lamps for testing. You can at least do the visual inspection inside the monitor first.
Bad lamps pictures:
http://s807.photobucket.com/albums/yy352/budm/Bad%20backlight%20lamp/

http://s807.photobucket.com/albums/yy352/budm/SONY/

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 pictures: 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 May 18, 2011

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